WO2021172751A1 - Appareil de tomodensitométrie à faisceau conique équipé d'un collimateur à commande dynamique - Google Patents

Appareil de tomodensitométrie à faisceau conique équipé d'un collimateur à commande dynamique Download PDF

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Publication number
WO2021172751A1
WO2021172751A1 PCT/KR2021/000517 KR2021000517W WO2021172751A1 WO 2021172751 A1 WO2021172751 A1 WO 2021172751A1 KR 2021000517 W KR2021000517 W KR 2021000517W WO 2021172751 A1 WO2021172751 A1 WO 2021172751A1
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WO
WIPO (PCT)
Prior art keywords
collimator
rotator
rays
area
control unit
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Application number
PCT/KR2021/000517
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English (en)
Korean (ko)
Inventor
정홍
Original Assignee
주식회사 에이치디엑스윌
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Publication of WO2021172751A1 publication Critical patent/WO2021172751A1/fr

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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
    • A61B6/06—Diaphragms
    • 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]
    • 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
    • A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4035—Arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter or grating
    • 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
    • A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4064—Arrangements for generating radiation specially adapted for radiation diagnosis specially adapted for producing a particular type of beam
    • A61B6/4085—Cone-beams
    • 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
    • A61B6/54—Control of apparatus or devices for radiation diagnosis

Definitions

  • the present invention relates to a cone-beam CT apparatus having a collimator capable of dynamic control, and more particularly, to a cone-beam CT apparatus that eliminates the need to move the rotational center of a rotator to a central position of an area to be photographed during cone-beam CT imaging. will be.
  • Cone-beam CT uses an area detector to detect cone-shaped transmitted X-rays two-dimensionally, and uses this to acquire three-dimensional volume information, so that three-dimensional and multi-dimensional images can be reconstructed with only one rotational scan of a subject. am.
  • cone-beam CT an area capable of reconstructing a 3D image from data obtained through rotational scan is defined as a field of view (FOV), and the shape and size of the FOV is determined according to the geometric arrangement of the X-ray beam and the rotation axis.
  • FOV field of view
  • the maximum FOV the maximum area that can be diagnosed by one rotation imaging using cone beam CT
  • the subject can be photographed according to the maximum FOV of the cone beam CT.
  • the rotator 3 in order to implement cone beam CT, the rotator 3 is disposed so that the rotating center 4 is located at the center of the area to be imaged, and the rotator 3 ) is to arrange the X-ray generator 1 and the X-ray detector 2 in opposite directions and place the subject to be photographed between them, so that the maximum FOV photographing and restoration area 6 is more than 360° or 180°. It rotates to a slightly larger angle and shoots.
  • FIGS. 1(a) and (b) are diagrams showing the implementation of the conventional pre-FOV method in FIGS. 1(a) and (b), respectively.
  • the conventional pre-FOV method places the rotating center 4 in the center of the pre-FOV photographing and restoration area 7 to be photographed, and in the other areas After adjusting and fixing the collimator 5 so that the X-rays do not reach, the rotator 3 is rotated to proceed with shooting.
  • the center of the rotating center 4 and the photographing and restoration area 7 coincides with each other. Only a specific portion of the X-ray detection unit 2 is irradiated with X-rays. However, in this case, the problem of deterioration of the X-ray detection unit 2 occurs, and it becomes difficult to photograph a subject while using most of the range of the X-ray detection unit 2 .
  • the collimator 5 is fixed and the rotator 3 is rotated to use most of the range of the X-ray detection unit 2, since the rotating center 4 must move, the As the turning radius increases, the cone beam CT equipment becomes larger.
  • the scale of cone beam CT is quite large compared to the subject, and in institutions such as hospitals using cone beam CT, the small cone beam CT is preferred because the X-ray imaging room is very narrow.
  • An object of the present invention is to dynamically control the collimator for each angle at which data of the selected detection area is obtained when the rotator rotates during cone beam CT imaging, so that the rotation center of the rotator does not need to be moved to the center position of the area to be photographed.
  • An object of the present invention is to provide a cone-beam CT device that can be miniaturized.
  • the present invention for solving the above problems is a cone beam CT apparatus having a collimator capable of dynamic control, the apparatus of the present invention comprising: an X-ray generator for emitting cone-beam X-rays toward a subject; a collimator for limiting the irradiation area of X-rays through the opening so that the X-rays emitted from the X-ray generator can be irradiated only to the selected imaging area; an X-ray detection unit irradiated through the collimator and detecting X-rays passing through the subject; and a rotator in which the X-ray generator, the collimator, and the X-ray detector are disposed in a longitudinal direction.
  • control unit for controlling the driving of the collimator and rotating the rotator with respect to a rotation center
  • control unit has a center of the selected imaging area spaced apart from a rotation center of the rotator and when the rotator rotates, the selected The position of the opening of the collimator may be adjusted so that only the imaging area can be irradiated with X-rays.
  • the controller may differently adjust the opening position of the collimator according to the rotation angle of the rotator.
  • the controller may rotate the rotator in a state in which the positions of the center of the selected photographing area and the rotation center of the rotator are respectively fixed.
  • the collimator includes first and second plates, and the control unit may move the first and second plates in one direction perpendicular to the radial direction of X-rays.
  • the first and second plates when the rotator rotates, when the selected imaging area is biased to the right of the maximum FOV imaging and restoration area based on the X-ray generator, the first and second plates may be moved to the left when the selected imaging region is biased toward the left of the maximum FOV imaging and restoration region based on the X-ray generator.
  • the collimator may be formed of four rectangular-shaped plates positioned above, below, left, and right, respectively, with respect to the traveling direction of X-rays radiated from the X-ray generator.
  • the opening position of the collimator is continuously changed during the rotation of the rotator, so that the rotational center of the rotator is adjusted. Since there is no need to move to the central position of the area to be photographed, the device can be miniaturized.
  • FIGS. 1(a) and (b) are diagrams showing the implementation of the conventional pre-FOV method in FIGS. 1(a) and (b), respectively.
  • FIG. 3 is a block diagram showing a generally large cone beam CT.
  • FIG. 4 is a block diagram showing a schematic configuration of a cone beam CT apparatus having a collimator capable of dynamic control according to an embodiment of the present invention.
  • the X-ray irradiation direction according to the dynamic control of the collimator is a view viewed from the top of the rotator .
  • FIGS. 7A and 7B are diagrams exemplarily illustrating a collimator capable of dynamic control according to an embodiment of the present invention.
  • FIGS. 8A and 8B are diagrams illustrating detection images obtained through a cone beam CT apparatus having a collimator capable of dynamic control according to an embodiment of the present invention.
  • FIG. 4 is a block diagram showing a schematic configuration of a cone beam CT apparatus having a collimator capable of dynamic control according to an embodiment of the present invention. 5 and 6, respectively, in the cone beam CT apparatus according to the embodiment of the present invention, when the rotator 40 is positioned at 0 ° and 90 °, the X-ray irradiation direction according to the dynamic control of the collimator 20 rotator It is a view seen from the top of (40).
  • the cone beam CT apparatus includes an X-ray generator 10 , a collimator 20 , an X-ray detector 30 , a rotator 40 , and a controller 50 . do.
  • the X-ray generator 10 is an X-ray generator that generates X-rays in the form of a cone-beam toward a subject. 10) passes through the collimator 20 at the X-ray focus point and is incident on the X-ray detector 30 .
  • the collimator 20 may limit the irradiation area of the X-rays through the opening 21 so that the X-rays emitted from the X-ray generator 10 can be irradiated only to the selected imaging area 60 .
  • the opening position or range of the collimator 20 may be adjusted by the control unit 50 for each photographing position for each rotation angle.
  • the selected photographing area 60 is a partial area to be photographed among the subjects.
  • the free FOV method which is a technique necessary to photograph a small area as needed with the maximum FOV in one device, It corresponds to the free FOV shooting and restoration area.
  • the photographing area 60 selected together with the subject may be fixed.
  • the collimator 20 may include first and second plates 201 and 202 formed on both sides with the opening 21 therebetween.
  • the first plate 201 may be disposed on the right side when viewed from the X-ray generator 10
  • the second plate 202 may be disposed on the left side when viewed from the X-ray generator 10 .
  • the shape of the opening 21 of the collimator 20 may be set in various shapes according to the configuration of the collimator 20 , and the detailed configuration of the collimator 20 will be described later.
  • the X-ray detector 30 may detect X-rays irradiated through the collimator 20 and transmitted through the subject.
  • the X-ray detection unit 30 has a detection area 31 formed to have a predetermined length in the direction perpendicular to the X-ray irradiation direction.
  • the selected detection area 31 in the free FOV method applied to the present invention corresponds to a part of the maximum detection area of the entire X-ray detector because X-rays are irradiated through the collimator 20 . Also, referring to FIGS. 5 and 6 , the selected detection area 31 may correspond to different positions among the detection areas of the entire X-ray detector according to the photographing direction of the subject.
  • the data received from the X-ray detector 30 is transmitted to the image processing unit 32 , and the image processing unit 32 may reconstruct a 3D image from the data.
  • the X-ray generator 10 , the collimator 20 , and the X-ray detector 30 are disposed in the longitudinal direction.
  • the X-ray generator 10 , the collimator 20 , and the X-ray detector 30 may be directly or indirectly connected to the rotator 40 located thereon, respectively.
  • the X-ray generator 10 , the collimator 20 , and the X-ray detector 30 may be sequentially arranged in a straight line in the longitudinal direction of the rotator 40 .
  • the rotation driving unit 41 rotates the rotator 40 once with respect to the rotation center (C r ) after fixing the subject while the scanning process using the cone beam CT device is in progress.
  • One rotation means, for example, rotating the selected photographing area 60 at an angle slightly larger than 360° or 180°.
  • the rotator 40 may rotate once with respect to the rotation center (C r ) for each photographing by the rotation driving unit 41 , and not only forward rotation but also reverse rotation is possible.
  • the X-ray generator 10 , the collimator 20 , and the X-ray detector 30 interlocked with the rotator 40 also rotate.
  • the control unit 50 dynamically controls the driving of the collimator 20 , and may rotate the rotator 40 with respect to the rotation center C r . That is, the control unit 50 may adjust the opening position of the collimator 20 , and may drive the rotation driving unit 41 to rotate the rotator 40 . As described above, since the rotator 40 is interlocked with the collimator 20 , when the control unit 50 rotates the rotator 40 , the collimator 20 is also rotated.
  • the control unit 50 controls the center (C f ) of the selected imaging area to be spaced apart from the rotation center of the rotator 40, and when the rotator 40 rotates, a collimator ( 20) this opening position can be adjusted.
  • the control unit 50 may move the first and second plates 201 and 202 together in one direction perpendicular to the radial direction of X-rays.
  • the controller 50 may differently adjust the opening position of the collimator 20 according to the rotation angle of the rotator 40 so that only the selected imaging area 60 is exposed to X-rays. As the opening position of the collimator 20 is adjusted, the selected detection area 31 to which the X-rays reach also varies according to the rotation angle of the rotator 40 .
  • the selected imaging area 60 is on the right side of the maximum FOV imaging and restoration area 6 when viewed from the X-ray generator 10 .
  • the collimator 20 is controlled so that the X-rays can be irradiated to the selected imaging area 60 on the right side.
  • the opening position is adjusted by (50).
  • the controller 50 may move the first and second plates 201 and 202 to the right to direct the radiated X-rays to match the range of the selected imaging area 60 on the right. At this time, the first and second plates 201 and 202 move together to the right.
  • the object is detected through the X-rays irradiated to the selected detection area 31 on the right side, which is a part of the maximum detection area of the X-ray detection unit 30 .
  • the opening position is adjusted by the control unit 50 so that X-rays can be irradiated.
  • the controller 50 may move the first and second plates 201 and 202 to the left to direct the radiated X-rays to match the range of the selected imaging area 60 on the left. At this time, the first and second plates 201 and 202 move together to the left.
  • the object is detected through the X-rays irradiated to the left selected detection area 31 which is a part of the maximum detection area of the X-ray detector 30 .
  • the collimator 20 controls the X-rays to be irradiated to the selected imaging area 60 .
  • the opening position can be adjusted by (50). In addition, this is applicable even when the selected imaging area 60 has at least two coordinates of top, bottom, left, and right on a two-dimensional plane in the direction in which the X-rays are irradiated at the same time.
  • the selected photographing area 60 of the subject exists within the maximum FOV photographing and restoration area 6
  • the rotation center (C r ) of the rotator 40 is the center of the selected photographing area (C f ) and spaced apart.
  • the controller 50 may rotate the rotator 40 while the positions of the center C f of the selected imaging area and the rotation center C r of the rotator 40 are fixed, respectively. That is, even when the rotator 40 rotates, the position of the center (C f ) of the selected imaging area with respect to the rotation center (C r ) of the rotator does not change.
  • the center (C f ) of the selected imaging area and the center of rotation (C r ) of the rotator are fixed, respectively, so that X-rays can be irradiated only to the selected imaging area 60. Since the opening position of 20 is adjusted, the rotation radius of the rotator 40 does not change. Accordingly, miniaturization of the cone beam CT apparatus can be achieved.
  • 7A and 7B are diagrams exemplarily illustrating a collimator capable of dynamic control according to an embodiment of the present invention.
  • 8A and 8B are diagrams illustrating detection images obtained through a cone beam CT apparatus having a collimator capable of dynamic control according to an embodiment of the present invention.
  • the collimator 20 of the cone beam CT apparatus has an image centering on the traveling direction of X-rays radiated from the X-ray generator 10, It may be formed of four rectangular-shaped plates 22 positioned on the lower, left, and right sides.
  • the first and second plates 201 may be opposite two plates among the four plates 22 .
  • the control unit 50 may dynamically control each of the plates 22 .
  • Each plate 22 may be moved in a direction selected from among up, down, left, and right along a plurality of axes 23 and rails 24 extending in a horizontal or vertical direction by the control unit 50 .
  • Each shaft 22 receives rotational power through a motor, and a screw groove portion may be formed on an outer peripheral surface of the shaft 22 .
  • Each plate 22 includes an extension plate 221 extending toward one axis 23 , and an enclosure-type moving part 222 having a hollow body may be formed at an end of the extension plate 221 .
  • the moving part 222 is fitted to each shaft 23 , and can move horizontally or vertically along the shaft 23 .
  • a threaded portion is formed on the inner peripheral surface of the moving part 222 of the housing type, and may be engaged with the outer peripheral surface of the shaft 22 .
  • the upper and lower plates may move up and down along an axis extending in a vertical direction, and the left and right plates may move left and right along an axis extending in a horizontal direction.
  • the upper and lower plates may move toward or away from each other in a vertical direction, and the left and right plates may move toward or away from each other in a horizontal direction.
  • control unit 50 may narrow the opening range of the collimator while moving the position of each plate 22 shown in FIG. 7(a) to the position of FIG. 7(b), and vice versa. case is possible.
  • the configuration for adjusting the opening range of the collimator is shown as an example in (a) and (b) of FIG. 7 , the configuration is not limited thereto, and for example, the upper and lower plates, or the left and right plates are set in the same direction. It is also possible to adjust the opening position of the collimator while moving.
  • the user adjusts the aperture range of the collimator to photograph the first selected photographing area 60 through the control unit 50, and then automatically positions the collimator's opening to photograph only the selected photographing area 60 according to the rotation of the rotator 40 can be set to adjust.
  • the control unit 50 determines that the selected imaging area 60 is biased to the left or right of the maximum FOV imaging and restoration area 6 based on the X-ray generator 10 .
  • the left and right plates can be moved together to the left or right, respectively.
  • the control unit 50 rotates the rotator 40, the selected imaging area 60 is biased toward the upper or lower side of the maximum FOV imaging and restoration area 6 with respect to the X-ray generator 10,
  • the upper and lower plates can be moved together upwards or downwards, respectively.
  • the movements of the left and right plates and the upper and lower plates may be performed individually or simultaneously.
  • the center (C f ) of the selected imaging area 60 and the rotation center (C r ) of the rotator are respectively Filming may proceed in a fixed state.
  • the position of the detection region 31 of the X-ray detection unit 30 changes during imaging, most of the area of the X-ray detection unit 30 can be irradiated with X-rays according to one rotation of the rotator 40 . have.
  • the collimator 20 partially blocks the X-rays emitted from the X-ray generator 10 , so that the X-ray detection unit It can be seen that the image area obtained in (30) is narrowed.
  • the collimator when the rotator rotates during cone beam CT imaging, automatically and dynamically controls the collimator for each angle at which data of the selected detection area is obtained to continue the aperture range of the collimator during rotation of the rotator. By changing it, it is not necessary to move the rotational center of the rotator to the central position of the area to be photographed, and thus the device can be miniaturized.

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Abstract

La présente invention concerne un appareil de tomodensitométrie à faisceau conique équipé d'un collimateur à commande dynamique. L'appareil de la présente invention comprend : une unité de génération de rayons X pour irradier des rayons X en forme de faisceau conique vers un sujet ; un collimateur qui limite la zone d'irradiation des rayons X à travers une partie d'ouverture de telle sorte que les rayons X irradiés à partir de l'unité de génération de rayons X sont émis uniquement vers une zone de capture d'image sélectionnée ; une unité de détection de rayons X pour détecter les rayons X qui sont émis à travers le collimateur et passent à travers le sujet ; un rotateur sur lequel l'unité de génération de rayons X, le collimateur et l'unité de détection de rayons X sont agencés dans une direction longitudinale ; et une unité de commande qui commande le fonctionnement du collimateur et fait tourner le rotateur autour d'un centre de rotation. L'unité de commande peut commander la position d'ouverture du collimateur de telle sorte que les rayons X sont émis uniquement vers la zone de capture d'image sélectionnée lorsque le rotateur tourne tandis que le centre de la zone de capture d'image sélectionnée est espacé du centre de rotation du rotateur.
PCT/KR2021/000517 2020-02-27 2021-01-14 Appareil de tomodensitométrie à faisceau conique équipé d'un collimateur à commande dynamique WO2021172751A1 (fr)

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KR10-2020-0024419 2020-02-27
KR1020200024419A KR20210109304A (ko) 2020-02-27 2020-02-27 동적 제어가 가능한 콜리메이터를 구비한 콘빔 ct 장치

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101076319B1 (ko) * 2011-03-29 2011-10-26 주식회사 윌메드 동적 제어가 가능한 시준기를 구비한 콘빔 ｃｔ 장치
JP6053772B2 (ja) * 2011-07-04 2016-12-27 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． Ｘ線イメージング装置のスキャン運動を適合させる
JP2019005312A (ja) * 2017-06-27 2019-01-17 ゼネラル・エレクトリック・カンパニイ 放射線撮影装置、撮影方法及び制御プログラム
JP2019015540A (ja) * 2017-07-04 2019-01-31 キヤノン電子管デバイス株式会社 Ｘ線撮影装置、ｘ線撮影方法、およびコリメータ
JP6545353B2 (ja) * 2015-07-14 2019-07-17 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． 変調されたｘ線放射による撮像

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101076319B1 (ko) * 2011-03-29 2011-10-26 주식회사 윌메드 동적 제어가 가능한 시준기를 구비한 콘빔 ｃｔ 장치
JP6053772B2 (ja) * 2011-07-04 2016-12-27 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． Ｘ線イメージング装置のスキャン運動を適合させる
JP6545353B2 (ja) * 2015-07-14 2019-07-17 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． 変調されたｘ線放射による撮像
JP2019005312A (ja) * 2017-06-27 2019-01-17 ゼネラル・エレクトリック・カンパニイ 放射線撮影装置、撮影方法及び制御プログラム
JP2019015540A (ja) * 2017-07-04 2019-01-31 キヤノン電子管デバイス株式会社 Ｘ線撮影装置、ｘ線撮影方法、およびコリメータ

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