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WO2015072805A1 - Dispositif de prise de cliché tdm, méthode de prise de cliché tdm, fantôme cible pour prise de cliché tdm et image tdm utilisant le fantôme - Google Patents

Dispositif de prise de cliché tdm, méthode de prise de cliché tdm, fantôme cible pour prise de cliché tdm et image tdm utilisant le fantôme Download PDF

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Publication number
WO2015072805A1
WO2015072805A1 PCT/KR2014/011059 KR2014011059W WO2015072805A1 WO 2015072805 A1 WO2015072805 A1 WO 2015072805A1 KR 2014011059 W KR2014011059 W KR 2014011059W WO 2015072805 A1 WO2015072805 A1 WO 2015072805A1
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Prior art keywords
image
target phantom
unique
target
phantom
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PCT/KR2014/011059
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English (en)
Korean (ko)
Inventor
최성일
한태희
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Vatech Co Ltd
Vatech Ewoo Holdings Co Ltd
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Vatech Co Ltd
Vatech Ewoo Holdings Co Ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
    • A61B6/51—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for dentistry
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/58—Testing, adjusting or calibrating thereof
    • A61B6/582—Calibration
    • A61B6/583—Calibration using calibration phantoms

Definitions

  • the present invention relates to a tomography apparatus using X-rays, that is, a CT (computed tomography) apparatus and a CT imaging method, and more particularly, a dental CT imaging apparatus including a tooth as the main subject of the human body; It relates to a CT imaging method using the same.
  • a CT computed tomography
  • an X-ray imaging apparatus refers to a device that transmits a predetermined amount of X-rays to a body part to be photographed, and provides an image using an electrical signal generated by the X-ray sensor receiving the transmitted X-rays. Since the X-rays transmitted through the body part generate different electric signals according to the X-ray absorption rate of each point of the body photographing part, the electric signals may be processed through a central processing unit provided in the X-ray imaging apparatus, thereby realizing an image.
  • CT computed tomography
  • CBCT cone beam CT
  • MDCT medical CT
  • An object of the present invention is to improve the accuracy of the CT number detected through the imaging image of the dental CBCT. More specifically, the present invention improves the accuracy of CT numbers for tissues in a subject by calibrating and outputting an image obtained by inserting a target phantom into a subject using a CT number of the target phantom known in advance. It is an object of the present invention to provide a CT imaging apparatus and a CT imaging method.
  • a CT imaging apparatus for acquiring a CT image of the subject with a target phantom having a unique CT number; And identifying the target phantom from the CT image acquired by the CT imaging unit, and adjusting the CT image based on the difference between the CT number of the target phantom and the unique CT number of the target phantom displayed on the CT image. It includes an image processor.
  • the target phantom may be one having two or more different unique CT numbers.
  • the target phantom may have a unique code embedded in at least one of a shape, a marker, an arrangement, and a structure, and the image processor may identify the target phantom and the unique CT number with the unique code. have.
  • the image processing unit may include: a target phantom identification module identifying the target phantom from the CT image; A target phantom data module for obtaining information about a unique CT number of the identified target phantom; And an image adjustment module for adjusting the CT image such that the target phantom is displayed according to a unique CT number.
  • the target phantom may have a unique code embedded in its own shape or in the form and arrangement of a marker, and the target phantom identification module may identify the unique code from the CT image.
  • the target phantom data module may be to acquire a unique CT number corresponding to the target phantom identified from a data group previously stored in a data storage inside or outside the CT imaging apparatus.
  • a target phantom according to one aspect of the present invention is inserted into a CT field of view (FOV) including a subject and CT shot with the subject, two or more having a unique CT number.
  • FOV CT field of view
  • the target phantom may be a mouthpiece or a bite block inserted into the subject during CT imaging.
  • CT imaging method comprises the steps of acquiring a CT image with a target phantom having a unique CT number inserted into the CT imaging range (FOV, Field Of View) with the subject; And identifying the target phantom from the acquired CT image, finding a correction condition based on the difference between the CT number of the target phantom and the target phantom displayed on the CT image and the unique CT number, and based on the correction condition. Adjusting the image.
  • a target phantom having two or more unique CT numbers exists within a CT field of view (FOV) including a subject, and the target phantom is the two or more unique CT numbers.
  • the portion corresponding to at least one of the portions is represented by the gray scale level corresponding to the unique CT number of the portion.
  • an effect of improving the accuracy of the CT number detected through the captured image of the dental CBCT there is an effect of improving the accuracy of the CT number detected through the captured image of the dental CBCT. More specifically, according to the present invention, an image obtained by inserting a target phantom into a subject is calibrated and output using a previously known CT number of the target phantom, thereby improving the accuracy of the CT number for the tissue in the subject. There is an effect of providing a CT imaging apparatus and a CT imaging method to be improved.
  • FIG. 1A illustrates an example of acquiring a CT image of a subject into which a target phantom is inserted in a CT imaging apparatus according to an exemplary embodiment.
  • FIG. 1B illustrates an example in which the CT image of FIG. 1A is adjusted so that the target phantom is displayed according to a unique CT number in a CT imaging apparatus according to an exemplary embodiment.
  • FIG. 2 is a perspective view showing a target phantom according to an embodiment of the present invention.
  • FIG. 3 is a cross-sectional view of the target phantom of FIG.
  • FIG. 4 is a cross-sectional view showing a target phantom tomography according to an embodiment of the present invention.
  • FIG. 5 is a perspective view showing a target phantom according to an embodiment of the present invention.
  • FIG. 6 is a perspective view showing a target phantom according to an embodiment of the present invention.
  • FIG. 7 is a block diagram showing the configuration of a CT imaging apparatus according to an embodiment of the present invention.
  • FIG. 8 is a flowchart showing a CT imaging method according to an embodiment of the present invention.
  • FIG. 1A illustrates an example of acquiring a CT image of a subject into which a target phantom is inserted in a CT imaging apparatus according to an exemplary embodiment. That is, FIG. 1A shows a CT image of a state before calibrating an image using the target phantom 10.
  • a CT image is acquired with a target phantom 10 having a known unique CT number in advance in a field of view (FOV) of a subject, for example, a patient's mouth. do.
  • FOV field of view
  • the CT image is obtained by using a X-ray generator, an X-ray sensor, and a driving device for driving the same as in a general CT imaging apparatus, and photographing a plurality of X-ray images from various angles, and reconstructing a plurality of X-ray images. This is done by obtaining a tomographic image corresponding to a slice (monolayer) of.
  • the CT image taken by the dental CBCT is less accurate than the CT image taken by the medical CT.
  • the accuracy of CT numbers for soft tissues is poor.
  • the biggest causes of the accuracy of CT numbers in CBCT are scatter lines and truncated conditions. Scattered line is a problem that occurs due to the characteristics of CBCT, and scattered X-rays are included in X-ray image data of slices to be viewed, which are different from each other. Because of the difference, compensation methods are difficult and inaccurate.
  • the acquired CT image is based on the unique CT number of the target phantom 10 that is inserted into the subject, more specifically, to a portion adjacent to the tissue of interest and photographed together.
  • the CT number is a value related to the X-ray transmittance, and since there is a fixed defined value for bone, soft tissue, water, and air, the CT of the subject by using a target phantom made using a material having a unique CT number close to this value The number can be detected more accurately.
  • multiple calibration reference values may be provided in one target phantom.
  • FIG. 1A a target phantom 10 consisting of regions having three CT numbers is disclosed.
  • the CT number of the tissue is represented by a gray scale level.
  • the level expressed in the CT image before calibration as shown in FIG. 1A does not exactly match the CT number of the corresponding tissue. This is because an error due to scattering lines or truncated conditions exists as described above. Since the influence of the scattering line or the error due to the truncated condition varies depending on the state of the subject or the position in the subject, the target phantom 10 is disposed at a position close to the tissue of interest even in the subject, It is desirable to calibrate and adjust the image.
  • the CT image before the adjustment may not be displayed on the screen. However, depending on the user's selection, it may be displayed for the purpose of comparison before and after adjustment.
  • FIG. 1B illustrates an example in which the CT image of FIG. 1A is adjusted so that the target phantom is displayed according to a unique CT number in a CT imaging apparatus according to an exemplary embodiment.
  • the target phantom 10 is composed of three regions each having a unique CT number.
  • an image processor mounted on a CT imaging apparatus displays CT numbers of parts of a tomography of a subject, which are detected through a CT image reconstructing a plurality of X-ray image data, on a screen corresponding to a gray scale level that can be expressed.
  • the mapping of the gray scale levels to the detected CT numbers that is, the mapping operation, is performed by using a kind of lookup table that is preset and stored in the image processing unit. It may be performed to correspond to.
  • the CT imaging apparatus already knows the unique CT numbers for the respective regions of the target phantom 10.
  • the CT imaging apparatus previews the CT numbers in the CT image before adjusting the three regions of the detected target phantom 10.
  • Each unique CT number is used as a calibration reference value, and the adjustment is made by applying the same adjustment conditions as the adjustment conditions for the corresponding area to the entire CT image before adjustment. Increase the accuracy of the CT number on the subject tissue.
  • the adjustment condition will be described as follows.
  • the first example is selected based on any one of the three unique CT numbers, for example, close to the CT number of the tissue of interest in the subject, and the CT number before the adjustment of the corresponding region of the target phantom 10 and the corresponding unique CT.
  • the adjustment condition that applies the formula to correct the number difference is applied to the entire CT image before the adjustment.
  • an adjustment condition for obtaining a correction equation for matching the CT numbers before adjustment of the three regions of the target phantom 10 with corresponding unique CT numbers, and applying the correction expression to the entire CT image before adjustment Can be mentioned.
  • the difference between the three unique CT numbers or some of them and the CT number before the adjustment of the corresponding area is obtained, and the CT number is an intermediate value between them, such as the CT number before the adjustment and the unique CT number.
  • a correction equation that matches the mean value can also be obtained and applied to the entire CT image before adjustment.
  • FIG. 2 is a perspective view illustrating a target phantom according to an embodiment of the present invention
  • FIG. 3 is a cross-sectional view illustrating a target phantom of FIG. 2.
  • the target phantom 10 according to the present embodiment consists of three regions, which have different unique CT numbers for each region.
  • the three regions may be made of different materials m1, m2, and m3.
  • it may be made of a metal having a unique CT number similar to a CT number of bone, or a synthetic resin (eg, PMMA) having a unique CT number similar to Teflon, water, or soft tissue.
  • the target phantom 10 may be selected to include a region of the subject having a unique CT number that is similar to the approximate CT number of the tissue of interest.
  • a calibration equation for calibration may be set for each region of the target phantom.
  • the CT image may be adjusted by determining the CT number distribution of the CT image before the adjustment, matching each region of the image with the region of the target phantom, and applying a calibration reference value of the corresponding target phantom region to the image.
  • the unique CT numbers of the different materials m1, m2, and m3 that make up the three regions of the target phantom are similar to the CT number of the bone, the CT number of the soft tissue, and the air and CT numbers, the CT image before the adjustment is CT.
  • the area of the three substances can be classified based on the number, and the CT number of the three substances can be adjusted based on the calibration reference value of each target phantom region to improve the image quality for each region of the substance constituting the subject. have.
  • the target phantom 10 may include a marker c1 for internalizing the identification code.
  • the marker c1 may be made of a material whose X-ray transmission characteristic is clearly distinguished from other regions of the target phantom 10, and may be identified as shown in FIG. 3 in a tomography image.
  • the CT imaging apparatus when the marker c1 is recognized, the CT number of the material m1 constituting the furthest region from the target phantom 10 to which it belongs, the CT number of the material m2 constituting the middle region, and Information about the CT number of the material m3 forming the nearest region can be extracted from a pre-stored data group, and these can be used to adjust the CT image.
  • the extracted information may include information such as a specification of the target phantom 10 including the marker c1, a material composition according to the distance from the marker c1, and a CT number according to the distance.
  • the CT image is adjusted using some or all of them as calibration reference values.
  • Various adjustment conditions for adjusting the CT image are as described above.
  • FIG 4 is a cross-sectional view showing a target phantom tomography according to an embodiment of the present invention.
  • the target phantom 11 according to the present embodiment is made of three materials (m1, m2, m3) having different unique CT numbers, but the same as the embodiment of FIGS.
  • the arrangement of the markers c1, c2, c3, which is a means of internalizing the identification code, is different.
  • each of the constituent materials m1, m2, and m3 of the target phantom may be identified according to the number of unit markers.
  • FIG. 5 is a perspective view showing a target phantom according to an embodiment of the present invention.
  • the target phantom 12 according to the present embodiment is made of three materials m1, m2, and m3 having different unique CT numbers, and is the same as the embodiment of FIGS. 2 to 3, and the target phantom 12
  • the means for internalizing the identification code is a ratio of the size of each of the constituent materials (m1, m2, m3).
  • the unique code for identifying the CT number of the target phantom 12 or the CT number of each region belonging thereto may be internalized in various forms. For example, it can be variously internalized in the form of the shape, relative size of the target phantom each region or the shape and arrangement of the markers.
  • Target phantom 13 shows an example formed in the shape of a mouthpiece so that the patient can take a CT image in the state of the door between the upper and lower jaw.
  • the unique CT number is composed of three materials (m1, m2, m3) different from each other is the same as the embodiment of Figs.
  • the target phantom may have any form as long as it can be inserted into a subject's photographing area, that is, a field of view (FOV), and a unique CT number may be used for the material forming the target phantom.
  • FOV field of view
  • Any known substance does not matter what kind of substance it is.
  • the CT imaging apparatus includes an image capturing unit 21, an image processing unit 22, and a display unit 23.
  • the image capturing unit 21 is for acquiring CT images of a subject, and photographs a plurality of X-ray images from various angles using an X-ray generator, an X-ray sensor, and a driving device for driving the same as in a general CT imaging apparatus. do.
  • the image processor 22 reconstructs a plurality of X-ray images thus obtained to acquire a tomography image corresponding to an arbitrary slice (tomography).
  • the image processor 22 identifies the target phantom from the obtained CT image, and adjusts the CT image so that the target phantom is displayed according to a unique CT number in the CT image.
  • the image processor 22 may include a target phantom identification module 201 for identifying the target phantom from a CT image before adjustment, and the target identified from a data group previously stored in a data storage inside or outside the CT imaging apparatus. And a target phantom data module 202 for acquiring a unique CT number corresponding to the phantom, and an image adjusting module 203 for calibrating the CT image such that the target phantom is displayed according to its unique CT number.
  • the target phantom data module 202 may include a data group for various target phantoms and an interface for accessing the data group to extract necessary data and transmit the data.
  • the data population may be, for example, a kind of database structured including a variety of target phantoms or a unique code that can identify each constituent when they consist of a plurality of materials and unique CT number data corresponding to the unique code.
  • the image adjustment module 203 may display the CT number of the target phantom detected in the CT image before adjustment so that the target phantom is displayed on the screen of the display unit 23 according to the unique CT number. Is corrected by the unique CT number extracted by the same and applied to the rest of the pre-adjusted CT image, that is, the tissue part of the subject, to be calibrated. Increase the accuracy of CT numbers for subject tissue in adjusted CT images.
  • FIG. 8 is a flowchart showing a CT imaging method according to an embodiment of the present invention.
  • an image display step (s3) of outputting the adjusted CT image in the form of a screen or a print is the result of the so-called image processing step (s2) and the image processing step (s2).
  • the image processing step (s2) identifies the unique code of the target phantom inserted in the FOV including the subject from the CT image (s21), and the unique code corresponding to the unique code identified from the previously acquired data group. Acquiring CT number data (s22), and calibrating the CT image as a whole (s23) so that the target phantom is displayed on the display screen according to its unique CT number.
  • Each process of the image processing step (s2) may be understood in more detail through the description of the image processor 22 in the description of the CT imaging apparatus according to the embodiment of FIG.

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Abstract

L'invention concerne un dispositif de prise de cliché TDM, une méthode de prise de cliché TDM, un fantôme cible pour prise de cliché TDM et une image TDM utilisant le fantôme. Le dispositif de prise de cliché TDM selon l'invention comprend : une unité de prise de cliché TDM qui acquiert l'image TDM d'un sujet chez qui un fantôme cible ayant un numéro TDM unique est inséré ; et une unité de traitement d'image qui identifie le fantôme cible d'après l'image TDM acquise par l'unité de prise de cliché TDM et qui ajuste l'image TDM en fonction de la différence entre le numéro TDM du fantôme cible, qui est affiché sur l'image TDM, et le numéro TDM unique du fantôme cible. La méthode de prise de cliché TDM de l'invention comprend les étapes consistant à : acquérir une image TDM dans un état où le fantôme cible ayant le numéro TDM préalablement connu est inséré dans la gamme des clichés du sujet ; et à identifier le fantôme cible d'après l'image TDM acquise et à ajuster l'image TDM en fonction de la différence entre un numéro TDM du fantôme cible, qui est affiché sur l'image TDM, et un numéro TDM unique du fantôme cible.
PCT/KR2014/011059 2013-11-18 2014-11-18 Dispositif de prise de cliché tdm, méthode de prise de cliché tdm, fantôme cible pour prise de cliché tdm et image tdm utilisant le fantôme Ceased WO2015072805A1 (fr)

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KR1020130139782A KR20150057013A (ko) 2013-11-18 2013-11-18 Ct 촬영 장치, ct 촬영 방법, ct 촬영을 위한 표적 팬텀 및 이를 이용한 ct 영상
KR10-2013-0139782 2013-11-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106264579A (zh) * 2016-09-29 2017-01-04 四川大学 一种可以验证射束硬化对cbct成像质量的影响的装置
CN112535488A (zh) * 2019-09-23 2021-03-23 佳能医疗系统株式会社 解析装置
CN116570308A (zh) * 2023-03-30 2023-08-11 东软医疗系统股份有限公司 数据处理方法及装置、ct设备和存储介质

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KR102052915B1 (ko) 2018-05-16 2019-12-06 한림대학교 산학협력단 의료기기 검사용 팬텀 장치 및 이에 삽입되는 어댑터 플레이트
KR102884687B1 (ko) * 2022-06-08 2025-11-11 오스템임플란트 주식회사 신경관 표시 방법, 컴퓨팅 장치 및 이를 위한 컴퓨터 판독 가능한 기록 매체
KR102654367B1 (ko) * 2023-09-27 2024-04-03 주식회사 일렉필드퓨처 포터블 엑스레이 촬영 장치

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JP2005518832A (ja) * 2002-02-27 2005-06-30 イメージング セラピューティクス，インコーポレーテッド Ｘ線画像の定量解析の方法と装置
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106264579A (zh) * 2016-09-29 2017-01-04 四川大学 一种可以验证射束硬化对cbct成像质量的影响的装置
CN112535488A (zh) * 2019-09-23 2021-03-23 佳能医疗系统株式会社 解析装置
CN116570308A (zh) * 2023-03-30 2023-08-11 东软医疗系统股份有限公司 数据处理方法及装置、ct设备和存储介质
CN116570308B (zh) * 2023-03-30 2025-10-28 东软医疗系统股份有限公司 数据处理方法及装置、ct设备和存储介质

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