WO2009151041A1 - 磁気共鳴イメージング装置および撮影パラメータ設定支援方法 - Google Patents
磁気共鳴イメージング装置および撮影パラメータ設定支援方法 Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
Definitions
- the present invention relates to a multi-station imaging technique for performing imaging by step movement in a magnetic resonance imaging apparatus.
- the present invention relates to a parameter setting support technique in multi-station shooting.
- a magnetic resonance imaging (MRI) apparatus measures a nuclear magnetic resonance (hereinafter referred to as “NMR”) signal from protons in a subject, and images (captures) the proton density distribution, relaxation time distribution, and the like.
- NMR nuclear magnetic resonance
- whole body imaging whole body MRI
- a bed on which a subject is placed is repeatedly moved to take a whole body MRI image of the subject (hereinafter referred to as a whole body image) and performs a screening test or the like has been attracting attention.
- multi-station imaging in which the bed is moved step by step to obtain a whole body image, the subject is divided into multiple stations (imaging areas) as the bed moves, and the resulting images are combined to create a whole body image. create. While the image of each station is being shot, the bed is stopped and the bed is moved between the shots.
- imaging may be performed using multiple imaging sequences such as T1-weighted, T2-weighted, and diffusion-weighted (multi-station / multi-sequence). Shooting).
- the present invention has been made in view of the above circumstances, and an object of the present invention is to improve the usability of parameter check when changing shooting parameters in multi-station shooting and to obtain a desired image easily and with high quality.
- imaging management means for managing imaging performed in each station of the multi-station imaging, and for each imaging managed by the imaging management unit
- An input unit that receives an input of a shooting parameter value used for the shooting, and for each shooting in which a new shooting parameter value is input via the input unit, whether the input new shooting parameter value is appropriate or not is the multi-station.
- a shooting availability determination unit that determines before shooting starts and a shooting parameter value that is determined to be inappropriate by the shooting availability determination unit include information that can identify the shooting and the shooting parameter value that is determined to be inappropriate
- a magnetic resonance imaging apparatus characterized by comprising: To.
- a shooting specifying step for specifying a shooting in which shooting parameter values are newly input from all shootings performed in station shooting, and a newly input shooting parameter value for each shooting specified in the shooting specifying step In the shooting availability determination step for determining whether or not the camera is appropriate, and in the shooting availability determination step, for the shooting with the shooting parameter value determined to be inappropriate, the information that can specify the shooting and the shooting parameter value determined to be inappropriate are errors.
- the usability of parameter check when changing shooting parameters is improved, and a desired image can be obtained easily and with high quality.
- FIG. 1 is a functional configuration diagram of a magnetic resonance imaging (MRI) apparatus 100 of the present embodiment.
- a magnetic resonance imaging apparatus 100 of the present embodiment includes a bed 112 on which a subject 101 is placed, a magnet 102 that generates a static magnetic field, a gradient magnetic field coil 103 that generates a gradient magnetic field in the space, An RF transmitter coil 104 that generates a high-frequency magnetic field in this region, an RF receiver coil 105 that receives a nuclear magnetic resonance (MR) signal generated by the subject 101, and a signal that detects an MR signal detected by the RF receiver coil 105 Inclined local power source that sends a current for driving the gradient magnetic field coil 103 and a signal processing unit 107 that processes the MR signal detected by the detection unit 106, the signal detection unit 106, controls the entire MRI apparatus 100, and performs various information processing 109, an RF transmission unit 110 that transmits a signal for generating a high-frequency magnetic field in the RF transmission coil 104,
- the gradient magnetic field coil 103 is composed of gradient magnetic field coils in three directions of x, y, and z.
- a current is supplied from the gradient magnetic field power source 109 to the gradient magnetic field coil 103, and gradient magnetic fields orthogonal to each other are generated.
- a slice selection gradient magnetic field, a phase encoding gradient magnetic field, and a read gradient magnetic field are set in arbitrary directions, and position information is given to each MR signal.
- the bed driving unit 113 controls at least the movement of the bed 112 in the body axis direction (z direction) in accordance with a control signal given from the control unit 111.
- the MRI apparatus 100 performs multi-station / multi-sequence imaging in which each station of multi-station imaging performs multiple imaging.
- the signal processing unit 107 of the present embodiment includes a sequence management unit, an imaging unit, an image reconstruction unit, and a parameter check unit.
- the sequence management unit manages the shooting sequence (Job) executed in one multi-station / multi-sequence shooting in the sequence management table.
- a Job group for each station is referred to as a Task
- a Job group for all Tasks that is, an entire Job group that is executed in one multi-station / multi-sequence shooting is referred to as inspection.
- the multi-station / multi-sequence shooting according to the present embodiment includes shooting in which images taken at the stations are combined to obtain one image in the moving direction of the bed 112.
- a Job group that combines the obtained images is called a group for each unit to be combined.
- Figure 2 shows the relationship between these jobs, tasks, and groups.
- the sequence management unit manages the task, the relationship between groups, and the type of shooting sequence to be used by assigning a job ID to each job group.
- FIG. 3 is an example of the sequence management table 300 of the present embodiment. As shown in this figure, the sequence management table 300 of this embodiment stores JobID 301, Task name 302, Group name 303, Job name 304, and shooting sequence type 305, respectively. The sequence management table 300 is stored in the storage unit 116.
- the imaging unit controls the control unit 111 for each job according to the inspection content managed by the sequence management unit, and executes imaging.
- commands and signals are sent to the control unit 111 to control the operations of the gradient magnetic field power supply 109, the RF transmission unit 110, and the signal detection unit 106, and each Job is executed.
- the set shooting parameters are used when executing Job.
- the imaging unit causes the control unit 111 to also control the bed driving unit 113, and moves the bed 112 by a predetermined distance in accordance with the execution of imaging.
- the image reconstruction unit performs processing such as FFT (Fast Fourier Transform) on the signal detected by the signal detection unit 106, and reconstructs an image using a known technique.
- FFT Fast Fourier Transform
- the images of each station obtained from the same group of Jobs are combined to obtain an image in a desired range such as the whole body.
- the parameter check unit determines whether the shooting parameters received from the user via the input unit 114 are appropriate, and performs a parameter check process for presenting the result to the user.
- the parameter check unit includes a shooting availability determination unit that determines whether or not the shooting parameters are appropriate from the viewpoint of whether or not shooting is possible, and a synthesis availability determination unit that determines whether or not the reconstructed image can be combined.
- the parameter check process is performed for all jobs whose shooting parameters have been changed before the start of multi-station / multi-sequence shooting when an instruction from the user is received or when preset shooting parameters are changed. Done.
- the determination of suitability by the combination determination unit is performed after the shooting determination unit determines that shooting is possible.
- Various types of data used for processing by the above functional units for example, various types of imaging sequences that can be performed by the MRI apparatus 100 of the present embodiment, the types of imaging parameters to be set in each imaging sequence, and the respective imaging parameters
- the allowable range is stored in the storage unit 116 in advance.
- a table that stores the allowable range of each imaging parameter for each imaging sequence is called a parameter management table.
- Various types of data generated during processing by each functional unit are also stored in the storage unit 116.
- the shooting parameter values for each Job are managed in association with JobID301.
- the value of each shooting parameter before the change is referred to as an initial value
- the value of the shooting parameter input as a change from the user is referred to as a change value.
- a value group in which a change value input is replaced with a change value is referred to as a change value set.
- the changed value set is input and then stored in a temporary file in the storage unit 116. After the following parameter check process, the changed value set is replaced with an initial value in response to an instruction from the user.
- the photographing unit performs photographing using the initial value.
- FIG. 4 is a process flow of the parameter check process of this embodiment.
- the process is started when an instruction to change the shooting parameter is received from the user. Note that, as described above, this process may be configured to start upon receipt of an instruction to start the parameter check process from the user.
- the user inputs the shooting parameter to be changed and the change value thereof together with the job for changing the shooting parameter via the input unit 114, and when the input of the change value of the desired shooting parameter of the desired job is completed, the user instructs to change the shooting parameter.
- the shooting availability determination unit performs a shooting availability determination process for determining whether shooting is possible with the received change value (step S210).
- the shooting availability determination unit inquires the sequence management unit, extracts a group of jobs whose shooting parameters have been changed, and determines whether or not shooting is possible for each job. ) Process is performed (step S211).
- the photographing permission / inhibition PC process it is determined whether or not the change value is within a predetermined range (step S212). If there are shooting parameters that are out of range, an error occurs.
- the photographing availability determination unit When there is an error, the photographing availability determination unit performs error display processing (step S213), disallows photographing, displays that fact to the user (step S214), and ends the parameter check processing.
- the instruction to prohibit photographing is realized by using, for example, a photographing non-permission flag.
- step S212 it notifies the composition availability judgment unit that the photographing availability judgment processing has been completed.
- the composition availability determination unit Upon receipt of the notification from the photographing availability determination unit, the composition availability determination unit performs a composition availability determination process (step S220).
- a composition availability determination process In the compositability determination process, a common value determination process (step S221) for determining whether or not a predetermined shooting parameter has the same value in a predetermined job, and a job in a group in multi-slice shooting or the like.
- Slice consistency determination process (step S222) that determines whether there is slice consistency between the two, and whether there is an overlap (OL) amount that can be combined in the images between the stations that are to be combined OL amount determination processing (step S223) is performed.
- step S224 if there is no error and a compositeable result is obtained (step S224), an end display is performed (step S225), and the parameter check process is terminated.
- the composition availability determination unit displays a screen for accepting a final instruction that there is no error and replaces the initial value with the changed value. In this case, only the process of replacing the initial value with the changed value may be performed without displaying the end.
- step S224 if it is determined in step S224 that any of the processes cannot be combined, an error is displayed (step S226), and the parameter check process is terminated.
- the composition permission / inhibition determining unit of the present embodiment permits photographing even when there is an error.
- the compositability determination unit displays a screen that accepts an instruction as to whether an error has occurred in which process, whether to replace the initial value with the changed value, or cancel the change and keep the initial value. To do.
- the processing order of the common value determination process, the slice consistency determination process, and the OL amount determination process is not limited.
- FIG. 5 is a photographing permission / inhibition PC process (step S211) by the photographing permission / inhibition determining unit of the present embodiment.
- the photographing availability determination unit inquires the sequence management unit and extracts the JobID 301 of the Job group including the changed photographing parameter (step S2111). Count the number of Jobs whose shooting parameters have been changed. Here, m is set (step S2112). Then, a checklist is created by associating the extracted JobID with the changed shooting parameter (type and its changed value) for each Job in descending order of numbers from m to 1 (step S2113). In the subsequent processing, they are called the mth, m-1st ... first job, respectively. Next, the job number m is stored in the error counter e (step S2114).
- the shooting process determination unit extracts the shooting sequence from the sequence management table 300 and the changed shooting parameter allowable range from the parameter management table for the m-th job in the check list (step S2115). Then, it is determined whether or not the change value of the shooting parameter is within the permissible range (step S2116). If there is something outside the allowable range, there is an error, and if all are within the allowable range, there is no error.
- step S2117 If there is an error (step S2117), the shooting parameter in error is stored in the check list (step S2118), and the process proceeds to step S2121.
- step S2117 by replacing the shooting parameters of the data to be determined in the check list with only the shooting parameters in error, the shooting parameters in error are stored in the check list.
- step S2119 the job data to be determined is deleted from the check list from the check list (step S2119). Further, the error counter e is decremented by 1 (step S2120), and the process proceeds to step S2121.
- the photographing permission / inhibition determining unit determines whether or not there is an error in step S212.
- the determination may be made based on whether data remains in the check list without using the error counter e. In this case, if data remains in the checklist, it is determined that there is an error, and if there is no data, it is determined that there is no error.
- FIG. 6 is a processing flow of error display processing (step S213).
- the photographing availability determination unit reads the check list (step S2131), extracts the task name and job name of each data on the list from the job ID from the sequence management table, generates an error display screen, and displays it on the display unit 115 (Step S2132).
- the error display screen of this embodiment includes a first error display screen 500 that displays which job has an error, and a second error display that displays the shooting parameters in which each job has an error. Screen 510.
- the first error display screen 700 includes a Task name display area 701, a Job name display area 702, and a message display area 703. indicate.
- the job name display area 702 also serves as an area for receiving an instruction for specifying a job to be displayed as the second error display screen. That is, the user can specify a job to be displayed as the second error display screen 710 by instructing the job name displayed in the job name display area 702 by an operation such as clicking.
- the first error display screen 700 may be configured to display the shooting sequence type used in the Job in addition to the Job name.
- the message display area 703 displays, for example, that the shooting parameter is out of the allowable range in the above-mentioned job, and that detailed information can be obtained by clicking the job name.
- the shooting availability determination unit When receiving an instruction for specifying a job from the user, the shooting availability determination unit reads out the shooting parameter of the job in error from the check list and displays the second error display screen 710 (step S2133).
- FIG. 7B is an example of the second error display screen 710.
- the second error display screen 710 includes an area 711 for displaying information (Task name and Job name) for identifying the job, an area 712 for displaying the type of the shooting parameter in error, and the first error display screen 700.
- a cancel button 713 for accepting an instruction to return to From this display, the user can know the imaging parameter in error, and can determine the subsequent processing.
- step S221 common value determination process
- step S222 slice consistency determination process
- step S223 OL amount determination process
- step S220 composition possibility determination process
- FIG. 8 is a process flow of the common value determination process (step S221) by the synthesis process determination unit of the present embodiment.
- the shooting parameters that should have the same value are extracted between Jobs in 1 Task, between Jobs in 1 group, and between all Jobs in all Tasks, and these values are the same. Is checked (step S2211).
- the shooting parameter types that should have the same value among Jobs in 1 Task are FOV, rectangular ratio, phase encoding direction, bed position, receiving coil, receiving coil mode, and the like.
- the shooting parameters that should be the same value among Jobs in one group are a slice plane (imaging step plane), an oblique angle, and the like.
- the shooting parameter types that should be the same are stored in the storage device 116 in advance.
- step S2212 if there is a value that is not the same in these shooting parameter types, it is determined that there is an error (step S2212). At this time, the shooting parameter in error and the JobID of the Job group in the range where the shooting parameter should be the same are recorded in the common value error display list (step S2213). On the other hand, if there is no error, the process ends, and the process proceeds to a slice consistency determination process (step S222).
- FIG. 9 is a processing flow of slice consistency determination processing (step S222).
- the composition availability determination unit first determines whether or not a shooting sequence whose slice consistency should be determined is included (step S2221). For example, when each job is only for shooting on the axial plane, slice consistency processing is not necessary. In this case, the process ends.
- the necessity condition is stored in the storage unit 116 in advance.
- the slice consistency is checked (step S2222).
- the change value set the consistency between the slice interval and the number of slices (or slice thickness) in the shooting parameters is confirmed between jobs in each group. That is, even if both are the same or different, it is determined whether or not the difference is within the allowable range (step S2224). Then, the process proceeds to the OL amount determination process (step S223).
- the process proceeds to the OL amount determination process (step S223).
- it is determined that there is an inconsistency an error is determined, and the job ID belonging to the inconsistent group is added to the slice consistency error display list (step S2225), and then the process proceeds to the OL amount determination process (step S223).
- FIG. 10 is a process flow of the OL amount determination process (step S223).
- the compositability determination unit determines whether the OL amount of the reconstructed image of the adjacent station is within a compositable range for each group.
- the detailed procedure for determination is as follows.
- the imaging area size hfFOV (imaging area in the body axis direction of each station) of each station is calculated (step S2231).
- the calculation method of hfFOV differs depending on the cross section.
- the imaging section is a coronal section or a sagittal section, it is calculated by a different formula depending on the phase encoding direction.
- the phase encoding direction is the body axis direction, it is calculated by the following equation (1).
- phase encoding direction is a direction perpendicular to the body axis, it is calculated by the following equation (2).
- FIG. 11 is a diagram for explaining the OL amount calculation between adjacent stations.
- the OL amount is calculated from hfFOV and the station position.
- the station position is the bed position (signed coordinate indicating the center of the FOV in the body axis direction) of each station.
- the bed position is one of the shooting parameters as described above.
- the station position (bed position) is described as OC. If two adjacent stations are ST i and ST i + 1, and hfFOV and OC of each station ST i and ST i + 1 are hfFOV i , hfFOV i + 1 , OC i , and OC i + 1 , OL is expressed by the following equation (4) Is calculated by OC i and OC i + 1 are signed values.
- dOL Min (hfFOV i + hfFOV i + 1 ) / 2 + OC i -OC i + 1 (4)
- dOL Min is determined as the minimum OL amount
- dOL Max is determined as the maximum OL amount in consideration of the image quality of the composite image and the inspection time.
- dOL Min is the minimum amount of OL required to guarantee a certain level of image quality
- dOL Max has a larger demerit that the inspection time is longer than the advantage of improved image quality. It is the amount of OL judged to be.
- dOL Min and dOL Max are determined in advance and stored in the storage unit 116.
- the OL amount between adjacent stations is within the recommended range, it is determined that the OL amount is appropriate, and the OL amount determination process is terminated. On the other hand, if there is an OL amount that is out of the recommended range, the JobID of the adjacent job of the corresponding group is added to the OL amount error display list (step S2234), and the OL amount determination process is terminated.
- the above-described parameter check process is performed, and whether or not it is appropriate is collectively determined before starting shooting.
- the determination of suitability is first made from the viewpoint of whether or not shooting is possible, and when it is determined that shooting is possible, it is next determined from the viewpoint of whether or not composition is possible.
- the user can recognize an inappropriate photographing parameter by looking at the display and change the value again.
- the shooting parameters are changed is collectively determined before the shooting is started. Therefore, it is easy to determine whether or not shooting is possible after changing the shooting parameters. Further, since shooting is not executed until a shooting parameter capable of shooting is set, useless shooting that causes an error is not performed.
- whether or not shooting is possible and whether or not combining is possible are determined separately, and further, whether or not combining is possible is performed only when it is determined that shooting is possible, so there is no waste.
- the signal processing unit 107 in the MRI apparatus 100 is configured to perform the parameter check process.
- the parameter check process of the present embodiment may be performed in an information processing apparatus independent of the MRI apparatus 100 and capable of transmitting and receiving data to and from the MRI apparatus 100.
- various data necessary for the parameter check process may be stored in the storage unit 116 of the MRI apparatus 100 as in the above embodiment, or may be stored in a storage device provided in the information processing apparatus.
- an instruction to further change the shooting parameter an instruction to return all the shooting parameters of the displayed Job to the values before the change, etc. You may make it display the structure which accepts.
- an instruction to return the shooting parameters of all jobs including the shooting parameters in error to the values before the change and / or the shooting parameters of all jobs to the values before the change. You may display the structure which receives the instruction
- the MRI apparatus of this embodiment is basically the same as that of the first embodiment.
- the photographing availability determination unit in the parameter check unit displays that there is an error and prompts the user to make a change.
- the recommended shooting parameter value is presented to the user as a suggestion, and the suggestion can be selected.
- the present embodiment will be described focusing on the configuration different from the first embodiment.
- FIG. 12 is a process flow of the parameter check process of the present embodiment. In this case as well, the processing is started when an input of a change of the imaging parameter is received from the user.
- steps having the same processes as those in the first embodiment are denoted by the same reference numerals.
- the shooting availability determination unit When receiving an instruction to change the shooting parameter via the input unit 114, the shooting availability determination unit performs a shooting availability determination process for determining whether shooting is possible with the received change value (step S210a).
- the shooting availability determination unit inquires the sequence management unit, extracts a group of jobs whose shooting parameters have been changed, and determines whether or not shooting is possible for each job. ) Process is performed (step S211a). In the shooting permission / prohibition PC processing of this embodiment, it is determined whether or not the change value is within a predetermined range. If there is a shooting parameter that is out of the change value, an error is generated and a suggestion is provided as a recommended value. calculate.
- the photographing availability determination unit When there is an error (step S212), the photographing availability determination unit performs error / suggestion display selection processing for displaying a suggestion and an error (step S213a), and then selects a suggestion or the like from the user via the input unit 114. Accept. For all shooting parameters in error, it is determined whether changes to suggestions, etc. have been accepted, i.e., whether the errors have been resolved (step S215). The determination process is terminated, and the process proceeds to the composition possibility determination process. The composition possibility determination process after the transfer is the same as in the first embodiment.
- step S214 the fact is displayed (step S214), and the parameter check process is terminated.
- step S211a details of the photographing permission / inhibition PC process (step S211a) and the error / suggestion display selection process (step S213a), which are processes different from the first embodiment, will be described.
- FIG. 13 is a processing flow of the photographing permission / inhibition PC processing of the present embodiment. This is basically the same as the photographing permission / inhibition PC processing of the first embodiment.
- the present embodiment includes a suggestion calculation process (step S2123) for calculating a suggestion as a recommended value when the changed shooting parameter is outside the allowable range.
- a suggestion is stored in the check list in association with the shooting parameter in error (step S2124).
- the photographing availability determination unit calculates, as a suggestion, a value closest to the change value input by the user within the photographing parameter allowable range.
- Other processing is the same as the processing of the same sign in the first embodiment.
- FIG. 14 is a processing flow of the error / suggestion display selection processing of this embodiment.
- the photographing availability determination unit first checks the presence / absence of data in the check list (step S1401). This is because, in this embodiment, when the recommended value displayed as a suggestion is changed, the value is deleted from the check list. If there is no data, the error / suggestion display selection process is terminated.
- the shooting availability determination unit reads the checklist (step S1402), extracts the task name and job name of each data on the list from the sequence management table from the JobID, and displays the first error / suggestion display A screen 1500 is generated and displayed on the display unit 115 (step S1403).
- An example of the displayed first screen error / suggestion display screen 1500 is shown in FIG.
- the first screen error / suggestion display screen 1500 is basically the same as the first error display screen 700 of the first embodiment, and includes a task name display area 1501, a job name display area 1502, a message display area 1503, Is provided.
- the first error / suggestion display screen 1500 of this embodiment further includes an end button 1504 for receiving an end instruction.
- the photographing availability determination unit ends the error / suggestion display selection process.
- the type of shooting parameter in error for the job is read from the check list and displayed (step S1405).
- a suggestion is also read and displayed.
- FIG. 15B shows an example of the second screen error / suggestion display screen 1510 displayed at this time.
- the second error / suggestion display screen 1510 of the present embodiment includes an area 1511 for displaying information for specifying a job, an area 1512 for displaying an imaging parameter in error, and each imaging parameter.
- Area 1513 for displaying the suggestions change instruction reception area 1514 for receiving an instruction to change to the recommended value displayed as a suggestion, or to return to the value before change (initial value), and an instruction for confirming the selection
- a confirmation instruction receiving area 1515 In the confirmation instruction reception area 1515, an OK button for receiving an instruction to change to the value specified via the change instruction reception area 1514 and a cancel button for receiving an instruction to return to the first error / suggestion display screen are displayed. .
- the user can know the shooting parameter that is in error and the recommended value suggestion by viewing the display on the second error / suggestion display screen 1510. Then, by giving an instruction via the change instruction receiving area 1514, it is possible to instruct for each shooting parameter whether to change to a suggestion or return to a value before the change.
- the imaging availability determination unit receives an instruction to change or return to the first error / suggestion display screen 1500 via the confirmation instruction reception display area 1515.
- the shooting availability determination unit changes the change value of the shooting parameter of the job according to the instruction (step S1407).
- the job is deleted from the check list (step S1408).
- the error counter e is incremented by 1 (step S1409), and the process returns to step S1401.
- step S2-5 whether or not the error is resolved (step S215) is determined based on the presence / absence of data in the checklist or the value of the error counter e. That is, if there is no data in the check list or if the value of the error counter e is 0, it is determined that the error has been resolved, and otherwise, it is determined that the error has not been resolved.
- the user can obtain a recommended value within an allowable range for an imaging parameter that is in error.
- a value within the allowable range can be easily set. Accordingly, in addition to the effects obtained in the first embodiment, it is possible to easily and reliably set shooting parameters that allow shooting even when the shooting parameters are changed.
- the second error / suggestion display screen 1510 may display a configuration for receiving an instruction to further change each imaging parameter that has caused an error. Furthermore, on the first error display screen 1500, a configuration is displayed that accepts an instruction to return all shooting parameters in error to the values before the change and / or an instruction to return all shooting parameters to the values before the change. Also good.
- the configuration is such that the job suggestion indicated by the user is displayed for the shooting parameter in error, but the present invention is not limited to this.
- the error / suggestion display selection processing it may be configured to display all of the shooting parameters that have been read from the check list and in error for each task and job together with the suggestion.
- the shooting in error Configure instead of the step (Step S1403) of displaying the job using the shooting parameter in error and the step of displaying the shooting parameter in error of the specified job (Step S1405), the shooting in error Configure to display all parameters along with suggestions.
- step S2123 After checking the suitability of shooting parameters for all jobs, error / suggestion display processing is not performed, but when a suggestion is calculated in the shooting permission / inhibition PC processing (step S2123), it is displayed at the same time as being stored in the checklist. It may be configured to obtain an instruction from the user.
- FIG. 16 is a processing flow of parameter check processing according to this embodiment. Here, it is assumed that the processing is started when an input of a change of the imaging parameter is received from the user.
- the same reference numerals are given to the same processes as those in the second embodiment.
- the imaging availability determination unit When accepting the change of the imaging parameter via the input unit 114, the imaging availability determination unit performs an imaging availability determination process for determining whether or not imaging is possible with the received change value (step S210b).
- the shooting availability determination unit inquires the sequence management unit, extracts a group of jobs whose shooting parameters have been changed, and determines whether or not shooting is possible for each job. ) Process is performed (step S211a).
- the shooting permission / prohibition PC processing of this embodiment it is determined whether or not the change value is within a predetermined range. If there is a shooting parameter that is out of the change value, an error is generated and a suggestion is provided as a recommended value. calculate.
- step S212 the shooting availability determination unit performs error / suggestion replacement processing to replace the changed value of the shooting parameter that caused the error with the recommended value calculated as a suggestion (step S216), and performs shooting availability determination processing.
- the process is terminated, and the process proceeds to the composition possibility determination process. If there is no error in step S212, the photographing availability determination process is terminated, and the process proceeds to the composition availability determination process.
- the composition possibility determination process (step S220) after the transfer is the same as in the first and second embodiments.
- the change value can be replaced with a suggestion value, or replaced with an initial value. You may comprise.
- MRI apparatus of this embodiment is basically the same as the process of any one of the first to third embodiments, but the composition availability determination process by the composition availability determination unit is different.
- composition possibility determination process of the present embodiment which is different from the first to third embodiments, will be described.
- the composition availability determination unit performs common value determination processing, slice consistency determination processing, and OL amount determination processing as in the first to third embodiments. However, unlike the above embodiments, in this embodiment, the processing is always performed in this order, and an error display process is performed for each processing, and the user is inquired whether to proceed with the processing.
- the compositability determination process by the compositability determination unit of the present embodiment will be described.
- FIG. 17 is a processing flow of the composition possibility determination processing of the present embodiment.
- the composition availability determination unit performs a common value determination process (step S231). The details of this process are the same as the common value determination process of each of the above embodiments. Then, it is determined whether there is an error (step S232). If it is determined that there is an error, an error display process is performed (step S233).
- the common value error display screen information recorded in the common value error display list and a button for accepting whether or not to allow shooting with the shooting parameter in which an error has occurred are displayed.
- Fig. 18 (a) shows an example of the common value error display screen 1810.
- the common value error display screen 1810 of the present embodiment includes a message display unit 1811, an error information display unit 1812 that displays information for specifying a job group in error and shooting parameters, A button unit 1813 for accepting the approval / disapproval intention.
- step S234 When an instruction to permit is accepted via the button unit 1813 (step S234), the process is continued and the process proceeds to step S241.
- the intention of non-permission is accepted (step S234), the process proceeds to step S260, the photographing is set to be impossible, and the composition permission / inhibition determination process is ended.
- the composition availability determination unit performs slice consistency determination processing (step S241). The details of this process are the same as the slice consistency determination process of each of the above embodiments. Then, the presence / absence of an error is determined (step S242). If it is determined that there is an error, an error display process is performed (step S243).
- an error display process is performed (step S243).
- information recorded in the slice consistency error display list and a button for accepting whether or not to allow shooting with an imaging parameter in which an error has occurred are displayed. To do.
- Fig. 18 (b) shows an example of the slice consistency error display screen 1820.
- the slice consistency error display screen of the present embodiment includes a message display unit 1821, an error information display unit 1822 that displays information specifying the group in which an error has occurred and imaging parameters, and whether or not imaging is possible.
- a button portion 1823 that accepts the intention of the user.
- the composition availability determination unit performs OL amount determination processing (step S251).
- the details of this process are the same as the OL amount determination process of each of the above embodiments.
- the presence / absence of an error is determined (step S252). If it is determined that there is an error, an error display process is performed (step S253).
- the OL amount error display screen information recorded in the OL amount error display list and a button for accepting the intention of whether or not to allow photographing with the photographing parameter in which the error has occurred are displayed.
- Fig. 18 (c) shows an example of OL amount error display screen 1830.
- the OL amount error display screen 1830 of this embodiment includes a message display unit 1831, an error information display unit 1832 that displays information for identifying the group in which an error has occurred, A receiving button portion 1833.
- an end display is performed (step S261), and the process is terminated.
- a screen for accepting a final instruction to replace the initial value with the changed value is displayed as in the above embodiments.
- step S234 when the intention of non-permission is accepted (step S234), the process proceeds to step S260, the photographing is set to be impossible, a message to that effect is displayed (step S260), and the composition feasibility judgment process is terminated.
- a display in which shooting parameters can be changed again may be performed.
- a shooting availability determination process is performed.
- the present invention when an error occurs in each process, the user is asked whether or not shooting is possible.
- the present invention is not limited to this.
- the following slice consistency determination process is performed only when there is no error in the common value determination process, and the next OL amount determination process is performed only when there is no error in the slice consistency determination process. If there is an error, it may be configured to set the photographing impossible without asking whether or not photographing is possible.
- the slice consistency determination process and the OL amount determination process should be performed in Task units, not between Jobs in the group. It may be configured. By using a task unit, the processing speed can be increased.
- the recommended value may be displayed in the error display process (steps S233, S243, S253).
- the recommended value is calculated when an error is determined in each process. For example, in the common value determination process, the most common value at the time of processing is set as the recommended value in the Job group that should have the same value. In the slice consistency determination process, the most frequently used value at the time of processing within the Job group to be matched is set as the recommended value. In the OL amount determination process, the recommended value is the value closest to the value of the imaging parameter in error within the recommended range of the OL amount.
- the photographing can be disabled, so that a high-quality composite image can be obtained with certainty. Therefore, in addition to the effects obtained in the above embodiments, the quality of the composite image can be improved. Further, in determining whether or not the composition can be performed, if an error occurs in the previous determination process, it is possible to terminate the process without performing the following determination process by disabling shooting, so that unnecessary processing is not required. Accordingly, the processing efficiency is improved.
- multi-station / multi-sequence imaging has been described as an example.
- the techniques of the above-described embodiments can be applied as they are even to multi-station / single-sequence imaging.
- the change of the shooting parameter is described as affecting only within each Job, but the premise is not limited to this. For example, if a group of Jobs that are determined to use the same shooting parameters in the same shooting sequence is specified in advance, and the shooting parameters are changed in one of the Jobs, all the same shootings in that Job group You may comprise so that a parameter may be changed.
- information (link information) for associating related Job groups is stored in the storage unit 116 in advance.
- FIG. 19 is a diagram for explaining each link example.
- FIG. 19 (a) is an example in which the related Job group is configured within 1 Task
- FIG. 19 (b) is an example in which the related Job group is configured beyond Task
- FIG. c) is an example in which related Jobs are configured both within 1 Task and between Tasks.
- Jobs connected by dotted lines 191, 192, and 193 are related Jobs.
- the shooting parameter is changed in a job surrounded by a thick frame, the same shooting parameter is changed in all related Job groups.
- composition is possible is determined.
- whether or not composition is possible is not necessarily determined.
- different imaging sites stations are performed in the same imaging sequence.
- the parameter check process is performed for all Jobs in which the shooting parameter is changed in response to an instruction to change the shooting parameter from the user.
- processing may be performed when a parameter check start instruction is received.
- the parameter check may be performed only for a job instructed by the user, not for all jobs whose shooting parameters have been changed.
- MRI apparatus 101 subject, 102 static magnetic field magnet, 103 gradient magnetic field coil, 104 RF transmission coil, 105 RF reception coil, 106 signal detection unit, 107 signal processing unit, 109 gradient magnetic field power supply, 110 RF transmission unit, 111 control Section, 112 bed, 113 bed drive section, 114 input section, 115 display section, 116 storage section, 300 sequence management table, 301 JobID, 302 Task name, 303 group name, 304 Job name, 305 shooting sequence type, 700 1st Error display screen, 701 Task name display area, 702 Job name display area, 703 Message display area, 711 Second error display screen, 711 Job display area, 712 Shooting parameter type display area, 713 Cancel button, 1500 1st Error suggestion display screen, 1501 Task name display area, 1502 Job name display area, 1503 Message display area, 1504 End button, 1511 Second error suggestion Display screen, 1511 Job display area, 1512 Shooting parameter type display area, 1513 Suggestion display area, 1514 Change instruction reception
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Abstract
Description
以下、本発明の実施の形態を図面を参照して説明する。本発明の実施形態を説明するための全図において、同一機能を有するものは同一符号を付し、その繰り返しの説明は省略する。MRI装置の実施の形態を、図面を参照して説明する。
また、位相エンコード方向が体軸と垂直な方向の場合、以下の式(2)で算出される。
また、撮影断面がアキシャル断面の場合、以下の式(3)で算出される。
そして、算出したhfFOVを用い、隣接するステーション間のOL量を計算する(ステップS2232)。図11は、隣接するステーション間のOL量算出を説明するための図である。OL量は、hfFOVとステーション位置とから算出する。ステーション位置とは、各ステーションのベッドポジション(体軸方向におけるFOVの中心を示す符号付き座標)である。なお、ベッドポジションは上述のように撮影パラメータの1つである。
次に、算出したOL量が、OLの推奨範囲(dOLMinからdOLMax)内に入っているか否かを判別する(ステップS2233)。ここで、推奨範囲dOLMinからdOLMaxは、合成画像の画質と検査時間とを考慮して、最少のOL量としてdOLMin、最大のOL量としてdOLMaxが定められる。dOLMinは、一定の画質を保障するために必須の最少OL量であり、dOLMaxは、これ以上のOL量の増加は、画質の向上というメリットに比べ検査時間が長引くというデメリットの方が大きくなると判断されるOL量である。dOLMinおよびdOLMaxは、予め定められ、記憶部116に記憶される。
次に、本発明を適用する第二の実施形態について説明する。本実施形態のMRI装置は、基本的に第一の実施形態と同様である。第一の実施形態では、パラメータチェック部において撮影可否判別部は、エラーがあった場合、エラーがあった旨の表示を行い、ユーザに変更を促している。しかし、本実施形態では、さらに、推奨する撮影パラメータの値を、サジェスチョンとしてユーザに提示し、サジェスチョンを選択可能なように構成する。以下、本実施形態について、第一の実施形態と異なる構成に主眼をおいて説明する。
次に本発明を適用する第三の実施形態について説明する。本実施形態のMRI装置は、基本的に第二の実施形態と同様である。ただし、本実施形態では、撮影パラメータにエラーがあった場合、推奨値として算出したサジェスチョンに自動的に置き換える。以下、本実施形態について、第二の実施形態と異なる構成に主眼をおいて説明する。
次に、本発明を適用する第四の実施形態について説明する。本実施形態のMRI装置は、基本的に第一~第三の各実施形態のいずれかの処理と同様であるが、合成可否判別部による合成可否判別処理が異なる。以下、第一~第三の各実施形態と異なる、本実施形態の合成可否判別処理について説明する。
Claims (9)
- マルチステーション撮影を行う磁気共鳴イメージング装置であって、
前記マルチステーション撮影の各ステーションにおいて実行される撮影を管理する撮影管理部と、
前記撮影管理部に管理される撮影毎に、当該撮影に用いられる撮影パラメータ値の入力を受け付ける入力部と、
前記入力部を介して新たな撮影パラメータ値が入力された各撮影について、前記入力された新たな撮影パラメータ値の適否を判別する撮影可否判別部と、
前記撮影可否判別部で不適と判別された撮影パラメータ値がある撮影について、当該撮影を特定可能な情報および前記不適と判別された撮影パラメータ値をエラーとして表示するエラー表示部と、を備えること、
を特徴とする磁気共鳴イメージング装置。 - 請求項1記載の磁気共鳴イメージング装置であって、
前記撮影可否判別部により、不適切と判別された撮影パラメータ値がない場合、前記新たに入力された撮影パラメータ値を用いてステーション間の画像の合成の可否を判別する合成可否判別部をさらに備え、
前記エラー表示部は、前記合成可否判別部において合成不可と判別された場合、前記合成不可と判別された隣接する両ステーションを特定可能な情報とともに合成不可を意味する情報を表示すること、
を特徴とする磁気共鳴イメージング装置。 - 請求項2に記載の磁気共鳴イメージング装置であって、
前記合成可否判別部は、
予め定められた撮影間で同一の値をもつべき撮影パラメータが当該撮影間で同一の値を有するか否かを判別する共通値判別部と、
ステーション間でスライスが整合する必要がある撮影について、スライスの整合性を判別するスライス整合性判別部と、
再構成した画像を合成する撮影群について、隣接するステーション間のオーバラップ量が所定の範囲内であるか判別するオーバラップ判別部と、を備え、
前記エラー表示部は、
前記共通値判別部で判別した撮影パラメータについて異なる値を有する撮影パラメータがある場合、当該撮影パラメータと、当該撮影パラメータが同一であるべき撮影を特定可能な情報とを表示し、前記スライス整合性判別部でスライスに不整合がある場合、不整合の発生した撮影を特定可能な情報を表示し、前記オーバラップ部でオーバラップ量が前記所定の範囲外である場合、範囲外である隣接する両ステーションを特定する情報を表示すること、
を特徴とする磁気共鳴イメージング装置。 - 請求項3に記載の磁気共鳴イメージング装置であって、
前記スライス整合性判別部は、前記共通値判別部が同一の値を有すると判別した場合、前記スライスの整合性を判別する処理を行い、
前記オーバラップ判別部は、前記スライス整合性判別部が前記スライスの整合性を判別する必要がある撮影について全てのスライスが整合すると判別した場合、前記隣接するステーション間のオーバラップ量が所定の範囲内であるか判別する処理を行うこと、
を特徴とする磁気共鳴イメージング装置。 - 請求項1に記載の磁気共鳴イメージング装置であって、
前記撮影可否判別部は、
不適と判別された前記撮影パラメータ値について、当該撮影パラメータ値の許容範囲の中で前記入力された撮影パラメータ値に最も近い値を推奨値として算出する推奨値算出部と、
オペレータからの指示に従って、前記不適切と判別された撮影パラメータ値を前記推奨値に置き換える置換部と、を備え、
前記エラー表示部は、前記推奨値をさらに表示すること、
を特徴とする磁気共鳴イメージング装置。 - 請求項1に記載の磁気共鳴イメージング装置であって、
前記撮影可否判別部は、
不適切と判別された撮影パラメータ値について、当該撮影パラメータ値の許容範囲の中で前記入力された撮影パラメータ値に最も近い値を算出し、当該算出した値に置き換える置換部を備えること、
を特徴とする磁気共鳴イメージング装置。 - 請求項1に記載の磁気共鳴イメージング装置であって、
前記撮影可否判別部において、不適と判別された撮影パラメータ値がない場合、前記入力された新たな撮影パラメータ値を撮影に用いる撮影パラメータとして設定する撮影パラメータ設定部をさらに備えること、
を特徴とする磁気共鳴イメージング装置。 - マルチステーション撮影を行う際に用いられる撮影パラメータ値を前記マルチステーション撮影実行開始前に設定する撮影パラメータ設定支援方法であって、
所望の撮影パラメータ値の入力を受け付ける入力受付ステップと、
前記マルチステーション撮影で実行される全撮影の中から、撮影パラメータ値が新たに入力された撮影を特定する撮影特定ステップと、
前記撮影特定ステップにおいて特定された各撮影について、新たに入力された撮影パラメータ値の適否を判別する撮影可否判別ステップと、
前記撮影可否判別ステップにおいて、不適と判別された撮影パラメータ値がある撮影について、当該撮影を特定可能な情報および前記不適と判別された撮影パラメータ値をエラーとして表示する表示ステップと、を備えること、
を特徴とする撮影パラメータ設定支援方法。 - 請求項8に記載の撮影パラメータ設定支援方法であって、
前記撮影可否判別ステップにおいて、不適と判別された撮影パラメータ値がない場合、前記新たに入力された撮影パラメータ値を用いてステーション間の画像の合成の可否を判別する合成可否判別ステップと、
前記合成可否判別部において合成不可と判別された場合、前記合成不可と判別された隣接する両ステーションを特定可能な情報とともに合成不可を意味する情報を表示する合成可否表示ステップと、をさらに備えること、
を特徴とする撮影パラメータ設定支援方法。
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| WO2012165485A1 (ja) * | 2011-05-31 | 2012-12-06 | 株式会社東芝 | 磁気共鳴イメージング装置 |
| JP2015091296A (ja) * | 2013-10-01 | 2015-05-14 | 株式会社東芝 | 磁気共鳴イメージング装置及び撮像計画プログラム |
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| DE102014211586B3 (de) * | 2014-06-17 | 2015-10-22 | Siemens Aktiengesellschaft | Verwendung von Abhängigkeitsdatensätzen bei der Bereitstellung und/oder Überprüfung von MR-Messsequenzen |
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| JP2007181659A (ja) * | 2005-12-08 | 2007-07-19 | Hitachi Medical Corp | 画像処理装置、磁気共鳴イメージング装置及び画像処理方法 |
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| WO2012060373A1 (ja) * | 2010-11-01 | 2012-05-10 | 株式会社東芝 | 磁気共鳴イメージング装置及び磁気共鳴撮像方法 |
| CN102596027A (zh) * | 2010-11-01 | 2012-07-18 | 株式会社东芝 | 磁共振成像装置以及磁共振摄像方法 |
| US10429472B2 (en) | 2010-11-01 | 2019-10-01 | Toshiba Medical Systems Corporation | Magnetic resonance imaging apparatus and method for magnetic resonance imaging with copying and setting of parameter values |
| WO2012165485A1 (ja) * | 2011-05-31 | 2012-12-06 | 株式会社東芝 | 磁気共鳴イメージング装置 |
| JP2013009955A (ja) * | 2011-05-31 | 2013-01-17 | Toshiba Corp | 磁気共鳴イメージング装置 |
| US9671480B2 (en) | 2011-05-31 | 2017-06-06 | Toshiba Medical Systems Corporation | Magnetic resonance imaging apparatus |
| JP2015091296A (ja) * | 2013-10-01 | 2015-05-14 | 株式会社東芝 | 磁気共鳴イメージング装置及び撮像計画プログラム |
| US10149632B2 (en) | 2013-10-01 | 2018-12-11 | Toshiba Medical Systems Corporation | Magnetic resonance imaging apparatus and imaging planning method |
| US10729355B2 (en) | 2013-10-01 | 2020-08-04 | Canon Medical Systems Corporation | Magnetic resonance imaging apparatus and imaging planning method |
Also Published As
| Publication number | Publication date |
|---|---|
| US8742756B2 (en) | 2014-06-03 |
| JPWO2009151041A1 (ja) | 2011-11-17 |
| JP5506675B2 (ja) | 2014-05-28 |
| US20110074418A1 (en) | 2011-03-31 |
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