JP2010187811A - X-ray ct apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus capable of efficiently cooling the inside of a detector having a higher density. <P>SOLUTION: DAS (Data Acquisition System) chips 21 are provided on front and rear surfaces of a substrate 13 respectively. On the surface of the substrate 13, a DAS chip 21a and a DAS chip 21b are placed. The DAS chip 21a is placed at an upper right part viewed from the front of the substrate 13. The DAS chip 21b is placed at a lower left part viewed from the front of the substrate 13. That is, the DAS chip 21a and the DAS chip 21b are placed horizontally and vertically shifted from each other on the substrate 13. Thus, the DAS chip 21a and the DAS chip 21b do not overlap each other but are placed apart from each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an X-ray CT apparatus, and more particularly to cooling an X-ray detector.

  Conventionally, an X-ray CT apparatus irradiates a subject with X-rays and detects the transmitted X-rays with an X-ray detector. An X-ray detector converts information from an X-ray to an electric current via light, and a DAS (Data Acquisition System) chip (analog-digital conversion element) provided on a substrate connected to the X-ray detector, Converted to a digital signal.

  In recent years, there has been an increasing demand for multi-slice detectors capable of capturing a plurality of tomographic images at a time in a short time for the purpose of shortening examination time, low exposure to a subject, cardiac examination, and the like. In the multi-slice detector, a plurality of detection elements such as 64 rows are arranged in the body axis direction of the subject. This increases the amount of data handled by the detector, increases the number of DAS chips, and causes a rise in temperature inside the detector. Usually, a photodiode that converts light into current has a temperature coefficient, and because it is affected by positional accuracy associated with thermal expansion of the detector, etc., when the temperature inside the detector rises (fluctuates), May cause measurement errors.

  However, in the conventional X-ray CT apparatuses, no particular consideration has been given to the cooling inside the detector. Therefore, there is a demand for an X-ray CT apparatus capable of efficiently cooling the inside of the detector having a high density and maintaining a constant temperature.

  As described above, in the X-ray CT apparatus, there has not been proposed a method for increasing the cooling efficiency inside the detector. However, in a general information processing apparatus or the like, as a method for obtaining a stable cooling effect of the heat radiation component, for example, There is a cooling device in which a plurality of fans are used for a heat radiating component, a plurality of fans are arranged radially around the heat radiating component, and the cooling air of the fan intersects on the heat radiating component (Patent Document 1). .

JP-A-8-76891

  However, since many X-ray detectors used in X-ray CT apparatuses need to convert X-rays into light, it is necessary to prevent light from entering the detector. Moreover, since the detector is heavy and rotates around the subject at high speed, it requires a very large strength. For this reason, a hole for heat radiation cannot be made unnecessarily. In addition, due to the downsizing of the apparatus and the diameter of the subject part being increased, the installation space for the detector cannot be increased. Therefore, it is difficult to simply apply a cooling device such as that disclosed in Patent Document 1 to cool a detector of an X-ray CT apparatus that has restrictions on installation space and the like.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide an X-ray CT apparatus capable of efficiently cooling the inside of a detector having a high density.

  In order to achieve the above-described object, the present invention irradiates a subject with X-rays, detects an X-ray dose transmitted through the subject, and constructs a tomographic image of the subject based on the X-ray dose. An X-ray CT apparatus for detecting an X-ray dose, a substrate on which an analog-digital conversion element for converting information obtained by the X-ray detection device is mounted, and on the substrate A plurality of heat dissipating fins for cooling the analog-digital conversion element; and an air supply fan for sending cooling air to the heat dissipating fins, and the plurality of heat dissipating fins on the substrate. The X-ray CT apparatus is disposed at positions shifted from each other in a direction substantially perpendicular to the air supply direction so as not to overlap with the air supply direction of the fan.

  The plurality of radiating fins may be arranged on the substrate so as to be further shifted in the front-rear direction with respect to the air feeding direction of the air feeding fan. It is desirable that the analog-digital conversion elements are provided on both surfaces of the substrate, and the analog-digital conversion elements are arranged at positions that do not overlap each other with the substrate interposed therebetween.

A plurality of the substrates are arranged with respect to the air supply direction of the air supply fan,
It is desirable that the plurality of substrates be provided at positions shifted from each other in a direction substantially perpendicular to the air supply direction of the air supply fan.

  An exhaust fan that exhausts the hot air after cooling the heat dissipating fins is provided. In this case, the exhaust fan may be exhausted in the same direction as the air supply direction of the air supply fan. The air supply direction may be substantially perpendicular to the air supply direction, or may be opposite to the air supply direction of the air supply fan.

  According to the present invention, the radiation fin provided on the analog-digital conversion element that generates heat is shifted so as not to overlap the cooling air received from the air supply fan (for example, cooling that flows in the body axis direction of the subject). Since the heat radiating fins are arranged at a position shifted in the vertical direction of the subject with respect to the wind, a plurality of heat radiating fins do not interfere with the cooling air, and each radiating fin has a fresh cooling air. Can be applied. For this reason, each radiation fin can be cooled efficiently.

  Further, if the arrangement of the heat dissipating fins is shifted in the front-rear direction with respect to the air supply direction of the air supply fan (the axial direction of the air supply fan), the exhaust direction is, for example, the air supply direction of the air supply fan. Thus, even when the direction is changed in a substantially vertical direction, the radiating fin does not overlap the flow of the cooling air, and the cooling air can be efficiently applied to the radiating fin.

  In addition, in the board on which the analog-digital conversion element is mounted, the analog-digital conversion element is arranged on both the front and back surfaces, and the analog-digital conversion element provided on the front and back sides and the heat radiation fins on the front and back sides for cooling these are provided on the front and back sides of the board. In the arrangement, the analog-digital conversion elements can be efficiently arranged on the substrate and the heat generating portion can be separated by arranging them so as not to be in the same position across the substrate. In addition, since the installed radiating fins can be arranged so as not to overlap the cooling air, the detector can be efficiently cooled.

  Further, when a plurality of substrates are installed with respect to the air supply direction of the air supply fan, the substrates are in the left-right direction (the direction perpendicular to the air supply direction) with respect to the air supply direction of the air supply fan. ), The downstream substrate in the flow of the cooling air is hidden behind the upstream substrate, so that the cooling air does not interfere with the downstream substrate. Even when a plurality of substrates are installed in a direction substantially perpendicular to the air supply direction of the air supply fan, the plurality of substrates installed in the air supply direction of the air supply fan are The same effect can be obtained if they are installed at different positions.

  Also, if the exhaust fan has the same exhaust direction as the air supply fan, the cooling air and the warm air can flow straight, and the exhaust direction is perpendicular to the air supply direction. Then, the warm air can be quickly discharged to the outside, and if the exhaust direction is opposite to the air supply direction and the air supply port and the exhaust port are provided on the same surface of the X-ray CT apparatus, Even when exhaust is not provided behind or below the apparatus due to the above restrictions, hot air can be efficiently exhausted.

  ADVANTAGE OF THE INVENTION According to this invention, the X-ray CT apparatus which can cool the inside of the detector densified highly efficiently can be provided.

The conceptual diagram which shows the side surface cross section of the X-ray CT apparatus. The perspective view which shows the board | substrate 13. FIG. The front view which shows the board | substrate 13. FIG. The figure which shows the arrangement | positioning relationship of the air supply fan 15, the board | substrate 13, and the exhaust fan 17. FIG. 2A and 2B are conceptual diagrams showing an X-ray CT apparatus 30, where FIG. (A) is the figure which shows arrangement | positioning of the board | substrates 13a, 13b, 13c seen from the upper direction of the X-ray CT apparatus 30, (b) is a one part enlarged view of board | substrates 13a, 13b, 13c, Each positional relationship is shown. The figure shown. The figure which shows the board | substrate 40. FIG.

  Hereinafter, an X-ray CT apparatus 1 according to an embodiment of the present invention will be described. FIG. 1 is a conceptual diagram showing a side cross-section of the X-ray CT apparatus 1.

  The X-ray CT apparatus 1 mainly includes an X-ray tube 3, an X-ray collimator 5, an X-ray detection module 11, a substrate 13, an air supply fan 15, an exhaust fan 17, and the like.

  The X-ray tube 3 is an X-ray source mounted on the rotating plate 9 and is controlled by a control device or the like (not shown) to irradiate the subject 7 with X-rays.

  The X-ray collimator 5 irradiates the subject 7 with X-rays emitted from the X-ray tube 3 as X-rays such as a fan beam (fan beam) and a cone beam (cone or pyramid beam).

  The X-ray detection module 11 is disposed at a position facing the X-ray tube 3 or the like with the subject 7 interposed therebetween. The X-ray detection module 11 detects X-rays emitted from the X-ray tube 3 and transmitted through the subject 7. The X-ray detection module 11 includes a scintillator that converts X-rays into light, a substrate that is connected to the scintillator and that is mounted with an X-ray detection element such as a photoelectric conversion element that converts light into an electrical signal, and the like.

  The substrate 13 is connected to the X-ray detection module 11. The substrate 13 is mounted with a DAS chip, which will be described later, an analog-digital conversion element, heat radiation fins for cooling the chip, various IC components, and the like. The X-ray detection module and the substrate 13 (and various devices mounted thereon) are simply referred to as a detector. In some cases, the X-ray detection module 11 and the substrate 13 are composed of the same substrate, but in the following description, the X-ray detection module 11 and the substrate 13 on which the DAS chip is mounted are described as separate bodies. To do.

  Although not shown, a single X-ray module 11 is equipped with a plurality of X-ray detection elements. For example, 64 rows of X-ray detection elements in the body axis direction (left-right direction in FIG. 1) of the subject. Is placed. Accordingly, the number of DAS chips corresponding to these X-ray detection elements is required on the substrate 13.

  An air supply fan 15 is provided in front of the substrate 13 below the front surface (right side in FIG. 1) of the X-ray CT apparatus. The air supply fan 15 is for cooling the DAS chip on the substrate 13.

  An exhaust fan 17 is provided behind the substrate 13 below the X-ray CT apparatus 1 (left side in FIG. 1). The exhaust fan 17 is provided on substantially the same axis as the air supply fan 15. The exhaust fan 17 is for exhausting hot air, which is supplied from the air supply fan 15 and cools the devices on the substrate 13, from the detector.

  The X-ray CT apparatus 1 irradiates the subject with X-rays from the X-ray tube 3 while the subject 7 is in the apparatus. The X-ray transmitted through the subject 7 is detected by the X-ray detection module 11 and converted into an electric signal, and the converted electric signal is processed by the substrate 13. The processed information is sent to a control device, a display device, etc. (not shown), and further image processing, storage, display, and the like are performed.

  A rotary plate 9 is provided in the X-ray CT apparatus. The rotating plate 9 rotates around the subject 7 in the X-ray CT apparatus. That is, data is collected while the X-ray tube 3 and the X-ray detection module 11 mounted on the rotating plate 9 rotate around the subject 7.

  Next, the substrate 13 will be described. 2 is a perspective view of the substrate 13, and FIG. 3 is a front view of the substrate 13 as viewed from the direction A in FIG. As shown in FIG. 3, a plurality of DAS chips 21a, 21b, 21c, and 21d (hereinafter collectively referred to as DAS chips 21) are mounted on the substrate 13. 2 and 3, the X-ray detection module 11 and other IC components are not shown.

  As shown in FIG. 3, the DAS chip 21 is provided on each of the front and back sides of the substrate 13. In the following description, an example in which 16 DAS chips 21 are provided on the front and back sides as in the substrate 13 shown in FIG. 3 is shown. However, the number of DAS chips is not limited to this, and the X-ray detection element is not limited thereto. It is determined appropriately according to the number of the like.

  DAS chips 21a (four) and DAS chips 21b (four) are arranged on the front side of the substrate 13 (front side in FIG. 3). The DAS chip 21 a is disposed on the upper right side when viewed from the front of the substrate 13. The DAS chip 21b is disposed in the lower left as viewed from the front of the substrate 13.

  That is, the DAS chips 21a and 21b are substantially in the left-right direction (in the air supply direction from the air supply fan 15 in FIG. 1) and the vertical direction (in the air supply direction from the air supply fan 15 in FIG. 1) on the substrate 13. They are arranged at positions shifted from each other in the vertical direction). In addition, the arrow I in FIG. 3 shows the air supply direction from the air supply fan 15 of FIG. Therefore, the DAS chips 21a and 21b are arranged at positions separated from each other without overlapping each other in the air feeding direction of the air feeding fan 15 and the direction perpendicular to the air feeding direction.

  On the DAS chip 21a, heat radiation fins 19a are provided so as to cover the entire DAS chip 21a (four). The radiating fins 19a are cooling parts having a large surface area such as aluminum. Similarly, heat radiation fins 19b are provided so as to cover the entire DAS chip 21b (four). Since the DAS chips 21a and 21b are arranged at positions shifted from each other on the substrate 13, the radiation fins 19a and 19b provided on them do not interfere with each other. That is, the radiation fins 19 a and 19 b are arranged on the substrate 13 at positions shifted from each other in the air supply direction of the air supply fan 15 and the direction perpendicular to the air supply direction.

  Four DAS chips 21c and 21d are provided on the back side of the substrate 13 (the back side in FIG. 3). The DAS chips 21c and 21d are arranged on the substrate 13 at positions shifted from each other in the left-right direction and the up-down direction, similarly to the relationship between the DAS chips 21a and 21b. Moreover, the radiation fins 19c and 19d are provided on the DAS chips 21c and 21d.

  Further, the DAS chips 21c and 21d are arranged on the front and back of the substrate 13 at positions shifted from each other with the DAS chips 21a and 21b. For example, as shown in FIG. 3, in a state where the DAS chips 21 c and 21 d on the back surface of the substrate are seen through, the DAS chip 21 c is in the lower right when viewed from the front of the substrate 13, and the DAS chip 21 d is viewed from the front of the substrate 13. It is arranged at the upper left of

  That is, the DAS chips 21a, 21b, 21c, and 21d (and the radiating fins 19a, 19b, 19c, and 19d provided thereon) overlap each other on the front and back of the substrate 13 with the substrate 13 therebetween (the same). And the radiating fins 19a and 19b provided on the front surface of the substrate 13 do not overlap with each other in the air feeding direction I, and the radiating fins 19c and 19d provided on the back of the substrate 13 The air feeding direction I does not overlap each other.

  Next, the flow of the cooling air from the air supply fan 15 and the respective cooling by the arrangement of the radiation fins 19a and 19b will be described. FIG. 4 is a view showing the air supply fan 15 and the exhaust fan 17 and the substrate 13 arranged in the air flow path. In addition, since the surface and back surface of the board | substrate 13 are the same aspects, in the following description, the surface is demonstrated and description is abbreviate | omitted about a back surface.

  As shown in FIG. 4A, when cooling air is supplied by the air supply fan 15 (arrow I), the cooling air flows to the radiation fins 19a and 19b on the substrate. In FIG. 4A, the cooling air B flows through the radiating fin 19a, and the cooling air C flows through the radiating fin 19b. In the example of FIG. 4A, since the exhaust fan 17 is provided coaxially with the air supply fan 15, the warm air that has finished heat exchange with the cooling air and the heat radiating fins flows straight to the exhaust fan side and is exhausted. (Arrow O direction).

  The heat dissipating fins 19a and 19b are arranged at positions shifted from each other in a direction substantially perpendicular to the air feeding direction I of the air feeding fan 15 (in FIG. 4A, the vertical direction of the substrate 13). For this reason, the cooling air B cools only the radiation fins 19a, and the subsequent warm air does not hit the radiation fins 19b. Similarly, the cooling air C cools only the radiation fins 19b and does not hit the radiation fins 19a. Therefore, the cooling air can be efficiently exchanged heat with the radiating fin without being obstructed by the flow.

  In the above description, as shown in FIG. 1, the position of the exhaust fan 17 is on the same axis as the air supply fan, and the air supply and exhaust are performed in the same direction. It can be changed as appropriate according to the configuration and restrictions of the apparatus.

  For example, as shown in FIG. 4B, even when the exhaust fan 17 is below the substrate 13 (that is, the exhaust direction of the exhaust fan 17 is substantially perpendicular to the air supply direction of the air supply fan 15). The effect can be obtained similarly.

  In this case, the heat dissipating fins 19a and 19b are not only displaced in the direction (vertical direction) substantially perpendicular to the air feeding direction I of the air feeding fan 15, but are also displaced in the air feeding direction (front-rear direction). Thus, the cooling air can efficiently exchange heat with the radiation fins 19a and 19b.

  That is, as in the case of FIG. 4A, the cooling air D and E are blown to the radiation fins 19a and 19b, respectively, by the air supply from the air supply fan 15 (arrow I in the figure). After heat exchange is performed with each radiating fin by the cooling air, the direction of the cooling air (or warm air) is guided to the exhaust fan side by the exhaust fan 17 and exhausted by the exhaust fan 17 (arrow O in the figure). .

  That is, in the example of FIG. 4B, the blowing direction of the cooling air and the exhausting direction of the warm air change substantially vertically. Even in such a case, the radiation fins 19a and 19b are arranged so as not to overlap in both the air supply direction and the exhaust direction. Therefore, the cooling air (warm air) D and E do not interfere with each other, and heat exchange can be performed efficiently.

  Further, as shown in FIG. 4C, the same effect can be obtained even when the exhaust fan 17 is disposed on the front surface of the same apparatus as the air supply fan 15 and the air supply direction and the exhaust direction are opposite to each other. Can be obtained. That is, in this case, similarly to the case of FIG. 4B, the cooling air F and G are blown to the radiation fins 19a and 19b, respectively, by the air supply from the air supply fan 15 (arrow I in the figure). After the heat exchange is performed by the cooling fins by the cooling air, the direction of the cooling air (or hot air) is guided downward by the exhaust fan 17 arranged with a partition from the air supply fan 15 to exhaust the exhaust air. The air is further exhausted by the fan 17 to the front of the apparatus (arrow O in the figure).

  Even in such a case, the radiation fins 19a and 19b are arranged so as not to overlap in both the air supply direction and the exhaust direction. Therefore, the cooling air (warm air) F and G do not interfere with each other, and heat exchange can be performed efficiently.

  As described above, according to the X-ray CT apparatus 1 according to the embodiment of the present invention, the radiating fins 19a and 19b and the radiating fins 19c and 19d are located on the respective surfaces of the substrate with respect to the air feeding direction of the air feeding fan 15. Therefore, the cooling air can be efficiently exchanged heat with the radiating fins without being hindered by the flow of the cooling air.

  Further, since the heat radiation fins 19a and 19b and the heat radiation fins 19c and 19d are arranged at positions shifted from each other in the air supply direction of the air supply fan 15 on each surface of the substrate, the flow of the cooling air is supplied by the air supply fan. Even when the direction changes to a direction perpendicular to the direction, it is possible to efficiently exchange heat with the radiating fin without hindering the flow of the cooling air.

  Further, since the DAS chips 21a, 21b, 21c, and 21d (and the radiating fins 19a, 19b, 19c, and 19d provided on them) are not located at the same position on the front and back of the substrate 13, the substrate The DAS chips that are heating elements do not come close to each other through 13 and the DAS chips are not overheated.

  Next, an X-ray CT apparatus 30 according to the second embodiment of the present invention will be described. In the following embodiments, constituent elements that perform the same functions as those of the X-ray CT apparatus 1 shown in FIGS. 1 to 4 are assigned the same reference numerals as in FIGS. The X-ray CT apparatus 30 according to the second embodiment has substantially the same configuration as that of the X-ray CT apparatus 1, but differs in the following points. That is, the X-ray CT apparatus 30 is provided with a plurality of X-ray detectors (X-ray detection module 11 and substrate 13) in the body axis direction of the subject 7.

  5 is a view showing the X-ray CT apparatus 30, FIG. 5A is a side view corresponding to FIG. 1, and FIG. 5B is a front view of the X-ray CT apparatus 30 (FIG. 5A). It is sectional drawing of the figure seen from the arrow H direction. In FIG. 5A, the exhaust fan 17 is not shown.

  As shown in FIG. 5A, the X-ray CT apparatus 30 includes a plurality of X-ray tubes 3a, 3b, 3c in the body axis direction of the subject 7 (in the air supply direction of the air supply fan 15 in FIG. 5). Has been placed. Each X-ray tube 3a, 3b, 3c is provided with a corresponding X-ray collimator 5a, 5b, 5c, and at a position facing the subject 7 with the X-ray detection module and the substrates 13a, 13b, respectively. , 13c are provided. The substrates 13a, 13b, and 13c have the same configuration as the substrate 13 described above. In addition, the number of X-ray tubes and X-ray collimators is not limited to three, and may be one or two, or four or more as long as all X-ray detection modules can be irradiated with X-rays. It may be.

  As shown in FIG. 5B, a plurality of X-ray detection modules 11a and substrates 13a are arranged radially (seven in FIG. 5B) so as to surround the subject 7 around the X-ray tube 3a. (In the following description, the entire group of substrates arranged in a direction substantially perpendicular to the air feeding direction is generically referred to as a substrate 13a). That is, a plurality of substrates 13 a are arranged in a direction substantially perpendicular to the air supply direction of the air supply fan 15. Similarly, a plurality of substrates 13 b and 13 c (not shown) are arranged in a direction substantially perpendicular to the air supply direction of the air supply fan 15.

  6A is a diagram showing the arrangement of the substrates 13a, 13b, and 13c when the X-ray CT apparatus 30 is viewed from above, and FIG. 6B is an enlarged view of a part of the substrates 13a, 13b, and 13c. FIG. In FIG. 6A and FIG. 6B, illustration is omitted except for the substrates 13a, 13b, and 13c.

  As described above, the group of substrates 13a are provided substantially perpendicularly to the air supply direction of the air supply fan (in the direction of arrow I in the figure) with a predetermined interval. The substrate pitch of the substrate 13a is K as shown in FIG. Similarly, the group of substrates 13b and 13c are also provided substantially perpendicular to the air supply direction of the air supply fan and behind the substrate 13a (the rear side with respect to the air supply from the air supply fan 15). The substrate pitches of the substrate 13b and the substrate 13c are substantially equal to the substrate pitch of the substrate 13a (pitch K in FIG. 6B).

  The substrates 13a, 13b, and 13c are arranged so as to be shifted from each other in a direction substantially perpendicular to the air feeding direction I (in the direction of both sides of the subject 7 in FIG. 6A). It should be noted that the shift width between adjacent substrates 13a, 13b, and 13c (L in FIG. 6B) is such that at least the substrates do not overlap with each other in the air feeding direction, and desirably the substrates 13a, 13b , 13c are desirably shifted so as not to overlap each other.

  That is, when three rows of substrates 13a, 13b, and 13c are arranged as in the present embodiment, the total thickness of the substrates 13a, 13b, and 13c including the height of the radiating fins on the front and back sides is set to M (FIG. 6 (b)), the substrate pitch K of each of the substrates 13a, 13b, and 13c is set to three times or more of the total thickness M of the substrate, and the deviation width L between the substrates 13a, 13b, and 13c is set to M or more. It is desirable.

  In the present embodiment, an example is shown in which seven substrates are provided substantially perpendicular to the air supply direction with a predetermined substrate pitch, and three groups of substrates are provided in the air supply direction. However, the number of substrates arranged is not limited to this. A desirable substrate pitch K when N rows of substrates are arranged may be N times the total thickness M of the substrate.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, although four radiating fins are provided on the substrate 13, the present invention is not limited to this. For example, as shown in FIG. 7, heat radiation fins 43 a, 43 b, 43 c may be provided on the surface of the substrate 40, and heat radiation fins 43 d, 43 e, 43 f may be provided on the back surface of the substrate 40. In this case, a total of six radiating fins are provided on one substrate 40.

  Even in this case, the respective DAS chips arranged under the heat radiating fins are not arranged at positions where they overlap each other on the front and back of the substrate 40 (the same).

  In addition, on each surface of the substrate 40, the heat dissipating fins are arranged so as not to overlap each other in the left-right direction and the up-down direction (that is, the air supply direction by the air supply fan and the direction perpendicular to the air supply direction). If such a substrate 40 is used, the same effect as when the substrate 13 is used can be obtained.

1, 30 ... X-ray CT apparatus 3 ... X-ray tube 5 ... X-ray collimator 7 ... Subject 9 ... Rotary plate 11 ... X-ray detection module 13 ... Substrate 15 Air supply fan 17 Exhaust fan 19a, 19b, 19c, 19d ... Radiating fins 21a, 21b, 21c, 21d ... DAS chip 40 ... Substrate 41a, 41b, 41c, 41d, 41e , 41f... DAS chips 43a, 43b, 43c, 43d, 43e, 43f.

Claims (7)

An X-ray CT apparatus that irradiates a subject with X-rays, detects an X-ray dose transmitted through the subject, and constructs a tomographic image of the subject based on the X-ray dose,
An X-ray detection element for detecting the X-ray dose;
A substrate on which an analog-digital conversion element that converts information obtained by the X-ray detection element is mounted;
A plurality of radiating fins provided on the substrate for cooling the analog-digital conversion element;
An air supply fan for sending cooling air to the heat dissipating fins;
Have
The plurality of radiating fins are arranged on the substrate at positions shifted from each other in a direction substantially perpendicular to the air supply direction so as not to overlap the air supply direction of the air supply fan. X-ray CT system.   The X-ray CT apparatus according to claim 1, wherein the plurality of radiating fins are further displaced in the front-rear direction with respect to the air feeding direction of the air feeding fan on the substrate.   3. The analog-digital conversion element is provided on both surfaces of the substrate, and the analog-digital conversion element is disposed at a position that does not overlap each other with the substrate interposed therebetween. X-ray CT system. A plurality of the substrates are arranged with respect to the air supply direction of the air supply fan,
4. The X-ray according to claim 1, wherein the plurality of substrates are provided at positions shifted from each other in a direction substantially perpendicular to an air supply direction of the air supply fan. 5. CT device. An exhaust fan that exhausts the warm air after cooling the heat dissipating fins;
The X-ray CT apparatus according to claim 1, wherein an exhaust direction of the exhaust fan is the same direction as an air supply direction of the air supply fan. An exhaust fan that exhausts the warm air after cooling the heat dissipating fins;
The X-ray CT apparatus according to any one of claims 1 to 4, wherein an exhaust direction of the exhaust fan is substantially perpendicular to an air supply direction of the air supply fan. An exhaust fan that exhausts the warm air after cooling the heat dissipating fins;
The X-ray CT apparatus according to claim 1, wherein an exhaust direction of the exhaust fan is opposite to an air supply direction of the air supply fan.

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