WO2010150719A1 - X線撮影装置 - Google Patents
X線撮影装置 Download PDFInfo
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- WO2010150719A1 WO2010150719A1 PCT/JP2010/060424 JP2010060424W WO2010150719A1 WO 2010150719 A1 WO2010150719 A1 WO 2010150719A1 JP 2010060424 W JP2010060424 W JP 2010060424W WO 2010150719 A1 WO2010150719 A1 WO 2010150719A1
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- 230000004907 flux Effects 0.000 claims abstract description 27
- 238000003384 imaging method Methods 0.000 claims description 293
- 229910004613 CdTe Inorganic materials 0.000 claims description 6
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 17
- 238000013170 computed tomography imaging Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 210000002455 dental arch Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
- A61B6/035—Mechanical aspects of CT
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/027—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
- A61B6/4435—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure
- A61B6/4441—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure the rigid structure being a C-arm or U-arm
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
- A61B6/4452—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being able to move relative to each other
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
- A61B6/4464—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit or the detector unit being mounted to ceiling
-
- A61B6/51—
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/06—Diaphragms
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4208—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4476—Constructional features of apparatus for radiation diagnosis related to motor-assisted motion of the source unit
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/58—Testing, adjusting or calibrating apparatus or devices for radiation diagnosis
- A61B6/587—Alignment of source unit to detector unit
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
Definitions
- the present invention relates to an X-ray imaging apparatus, and more particularly to an X (X-ray tomography) tomographic image that can be obtained by using an inexpensive X-ray imaging means having a vertically long detection area in a relatively narrow range.
- the present invention relates to a line imaging apparatus.
- a CT imaging apparatus for dental treatment requires a large amount of image data, and thus a CT tomographic image is generally obtained using a two-dimensional sensor having a wide detection area.
- the panoramic imaging apparatus can acquire a panoramic tomographic image using a CCD (Charge Coupled Device) sensor having a vertically long detection area in a relatively narrow range.
- CCD Charge Coupled Device
- an X-ray imaging apparatus capable of acquiring CT tomographic images and panoramic tomographic images by switching between CT imaging and panoramic imaging is a two-dimensional sensor having a wide detection area.
- Patent Document 1 An X-ray imaging apparatus capable of acquiring CT tomographic images and panoramic tomographic images by switching between CT imaging and panoramic imaging is a two-dimensional sensor having a wide detection area.
- the present invention can acquire a CT tomographic image using an inexpensive X-ray imaging means having a vertically long detection area in a relatively narrow range, and is effective in reducing the cost. It is an object to provide an X-ray imaging apparatus that can contribute to the above.
- the present invention provides an X-ray source for irradiating a subject with an X-ray flux, an X-ray imaging means for detecting the X-ray flux that has passed through the subject, the X-ray source, and the X-ray imaging means.
- An X-ray imaging apparatus comprising: a support member that supports the X-ray source; and a turning unit that rotates the support member to turn the X-ray source and the X-ray imaging unit around the subject.
- An arc moving means for rotating the X-ray imaging means around an arc movement central axis disposed on a line connecting the X-ray imaging means, and moving the arc around the subject; the turning means; and the arc moving means
- a control device for controlling the operation of the X-ray, while the control device rotates the X-ray imaging means around the arc movement center axis by the arc movement means within a first arc movement range.
- imaging means A first imaging step for detecting the X-ray bundle transmitted through the subject, a shift turning step for turning the support member around the subject by the turning means, and the first arc by the shift turning step.
- the X-ray imaging unit While the X-ray imaging unit rotates the X-ray imaging unit around the arc movement center axis by the arc moving unit in a second arc moving range while being shifted by a minute angle from the moving range, the X-ray imaging unit moves the subject.
- a shift imaging step of detecting the transmitted X-ray flux, and a shift turning step and a shift imaging step are continuously executed following the shift imaging step.
- the arc moving means detects the X-ray bundle transmitted through the subject while moving the X-ray imaging means in an arc around the subject with the arc movement center axis as a rotation center.
- the arc moving means functions as a two-dimensional X-ray imaging means in the range moved by the arc.
- the X-ray bundle in the arc movement range can be functioned as a wide range two-dimensional X-ray imaging unit capable of detecting Can do.
- the CT tomographic image can be acquired by scanning the X-ray imaging unit that functions as a wide-range two-dimensional X-ray imaging unit while rotating around the subject.
- the present invention realizes an X-ray imaging apparatus that can obtain a CT tomographic image using an inexpensive X-ray imaging means having a vertically long detection area in a relatively narrow range. It can contribute to reduction effectively.
- the arc movement center axis is provided at a position where the X-ray source is provided.
- the X-ray source by moving the X-ray imaging unit in an arc around the X-ray source, the X-ray source is not moved in an arc, so that a stable X-ray bundle is irradiated and image blurring is suppressed. it can.
- the X-ray source is rotated in the moving direction of the X-ray imaging unit in conjunction with the arc movement of the X-ray imaging unit, a certain region of the X-ray bundle can be irradiated to the X-ray imaging unit.
- the subject can be irradiated with a uniform X-ray bundle without any variation.
- the X-ray imaging apparatus is an imaging apparatus capable of imaging a CT tomographic image
- the X-ray imaging means is a CCD sensor
- the first imaging step after the first imaging step. It is preferable that the shift imaging step executed in step 1 and the shift imaging step further executed after the shift imaging step detect the X-ray flux while rotating in the same direction.
- a CCD sensor can be applied as the X-ray imaging unit by detecting the X-ray bundle while rotating the X-ray imaging unit in the same direction in each imaging step.
- the X-ray imaging apparatus is an imaging apparatus capable of imaging a CT tomographic image
- the X-ray imaging means is a CMOS sensor or a CdTe sensor, and includes the first imaging step and the first imaging step.
- the shift imaging step executed after the imaging step the X-ray bundle is detected while rotating in opposite directions, and the shift imaging step and the shift imaging step further executed after the shift imaging step are also performed.
- the X-ray flux is detected while rotating in directions opposite to each other, and thus one imaging step and the other imaging steps executed after this one imaging step are opposite to each other. It is desirable to detect the X-ray flux while rotating in the direction.
- each imaging step one imaging step and the other imaging step executed after the one imaging step rotate the X-ray imaging unit in directions opposite to each other while rotating the X-ray imaging unit.
- a CMOS sensor or a CdTe sensor directly conversion type semiconductor detection element
- the turning means includes a turning arm and turning driving means for turning the turning arm, and the support member is pivotally supported by the arc movement central axis disposed on the turning arm.
- the arc moving arm is arranged on the turning arm, and the turning arm is rotated by the turning driving means to rotate the arc moving arm.
- the X-ray source and the X-ray imaging unit are rotated around the subject, and the arc moving arm is rotated by the arc moving unit to move the X-ray imaging unit around the subject. It is desirable to be configured as described above.
- the X-ray source and the X-ray imaging unit are disposed on the arc moving arm that is the support member, and the arc moving arm is pivotally supported on the arc moving central axis.
- the X-ray imaging unit is rotated around the subject by rotating the X-ray source and the X-ray imaging unit arranged around the subject by the turning unit and rotating the arc moving arm by the arc moving unit.
- the arc can be moved with.
- the X-ray imaging apparatus includes an XY table in which the support member is movable in a two-dimensional plane, and the X-ray imaging apparatus is an imaging apparatus capable of imaging a panoramic tomographic image.
- the X-ray source and the X-ray imaging unit are configured such that the support member that supports the X-ray source and the X-ray imaging unit can be moved in a two-dimensional plane by the XY table. Can be moved along a predetermined panoramic shooting trajectory. Therefore, the X-ray imaging apparatus can be used as a panoramic imaging apparatus that can acquire a panoramic tomographic image.
- a collimator for regulating the range of the X-ray bundle irradiated from the X-ray source is disposed so as to face the X-ray imaging unit with the subject interposed therebetween.
- the image quality can be improved by reducing the amount of scattered radiation by disposing the collimator that regulates the range of the X-ray flux.
- the arc moving means is configured to move the collimator and the X-ray imaging means in an arc while holding the X-ray source, the collimator, and the X-ray imaging means in a straight line. It is desirable.
- the X-ray source, the collimator, and the X-ray imaging unit are moved in a circular arc while being held in a straight line, thereby narrowing a certain region of the X-ray bundle with the collimator to the X-ray imaging unit. Since the irradiation can be performed, the subject can be efficiently irradiated with a uniform X-ray flux without any variation.
- the present invention also provides an X-ray source that irradiates a subject with an X-ray beam, an X-ray imaging unit that detects the X-ray beam transmitted through the subject, and a support member that supports the X-ray source and the X-ray imaging unit. And a turning means for turning the support member to turn the X-ray source and the X-ray imaging means around the subject, wherein the X-ray imaging means is linearly moved.
- a first imaging step for detecting the X-ray flux transmitted through the subject by the X-ray imaging means and a shift turning step for turning the support member around the subject by the turning means.
- the X-ray imaging means is moved within the second linear movement range by the linear movement means in a state shifted by a small angle from the first linear movement range by this shift turning step.
- the X-ray imaging means that has passed through the subject is detected while the X-ray imaging means is linearly moved by the linear movement means, thereby functioning as a two-dimensional X-ray imaging means in a linearly moved range.
- the present invention realizes an X-ray imaging apparatus capable of acquiring a CT tomographic image using an inexpensive X-ray imaging means having a vertically long detection area in a relatively narrow range, and is effective in reducing costs. Can contribute.
- the present invention also provides an X-ray source that irradiates a subject with an X-ray beam, an X-ray imaging unit that detects the X-ray beam transmitted through the subject, and a support member that supports the X-ray source and the X-ray imaging unit. And a turning means for turning the support member to turn the X-ray source and the X-ray imaging means around the subject, wherein the X-ray imaging means is moved in an arc or An X-ray moving means for linear movement; and a control device for controlling operations of the turning means and the arc moving means.
- the control device rotates the support member by the turning means, and the X-ray source and A first round imaging step of detecting the X-ray bundle transmitted through the subject by the X-ray imaging means while turning the X-ray imaging means around the subject, and the X-ray moving means by the X-ray moving means.
- the X-ray imaging means transmits the subject while the X-ray source and the X-ray imaging means are rotated around the subject by rotating the support member by the turning means while being shifted by a minute amount.
- a shift orbit imaging step for detecting the X-ray flux, and a shift movement step and a shift imaging step are continuously performed following the shift orbit imaging step.
- the shift movement step and the shift imaging step are continuously executed from the first round imaging step and the shift round imaging step, so that the position of the X-ray imaging unit in the first round imaging step is determined. Since the shift imaging step is continuously repeated while shifting by a minute amount, the X-ray imaging unit can function as a two-dimensional X-ray imaging unit in a range shifted a plurality of times.
- the present invention realizes an X-ray imaging apparatus capable of acquiring a CT tomographic image using an inexpensive X-ray imaging means having a vertically long detection area in a relatively narrow range, and is effective in reducing costs. Can contribute.
- the X-ray imaging apparatus can acquire a CT tomographic image by using an inexpensive X-ray sensor having a vertically long detection area in a relatively narrow range, and thus can effectively contribute to cost reduction. .
- FIG. 1 It is a schematic diagram which shows notionally the structure of the X-ray imaging apparatus which concerns on the 1st Embodiment of this invention, (a) is a front view, (b) is a side view. It is a principal part bottom view for demonstrating operation
- the structure of the arc moving means using a rotating disk is shown, (a) is a front view, and (b) is a bottom view.
- a dental X-ray imaging apparatus 1 includes an X-ray tube 11a that is an X-ray source 11, and an X-ray sensor 12 that is an X-ray imaging unit.
- the collimator 13 for regulating the range of the X-ray bundle L, the arc moving arm 2 as a support member for supporting the X-ray source and the X-ray imaging means, and the arc moving arm 2 are rotated around the arm rotation center axis C1.
- the turning means 3, the arc moving means 4 by a cam mechanism for moving the X-ray sensor 12 around the arc movement center axis C 2, the XY table 15 movable in a two-dimensional plane, the turning means 3 and the cam mechanism And a control device 8 for controlling the operation of the arc moving means 4.
- a control device 8 for controlling the operation of the arc moving means 4.
- the turning means 3 includes a turning arm 32 pivotally supported on the turning shaft 31 and a turning drive means 33 for turning the turning arm 32.
- the turning means 3 has a function of turning the X-ray tube 11 a and the X-ray sensor 12 around the subject K by rotating the arc moving arm 2.
- the X-ray imaging apparatus 1 rotates the arc moving arm 2 by turning the turning arm 32 by the turning drive means 33 made of a servo motor or the like, thereby rotating the X-ray source 11 and the X-ray sensor 12 to the subject K. And the arc moving arm 2 is rotated by the arc moving means 4 so that the X-ray sensor 12 can be moved in an arc with the subject K interposed therebetween.
- the X-ray source 11 includes an X-ray tube 11 a that irradiates a subject K with an X-ray bundle L as shown in FIG.
- the X-ray tube 11 a is disposed on a support member 11 b fixed downward from the arc moving arm 2. For this reason, the irradiation direction of the X-ray bundle L irradiated from the X-ray tube 11a changes with the rotation of the arc moving arm 2, and the X-ray sensor 12 also synchronizes to follow the irradiation direction of the X-ray bundle L. Move in an arc (see FIGS. 2A to 2C).
- the arc moving arm 2 is provided with a collimator 13 that regulates the range of the X-ray bundle L irradiated from the X-ray tube 11a.
- the collimator 13 detects the X-ray bundle L focused on the subject K through the subject K and is detected by the X-ray sensor 12 (see FIG. 2).
- the X-ray sensor 12 detects an X-ray bundle L that has passed through the subject K, and is vertically long in a CMOS sensor (see FIG. 5), a CCD sensor (see FIG. 6), a CdTe sensor, and other relatively narrow ranges (width is about 6 mm). It can be configured using an image sensor having a detection area.
- a CMOS sensor has a feature that it is inexpensive and consumes less power
- a CCD sensor has a feature that its resolution is high. Can do.
- the arc moving arm 2 is rotatably supported by a shaft member 21 disposed on the arc moving central axis C2.
- the arc movement central axis C ⁇ b> 2 is provided coaxially with the X-ray source 11 disposed on the arc movement arm 2.
- An X-ray source 11, a collimator 13, and an X-ray sensor 12 are linearly arranged on the arc moving arm 2. For this reason, since a certain area of the X-ray beam L irradiated from the X-ray source 11 can be focused by the collimator 13 and irradiated to the X-ray sensor 12, a uniform X-ray beam L always without variations can be efficiently and efficiently applied to the subject K. Can be irradiated.
- the arc moving means 4 by the cam mechanism includes a cam roller 42 connected to a servo motor 41 and rotatably supported, a cam groove 43 formed on the outer peripheral surface of the cam roller 42, And a cam pin 44 engaged so as to move along the groove 43.
- the cam pin 44 is fixed so as to protrude from the arc moving arm 2. Then, the arc moving means 4 by the cam mechanism is arranged on the turning arm 32 so that the cam pin 44 is engaged with the cam groove 43.
- the arc movement arm 2 rotates about the arc movement center axis C2, and the X-ray sensor 12 moves the arc movement range ⁇ (see FIG. 2). 2 (a)), the arc can be moved. That is, when the cam roller 42 is rotated, the cam pin 44 tries to move in a direction orthogonal to the arcuate moving arm 2. Due to the movement of the cam pin 44, the arc moving arm 2 moves between the position shown in FIG. 2 (a) and the position shown in FIG. 2 (c) around the shaft member 21 disposed on the arc moving central axis C2. The arc moves within (arc movement range ⁇ ).
- the cam pin 44 is positioned below the cam roller 42 and the arc moving arm 2 is positioned below the arc moving range in the drawing.
- the cam roller 42 is rotated 90 degrees in the right direction R (clockwise in FIG. 1A) from this position, the cam pin 44 moves along the cam groove 43 to the center position shown in FIG. 2 is also located in the center of the figure in the arc movement range ⁇ (FIG. 2B).
- the cam roller 42 is further rotated 90 degrees in the right direction R from the central position shown in FIG. 2B, the arc moving arm 2 moves upward in the arc moving range ⁇ shown in FIG. 2A. Move up.
- the X-ray imaging apparatus 1 uses the arc moving means 4 to move the X-ray bundle L that has passed through the subject K while moving the X-ray sensor 12 around the subject K in the arc moving range ⁇ . By detecting, it can function as a two-dimensional X-ray imaging means in the arc movement range ⁇ .
- a wide range of two-dimensional X-ray imaging means capable of detecting the X-ray bundle L in the arc movement range ⁇ by moving the X-ray sensor 12 having a vertically long detection area in a relatively narrow range of about 6 mm in width.
- a CT tomographic image can be acquired by scanning the X-ray sensor 12 functioning as a wide-range two-dimensional X-ray imaging means while rotating around the subject K by the turning means 3.
- the X-ray imaging apparatus 1 can acquire a CT tomographic image by using an inexpensive X-ray sensor 12 having a vertically long detection area in a relatively narrow range, which is effective in reducing costs. Can contribute.
- the XY table 15 is arranged so as to be movable in the X-axis direction so as to be orthogonal in the horizontal direction, and a straight line is provided so as to be movable in the Y-axis direction.
- the movement guide is combined. Since the XY table 15 is provided, the X-ray imaging apparatus 1 can translate the arc moving arm 2 in a two-dimensional plane in the horizontal direction via the turning means 3, so that a CT tomographic image and a panoramic tomographic image are obtained. Functions as a photographing device capable of photographing.
- CT imaging can be performed by fixing the XY table 15 and fixing the arm rotation center axis C1.
- the arc moving arm 2 and the turning arm 32 are integrated by the XY table 15 with the arc moving arm 2 fixed without moving the arc. By moving in parallel in the plane, panoramic photography is possible.
- an arc moving means 5 using a rotating disk is connected to a servo motor (not shown) pivotally supported by a turning arm 32 and this servo motor.
- a rotating shaft 51 and a rotating disk 52, a driving pin 53 disposed on the rotating disk 52, and a guide groove 54 formed in 2 'on the arcuate moving arm so that the driving pin 53 is engaged are provided. It is configured.
- the arc moving means 5 by the rotating disk 52 rotates the rotating disk 52 clockwise ⁇ 1 by ⁇ 1 so that the arc moving arm 2 ′ moves from the center position P0 to the upper side of the figure.
- the rotary disk 52 is rotated counterclockwise R2 by ⁇ 1 in the same manner, the arc moving arm 2 'moves from the center position P0 to the upper position P2 in the figure.
- FIG. 5 is a schematic plan view for explaining an operation when a CT tomographic image is taken using a CMOS sensor as an X-ray sensor.
- FIG. 6 is a schematic plan view for explaining the operation when a CT tomographic image is taken using a CCD sensor as the X-ray sensor.
- the CMOS sensor has a characteristic that the X-ray flux L can be detected in both directions even if it is rotated counterclockwise (advanced rotation) or clockwise (returned rotation) in FIG. For this reason, in the case of a CMOS sensor, like a continuous first imaging step and a second imaging step which is a shift imaging step, and a second imaging step and a third imaging step (shift imaging step). In the imaging steps performed successively, the rotation directions (forward rotation and reverse rotation) are opposite to each other.
- the X-ray imaging apparatus 1 advances and rotates counterclockwise within the first arc movement range ⁇ 1 (FIG. 5 ( a)), a shift turning step (FIG. 5 (b)) for turning and turning counterclockwise around the arm rotation center axis C1, and a shift imaging step for turning back clockwise in the second arc movement range ⁇ 2.
- a second imaging step (FIG. 5C), a second shift turning step for turning counterclockwise about the arm rotation center axis C1 (FIG. 5D), a third arc
- a third imaging step (FIG. 5 (e)), which is a shift imaging step for detecting the X-ray bundle L while proceeding and rotating in the movement range ⁇ 3, is sequentially executed.
- a shift turning step and a shift imaging step are successively executed.
- the respective imaging steps first imaging step, second imaging step, each of the arc movement ranges ⁇ 1, ⁇ 2,. ... until the n-th imaging step
- a CT tomographic image is captured.
- the X-ray is moved around the arc movement center axis C2 by the arc moving means 4 (FIG. 1) or the arc moving means 5 (FIG. 4).
- the X-ray bundle L passing through the subject K is detected by the X-ray sensor 12 while the sensor 12 is advanced and rotated within the first arc movement range ⁇ 1.
- the arc moving arm 2 is advanced counterclockwise by ⁇ around the arm rotation center axis C1 by the turning means 3 to rotate the X-ray source 11 and X
- the line sensor 12 is shifted around the subject K.
- the arc moving means 4 while being shifted from the first arc movement range ⁇ 1 by a minute angle ⁇ by the shift turning step (FIG. 5 (b)).
- the X-ray sensor 12 detects the X-ray bundle L that has passed through the subject K while rotating the X-ray sensor 12 around the arc movement center axis C ⁇ b> 2 back within the second arc movement range ⁇ ⁇ b> 2.
- the second shift turning step is the same as the shift turning step shown in FIG. 5 (b), as shown in FIG. 5 (d).
- the third imaging step is the same as the first imaging step shown in FIG.
- CMOS sensor In the present embodiment, as shown in FIG. 5, the case where a CMOS sensor is used has been described. However, even in the case of a CdTe sensor (direct conversion type semiconductor detection element), as in the CMOS sensor, it is counterclockwise. Even if it is rotated (advanced rotation) or rotated clockwise (returned rotation), the X-ray flux L can be detected in both directions, so that it can be used in the same embodiment as the CMOS sensor. By using the CdTe sensor, the detection efficiency of the X-ray flux L can be improved.
- CdTe sensor direct conversion type semiconductor detection element
- the CCD sensor has directionality in the moving direction, and has a characteristic that the X-ray flux L can be detected only in one direction. For this reason, the X-ray flux L is detected in the case where all imaging steps advance and rotate in the same direction, that is, counterclockwise. Therefore, it is configured to include a return step of rotating clockwise in the same arc movement range ⁇ in preparation for the next imaging step performed following the one imaging step.
- the X-ray imaging apparatus 1 performs a first imaging step of rotating counterclockwise within the first arc movement range ⁇ 11 (FIG. 6).
- A) a return step for rotating back clockwise in the same first arc movement range ⁇ 11 (FIG. 6 (b)), and a shift turning step for turning counterclockwise around the arm rotation center axis C1.
- a second imaging step (FIG. 6 (c)), which is a shift imaging step of rotating counterclockwise in the second arc movement range ⁇ 12, is executed sequentially.
- the shift turning step (FIG. 6 (b ′)) is executed after the return step (FIG. 6 (b)), but the present invention is not limited to this. Subsequent to the step (FIG. 6 (b ′)), a return step (FIG. 6 (b)) may be executed thereafter, and the return step (FIG. 6 (b ′)) is executed while the shift turning step (FIG. 6 (b ′)) is executed. 6 (b)) may be executed.
- a return step for further rotating back clockwise in the same second arc movement range ⁇ 12, and the arm rotation center axis C1.
- a shift turning step for making a turn in a counterclockwise direction around the center (FIG. 6 (b')).
- FIG. 7 is a schematic plan view for explaining the operation when the X-ray imaging apparatus according to the embodiment of the present invention is used as a panoramic imaging apparatus.
- the X-ray imaging apparatus 1 integrates the arc moving arm 2 and the turning arm 32 without driving the arc moving means 4, and the arc moving arm 2 and the turning arm 32 that are integrally driven are in a horizontal two-dimensional plane. Since the movable XY table 15 is provided, it can also be used as a panoramic photographing apparatus.
- the swivel axis 31 (FIG. 1) is enveloped by the XY table 15 so as to irradiate the X-ray bundles L1 to L6 perpendicularly to the dental arch.
- the X-ray source 11 and the X-ray sensor 12 are moved around the subject K (FIG. 1) around the arm rotation center axis C1 (FIG. 1) by the swiveling means 3 (FIG. 1) while moving along the axis C1 to C6. Turn.
- the present invention is not limited to the above-described embodiment, and can be implemented with appropriate modifications.
- the collimator 13 and the X-ray sensor 12 are linearly arranged on the arc movement arm 2 so that the arc movement arm 2 is arranged around the arc movement center axis C2.
- the present invention is not limited to this.
- the collimator 13 is moved in an arc by the arc moving means 61 and the X-ray sensor 12 is synchronized by the arc moving means 62.
- An X-ray imaging apparatus 1 ′ configured to be controlled and moved in a circular arc may be used. In FIG.
- the collimator 13 and the X-ray source 11 are integrally formed, the X-ray source 11 integrated with the collimator 13 is moved in an arc by an arc moving means 61, and the X-ray sensor 12 is moved in an arc. It is also possible to perform arc movement by controlling each so as to synchronize at 62.
- the arc movement center axis C2 is disposed in the X-ray source 11.
- the present invention is not limited to this, and is disposed on a line connecting the subject K and the X-ray sensor 12. be able to.
- the collimator 13 that regulates the range of the X-ray bundle L is arranged, but the present invention is not limited to this, and the present invention can be implemented without providing the collimator 13. it can.
- the X-ray source 11 is arranged on the arc moving arm 2 so that the X-ray source 11 rotates with the rotation of the arc moving arm 2 (FIG. 1A).
- the present invention is not limited to this, and the X-ray source 11 may be fixed to the swivel arm 32 as shown in FIG. That is, in another embodiment of the X-ray source 11, as shown in FIG. 9, a support member 11b 'is fixed to a turning arm 32, and an X-ray tube 11a is disposed on the support member 11b'.
- the arcuate moving arm 2 is rotatably supported with respect to the support member 11b '. With this configuration, even when the arc moving arm 2 is rotated by the arc moving means 4 to move the X-ray sensor 12 in an arc, the X-ray tube 11a does not rotate. Can be irradiated.
- the X-ray sensor 12 is moved in the arc by the arc moving means 4 and 5, but the present invention is not limited to this.
- the arc movement center axis C2 (FIG. 1A) It is also possible to set a distance far from the subject K.
- the linear moving means 400 instead of the arc moving means 4 and 5, the linear moving means 400 as shown in FIG. 10 is used. Therefore, an example in which the linear moving means 400 is applied to the X-ray imaging apparatus 100 according to the present invention will be described with reference to FIG.
- the X-ray imaging apparatus 100 when the linear moving unit 400 is applied regulates the range of the X-ray bundle L irradiated from the linear moving unit 400 that linearly moves the X-ray sensor 12 and the X-ray tube 11a.
- Linear movement means 500 for linearly moving the collimator 130.
- the linear moving means 400 and 500 are arranged on the turning arm 32, respectively.
- the configuration other than the linear moving means 400 and 500 is the same as that of the embodiment using the arc moving means 4 and 5 described above, and a detailed description thereof will be omitted.
- the linear moving means 400 includes a guide rail 401 disposed along a linearly moving direction, a holder 402 mounted so as to be reciprocally movable along the guide rail 401, a ball screw (not shown) that reciprocally moves the holder 402, and the like.
- the drive device can be configured. Since the configuration of the linear movement device 400 is not particularly limited, a detailed description thereof will be omitted.
- the linear moving means 500 that linearly moves the collimator 130 can also include a guide rail 501 and a holder 502.
- the linear moving means 400 and the linear moving means 500 move in synchronization with each other. (Refer to S2 'and S3' in FIG. 11).
- the linear movement unit 500 is provided.
- the present invention is not limited to this, and the collimator 130 may not be provided.
- the collimator 130 may be linearly moved even if the collimator 130 is provided.
- the linear moving means 500 may not be provided.
- FIG. 12 is only a modified control operation in the X-ray imaging apparatus 1 according to the first embodiment of the present invention, and other configurations such as the arc moving arm 2, the turning means 3, and the arc moving means 4 are the same. Therefore, major differences will be described, and descriptions of similar configurations will be omitted.
- the X-ray bundle L is detected by the arc moving means 4 while rotating within the first arc moving range ⁇ 1, and the first arc moving range ⁇ 1 is detected by the shift turning step by the turning means 3.
- the X-ray bundle L is detected while being rotated within the second arc movement range ⁇ 2 by the arc moving means 4 in this shifted state, and the X-ray bundle is swung 360 to 180 degrees while being sequentially shifted by the turning means 3. L was detected (see FIG. 5).
- the arc moving arm 2 (see FIG. 1) is rotated 360 degrees R1 (or 180 degrees) by the turning means 3.
- a first round imaging step for detecting the X-ray bundle L (see FIG. 12A) and a shift shifted by a minute amount ⁇ (see FIG. 12B) from the position of the X-ray sensor 12 in the first round imaging step.
- the arc moving arm 2 is rotated 360 degrees R1 of full recon (or 180 degrees of half recon) by the turning means 3 to obtain X-rays.
- This is a step of detecting the X-ray bundle L transmitted through the subject K by the X-ray sensor 12 while turning the source 11 and the X-ray sensor 12 around the subject K (see also FIG. 1).
- the arc moving arm 2 is rotated by the arc moving means 4 which is an X-ray moving means, and the X-ray sensor 12 is moved around the arc moving center axis C2. (Refer to FIG. 1), this is a step of shifting the X-ray sensor 12 with respect to the subject K by a minute amount ⁇ from the position of the X-ray sensor 12 in the first round imaging step.
- the shift orbit imaging step is the same as the first orbital imaging step in a state where the shift movement step is shifted by a minute amount ⁇ from the position of the X-ray sensor 12 in the first orbiting imaging step.
- the X-ray sensor 11 is rotated while the X-ray source 11 and the X-ray sensor 12 are rotated around the subject K by rotating the arc moving arm 2 by 360 degrees R2 of full recon (or 180 degrees of half recon) by the turning means 3.
- 12 is a step of detecting the X-ray bundle L that has passed through the subject K (see also FIG. 1).
- the magnitude of the minute amount ⁇ is appropriately set depending on the resolution of the CT tomographic image necessary for imaging, and the position of the X-ray sensor 12 in the first round imaging step and the X-ray sensor in the shift round imaging step. There may be a gap between the positions of the 12 positions, the positions may move side by side, or may be shifted so as to overlap.
- the control device 8 (FIG. 1) further includes the shift movement step and the shift imaging following the shift round imaging step, as shown in FIG. 12 (c). Steps are executed in succession. That is, the control device 8 (FIG. 1) sequentially shifts the X-ray sensor 12 by a minute amount ⁇ from the position of the X-ray sensor 12 in the first round imaging step to the N-th shift imaging step (overall). While the X-ray source 11 and the X-ray imaging sensor 12 are swung around the subject K by rotating the arc moving arm 2 360 degrees RN (or 180 degrees) by the swiveling means 3 while shifting the movement amount ⁇ ′). The X-ray bundle L transmitted through the subject K is detected by the line sensor 12.
- the X-ray sensor 12 is moved in a circular arc by the circular arc moving means 4, but the present invention is not limited to this, and the linear moving means 400 shown in FIG. (See FIG. 11).
Abstract
Description
そして、旋回手段により、広範囲な二次元X線撮像手段として機能するX線撮像手段を被写体の周りで旋回させながら走査することで、CT断層画像を取得することができる。
また、例えば、X線撮像手段の円弧移動に併せてX線源をX線撮像手段の移動方向に回転させれば、X線束の一定の領域をX線撮像手段に照射することができるため、常にばらつきのない均一なX線束を被写体に照射することができる。
このため、前記X線撮影装置をパノラマ断層画像が取得できるパノラマ撮影装置としても使用することが可能となる。
本発明の第1の実施形態に係る歯科用のX線撮影装置1は、図1に示すように、X線源11であるX線管11aと、X線撮像手段であるX線センサ12と、X線束Lの範囲を規制するコリメータ13と、X線源およびX線撮像手段を支持する支持部材である円弧移動アーム2と、この円弧移動アーム2をアーム回転中心軸C1の周りに回転させる旋回手段3と、円弧移動中心軸C2の周りにX線センサ12を円弧移動させるカム機構による円弧移動手段4と、二次元平面内で移動自在なXYテーブル15と、旋回手段3およびカム機構による円弧移動手段4の動作を制御する制御装置8と、を備えている。
なお、本実施形態においては歯科用に適用する場合について説明するが、これに限定されるものではなく、医療の分野等で広く適用することができる。
X線管11aは、円弧移動アーム2から下方に固定された支持部材11bに配設されている。このため、X線管11aから照射されたX線束Lの照射方向は、円弧移動アーム2の回転に伴って変化し、X線束Lの照射方向に追従するように同期しながらX線センサ12も円弧移動する(図2(a)~(c)参照)。
また、円弧移動アーム2には、X線管11aから照射されたX線束Lの範囲を規制するコリメータ13が配設されている。コリメータ13により、被写体Kには絞られたX線束Lが被写体Kを通過してX線センサ12で検出される(図2参照)。
例えば、CMOSセンサは、安価で電力消費が少ないという特徴を有し、CCDセンサは解像度が高いという特徴を有するため、X線撮影装置に要求される仕様に基づいて最適なイメージセンサを選択することができる。
円弧移動アーム2には、X線源11、コリメータ13、およびX線センサ12が直線状に配設されている。
このため、X線源11から照射されたX線束Lの一定の領域をコリメータ13で絞ってX線センサ12に照射することができるため、常にばらつきのない均一なX線束Lを効率よく被写体Kに照射することができる。
カムピン44は、円弧移動アーム2から突出するように固定されている。そして、カムピン44がカム溝43に係合されるように、カム機構による円弧移動手段4が旋回アーム32に配設されている。
つまり、カムローラ42を回転させるとカムピン44が円弧移動アーム2に直交する方向に移動しようとする。このカムピン44の移動により、円弧移動アーム2は、円弧移動中心軸C2に配設された軸部材21を中心として、図2(a)に示す位置と図2(c)に示す位置との間(円弧移動範囲δ)で円弧移動する。
また、図2(b)に示す中央位置から、カムローラ42をさらに右方向Rに90度回転させると、円弧移動アーム2は、図2(a)に示す円弧移動範囲δにおける本図上の上側まで移動する。
そして、旋回手段3により、広範囲な二次元X線撮像手段として機能するX線センサ12を被写体Kの周りで旋回させながら走査することで、CT断層画像を取得することができる。
XYテーブル15を備えたことで、X線撮影装置1は、旋回手段3を介して円弧移動アーム2を水平方向の二次元平面内で平行移動することができるため、CT断層画像およびパノラマ断層画像を撮影可能な撮影装置として機能する。
円弧移動手段の他の実施例に係る回転円盤による円弧移動手段5は、図4(a)に示すように、旋回アーム32に枢支された図示しないサーボモータと、このサーボモータに連結された回転軸51および回転円盤52と、回転円盤52に配設された駆動ピン53と、駆動ピン53が係合されるように円弧移動アームに2′に形成された案内溝54と、を備えて構成されている。
ここで、CCDセンサは、移動方向に方向性を有しており、一方向でのみX線束Lを検出できる特性を備えている。このため、すべての撮像ステップにおいて同じ方向、すなわち反時計回りに進み回転させる場合にX線束Lを検出する。したがって、一の撮像ステップに続いて行われる次の撮像ステップの準備のために同じ円弧移動範囲δで時計回りに戻し回転させる戻しステップを含んで構成されている。
X線撮影装置1は、円弧移動手段4を駆動させずに円弧移動アーム2と旋回アーム32とを一体とし、一体駆動する円弧移動アーム2と旋回アーム32とが水平方向の二次元平面内で移動自在なXYテーブル15を備えているため、パノラマ撮影装置としても使用することができる。
例えば、第1の実施形態に係るX線撮影装置1は、円弧移動アーム2にコリメータ13およびX線センサ12を直線状に配設して、円弧移動アーム2を円弧移動中心軸C2の周りに回転するように構成したが、これに限定されるものではなく、図8に示すように、コリメータ13を円弧移動手段61で円弧移動させ、X線センサ12を円弧移動手段62で同期するようにそれぞれ制御して円弧移動させるように構成したX線撮影装置1′としてもよい。
また、図8において、コリメータ13とX線源11とを一体として構成し、このコリメータ13が一体となったX線源11を円弧移動手段61で円弧移動させ、X線センサ12を円弧移動手段62で同期するようにそれぞれ制御して円弧移動させるようにすることもできる。
すなわち、X線源11の他の実施例は、図9に示すように、旋回アーム32に支持部材11b′を固定し、この支持部材11b′にX線管11aを配設したものである。そして、円弧移動アーム2は、支持部材11b′に対して回転自在に軸支されている。
かかる構成により、円弧移動手段4により、円弧移動アーム2を回転させてX線センサ12を円弧移動させた場合においても、X線管11aは回転しないため、X線源11から安定したX線束Lを照射することができる。
そこで、本発明に係るX線撮影装置100において、直線移動手段400を適用した場合の実施例について、図10を参照しながら説明する。
なお、本実施例において、直線移動手段400,500以外の他の構成については、前記した円弧移動手段4,5を使用した実施例と同様であるので詳細な説明は省略する。
なお、本実施例においては、直線移動手段500を備えて構成したが、これに限定されるものではなく、コリメータ130を設けなくてもよいし、コリメータ130を設けてもコリメータ130を直線移動させる直線移動手段500を設けなくてもよい。
図12は、本発明の第1の実施形態に係るX線撮影装置1における制御動作を改変したのみであり、円弧移動アーム2、旋回手段3、円弧移動手段4等の他の構成は同様であるので主要な相違点について説明し同様な構成における説明は省略する。
前記した第1の実施形態においては、円弧移動手段4により、第1の円弧移動範囲δ1で回転させながらX線束Lを検出し、旋回手段3によるシフト旋回ステップにより第1の円弧移動範囲δ1からずらした状態で、このずらした状態で円弧移動手段4により第2の円弧移動範囲δ2で回転させながらX線束Lを検出し、順次旋回手段3によりずらしながら360度ないし180度旋回させてX線束Lを検出するようにした(図5参照)。
つまり、制御装置8(図1)は、シフト移動ステップにより順次X線センサ12を微小量Δだけ、第1の周回撮像ステップにおけるX線センサ12の位置から第N回目のシフト撮像ステップまで(全体の移動量δ′)ずらしながら、旋回手段3により円弧移動アーム2を360度RN(ないし180度)回転させてX線源11およびX線撮像センサ12を被写体Kの周りで旋回させながら、X線センサ12により被写体Kを透過したX線束Lを検出する。
2,2′ 円弧移動アーム(支持部材)
3 旋回手段
4,5 円弧移動手段
8 制御装置
11 X線源
11a X線管
12 X線センサ(X線撮像手段)
13 コリメータ
15 XYテーブル
21 軸部材
31 旋回軸
32 旋回アーム
33 旋回駆動手段
41 サーボモータ
42 カムローラ
43 カム溝
44 カムピン
51 回転軸
52 回転円盤
53 駆動ピン
54 案内溝
61,62 円弧移動手段
80 制御装置
400 直線移動手段
C1 アーム回転中心軸
C2 円弧移動中心軸
K 被写体
L X線束
Claims (10)
- X線束を被写体に照射するX線源と、
前記被写体を透過した前記X線束を検出するX線撮像手段と、
前記X線源および前記X線撮像手段を支持する支持部材と、
この支持部材を回転させて前記X線源および前記X線撮像手段を前記被写体の周りで旋回させる旋回手段と、を有するX線撮影装置であって、
前記被写体と前記X線撮像手段とを結ぶ線上に配設された円弧移動中心軸の周りに前記X線撮像手段を回転させて前記被写体の周りで円弧移動させる円弧移動手段と、
前記旋回手段および前記円弧移動手段の動作を制御する制御装置と、を備え、
前記制御装置は、
前記円弧移動手段により前記円弧移動中心軸の周りに前記X線撮像手段を第1の円弧移動範囲で回転させながら、前記X線撮像手段により前記被写体を透過した前記X線束を検出する第1の撮像ステップと、
前記旋回手段により、前記支持部材を前記被写体の周りにシフト旋回させるシフト旋回ステップと、
このシフト旋回ステップにより前記第1の円弧移動範囲から微小角度だけずらした状態で、前記円弧移動手段により前記円弧移動中心軸の周りに前記X線撮像手段を第2の円弧移動範囲で回転させながら、前記X線撮像手段により前記被写体を透過した前記X線束を検出するシフト撮像ステップと、を含み、
前記シフト撮像ステップに続いて、さらにシフト旋回ステップと、シフト撮像ステップと、を連続して実行すること、
を特徴とするX線撮影装置。 - 前記円弧移動中心軸は、前記X線源が配設された位置に設けられていること、
を特徴とする請求の範囲第1項に記載のX線撮影装置。 - 前記X線撮影装置は、CT断層画像を撮影可能な撮影装置であり、
前記X線撮像手段は、CCDセンサであり、
前記第1の撮像ステップ、この第1の撮像ステップの後で実行される前記シフト撮像ステップ、および当該シフト撮像ステップの後でさらに実行されるシフト撮像ステップは、それぞれ同じ方向に回転させながら前記X線束を検出すること、
を特徴とする請求の範囲第1項または請求の範囲第2項に記載のX線撮影装置。 - 前記X線撮影装置は、CT断層画像を撮影可能な撮影装置であり、
前記X線撮像手段は、CMOSセンサまたはCdTeセンサであり、
前記第1の撮像ステップと、この第1の撮像ステップの後で実行される前記シフト撮像ステップでは、互いに逆の方向に回転させながら前記X線束を検出し、
前記シフト撮像ステップと、当該シフト撮像ステップの後でさらに実行されるシフト撮像ステップでも同様に、互いに逆の方向に回転させながら前記X線束を検出し、
このようにして、一の撮像ステップと、この一の撮像ステップの後で実行される他の撮像ステップとは、互いに逆の方向に回転させながら前記X線束を検出すること、
を特徴とする請求の範囲第1項または請求の範囲第2項に記載のX線撮影装置。 - 前記旋回手段は、旋回アームと、この旋回アームを旋回させる旋回駆動手段と、を有し、
前記支持部材は、前記旋回アームに配設された前記円弧移動中心軸に軸支された円弧移動アームからなり、
前記円弧移動アームを円弧移動させる前記円弧移動手段を前記旋回アームに配設して、
前記旋回駆動手段により前記旋回アームを旋回させることで、前記円弧移動アームを回転させて前記X線源および前記X線撮像手段を前記被写体の周りに回転させるとともに、
前記円弧移動手段により前記円弧移動アームを回転させることで、前記X線撮像手段を前記被写体の周りで円弧移動させるように構成されていること、
を特徴とする請求の範囲第1項または請求の範囲第2項に記載のX線撮影装置。 - 前記X線撮影装置は、前記支持部材を二次元平面内で移動自在なXYテーブルを備え、
前記X線撮影装置は、パノラマ断層画像を撮影可能な撮影装置であること、
を特徴とする請求の範囲第1項または請求の範囲第2項に記載のX線撮影装置。 - 前記X線源から照射されたX線の範囲を規制するコリメータが前記被写体を挟んで前記X線撮像手段と対向するように配設されていること、
を特徴とする請求の範囲第1項または請求の範囲第2項に記載のX線撮影装置。 - 前記円弧移動手段は、前記X線源と前記コリメータと前記X線撮像手段とを直線状に保持した状態で、当該コリメータおよびX線撮像手段を円弧移動させるように構成されていること、
を特徴とする請求の範囲第7項に記載のX線撮影装置。 - X線束を被写体に照射するX線源と、
前記被写体を透過した前記X線束を検出するX線撮像手段と、
前記X線源および前記X線撮像手段を支持する支持部材と、
この支持部材を回転させて前記X線源および前記X線撮像手段を前記被写体の周りで旋回させる旋回手段と、を有するX線撮影装置であって、
前記X線撮像手段を直線移動させる直線移動手段と、
前記旋回手段および前記直線移動手段の動作を制御する制御装置と、を備え、
前記制御装置は、
前記直線移動手段により前記X線撮像手段を第1の直線移動範囲で移動させながら、前記X線撮像手段により前記被写体を透過した前記X線束を検出する第1の撮像ステップと、
前記旋回手段により、前記支持部材を前記被写体の周りにシフト旋回させるシフト旋回ステップと、
このシフト旋回ステップにより前記第1の直線移動範囲から微小角度だけシフト旋回させてずらした状態で、前記直線移動手段により前記X線撮像手段を第2の直線移動範囲で移動させながら、前記X線撮像手段により前記被写体を透過した前記X線束を検出するシフト撮像ステップと、を含み、
前記シフト撮像ステップに続いて、さらにシフト旋回ステップと、シフト撮像ステップと、を連続して実行すること、
を特徴とするX線撮影装置。 - X線束を被写体に照射するX線源と、
前記被写体を透過した前記X線束を検出するX線撮像手段と、
前記X線源および前記X線撮像手段を支持する支持部材と、
この支持部材を回転させて前記X線源および前記X線撮像手段を前記被写体の周りで旋回させる旋回手段と、を有するX線撮影装置であって、
前記X線撮像手段を円弧移動または直線移動させるX線移動手段と、
前記旋回手段および前記円弧移動手段の動作を制御する制御装置と、を備え、
前記制御装置は、
前記旋回手段により前記支持部材を回転させて前記X線源および前記X線撮像手段を前記被写体の周りで旋回させながら、前記X線撮像手段により前記被写体を透過した前記X線束を検出する第1の周回撮像ステップと、
前記X線移動手段により、前記被写体に対して前記X線撮像手段を微小量だけ円弧移動または直線移動してシフト移動させるシフト移動ステップと、
このシフト移動ステップにより前記第1の周回撮像ステップにおける前記X線撮像手段の位置から前記微小量だけずらした状態で、前記旋回手段により前記支持部材を回転させて前記X線源および前記X線撮像手段を前記被写体の周りで旋回させながら、前記X線撮像手段により前記被写体を透過した前記X線束を検出するシフト周回撮像ステップと、を含み、
前記シフト周回撮像ステップに続いて、さらにシフト移動ステップと、シフト撮像ステップと、を連続して実行すること、
を特徴とするX線撮影装置。
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CN102413770B (zh) | 2014-06-25 |
KR20120015439A (ko) | 2012-02-21 |
EP2446822B1 (en) | 2019-05-08 |
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EP2446822A4 (en) | 2014-01-08 |
US8855262B2 (en) | 2014-10-07 |
KR101266893B1 (ko) | 2013-05-24 |
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US20120093284A1 (en) | 2012-04-19 |
CN102413770A (zh) | 2012-04-11 |
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