JP2014073212A - X-ray ct apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus capable of cooling any equipment without raising a cost.SOLUTION: An X-ray CT apparatus comprises a rotation portion, a stationary portion and a plurality of pieces of electric equipment. The rotation portion includes an X-ray source for irradiating a specimen with an X-ray, and rotates the X-ray source on the body axis of the specimen. The stationary portion includes a pair of longitudinal frames for supporting the rotation portion in a clamping manner from the outer circumference, and a transverse frame connecting the lower end portions of the paired longitudinal frames to each other. The plurality of pieces of electric equipment include an electric power source for supplying an electric power to the X-ray source. The plurality of pieces of electric equipment are housed in a corner portion having a generally triangular section shape composed of a transverse frame and the aforementioned longitudinal frame. Between the transverse frame and the plurality of pieces of electric equipment, there is formed a ventilation clearance for passing the ambient air.

Description

  Embodiments described herein relate generally to an X-ray CT apparatus.

  The X-ray CT apparatus includes an X-ray source that irradiates a subject with X-rays, and includes a rotating unit that rotates the X-ray source around the body axis of the subject, and a fixed unit that supports the rotating unit. (For example, Patent Document 1).

  The fixing unit houses a power source that supplies power to the X-ray source and an electric device that generates heat, such as a control board. In addition, the electric device accommodated in the fixed part may be simply referred to as “device”. Since the X-ray CT apparatus is covered with a cover from the outside so as to suppress noise, heat generated from the device is likely to be trapped.

  In recent years, miniaturization of X-ray CT apparatuses has been desired. Along with this, the space for housing the equipment becomes narrower. If the number and size of the devices to be accommodated are not changed, the proportion of the devices that occupy the space (mounting density) increases. If it becomes so, the clearance gap between apparatuses will become narrow, it will become difficult to let air pass, and it will become difficult to fully cool an apparatus. Therefore, a fan was installed, and outside air was actively taken into the cover and cooled by applying it to the equipment.

JP 2000-60837 A

  However, the conventional method of cooling with a fan has the following problems. 1) A space for installing the fan is required, which hinders downsizing. 2) Since the mounting density is high, the device arranged on the same side as the fan can be cooled, but the device arranged farther from the fan is not exposed to the wind from the fan and cannot be cooled sufficiently. 3) In order to apply wind to any device, it is necessary to increase the number of fans and power cables that supply power to the devices, which increases the cost.

  This embodiment is intended to solve the above-described problem, and an object thereof is to provide an X-ray CT apparatus that can sufficiently cool any device without increasing costs.

  In order to solve the above problem, the X-ray CT apparatus of the embodiment includes a rotating unit, a fixed unit, and a plurality of electric devices. The rotating unit has an X-ray source that irradiates the subject with X-rays, and rotates the X-ray source around the body axis of the subject. The fixed portion includes a pair of vertical frames that support the rotating portion so as to sandwich the rotating portion from the outer peripheral direction, and a horizontal frame that connects lower ends of the pair of vertical frames. The plurality of electrical devices includes a power source that supplies power to the X-ray source. The plurality of electric devices are housed in a corner portion having a substantially triangular cross-sectional shape including a horizontal frame and the vertical frame. A ventilation gap through which outside air passes is provided between the horizontal frame and the electrical device.

1 is a front view of an X-ray CT apparatus according to a first embodiment. The side view of a X-ray CT apparatus. The block diagram of the configuration of the X-ray CT apparatus. B arrow view of FIG. The figure which shows an example of the corner part in which the ventilation path 4 was provided. The figure which shows an example of the corner part by which the apparatus is arrange | positioned. The top view of the arrange | positioned apparatus. The figure which shows an example of the groove-shaped member which concerns on 2nd Embodiment. The figure which shows an example of the groove-shaped member which concerns on 3rd Embodiment. The figure which shows an example of the corner part by which the apparatus which concerns on 4th Embodiment is arrange | positioned. The figure which shows an example of the corner part by which the apparatus which concerns on 5th Embodiment is arrange | positioned. The figure which shows an example of the corner part by which the apparatus which concerns on 6th Embodiment is arrange | positioned. The figure which shows an example of arrangement | positioning of the apparatus which concerns on 7th Embodiment, and a heat conductive member. The figure which shows the other example of arrangement | positioning of an apparatus and a heat conductive member. The top view of an oblique member.

[First Embodiment]
A first embodiment of an X-ray CT apparatus will be described with reference to the drawings.

  FIG. 1 is a front view of the X-ray CT apparatus, and FIG. 2 is a side view of the X-ray CT apparatus. 1 and 2, the cover is indicated by a wavy line.

  As shown in FIGS. 1 and 2, the X-ray CT apparatus has a cover 1, a rotating part 2, and a fixing part 3.

〔cover〕
As shown in FIG. 2, the cover 1 covers the rotating part 2 and the fixed part 3 from the outside. The cover 1 has a front cover, a rear cover, a ceiling cover, and an under cover. The front cover, the rear cover, and the ceiling cover are configured to cover the front surface portion, the rear surface portion, and the ceiling portion of the rotating unit 2. The under cover is configured to cover the fixed portion 3. A gap is formed between the surface (floor surface) on which the fixing portion 3 is set and the under cover. In addition, it may replace with this clearance gap and may provide a ventilation hole (illustration omitted) in an undercover with a clearance gap.

  Cold air outside the cover 1 is taken into the cover 1 through these gaps and ventilation holes. The gap and the ventilation hole may be referred to as “ventilation opening”. Moreover, the cold air taken into the cover 1 through the ventilation port 12 from the outside of the cover 1 may be referred to as “outside air”.

(Rotating part)
FIG. 3 is a functional block diagram of the X-ray CT apparatus. As shown in FIGS. 1 to 3, the rotating unit 2 is detected by an X-ray source that irradiates the subject with X-rays, an X-ray detector that detects X-rays that have passed through the subject, and an X-ray detector. And a data collection unit for collecting the collected signals. The X-ray source and the X-ray detector are arranged opposite to each other and rotated around the body axis of the subject.

〔Fixed part〕
As shown in FIGS. 1 and 2, the fixing portion 3 includes a pair of vertical frames 31, horizontal frames 32, and diagonal members 33.

  The pair of vertical frames 31 support the rotating part 2 so as to sandwich the rotating part 2 from the outer peripheral direction. The vertical frame 31 is, for example, a hot rolled steel plate having a thickness of 4 [mm], and members having a substantially U-shaped cross section are overlapped with each other, and the total thickness is about 40 [mm], the width is about 280 [mm], and the height. It has a plate shape of about 870 [mm].

  The horizontal frame 32 connects the lower ends of the pair of vertical frames 31. The horizontal frame 32 has, for example, a plate shape made of a general structural rolled steel plate having a thickness of about 9 [mm], a width of about 650 [mm], and a length of about 2000 [mm].

  In the fixed portion 3, an accommodating space for accommodating the rotating portion 2 is provided between the pair of vertical frames 31. For the purpose of miniaturizing the X-ray CT apparatus, the rotating unit 2 is deeply provided between the pair of vertical frames 31 in order to suppress the overall height of the apparatus. Therefore, the gap between the lower surface of the rotating unit 2 and the ground surface (installation surface) is about 50 mm when the rotating unit 2 is tilted, so that the space for accommodating the device is narrow. In the horizontal frame 32, a recess (or a through hole) is provided at a position facing the rotating portion 2 when tilted, and a clearance with the rotating portion 2 is secured.

  Therefore, the space for accommodating the device is a portion excluding the accommodation space between the pair of vertical frames 31. This portion may be referred to as a corner portion 34. 1 and 2, “A” indicates an area in the corner portion 34 that can accommodate the device.

  The devices arranged in the corner portion 34 include a power source that supplies power to the X-ray tube, various control boards that control the rotating portion 2, and the like.

  In the device arranged at the corner portion 34, in FIG. 1, the device arranged at the back position in the front-rear direction may be referred to as “the back device”, and the device arranged at the front position is referred to as “the near side”. Sometimes referred to as “equipment”. Here, the front means the front side (or front side) of the apparatus, and the rear means the rear side (or back side) of the apparatus.

(Corner 34)
As shown in FIG. 1, the corner portion 34 is configured by a vertical frame 31, a horizontal frame 32, and an oblique member 33 in a triangular cross-sectional shape. Note that the corner portion 34 may be configured by only the vertical frame 31 and the horizontal frame 32. Moreover, in FIG. 1, the corner part 34 is provided in the left side and the right side seeing from the front of the apparatus. In the following description, the structure (described later) of the air passage 4 provided in the left corner portion 34 will be described, but the structure of the air passage 4 provided in the right corner portion 34 is the same as this. is there.

(Oblique member 33)
The diagonal member 33 is a member that reinforces the structure of the apparatus by straddling between the horizontal frame 32 and the vertical frame 31. The inside of the corner portion 34 is separated from the outside (that is, the storage space) by the oblique member 33. The oblique member 33 is a hot rolled steel plate having a thickness of 4 [mm], and members having a substantially U-shaped cross section are superposed on each other, and has a plate shape with a total thickness of about 35 [mm] and a width of about 280 [mm]. doing.

  As shown in FIGS. 1 and 2, the side, lower, and upper sides of the corner portion 34 are closed by a vertical frame 31, a horizontal frame 32, and an oblique member 33. The front and rear of the corner portion 34 are open. Note that a mouth opened forward may be referred to as a “front mouth”, and a mouth opened backward may be referred to as a “rear mouth”. When the outside air taken in from the ventilation port 12 reaches the front device from the front port or the rear port, the front device is cooled.

  4 is a view taken in the direction of arrow B in FIG. As shown in FIG. 4, the diagonal member 33 is provided with a communication hole 331 that allows air in the corner portion 34 to pass upward. Thereby, the heat heated by the device passes through the communication hole 331 and escapes upward, and the corner portion 34 does not accumulate heat.

  However, outside air from the front and rear openings does not reach the back equipment, and the back equipment cannot be cooled. In this embodiment, as will be described below, it is configured to allow outside air to reach the back device and cool the back device without using a fan.

(Structure of air passage)
Next, the structure of the air passage will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of a corner portion provided with a ventilation path. In FIG. 5, an example of the area | region A which can accommodate the apparatus in a corner part is shown with a dashed-dotted line.

  As shown in FIG. 5, a ventilation gap through which outside air passes is provided between the horizontal frame 32 and the device. Note that the ventilation gap may be referred to as an “air passage”.

  As shown in FIG. 2, the outside air taken into the cover 1 through the ventilation port 12 is passed through the ventilation path 4. Such a flow of outside air is indicated by a one-dot chain line in FIG. As shown in FIG. 2, the opening of the air passage 4 is arranged toward the ventilation port 12 and in the vicinity of the ventilation port 12 so that outside air can be easily passed through the air passage 4.

In FIG. 5, the height of the ventilation path 4 and the effective height of the area A (indicated by the alternate long and short dash line) that can accommodate the device in the corner portion 34 are indicated by ha and hb. The relationship between ha and hb is expressed by the following equation.
ha> 2.0 × 10 ⁻² * hb (1)
In this way, by ensuring the height ha of the air passage 4, it is possible to sufficiently introduce outside air into the air passage 4 for cooling the equipment to be accommodated without reducing the accommodation capacity.

  As shown in FIG. 5, the structure of the ventilation path 4 includes a groove-like member 41 and a plate member 42. The groove-like member 41 and the plate member 42 are formed of a hot dip galvanized steel sheet.

  The groove-like member 41 has a substantially U-shaped cross-sectional groove. The groove is provided along the front-rear direction. Accordingly, the outside air (cold air) is continuously passed from the front and rear groove openings (openings of the air passage 4) to the lower position of the device at the back along the groove.

  In addition, although what showed external air is passed from the front-back direction (both directions) was shown, it does not necessarily pass from both directions. Moreover, the direction which lets external air pass is not restricted to the front-back direction. What is necessary is just to provide a groove | channel along the direction which wants to let external air pass. At this time, the device arranged at the back position with respect to the direction in which the outside air is desired to pass is the “back device”, and the device arranged at the front position is the “front device”.

  The plate member 42 is configured to cover the groove of the groove-like member 41 from above. The plate member 42 is provided with a communication hole 421 that allows outside air in the ventilation path 4 to pass upward. Then, the outside air passed from the groove (opening of the ventilation path 4) to the lower position of the back device is delivered to the back device through the communication hole 421. As a result, the device behind is cooled by the outside air.

  As described above, the devices (the front device and the back device) disposed in the corner portion 34 are cooled by the outside air.

  Further, the air in the corner portion 34 heated by the device rises and is discharged upward through the communication hole 331. Thereby, no heat is trapped in the corner portion 34.

(Equipment layout)
FIG. 6 is a front view showing an example of the corner portion 34 in which devices are arranged. FIG. 6 schematically shows a total of six devices in which a pair of front and rear is arranged in three rows. For convenience of explanation, each device is shown in the same shape. These devices are indicated by “E” in FIG. 6 (the same applies to the following drawings). As shown in FIG. 6, the device is connected to the terminal block 35 by a cable 36.

  As shown in FIG. 6, the plurality of devices are arranged to be shifted in the height direction by reducing the overlapping portions of the side surfaces.

  By reducing the overlapping portion between the side surfaces of the device, the amount of heat released from the side surface of the device to the outside increases, and it is possible to prevent the device from being heated. Further, by shifting in the height direction, it is possible to efficiently use the space of the corner portion 34 having a triangular cross-sectional shape.

FIG. 7 is a plan view of the arranged equipment. In FIG. 7, the devices are arranged in close contact with each other, but may be arranged at intervals.
As shown in FIG. 7, the plurality of devices are arranged shifted in the front-rear direction. Thereby, it is possible to reduce the overlapping portion between the side surfaces of the device.

(Basic configuration)
Next, a basic overall configuration of the X-ray CT apparatus will be briefly described with reference to FIG. FIG. 3 is a configuration block diagram of the X-ray CT apparatus.

  The X-ray CT apparatus 10 includes a system control unit 61, an operation unit 62, a gantry / bed control unit 63, a bed moving unit 65, an X-ray control device 67, a high voltage generator 69, an X-ray source 71, a detector 73, and a rotation. 2, a data collection unit 77, a collected data storage device 79, an image reconstruction processing unit 81, and a display unit 83. The X-ray CT apparatus 10 exposes an X-ray beam while rotating an X-ray source 71 around a subject P. The high voltage generator 69 corresponds to a “power source”.

  The system control unit 61 outputs a detection control signal indicating the detection timing of the X-ray beam to the data collection unit 77. The system control unit 61 outputs a data collection control signal for data collection to the data collection unit 77.

  The operation unit 62 is a mouse, a keyboard, or the like, and inputs various information. The system control unit 61 includes a central processing unit (CPU) and the like, and the slice thickness, rotation speed, bed movement amount, and the like input from the operation unit 62 are used as a table / bed control signal with respect to the table / bed control unit 63. Output. The system control unit 61 outputs an X-ray beam generation control signal for controlling X-ray beam generation to the X-ray controller 67.

  The gantry / bed control section 63 rotates the rotator 2 based on the gantry / bed control signal output by the system control section 61 and outputs a bed movement signal to the bed movement section 65.

  The X-ray controller 67 controls the timing of high voltage generation by the high voltage generator 69 based on the X-ray beam generation control signal output by the system controller 61. The high voltage generator 69 supplies a high voltage for exposing the X-ray beam to the X-ray source 71 in accordance with a control signal from the X-ray controller 67.

  The X-ray source 71 emits a fan-shaped X-ray beam having a thickness in the slice direction toward the subject from multiple directions by the high voltage supplied from the high voltage generator 69. The detector 73 detects the X-ray beam that is exposed from the X-ray source 71 and transmitted through the subject.

  The detector 73 includes a two-dimensional detector having a multi-channel detection element and a plurality of detectors arranged in the slice direction. For each row, for example, detection elements of about 1,000 channels are arranged in an arc shape with the focus of the X-ray source 71 as the center.

  The rotating unit 2 holds an X-ray source 71 and a detector 73. The rotating unit 2 is rotated around a rotation axis passing through an intermediate point between the X-ray source 71 and the detector 73 by a gantry rotating mechanism (not shown). Collecting projection data of a plurality of slices (multiple slices) of the subject while the X-ray source 71 and the detector 73 make one rotation around the subject is referred to as one scanning operation.

  The data collection unit 77 simultaneously collects and outputs projection data of a plurality of slices of the subject based on the data collection control signal output by the system control unit 61. The collected data storage device 79 stores projection data of a plurality of slices of the subject collected by the data collecting unit 77.

  The image reconstruction processing unit 81 simultaneously reconstructs a plurality of tomographic images of the subject based on the projection data of a plurality of slices stored in the collected data storage device 79. The display unit 83 simultaneously displays a plurality of tomographic images of the subject reconstructed by the image reconstruction processing unit 81 on the monitor.

  The system control unit 61 has a scan control unit 611. The scan control unit 611 performs low-dose X-ray exposure in the real prep scan, and relatively high-dose X-ray exposure in the main scan.

  An X-ray controller 67, a high voltage generator 69 as a power source, and a collected data storage device 79 are arranged. These correspond to “devices” arranged in the corner portion 34.

(Operation)
The configuration according to the first embodiment has been briefly described above. Next, the operation of the X-ray CT apparatus will be described with reference to the drawings.

  When the X-ray CT apparatus is operated, heat is generated from the equipment. The air in the corner portion 34 is warmed by this heat, rises, and is discharged upward through the communication hole 331. Thereby, no heat is accumulated in the corner portion 34.

  Also, the outside air is taken into the corner portion 34 as the heated air rises. The taken-in outside air reaches the front device from the front and rear ports, and cools the front device.

  Further, outside air is passed in the front-rear direction from the opening of the ventilation path 4, passes through the communication hole 421, reaches the back device, and cools the back device. As described above, the devices (the devices in the foreground and the devices in the back) disposed in the corner portion 34 are cooled by the outside air.

[Second Embodiment]
Next, a second embodiment of the X-ray CT apparatus will be described with reference to FIG.

  Note that in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different components are mainly described. The same applies to the following various embodiments.

  In the structure of the ventilation path 4, in the first embodiment, the groove-like member 41 is provided with one groove, but in the second embodiment, a plurality of grooves are provided.

  FIG. 8 is a diagram illustrating an example of the structure of the ventilation path 4. As shown in FIG. 8, the groove-like member 41 has a plurality of grooves. By having a plurality of grooves, the strength of the groove-like member 41 can be increased.

  The groove has a substantially U-shaped cross-sectional shape. Moreover, the connection part of adjacent groove | channels has a substantially reverse U-shaped cross-sectional shape.

  The plate member 42 is provided with a communication hole 421. The communication hole 421 is provided along each groove. The outside air that has moved along the groove is delivered to the inner device through the communication hole 421. Thereby, the equipment in the back can be cooled.

  The other communication hole 421 is provided along the connecting portion. This connecting portion corresponds to a groove for guiding outside air to the back. A pilot hole 411 is provided in the connection portion corresponding to the communication hole 421. The outside air that has moved along the connecting portion is delivered to the back device through the pilot hole 411 and the communication hole 421. Thereby, the equipment in the back can be cooled.

[Third Embodiment]
Next, a third embodiment of the X-ray CT apparatus will be described with reference to FIG. FIG. 9 is a diagram illustrating an example of the structure of the ventilation path 4.

  As shown in FIG. 9, the connection part of adjacent groove | channels has a substantially reverse V-shaped cross-sectional shape. By providing the connecting portion with a substantially V-shaped cross-sectional shape, it is possible to suppress a significant decrease in the cross-sectional area of the air passage 4 even if a plurality of grooves are provided.

  The communication hole 421 provided in the plate member 42 is provided along each groove. Outside air is delivered to the inner device through a communication hole 421 provided along the groove. Thereby, the equipment in the back can be cooled.

[Fourth Embodiment]
Next, a fourth embodiment will be described with reference to FIG. FIG. 10 is a diagram illustrating an example of the corner portion 34 in which devices are arranged.

  In the first embodiment, the device arranged in the corner portion 34 is shown by shifting the device in the height direction. In the fourth embodiment, the device is shifted in the direction along the oblique member 33. Are arranged.

  As shown in FIG. 10, the devices are arranged so as to be shifted in the direction along the oblique member 33. Thereby, the overlapping part of the side surfaces of the device can be reduced, the amount of heat released from the side surface of the device to the outside can be increased, and the device can be prevented from being heated. Further, by shifting in that direction, the space of the corner portion 34 having a triangular cross-sectional shape can be used efficiently.

[Fifth Embodiment]
Next, a fifth embodiment will be described with reference to FIG. FIG. 11 is a diagram illustrating an example of the corner portion 34 in which devices are arranged.

  In the device arranged in the corner portion 34, the first embodiment shows the device arranged by shifting the device in the height direction, but in the fifth embodiment, the device is in a direction orthogonal to the oblique member 33. It is arranged to shift to.

  As shown in FIG. 11, the devices are arranged so as to be shifted in a direction orthogonal to the oblique member 33. Thereby, the overlapping part of the side surfaces of the device can be reduced, the amount of heat released from the side surface of the device to the outside can be increased, and the device can be prevented from being heated. Further, by shifting in that direction, the space of the corner portion 34 having a triangular cross-sectional shape can be used efficiently.

[Sixth Embodiment]
Next, a sixth embodiment will be described with reference to FIG. FIG. 12 is a diagram illustrating an example of the corner portion 34 in which devices are arranged.

  In the device arranged in the corner portion 34, the device in which the device is displaced in the height direction is shown in the first embodiment, but in the sixth embodiment, the device is arranged in a fan shape.

  As shown in FIG. 12, devices are arranged in a fan shape at the corner portion 34. As a result, the gap between adjacent devices is similarly fan-shaped, the side surfaces of the devices do not overlap each other, the amount of heat released from the side surfaces to the outside increases, and it is possible to prevent the devices from being heated. Become. Moreover, by arranging in a fan shape, it is possible to efficiently use the space of the corner portion 34 having a triangular cross-sectional shape.

[Seventh Embodiment]
Next, a seventh embodiment will be described with reference to FIG. FIG. 13 is a diagram illustrating an example of the arrangement of devices and heat conducting members.

  In the first embodiment, the side surfaces of the adjacent devices are shifted and overlapped. However, in the seventh embodiment, the heat conducting member 5 is provided between the side surfaces instead of simply overlapping.

  The heat conduction member 5 has anisotropy that is superior in heat conduction in the plane direction compared to the thickness direction. For the heat conducting member 5, a conductive filler such as graphite, carbon black, metal powder (silver, copper, silicon, etc.) is used. The heat conducting member 5 is formed into a sheet shape.

  As shown in FIG. 13, one end of the heat conducting member 5 is mounted so as to be sandwiched between side surfaces so as to absorb heat from the device. The other end portion is extended to the fixing portion 3 so as to conduct the absorbed heat to the fixing portion 3 (any one of the vertical frame 31, the horizontal frame 32, and the oblique member 33).

  By using the heat conducting member 5, it is possible to actively guide the heat to the fixed portion 3, prevent the device from being heated, and further prevent the heat from being accumulated in the corner portion 34. In addition, said heat conductive member 5 can be used for others.

  FIG. 14 is a diagram illustrating another example of the arrangement of the device and the heat conducting member 5. As shown in FIG. 14, the heat conducting member 5 is mounted so as to be sandwiched between the device and the fixing portion 3. Thereby, when the device is arranged close to the fixing portion 3, it is possible to absorb heat from the device and conduct the absorbed heat to the fixing portion 3.

  Further, one end portion of the heat conducting member 5 may be attached to the device, and the other end portion may be extended to the fixing portion 3. As a result, when the device is arranged apart from the fixed portion 3, it is possible to absorb heat from the device and conduct the absorbed heat to the fixed portion 3.

  In addition, in the said embodiment, although the contact 331 was uniformly arrange | positioned over the whole surface of the flat-shaped diagonal member 33 (refer FIG. 4), it is not restricted to this.

  FIG. 15 is a plan view of the oblique member 33. As shown in FIG. 15, the diagonal member 33 is provided with a communication hole 331 in the range of about half of the surface. The range in which the communication hole 331 is arranged is arranged in a range that is about half of the height of the diagonal member 33 that is assembled obliquely when the bracing is performed between the horizontal frame 32 and the vertical frame 31. Thereby, the heat heated by the device rises, passes through the connection hole 331, and escapes upward, so that the heat is not trapped in the corner portion 34. The device is indicated by “E” in FIG.

  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 Cover 12 Ventilation port 2 Rotating part 3 Fixed part 31 Vertical frame 32 Horizontal frame 33 Diagonal member 331 Connection hole 34 Corner part 4 Structure of ventilation path (ventilation gap) 41 Grooved member 411 Lower hole 42 Plate member 421 Communication hole DESCRIPTION OF SYMBOLS 5 Heat conduction member 61 System control part 611 Scan control part 62 Operation part 63 Stand and bed control part 65 Bed movement part 67 X-ray control apparatus 69 High voltage generator 71 X-ray source 73 Detector 77 Data collection part 79 Collected data storage Device 81 Image reconstruction processing unit 83 Display unit

Claims (10)

A rotating unit that has an X-ray source for irradiating the subject with X-rays, and rotates the X-ray source around the body axis of the subject;
A fixed portion having a pair of vertical frames that support the rotating portion so as to sandwich the rotating portion from the outer peripheral direction, and a horizontal frame that connects lower ends of the pair of vertical frames;
A plurality of electrical devices including a power source for supplying power to the X-ray source;
Have
The plurality of electrical devices are housed in a corner portion having a substantially triangular cross-sectional shape composed of the horizontal frame and the vertical frame,
A ventilation gap through which outside air passes is provided between the horizontal frame and the electrical device;
X-ray CT apparatus characterized by this. The fixing portion further includes an oblique member that partitions the storage space for the rotating portion and the corner portion between a pair of vertical frames by straddling the horizontal frame and the vertical frame,
The oblique member has a communication hole for connecting the accommodation space and a corner portion;
The X-ray CT apparatus according to claim 1. The plurality of electrical devices are arranged so as to be shifted by reducing the overlapping portions of the side surfaces,
The X-ray CT apparatus according to claim 1, wherein: The electrical equipment is arranged to be shifted in the height direction;
The X-ray CT apparatus according to claim 3. The electrical equipment is arranged shifted in a direction along the oblique member;
The X-ray CT apparatus according to claim 3. The electrical equipment is arranged to be shifted in a direction perpendicular to the oblique member;
The X-ray CT apparatus according to claim 3. The plurality of electric devices are arranged in a fan shape,
The X-ray CT apparatus according to claim 1, wherein: In the electric device arranged by shifting the side surfaces,
One end portion mounted so as to be sandwiched between the side surfaces so as to absorb heat from the electrical device, and the other end portion extended to the fixing member so as to conduct the absorbed heat to the fixing portion. A heat conductive member having anisotropy having
The X-ray CT apparatus according to claim 3. The height of the ventilation gap is greater than 2.0 × 10 ⁻² times the effective height that can accommodate the electrical device in the corner portion,
The X-ray CT apparatus according to claim 1. The connecting hole is arranged on the higher side in the oblique member assembled obliquely when the bracing is performed between the horizontal frame and the vertical frame;
The X-ray CT apparatus according to claim 2.

Images