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WO2018182317A1 - Appareil de balayage de tomodensitométrie à rayons x et son procédé de balayage - Google Patents

Appareil de balayage de tomodensitométrie à rayons x et son procédé de balayage Download PDF

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Publication number
WO2018182317A1
WO2018182317A1 PCT/KR2018/003679 KR2018003679W WO2018182317A1 WO 2018182317 A1 WO2018182317 A1 WO 2018182317A1 KR 2018003679 W KR2018003679 W KR 2018003679W WO 2018182317 A1 WO2018182317 A1 WO 2018182317A1
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WO
WIPO (PCT)
Prior art keywords
ray
photographing
generator
imaging
rotation axis
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Ceased
Application number
PCT/KR2018/003679
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English (en)
Korean (ko)
Inventor
최성일
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vatech Co Ltd
Vatech Ewoo Holdings Co Ltd
Original Assignee
Vatech Co Ltd
Vatech Ewoo Holdings Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vatech Co Ltd, Vatech Ewoo Holdings Co Ltd filed Critical Vatech Co Ltd
Publication of WO2018182317A1 publication Critical patent/WO2018182317A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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]

Definitions

  • the present invention relates to an X-ray CT imaging apparatus and an imaging method thereof, and more particularly, to an apparatus configuration and an imaging method for shortening the X-ray imaging data acquisition time for X-ray CT image acquisition.
  • an X-ray imaging apparatus refers to a device that transmits a predetermined amount of X-rays to a body part to be photographed, detects the transmitted X-rays with an X-ray sensor, and forms an X-ray image based on the detected electrical signal.
  • X-rays are attenuated and transmitted at different attenuation rates depending on the material on the path of progress, and are converted into electrical signals by the photoelectric effect when they reach the X-ray sensor.
  • the X-ray imaging apparatus provides information about the inside of the photographing object as an X-ray image by using an electrical signal reflecting an accumulated attenuation amount according to the X-ray progress path.
  • X-ray CT images can accurately and clearly display tomographic images of the user's desired location and orientation, as well as three-dimensional X-ray images of teeth, jaw joints, or head areas of interest in the patient's body. As a result, it is utilized in fields requiring high precision such as implant procedures.
  • An X-ray computed tomography (CT) imaging apparatus reconstructs X-ray imaging data photographed from various angles of an object to provide tomography images and 3D X-ray images of the object.
  • the X-ray CT photographing apparatus supports an X-ray generator that generates and irradiates X-rays, an X-ray detector disposed opposite to the X-ray generator with the subject interposed therebetween, and supporting the X-ray generator and the X-ray detector. It includes a rotation support for rotating the X-ray generator and the X-ray detector around the axis of rotation between, and an image reconstruction unit for implementing a CT image through the detection result of the X-ray detector.
  • the X-ray generator and the X-ray detector rotate opposite to each other in a predetermined angle range about a rotation axis passing through the object, and transmit X-rays to the subject area of the subject, that is, the field of view (FOV) at various angles. Get the data.
  • the X-ray generator and the X-ray detector rotate the center axis of the photographing area as its rotation axis, and irradiate and receive X-rays passing through the entire area of the photographing area in various directions of the photographing area.
  • the X-ray photographing data is reconstructed through an image reconstruction unit, and as a result, a 3D X-ray image of a voxel unit for a photographing target area is obtained.
  • the present invention has been proposed to solve the above-mentioned problems. More specifically, the X-ray CT imaging apparatus acquires X-ray imaging data necessary for reconstructing the CT image in a relatively short time without rotating the imaging unit at an excessively high speed.
  • An object of the present invention is to provide an X-ray CT imaging apparatus and an imaging method thereof.
  • the first generator for irradiating the first X-ray beam and the first generator is disposed opposite to the first generator with the shooting target region and the rotation axis between the first generator
  • a first photographing unit having a first detector for receiving an X-ray beam; And a second detector for irradiating a second X-ray beam, and a second detector disposed to face the second generator with the photographing target area and the rotation axis interposed therebetween to receive the second X-ray beam.
  • the first photographing unit and the second photographing unit are driven to rotate about the rotation axis simultaneously.
  • the first and second X-ray beams may face each other or cross each other with respect to the rotation axis. In this case, each of the first and second X-ray beams may transmit the entirety or less in half or more of the region to be photographed.
  • the X-ray CT photographing apparatus may further include an image reconstructing unit configured to reconstruct a 3D X-ray image of the photographing target region from the X-ray photographing data received by the first and second detectors.
  • At least one of the first and second photographing units may be configured to be movable along a traveling direction of the X-ray beam such that a distance between the generator and the detector with respect to the rotation axis is variable.
  • the first and second X-ray beams may be configured to pass through upper and lower portions of the photographing target area, respectively.
  • the first and second X-ray beams may have different energy levels.
  • the X-ray CT imaging apparatus may include a rotation drive system that controls rotation of the first and second photographing units; A controller for controlling the first and second photographing units; And a readout circuit for reading out the electrical signals of the first and second detectors in units of frames.
  • the controller may control the first and second generators to irradiate the first and second X-ray beams at different timings.
  • an X-ray CT imaging apparatus and an imaging method thereof which enable the imaging unit of the X-ray CT imaging apparatus to acquire X-ray imaging data necessary for CT image reconstruction within a relatively short time without rotating at an excessively high speed. This is provided.
  • FIG. 1 is a schematic view showing a photographing unit according to an embodiment of the present invention seen in a direction of a rotation axis thereof.
  • FIG. 2 conceptually shows a configuration of a photographing unit in the embodiment of FIG. 1.
  • FIG. 3 is a schematic view of a photographing unit viewed in a direction of a rotation axis thereof according to an embodiment of the present invention.
  • FIG. 4 is a schematic view of a photographing unit viewed in a direction of a rotation axis thereof according to an embodiment of the present invention.
  • FIG. 5 is a schematic view of a photographing unit viewed in a direction of a rotation axis thereof according to an embodiment of the present invention.
  • FIG. 6 is a schematic view of a photographing unit viewed in a direction of a rotation axis thereof according to an embodiment of the present invention.
  • FIG. 7 is a schematic view of a photographing unit viewed in a direction perpendicular to a rotation axis thereof according to an embodiment of the present invention.
  • FIG. 1 is a schematic view showing a photographing unit according to an embodiment of the present invention seen in a direction of a rotation axis thereof.
  • the first generator 111 which is an X-ray generator
  • the first detector 112 which is an X-ray detector
  • the first photographing unit 110 and the second generator 121 which is another X-ray generator, are disposed with the photographing target region F interposed therebetween, and the second detector 122, which is another X-ray detector, on the opposite side thereof.
  • the second photographing unit 120 is disposed.
  • the first photographing unit 110 and the second photographing unit 120 may be disposed opposite to each other.
  • Each of the first imaging unit 110 and the second imaging unit 120 includes a first X-ray beam 11B and a second X-ray beam 21B, which are emitted and received by each imaging unit, respectively. It can be arranged to cover more than half in the width direction. Referring to the direction shown in the drawings, for example, the first X-ray beam 11B transmits at least one half of the upper left side of the photographing area F in one direction, and the second X-ray beam 21B is at the lower right side thereof. It may be arranged to transmit more than half in the opposite direction.
  • Each of the first X-ray beam 11B and the second X-ray beam 21B may be an asymmetric half-beam.
  • the present invention is not limited to the half beam, and may be a narrow full-beam having a width that can transmit at least half of the width of the photographing target area F.
  • the first X-ray beam 11B and the second X-ray beam 21B are configured to be in contact with or slightly overlap with each other at the position of the rotation axis C.
  • the above-described components of the first photographing unit 110 and the second photographing unit 120 are structurally connected by the rotation arm 130.
  • the photographing unit 100 is configured to include a rotation drive system (not shown) for rotating the rotary arm 130 with respect to the ground fixed structure about its rotation axis (C).
  • the rotation drive system may include a motor, a gear, and the like.
  • the rotation axis (C) also coincides with the longitudinal axis, which is the center of the photographing target area (C), as shown, but does not necessarily follow such restrictions.
  • the photographing unit 100 configured as described above may acquire X-ray photographing data necessary for reconstructing the X-ray CT image by performing a series of photographing sequences while rotating 180 degrees or more about the rotation axis C.
  • FIG. In the case of a conventional CT imaging apparatus having a half-beam size X-ray detector, for example, the rotational arm should be rotated 360 degrees or more, and the photographing sequence should be performed. will be. This shortens the shooting time. Assuming that the rotation speed and frame rate of the conventional device and the rotational arm are the same, the imaging sequence for the CT image acquisition can be completed in half the time, for example, within about 2 seconds.
  • the photographing unit 100 may be configured such that its center of gravity is located on the rotation axis (C).
  • an X-ray generator using a hot electron X-ray source is relatively heavier than an X-ray detector.
  • the first imaging unit 110 and the second imaging unit 120 are symmetric about the rotation axis C. By arranging with, the center of gravity of the rotating body coincides with the rotating shaft, and as a result, mechanical vibration during rotation can be suppressed.
  • FIG. 2 conceptually shows a configuration of a photographing unit in the embodiment of FIG. 1.
  • the second photographing unit 120 having the first photographing unit 110 having the first generator 111 and the first detector 112, the second generator 121, and the second detector 122 in the photographing unit 100.
  • the readout circuit 135 that reads out the electrical signals 112 and 122 in units of frames may be configured to share each other.
  • the controller 133 controls the operation of the first and second generators 111 and 121, the first and second detectors 112 and 122, and the rotation drive system 131.
  • the readout circuit 135 receives and collects electrical signals according to X-ray reception from the first and second detectors 112 and 122 in units of frames to generate multiple frames of X-ray photographing data, and includes one or more integrated circuits. It may be provided in the form of a printed circuit board (PCB).
  • the printed circuit board having the control unit 133 and the lead-out circuit 135 may be installed in the above-described rotating arm, and may be installed in a structure fixed to the ground by being connected through a cable or a flexible printed circuit (FPC). May be
  • the first and second generators 111 and 121 such as the controller 133, the lead-out circuit 135, and the like, are described.
  • the first and second detectors 112 and 122 may be connected to each other using a cable or the like to reduce the risk of trouble caused by cable twisting.
  • the controller 133 may divide and drive the first generator 111 and the second generator 121 in time. By driving the frame timings of the first imaging unit 110 and the second imaging unit 120 at different timings so as not to overlap each other, mutual interference between the first X-ray beam and the second X-ray beam may be prevented, X-ray exposure can also be maintained at the same level as the conventional method.
  • FIG. 3 is a schematic view of a photographing unit viewed in a direction of a rotation axis thereof according to an embodiment of the present invention.
  • energy levels of the first X-ray beam 12B emitted from the first generator 111 and the second X-ray beam 22B emitted from the second generator 121 may be determined. You can do it differently. Compared to the conventional X-ray CT imaging apparatus, by implementing so-called multi-energy X-ray imaging without increasing the rotation range, CT images with improved gray levels can be obtained even in soft tissues.
  • X-ray imaging data collected through the detector 112 may obtain a relatively strong tissue, that is, an image with emphasis on bones, etc.
  • X-ray imaging data collected through the second detector 122 may be relatively weak tissue, Soft tissues and other images can be obtained. It is also possible to obtain an image with emphasis on other tissues by applying appropriate weights to these two images.
  • FIG. 4 is a schematic view of a photographing unit viewed in a direction of a rotation axis thereof according to an embodiment of the present invention.
  • the photographing unit 102 includes a first photographing unit 110 and a second generator including a first generator 111 and a first detector 112 as described above with reference to FIG. 1.
  • a third including a third generator 141 and a third detector 142 having a second photographing unit 120 including a second detector 122 and a second detector 122, and arranged in a direction perpendicular to the second photographing unit 120.
  • the fourth photographing unit 150 includes a photographing unit 140, a fourth generator 151, and a fourth detector 152.
  • the X-ray beam 11B of the first imaging unit 110 and the X-ray beam 15B of the third imaging unit 140 are disposed in a direction perpendicular to each other, and the X-ray of the second imaging unit 120 is disposed.
  • the beam 21B and the X-ray beam 25B of the fourth imaging unit 150 may be arranged in a direction perpendicular to each other.
  • X-ray imaging data sufficient for CT image reconstruction may be obtained by only photographing while rotating the photographing unit 102 by 90 degrees or more.
  • FIG. 5 is a schematic view of a photographing unit viewed in a direction of a rotation axis thereof according to an embodiment of the present invention.
  • the imaging unit 200 of the X-ray CT imaging apparatus may include a first imaging unit 210 and a second generator 221 including a first generator 211 and a first detector 212 disposed to cross each other. ) And a second photographing unit 220 including a second detector 222. They differ from the above-described embodiment of FIG. 1 in that they have a first detector 212 and a second detector 222, each of which is a full-beam size X-ray detector.
  • the first photographing units 211 and 212 may be configured to have a first rotating arm 231, and the second photographing units 221 and 222 may have a second rotating arm 232.
  • the X-ray beam 13B of the first photographing unit and the X-ray beam 23B of the second photographing unit are disposed at a predetermined angle, for example, perpendicular to each other, while maintaining a relative angle.
  • the photographing unit 200 may finish the photographing sequence for acquiring the CT image by simply rotating the photographing unit 200 by 90 degrees or more.
  • the first rotary arm 231 and the second rotary arm 232 rotate about a common rotation axis C, and at least one of them extends in the longitudinal direction (the X-ray beam). It can be installed so that it can move in parallel with the direction of travel). As a result, X-ray imaging data of different magnifications can be obtained for the same subject.
  • they may be configured such that the relative angle ⁇ between the first rotary arm 231 and the second rotary arm 232 is variable. As a result, different amounts of X-ray imaging data may be obtained for the same subject.
  • FIG. 6 is a schematic view of a photographing unit viewed in a direction of a rotation axis thereof according to an embodiment of the present invention.
  • the imaging unit 202 includes first to third imaging units disposed at angular intervals of 120 degrees from each other, and each of the first to third X-ray detectors 212, 222, and 232 of the full beam size, and a matching agent corresponding thereto.
  • the first to third X-ray generators 211, 221, and 231 to irradiate the first to third X-ray beams 16B, 17B, and 18B, respectively.
  • the photographing unit 202 may finish the photographing sequence necessary for reconstructing the CT image through rotation of 60 degrees or more.
  • the number of imaging units having each of the X-ray generators and the X-ray detectors is not limited, and as the number of imaging units increases, the rotation angle required to perform the imaging sequence decreases accordingly. As a result, the time required for shooting is also reduced.
  • FIG. 7 is a schematic view of a photographing unit viewed in a direction perpendicular to a rotation axis thereof according to an embodiment of the present invention.
  • the plurality of photographing units may be arranged with different heights from each other.
  • a first imaging unit having a first generator 311 and a first detector 312 installed in one rotary arm 330, and a second generator 321 and a second detector 322
  • each of the X-ray beams when viewed in a direction perpendicular to the rotation axis C, each of the X-ray beams, that is, the first X-ray beam 14B and the second X-ray beam 24B, are at different heights. It can be arranged to transmit.
  • the trajectory of the first X-ray beam 14B and the trajectory of the second X-ray beam 24B may ideally overlap each other and may overlap each other in a narrow range.
  • the present invention relates to an X-ray CT imaging apparatus and a photographing method thereof, and may be used in a dental X-ray CT imaging apparatus.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Radiology & Medical Imaging (AREA)
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Abstract

La présente invention concerne un appareil de balayage de tomodensitométrie à rayons X qui est capable d'acquérir des données de balayage par rayons X nécessaires pour la reconstruction d'image de tomodensitométrie sur une courte durée sans accroître, au-delà d'une vitesse de rotation existante, la vitesse de rotation d'une unité de balayage de l'appareil de balayage de tomodensitométrie à rayons X. L'appareil de balayage de tomodensitométrie à rayons X selon la présente invention comprend : une première unité de balayage ayant un premier générateur pour l'exposition au rayonnement d'un premier faisceau de rayons X et un premier détecteur qui est disposé à l'opposé du premier générateur, avec une région à balayer et un axe de rotation entre eux, et qui reçoit le premier faisceau de rayons X ; et une seconde unité de balayage ayant un second générateur pour l'exposition au rayonnement d'un second faisceau de rayons X et un second détecteur qui est disposé à l'opposé du second générateur, avec la région à balayer et l'axe de rotation entre eux, et qui reçoit le second faisceau de rayons X, où lors de l'exécution d'une séquence de balayage, la première unité de balayage et la seconde unité de balayage sont entraînées à tourner simultanément autour de l'axe de rotation.
PCT/KR2018/003679 2017-03-28 2018-03-28 Appareil de balayage de tomodensitométrie à rayons x et son procédé de balayage Ceased WO2018182317A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20170039170 2017-03-28
KR10-2017-0039170 2017-03-28

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WO2018182317A1 true WO2018182317A1 (fr) 2018-10-04

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003116835A (ja) * 2001-10-18 2003-04-22 Toshiba Medical System Co Ltd Ｘ線コンピュータ断層撮影装置
JP2007037994A (ja) * 2005-06-30 2007-02-15 Toshiba Corp Ｘ線ｃｔ装置
JP2009540942A (ja) * 2006-06-22 2009-11-26 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ デュアルｘ線管ゲーティング
JP2011502679A (ja) * 2007-11-15 2011-01-27 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 三次元ｘ線画像における改良された画質のための可動式くさび
JP5226523B2 (ja) * 2005-10-27 2013-07-03 フィリップス デジタル マンモグラフィー スウェーデン アーベー Ｘ線撮像に関する方法および装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003116835A (ja) * 2001-10-18 2003-04-22 Toshiba Medical System Co Ltd Ｘ線コンピュータ断層撮影装置
JP2007037994A (ja) * 2005-06-30 2007-02-15 Toshiba Corp Ｘ線ｃｔ装置
JP5226523B2 (ja) * 2005-10-27 2013-07-03 フィリップス デジタル マンモグラフィー スウェーデン アーベー Ｘ線撮像に関する方法および装置
JP2009540942A (ja) * 2006-06-22 2009-11-26 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ デュアルｘ線管ゲーティング
JP2011502679A (ja) * 2007-11-15 2011-01-27 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 三次元ｘ線画像における改良された画質のための可動式くさび

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