JP2013009819A - X-ray ct device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray CT device having a thin frame with an opening of a large diameter.SOLUTION: The X-ray CT device sets a subject through the opening of the frame in a direction of the subject's body, rotates an X-ray tube and an X-ray detection part, which are opposedly arranged at the center of the opening, around the subject, acquires a photographed image based on the X-ray that is emitted from the X-ray tube, transmits through the subject, and is detected by the X-ray detection part, and includes a rotation ring and a bearing. The rotation ring is formed to be ring-shaped so as to extend along the opening's circumferential direction and are provided with the X-ray tube and the X-ray detection part on an inner peripheral surface of the same. The bearing is provided between the outer peripheral surface side of the rotation ring and the frame, and supports the rotation ring so as to rotate it in a circumferential direction of the opening.

Description

  In an embodiment of the present invention, an X-ray tube and an X-ray detector are rotated around the body axis of the subject, irradiated from the X-ray tube, transmitted through the subject, and detected by the X-ray detector. The present invention relates to an X-ray CT apparatus that acquires a captured image based on the above.

  The X-ray CT apparatus has a gantry, and the gantry is provided with an opening (dome) for passing the subject in the body axis direction (for example, Patent Document 1).

When X-ray imaging is performed, the subject is passed through the opening, and the subject is irradiated with light from the projector. The operator accesses the subject through the opening and aligns the subject so that the light is irradiated to a predetermined position of the subject.

  When aligning the subject, the operator becomes easier to access the subject as the gap between the subject and the opening is larger. Therefore, it is preferable that the opening has a large diameter. A typical X-ray CT apparatus has a large aperture of about 800 [mm].

  When aligning the subject, the head of the subject is located at the back of the opening. For this reason, it is difficult to see the light emitted from the projector to the head, and it is difficult to align the head. In addition, when performing a puncture operation on the head, the operation tool is operated at a position where the opening is deep, making operation difficult. A general X-ray CT apparatus gantry has a length (thickness) of about 1000 [mm] from the front to the back.

  If the opening has a large diameter, head alignment and puncture operation are not difficult, and X-ray imaging can be facilitated. Further, if the thickness of the pedestal is reduced, the head of the subject does not become a position behind the entrance of the opening, and the head alignment and puncture operation are facilitated.

  Therefore, in order to facilitate X-ray imaging, there is a demand for an X-ray CT apparatus having a thin frame with a large aperture.

JP 2009-160468 A

  However, in the conventional X-ray CT apparatus, there are the following problems in order to provide a gantry with a large-diameter opening and make it thin.

  A rotating base is accommodated in the gantry. An X-ray tube and an X-ray detection unit are arranged opposite to the rotation base. A bearing is provided on the inner peripheral side of the rotary base. The rotation base is supported by the mount so as to rotate by the bearing. As described above, since the bearing is provided on the inner peripheral side of the rotation base, there is a problem that the aperture diameter is reduced by the amount of the bearing, which hinders the opening from being made large.

  Further, X-rays irradiated from the X-ray tube are irradiated to a predetermined irradiation field by a diaphragm. The bearing is arranged on the front side or the back side of the rotation base so that the bearing does not enter the irradiation field. Since the bearing is arranged on the front side or the back side of the rotating base, the thickness of the pedestal increases by the amount of the bearing, which causes a problem when the pedestal is made thin.

  This embodiment solves the above-described problem, and an object thereof is to provide an X-ray CT apparatus having a thin gantry provided with a large-diameter opening.

  In order to solve the above-described problems, an X-ray CT apparatus according to an embodiment passes an object through the opening of a gantry in the body axis direction, and an X-ray tube and an X-ray detection unit that are arranged to face each other at the center of the opening. A photographed image is acquired based on the X-rays rotated around the body axis, irradiated from the X-ray tube, transmitted through the subject and detected by the X-ray detector, and have a rotating ring and a bearing. The rotating ring is formed in a ring shape along the circumferential direction of the opening, the rotating ring in which the X-ray tube and the X-ray detection unit are provided on the inner peripheral surface side, the bearing, the outer peripheral surface side of the rotating ring and the mount The rotating ring is supported so as to rotate in the circumferential direction of the opening.

1 is a perspective view of an X-ray CT apparatus according to an embodiment. It is sectional drawing which fractured | ruptured and showed a part of rotation ring and a fixed ring. It is sectional drawing of a stand. It is sectional drawing of a shaft member. It is a perspective view of an X-ray CT apparatus when the inclination of a gantry is made into the angle which fell almost horizontally. It is a conceptual diagram of the X-ray CT apparatus shown in FIG. It is a side view of a mount. It is a front view of a mount. It is a perspective view of an X-ray CT apparatus when the gantry is tilted substantially horizontally and moved to a low position. It is a conceptual diagram of the X-ray CT apparatus shown in FIG. It is a figure which shows a mode that the nurse approached the head of the subject. It is a figure which shows the state of puncture surgery.

  Next, various embodiments of the X-ray CT apparatus will be described with reference to the drawings.

[First Embodiment]
An X-ray CT apparatus according to the first embodiment will be described with reference to FIGS. 1 and 2.
FIG. 1 is a perspective view of an X-ray CT apparatus. As shown in FIG. 1, an X-ray CT apparatus 1 includes an opening 1a for passing a subject in the body axis direction, and an X-ray tube 2 and an X-ray detector 3 that are arranged to face each other with the opening 1a interposed therebetween. Have. A captured image is acquired based on the X-rays irradiated from the X-ray tube 2 and transmitted through the subject and detected by the X-ray detector 3. In the following description, the horizontal direction orthogonal to the body axis direction may be referred to as the X direction, the vertical direction and the height direction may be referred to as the Y direction, and the body axis direction (thickness direction) may be referred to as the Z direction. The X direction to the Z direction are shown in FIG.

  The X-ray CT apparatus includes a gantry 10 having an opening 1a formed at the center thereof, a rotating ring 20, a fixing ring 30, and a stand 40.

(Frame)
The gantry 10 accommodates a rotating ring 20 and a fixed ring 30. The rotating ring 20 rotates relative to the fixed ring 30, and the fixed ring 30 is provided integrally with the gantry 10.

  Depending on the arrangement of the rotary ring 20 and the fixed ring 30, the thickness of the gantry 10 (length in the Z direction) and the diameter of the opening 1 a are changed. In order to obtain a gantry 10 which is thin and has a large-diameter opening 1a, the rotating ring 20, the fixing ring 30 and the like are configured as follows.

(Rotating ring)
The rotating ring 20 will be described with reference to FIGS. 1 and 2.
The rotating ring 20 is formed in a ring shape along the circumferential direction of the opening 1a. An X-ray tube 2 and an X-ray detector 3 are provided on the inner peripheral side of the rotating ring 20.

  FIG. 2 is a cross-sectional view showing a part of the rotating ring 20 and the fixed ring 30 in a broken state. As shown in FIG. 2, a bearing 21 for supporting the rotating ring 20 on the fixed ring 30 so as to rotate in the circumferential direction of the opening 1a is provided.

  The bearing 21 is disposed on the outer peripheral side of the rotating ring 20 (see FIG. 2). The outer peripheral side of the rotating ring 20 refers to the side opposite to the center side of the opening 1a with respect to the position where the X-ray tube 2 and the X-ray detector 3 are provided. By disposing the bearing 21 at such a position, the bearing 21 does not become an obstacle when the opening 1a has a large diameter.

  The bearing 21 is disposed in the diameter direction (Y direction) of the rotating ring 20. Since the bearing 21 is arranged so as to be accommodated in the width direction (Z direction in FIG. 2) of the rotating ring 20, a thick frame in which the position of the bearing 21 is arranged in the width direction (Z direction) with respect to the rotating ring 20 On the other hand, the gantry 10 can be made thin.

(Fixing ring)
The fixing ring 30 will be described with reference to FIGS. 1 and 2. As shown in FIG. 2, the fixing ring 30 is arranged on the outer peripheral side of the rotating ring 20 so as to be within a range corresponding to the thickness of the rotating ring 20. By arranging the fixing ring 30 in this way, the fixing ring 30 does not hinder when the gantry 10 is thinned. A motor 31 for driving the rotating ring 20 is provided in the gap between the rotating ring 20 and the fixed ring 30. The motor 31 includes a rotor 33 provided on the rotary ring 20 and a stator 32 provided inside the gantry 10 (fixed ring 30) along the outer periphery of the rotor 33. By arranging the motor 31 in this way, the motor 31 does not hinder when the gantry 10 is made thin.

  A slip ring 35 is provided for transmitting electric power and signals to and from the fixed ring 30 via a circular electric path concentrically arranged with respect to the rotating ring 20 and a brush. The slip ring 35 is disposed so as to be within a range corresponding to the thickness of the X-ray tube 2 provided in the rotating ring 20 (the length in the Z direction in FIG. 2). A data transmission unit 36 is provided on the rotating ring 20 and the stationary ring 30 on the opposite side of the position where the slip ring 35 is provided.

  As described above, by configuring the rotating ring 20, the fixed ring 30, the bearing 21, and the motor 31, it is possible to make the mount 10 thin and provided with the large-diameter opening 1 a.

  In the thin gantry 10 provided with the large-diameter opening 1a, since the gantry 10 is thin, when the head of the subject is X-rayed, the head of the subject may be positioned near the entrance of the opening 1a. Thus, the light irradiated from the projector (not shown) and hitting the head of the subject can be easily seen from the entrance of the opening 1a. Further, since the opening 1a has a large diameter, it is possible to ensure a sufficient gap between the subject and the opening even when the body of the subject is large, and the subject can be easily accessed through the gap. It becomes possible. Thereby, the subject can be easily aligned and X-ray imaging can be performed. Further, since the surgical instrument is operated near the entrance of the opening in the puncture operation, the operability can be greatly improved.

  Further, X-ray imaging will be described with reference to FIG. FIG. 11 is a view showing a state where the nurse approaches the head of the subject. As shown in FIG. 11, since the gantry 10 is thin, the head of the subject placed on the bed and passed through the opening 1a is near the entrance (front entrance) of the opening 1a. However, the head of the subject can be easily accessed from the entrance of the opening 1a, and positioning can be easily performed. Further, since the opening 1a has a large diameter, positioning can be further simplified.

  Further, a puncture operation will be described with reference to FIG. FIG. 12 is a diagram showing a state of the puncture operation. As shown in FIG. 12, since the gantry 10 is thin, the head of the subject placed on the bed and passed through the opening 1a is in the vicinity of the entrance (back side entrance) of the opening 1a. Can easily access the head of the subject from the back side of the gantry 10, and the operability can be greatly improved by operating the surgical tool near the entrance of the opening 1a in the puncture operation. It becomes possible. Further, since the opening 1a has a large diameter, the operability can be further improved.

[Second Embodiment]
In the first embodiment, the configuration of the X-ray CT apparatus having the thin gantry 10 provided with the large-diameter opening 1a has been described.

  Next, a second embodiment of an X-ray CT apparatus capable of tilting the gantry 10 with a large tilt angle will be described with reference to FIGS. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The X-ray CT apparatus according to the second embodiment includes a stand 40, a shaft member 51, a tilt mechanism 50, and power transmission means 60 (see FIG. 5). The stand 40 supports the gantry 10 around the shaft member 51 so as to be inclined forward (front side) and rear (back side) of the opening 1a.

(stand)
First, the stand 40 will be described with reference to FIG. 1, FIG. 3, and FIG.

  FIG. 5 is a perspective view of the X-ray CT apparatus when the gantry 10 is tilted substantially horizontally. As shown in FIG. 5, the stand 40 includes a pair of support columns 41 and a base portion 42 that connects lower ends of the support columns 41. The support column 41 is formed in a box shape. With respect to the shaft member 51, the stand 40 supports the gantry 10 so as to be inclined between an angle in which the gantry 10 stands substantially vertically (see FIG. 1) and an angle in which the gantry 10 is tilted substantially horizontally (see FIG. 5).

  FIG. 3 is a cross-sectional view of the stand 40, with the gantry 10 omitted. As shown in FIG. 3, the bearing means 43 and the tilt mechanism 50 are accommodated in the column 41.

  The thickness of the stand 40 (length in the Z direction) is substantially the same as the thickness of the gantry 10 (see FIG. 1). Thereby, when an operator or a nurse approaches the opening 1a from the oblique side position of the gantry 10, the stand 40 does not get in the way and it is possible to prevent the workability from being lowered.

(Shaft member)
Next, the shaft member 51 will be described. FIG. 4 is a cross-sectional view of the shaft member 51. As shown in FIG. 4, the shaft member 51 has a hollow shaft portion 51a. A power line W and a signal line (not shown) are passed from the outside to the hollow shaft portion 51a, and the power line W is electrically connected to the slip ring 35 through the communication port 51b. The slip ring 35 is formed so that electrical contacts provided on the rotating ring 20 and the fixed ring 30 maintain electrical connection while slipping each other when the rotating ring 20 is rotated.

  As shown in FIG. 3, the support column 41 is provided with a bracket 52, and the bearing means 43 and the block 53 are fixed to the bracket 52. The block 53 is provided with power transmission means 60. The shaft member 51 and the bracket 52 are provided on both the columns 41, but the power transmission means 60 is provided on one column 41.

  The shaft member 51 is supported by the bearing means 43 so as to rotate. Since the power line W and the signal line pass through the hollow shaft portion 51 a of the shaft member 51, the power line W and the signal line are only slightly twisted in the hollow shaft portion 51 a of the shaft member 51 when the gantry 10 is tilted. . Therefore, the gantry 10 can be rotated, for example, by one rotation (360 ° rotation) or more.

(Tilt mechanism, power transmission means)
Next, the tilt mechanism 50 will be described with reference to FIG.
The tilt mechanism 50 includes power transmission means 60 that transmits the power of the motor 61 to the shaft member 51, thereby tilting the gantry 10 around the shaft member 51 and changing the tilt angle of the gantry 10. Position the gantry 10 at an angle.

  The power transmission means 60 includes a worm 62 driven by the power of the motor 61, and a wheel gear 63 that meshes with the worm 62 and is fixed coaxially with the shaft member 51. The motor 61 is an example of the “power source” of the present invention fixed to the block 53. The worm 62 and the wheel gear 63 are examples of the “first gear” and the “second gear” of the present invention.

  If the worm 62 continues to rotate, the wheel gear 63 and the shaft member 51 also continue to rotate, so the gantry 10 also continues to tilt. Therefore, the gantry 10 can be rotated, for example, by one rotation (360 ° rotation) or more. The worm 62 and the wheel gear 63 are formed to withstand the load from the gantry when the gantry 10 is tilted.

(Operation)
Next, the operation of the gantry 10 will be described with reference to FIGS. As shown in FIG. 1, when the worm 62 is rotated in the forward or reverse direction by the motor 61 when the tilt of the gantry 10 is at an upright angle, the wheel gear 63 and the shaft member 51 are rotated in the forward or reverse direction. Let In accordance with the rotation of the shaft member 51, the inclination of the gantry 10 increases, and finally becomes an angle that is tilted horizontally (see FIG. 5).

  As described above, the power of the motor 61 is transmitted from the worm 62 to the wheel gear 63, whereby the shaft member 51 can be rotated integrally with the wheel gear 63 to tilt the gantry 10. Even if the gantry 10 is at any inclination angle, the wheel gear 63 is engaged with the worm 62 and the worm 62 does not rotate even if the wheel gear 63 is rotated. , The tilt angle is held.

  FIG. 6 is a conceptual diagram of the X-ray CT apparatus shown in FIG. As shown in FIG. 6, the opening a of the gantry 10 is at a high position. At this time, the opening 1a is at the same height as the position of the lung field of the subject standing upright (standing position). Therefore, X-ray imaging of the lung field of the subject can be performed. Since the tilt mechanism 50 capable of changing the tilt of the gantry 10 from the upright angle to the horizontally tilted angle is provided, X-ray imaging of the subject in the standing position and the standing position can be performed with one X-ray CT apparatus. It becomes possible to do.

  Further, since the gantry 10 is made thin, the gantry 10 becomes lighter accordingly, and a large force is not required when the gantry 10 is tilted. Therefore, the large motor 61 becomes unnecessary, the tilt mechanism 50 becomes small, and it is not necessary to increase the thickness of the support column 41, and the thickness can be reduced.

  For comparison with the operation of the gantry 10 according to the second embodiment, a conventional technique for tilting the gantry 10 will be described. The conventional tilt mechanism has a cylinder for driving the gantry 10, the piston of the cylinder is connected to the gantry 10, and the gantry 10 is tilted forward or backward by the reciprocating movement of the piston. The tilt angle (tilt angle) of the gantry 10 was as small as about 30 degrees. Therefore, X-ray imaging that requires an inclination angle of 30 degrees or more cannot be performed. In addition, even when photographing the head and lung fields, it is necessary to place the patient on a bed, and X-ray imaging takes time.

  On the other hand, in the second embodiment, the gantry 10 can be tilted at a large tilt angle with the shaft member 51 as the center.

  As described above, the shaft member 51, which is the center when the gantry 10 is tilted, also has a function of preventing the rotating ring 20 from rotating.

  Next, the shaft member 51 having a function of preventing shaking will be described with reference to FIGS.

  FIG. 7 is a side view of the gantry 10, and FIG. 8 is a front view of the gantry 10. As shown in FIG.7 and FIG.8, a pair of shaft member 51 is being fixed to the both outer side parts of the mount frame 10 so that it may oppose centering on the opening 1a. Each shaft member 51 is formed such that its axial direction C is substantially horizontal (X direction) and faces the center of gravity G of the rotating ring 20. 7 and 8 show the rotation center axis A of the rotating ring 20.

  Here, the center of gravity G of the rotating ring 20 will be described. The rotary ring 20 is equipped with an X-ray tube 2 and an X-ray detector 3, a high voltage generator 4, a cooler 5, a weight 6, a controller (not shown), a motor 31, and the like. These equipped parts and the rotating ring 20 rotate together. The center of gravity G of the rotating ring 20 refers to the center of gravity of all components including the rotating ring 20 and the equipment that rotate integrally. The arrangement and weight of the weight 6 provided on the rotating ring 20 are set so that the center of gravity G is positioned on the rotation center axis A of the rotating ring 20.

  If the axial direction C of the shaft member 51 is not directed to the center of gravity G of the rotating ring 20, a swing occurs around the shaft member 51 while the rotating ring 20 is rotating, and this swing is acquired by X-ray photography. Therefore, it is necessary to provide a mechanism for preventing the rotating ring 20 from shaking.

  On the other hand, when the axial direction C of the shaft member 51 is directed to the center of gravity G of the rotary ring 20, the quality of the captured image is improved without causing a swing around the shaft member 51 while the rotary ring 20 is rotating. It is not necessary to provide a mechanism for preventing the rotating ring 20 from shaking without being lowered.

[Third Embodiment]
In the second embodiment, by moving the subject relative to the opening 1a of the gantry 10, it is possible to perform X-ray imaging of each part of the subject. However, since the subject needs to take a posture according to the imaging region, the subject feels troublesome. In order not to make the subject feel bothersome, a height adjustment mechanism for moving the gantry 10 in the vertical direction relative to the subject may be provided.

  Next, a height adjustment mechanism 70 according to a third embodiment will be described with reference to FIGS. 1, 3, and 5 to 10. In 3rd Embodiment, the same number is attached | subjected to the same site | part as the structure of 1st Embodiment, and the description is abbreviate | omitted. FIG. 1 is a diagram for explaining the first embodiment, and FIGS. 3, 5 and 6 are diagrams for explaining the second embodiment. It is also a figure for explanation.

  As shown in FIG. 3, in order to adjust the height of the gantry 10, a rail member 45 fixed to the standing wall 41 a of the support column 41 and a slider 54 guided in the vertical direction along the rail member 45 are provided. Yes. Here, the rail member 45 is an example of the “guide means” of the present invention.

  When the slider 54 is moved upward or downward along the rail member 45, the shaft member 51, the bracket 52, the block 53, and the bearing means 43 are integrally moved upward or downward. Thereby, the gantry 10 moves upward or downward. A long hole 41c having a vertical direction as a longitudinal direction is provided in the standing wall 41a of the support column 41 (see FIG. 9). The shaft member 51 moves upward or downward in the elongated hole 41c.

(Height adjustment mechanism)
The height adjustment mechanism 70 is provided on the bracket 52 and has a screw hole, and a screw member that is provided on the support column 41 and screwed to the nut member 71 has a screw hole having a central axis directed in the vertical direction. 72 and a motor 73 that rotates the screw member 72 in the forward direction and the reverse direction. The nut member 71 and the screw member 72 have a ball screw structure in which the ball rolls and rotates between them. The upper end portion of the screw member 72 is rotatably supported by the top portion 41 b of the support column 41, and the lower end portion of the screw member 72 is connected to the output shaft of the motor 73. The motor 73 is fixed to the standing wall 41 a of the support column 41.

  When the screw member 72 is rotated in the forward or reverse direction by rotating the motor 73, the nut member 71, the bracket 52, the block 53, and the bearing means 43 are integrally moved in the vertical direction. Thereby, the gantry 10 moves upward or downward.

  When the rotation of the motor is stopped, the gantry 10 stops and the gantry 10 is maintained at the stop position.

  FIG. 6 shows the opening 1a of the gantry 10 positioned at the height of the lung field of the subject in the standing state. When the gantry 10 is maintained at this position, the rotating ring 20 is rotated around the lung field of the subject and X-rays are irradiated from the X-ray tube 2, the X-ray detector 2 transmits the lung field and is detected by the X-ray detector 3. An X-ray image of the lung field can be acquired based on the line.

  Next, in order to acquire an X-ray image of the head of the subject, the subject is seated on the bed 7 and the motor 73 is rotated in the forward or reverse direction so as to move the gantry 10 downward.

  FIG. 9 is a perspective view of the X-ray CT apparatus when the gantry is tilted substantially horizontally and moved to a low position. FIG. 10 is a conceptual diagram of the X-ray CT apparatus shown in FIG. As shown in FIG. 9 and FIG. 10, when the height of the opening 1a of the gantry 10 is the position of the head of the subject in the seated state, when the rotation of the motor 73 is stopped, the gantry 10 stops, And the gantry 10 is maintained in the stop position.

  When the gantry 10 is maintained at this position, the rotating ring 20 is rotated around the head of the subject and X-rays are irradiated from the X-ray tube 2, the head is transmitted and detected by the X-ray detector 3. An X-ray image of the head can be acquired based on the line.

  In the third embodiment, since the opening 1a of the gantry 10 is automatically moved to the height position of the head of the subject in the seated state, X-ray imaging can be easily performed. Further, in X-ray imaging of the head, the subject simply sits on the bed 7, so that the subject does not feel bothersome.

  In the third embodiment, the nut member 71 is provided on the bracket 52 and the screw member 72 is provided on the support column 41. However, the nut member 71 may be provided on the support column 41 and the screw member 72 may be provided on the bracket 52.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, rewrites, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 X-ray CT apparatus 1a Aperture 2 X-ray tube 3 X-ray detector 4 High voltage generator 5 Cooler 6 Weight 7 Bed 10 Stand
20 Rotating ring 21 Bearing 30 Fixed ring 31 Motor 32 Stator 33 Rotor
35 Slip ring 36 Data transmission unit 40 Stand 41 Post 41a Standing wall 41b Top part 41c Elongation hole 42 Base part 43 Bearing means 45 Guide means 50 Tilt mechanism 51 Shaft member 52 Bracket 53 Block 54 Slider 60 Power transmission means 61 Motor 62 First gear 63 Second gear 70 Height adjustment mechanism 71 Nut member 72 Screw member 73 Motor

Claims (6)

The subject is passed through the opening of the gantry in the body axis direction, the X-ray tube and the X-ray detection unit arranged opposite to the center of the opening are rotated around the body axis of the subject, irradiated from the X-ray tube, In an X-ray CT apparatus that acquires a captured image based on X-rays that are transmitted and detected by the X-ray detection unit,
A rotating ring that is formed in a ring shape along the circumferential direction of the opening, and the X-ray tube and the X-ray detection unit are provided on the inner peripheral surface side thereof;
A bearing provided between an outer peripheral surface side of the rotating ring and the pedestal and supporting the rotating ring to rotate in a circumferential direction of the opening;
Having
An X-ray CT apparatus characterized by that. A motor for driving the rotating ring in the gantry;
2. The X-ray according to claim 1, wherein the motor includes a rotor fixed to an outer peripheral surface side of the rotating ring, and a stator disposed on the outer peripheral side of the rotor and fixed to the gantry. CT device. With a stand,
A shaft member supported by the stand;
An angle at which the gantry stands up substantially vertically with the shaft member as a center, including power transmission means including a wheel gear fixed coaxially with the shaft member and a worm meshed with the wheel gear and driven by the power And a tilt mechanism for positioning the gantry at the tilted angle.
A motor provided in the gantry for driving the rotating ring;
Further comprising
The shaft member is fixed to the gantry and has a power line for supplying power to the motor and a hollow shaft part for passing a signal line from the X-ray detection unit.
The X-ray CT apparatus according to claim 1. With a stand,
A shaft member supported by the stand;
A tilt mechanism that tilts between the angle that the stand is erected substantially vertically around the shaft member and an angle that is tilted forward or backward of the opening, and that positions the mount at the tilted angle;
Further comprising
The X-ray CT apparatus according to claim 1, wherein the shaft member is provided on the gantry so that an axial direction thereof is a substantially horizontal direction and faces a center of gravity of the rotating ring.   5. The apparatus according to claim 3, further comprising a height adjustment mechanism that adjusts a height of the gantry by moving the tilt mechanism between a high position and a low position of the stand. X-ray CT system.   The height adjusting mechanism includes a screw member provided in one of the stand or the tilt mechanism and a nut provided in the other of the stand or the tilt mechanism and moving in a height direction while being screwed into the screw member. The X-ray CT apparatus according to claim 5, further comprising a member.

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