JP5072223B2 - X-ray CT system - Google Patents

Description

  The present invention relates to an X-ray CT apparatus including an X-ray CT mount with improved strength and rigidity.

  As one of medical diagnostic apparatuses, there is an X-ray CT (computed tomography) apparatus (see, for example, Patent Document 1). The X-ray CT apparatus is configured by incorporating an X-ray tube, a detector, a power source and signal processing components in a gantry. In addition, an imaging port for imaging the subject is formed at the center of the gantry of the X-ray CT apparatus. Then, parts such as an X-ray tube and a detector are stored in a box-shaped storage member that is a component of the gantry with the imaging port interposed therebetween.

  Further, in the helical scan type X-ray CT apparatus, components such as an X-ray tube and a detector rotate around the subject, and the components such as the X-ray tube and the detector form a rotating part. ing. Further, the entire X-ray CT apparatus is covered with a cover for protection.

  FIG. 14 is a front view showing a configuration of a conventional X-ray CT apparatus, and FIG. 15 is a side view of the conventional X-ray CT apparatus shown in FIG.

  The X-ray CT apparatus 1 includes a gantry 2. The gantry 2 is covered with a cover (not shown), and includes the rotating unit 3, the main frame 4, and the stand 5. The rotating unit 3 includes an electric component such as an X-ray tube, a high-pressure generator, a detector, a substrate for performing X-ray control and other controls, a power source, etc. (not shown) inside a rotating base 3a formed in a donut shape. Implemented and configured. The inside of the rotating unit 3 is set as the imaging region S. Further, the rotation base 3 a of the rotation unit 3 is mounted on the plate-shaped main frame 4 via the bearing 6. Further, shaft-like support portions 7 are provided on both side surfaces of the main frame 4. At this time, the axial direction of the support portion 7 is set to a horizontal direction and substantially perpendicular to the rotation axis of the rotation portion 3.

  On the other hand, the stand 5 is provided with a column 8 perpendicular to the installation surface of the X-ray CT apparatus 1, and an extendable columnar actuator 9 and an electrical component 10 housed in a metal box. And the support part 7 of the both sides | surfaces of the main frame 5 is supported by the support | pillar 8 of the stand 5 so that rotation to the axial direction of the support part 7 is possible. Further, the other part of the main frame 5 is supported by the actuator 9.

  As a result, the rotating unit 3 and the main frame 4 have a structure capable of tilting about the axis of the support unit 7 as a rotation center, and can capture two-dimensional image data of the subject at a desired angle.

Furthermore, an X-ray CT apparatus has been devised in which LM (Linear Motion) guides are provided on both sides of the stand in order to maintain the support strength of the gantry (see, for example, Patent Document 2).
JP 2000-116644 A JP-A-6-178769

  However, in a conventional X-ray CT apparatus equipped with a tiltable gantry, since there is a backlash between the tilt mechanism and the stand and the support portion, a high-definition image can be obtained in the entire radial region of the rotating portion. If it tries to do so, there is a problem that an error of backlash adversely affects the image. It is known that the influence of the play on the image tends to increase as the inner diameter of the rotating part, that is, the photographing range increases. However, the radial imaging range of the X-ray CT apparatus tends to increase. As a result, in order to reduce errors due to backlash, additional dampers and special positioning are performed at various locations, and extra parts and man-hours are required.

  Further, in recent X-ray CT apparatuses, a gantry in which a rotating part rotates at high speed has become mainstream, and even a slight unbalance may cause a large force. Therefore, balance adjustment has become important. However, it is difficult to set the unbalance to 0, and there is a need to reinforce the base as well as the entire base.

  Furthermore, in recent X-ray CT apparatuses, a two-dimensional detector having a detection element size of about 0.5 mm × 0.5 mm is used as a detector, and various factors including backlash in the tilt structure are included. The vibration of the gantry causes the influence of the vibration of the gantry on the image quality.

  In addition, in an X-ray CT apparatus equipped with a conventional LM guide, the strength of the gantry depends on the strength of the stand, no matter how much the rigidity of the LM guides on both sides of the stand is increased. It is difficult to improve the rigidity. Moreover, since it is necessary to use two expensive LM guides, it is not preferable in terms of cost.

  The present invention has been made in order to cope with such a conventional situation, and without increasing the strength of components such as a stand and a support portion that supports the rotating portion unnecessarily, the strength and strength of the gantry can be increased by simpler reinforcement. An object is to provide an X-ray CT apparatus capable of imparting rigidity.

X-ray CT apparatus according to the present invention, in order to achieve the above object, a rotating part of the non-tilting structure chromatic X-ray tube, a detector arranged to detect elements in a plurality of rows, wherein the rotating part a fixed frame for supporting lifting and placed on the floor, and a stand for supporting the fixed frame so as to prevent the tilt of the rotating portion, the stand includes a lower member fixed to the floor surface, the lower member And a support that supports both side surfaces of the fixed frame so as to prevent tilting of the rotating part, and the lower part of the fixing frame is directly fixed to the lower member to prevent tilting of the rotating part and the rotating part. And a fixing member that suppresses vibration with respect to the gantry.

Also, X-ray CT apparatus according to the present invention, in order to achieve the above object, a rotating part of the non-tilting structure chromatic X-ray tube, a detector arranged to detect elements in a plurality of rows, the said the rotating portion and the main frame for supporting lifting, while being directly bonded to a lower portion of the main frame so as to suppress vibrations to the gantry of the rotating portion with impede tilting of the rotating part, the lower part of the stand installed on the floor surface And a support that is fixed to the lower member and supports both side surfaces of the main frame so as to prevent tilting of the rotating portion .

Also, X-ray CT apparatus according to the present invention, in order to achieve the above object, the chromatic and equipment for X-ray generation, and a device arranged to detect elements for X-ray detection in a plurality of rows, the has a rotating part of the non-tilting structure, and a fixed frame for supporting lifting the rotary part via the rotary drive mechanism, the lower member the lower is fixed to the floor surface is fixed directly of the fixed frame, the fixed said fixed frame so as to prevent the tilt of the rotating portion and fixed by supporting the lower portion of the fixed frame a frame support points including at least three places, and a stand suppress vibrations on the gantry of the rotating part The fixed frame and the stand perform maintenance of at least one of the X-ray generation device and the X-ray detection device between one of the support points and the other support point. It is characterized in being configured to form a space Utame.

  In the X-ray CT apparatus according to the present invention, the strength and rigidity can be given to the gantry by simpler reinforcement without unnecessarily improving the strength of the components such as the stand and the support portion that support the rotating portion. .

  Embodiments of an X-ray CT apparatus according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a bird's-eye view showing a first embodiment of an X-ray CT apparatus according to the present invention, and FIG. 2 is a front view showing the configuration of the X-ray CT apparatus 20 shown in FIG. 3 is a side view of the gantry 21 shown in FIG.

  The X-ray CT apparatus 20 includes a gantry 21 that is a basic configuration. The gantry 21 is covered with a cover 22, and includes a rotating part 23, a main frame 24, and a stand 25. The rotating unit 23 includes an X-ray tube 27 and a detector 28 having a plurality of detecting elements inside a rotating base 26 formed in a hollow donut shape, as well as a high-pressure generator (not shown), X-ray control, and the like. It is configured by mounting electrical components such as a board for controlling and a power supply.

  The center of the rotating unit 23 is an imaging port 29 for imaging the subject, and an imaging region S having a diameter D is formed between the X-ray tube 27 and the detector 28. Further, the rotation base 26 of the rotation unit 23 is mounted on the plate-shaped main frame 24 via a bearing 30 which is an example of a rotation drive mechanism. As a result, the rotating unit 23 can rotate around the rotation axis of the bearing 30 with respect to the main frame 24.

  In addition, on both side surfaces of the main frame 24, side surface support portions 31 having arbitrary shapes are provided. Furthermore, a lower side support portion 32 is formed at least in a lower portion that is closer to the installation surface side of the X-ray CT apparatus 20 than the center of gravity of the main frame 24. The lower side support portion 32 is made of an element such as a metal plate, and fixes the main frame 24 and the stand 25 by screws, welding or the like.

  On the other hand, the stand 25 includes a lower member 33 and a support 34. The lower member 33 is provided with a pillar 34 substantially perpendicular to the installation surface of the X-ray CT apparatus 20 and, if necessary, an electrical component 35 housed in a metal box. The side support portions 31 on both side surfaces of the main frame 24 are supported by the columns 34 of the stand 25. Further, the lower side support portion 32 of the main frame 24 is integrated with the lower member 33 of the stand 25 and supported by the lower member 33.

  If the lower support portion 32 of the main frame 24 is supported by the lower member 33 of the stand 25, another member is provided between the lower member 33 of the stand 25 and the lower support portion 32 of the main frame 24. Or a component may be interposed. Accordingly, the lower support portion 32 on the installation surface side, which is the lower portion of the main frame 24, is fixed directly or indirectly to the stand 25.

  Moreover, the lower member 33 of the stand 25 is installed on the floor surface F, and is fixed to the floor surface F by an arbitrary fixing method. For example, the lower member 33 is fixed to the floor surface F by a total of five anchor bolts 36 in two locations near each column 34 and in the vicinity of the lower support portion 32 of the main frame 24. In this way, by fixing the stand 25 to the floor F at a portion where the load is applied, even if rotational vibration occurs during photographing, the relative vibration of the rotating unit 23 with respect to the gantry 21 is suppressed, and the image quality is deteriorated. Can be reduced. Further, the gantry 21 can be firmly fixed to the floor surface F.

  In the X-ray CT apparatus 20 as described above, the main frame 24 is supported at three points by the stand 25 on the lower side as well as on both sides. As a result, the backlash of the gantry 21 which has been a problem in the conventional X-ray CT apparatus 1 having the tilt structure with the main frame 24 supported by the stand 25 is eliminated, and the gantry has a large strength and rigidity by a simpler method. 21 can be given.

  Here, a brief description will be given of how the play is affected by the backlash of the gantry 21. If the vicinity of the outermost diameter of the imaging region S is displaced by 0.5 mm, it corresponds to the displacement at the corresponding portion of the tomographic image. It is difficult to observe tumors and bones that are smaller than the size. In addition, artifacts and rings are likely to appear in the image due to the displacement of the rotating unit 23. Therefore, when such an influence on the image occurs, the effect of the early diagnosis is diminished or a problem occurs in the treatment plan.

  On the other hand, in the X-ray CT apparatus 20, since the displacement of the rotating unit 23 and the main frame 24 can be suppressed to a small extent, the image quality performance of the image captured by the X-ray CT apparatus 20 is greatly improved and the reliability is improved. It becomes possible to raise. Moreover, according to the X-ray CT apparatus 20, since a fine part can be observed, the effect of early diagnosis is improved, and a treatment plan can be performed accurately and early.

  Furthermore, since the X-ray CT apparatus 20 does not employ a tilt structure, it is possible to reduce manufacturing costs and reinforce with a simple structure. In other words, the X-ray CT apparatus 20 can obtain great strength and rigidity without reinforcing structural members such as the stand 25 or providing special auxiliary support. In addition, it can sufficiently withstand high-speed rotation, and even if the size of the imaging region S increases in the radial direction, a high-quality image can be obtained. For this reason, a large and heavy multi-slice X-ray CT apparatus capable of collecting volume data is provided by including detectors 28 in which X-ray detection elements are arranged in a plurality of rows (preferably 60 rows or more). be able to. In particular, when the rotational speed of the rotating unit 23 is set to a speed faster than 0.5 seconds / rotation, when the width of the detection element of the detector 28 is 0.5 mm or less, an image to be reconstructed based on the output of the detector In the X-ray CT apparatus 20 having a large aperture in which the diameter D of the imaging region S is about 500 mm or more, the positional accuracy error of the edge portion of the imaging region S is 0. When trying to suppress to 5 mm or less, it is effective when the opening diameter of the subject insertion portion is 900 mm or more.

  Even if the tilt function is eliminated, since the 3D image processing technology is improved, an image of an arbitrary cross section can be easily reconstructed from slice image data in a single direction. Therefore, in recent years, rather than a request to provide a tilt function in an X-ray CT apparatus, the image can be accurately obtained following high-speed rotation of the rotating unit 23 and a large aperture of the imaging region S, which have not been a problem in the past. Development of technology to shoot images is desired. In this regard, the X-ray CT apparatus 20 shown in FIG. 1 can be said to meet the latter requirement.

  In particular, recent X-ray CT apparatuses have made it possible to reduce the slice thickness of tomographic images. Therefore, if mechanical back-and-forth and mechanical backlash are suppressed, a clearer and higher-resolution image is reconstructed and displayed. I think it can be done.

  In addition, as long as at least the lower part of the main frame 24 is fixed to the stand 25, the stand 25 may be supported at three or more points regardless of the upper and lower parts of the main frame 24. Further, the gantry 21 can be configured by bringing a desired part of the main frame 24 into line contact or surface contact with the stand 25.

  FIG. 4 is a front view showing a second embodiment of the X-ray CT apparatus according to the present invention, and FIG. 5 is a side view of the gantry 21 shown in FIG.

  The X-ray CT apparatus 20A shown in FIG. 4 differs from the X-ray CT apparatus 20 shown in FIG. 1 in that the spacer 40 is provided between the main frame 24 and the stand 25. Since other configurations and operations are not substantially different from those of the X-ray CT apparatus 20 shown in FIG. 1, the same components are denoted by the same reference numerals and description thereof is omitted.

  In the X-ray CT apparatus 20 </ b> A, a spacer 40 having a desired shape is provided between the main frame 24 and the stand 25. That is, the lower portion of the main frame 24 is fixed directly or indirectly to the stand 25 through the spacer 40.

  For this reason, according to the X-ray CT apparatus 20A, in addition to the same effects as those of the X-ray CT apparatus 20 shown in FIG. 1, it is possible to improve the assemblability by reducing the influence of variations in the shape and size of parts. Further, by providing the spacer 40, it is possible to correct a slight deviation that occurs when the stand 25 and the main frame 24 are assembled. For this reason, an image can be taken with higher accuracy.

  FIG. 6 is a front view of a gantry showing a third embodiment of the X-ray CT apparatus according to the present invention, and FIG. 7 is a side view of the gantry 21 shown in FIG.

  The X-ray CT apparatus 20B shown in FIG. 6 is different from the X-ray CT apparatus 20A shown in FIG. 4 in that the reinforcing column 50 is provided between the column 34 of the stand 25 and the lower member 33. Since other configurations and operations are not substantially different from those of the X-ray CT apparatus 20A shown in FIG. 4, the same configurations are denoted by the same reference numerals and description thereof is omitted.

  For example, two columnar reinforcing columns 50 are provided on the stand 25 of the X-ray CT apparatus 20B. That is, the reinforcing column 50 whose longitudinal direction is directed obliquely with respect to the length direction of the column 34 is provided between each column 34 and the lower member 33.

  If the reinforcing column 50 is provided on the stand 25 obliquely with respect to the length direction of the column 34 as in the X-ray CT apparatus 20B, the center of gravity of the gantry 21 can be increased by increasing the number of detection elements provided in the detector 28. Even if it comes to the rotating unit 23 side, the X-ray CT apparatus 20B can be stabilized.

  Note that the shape, number, and arrangement of the reinforcing columns 50 may be arbitrarily changed in order to stabilize the X-ray CT apparatus 20B.

  8 is a side view showing a modification of the gantry 21 shown in FIG. 6, and FIG. 9 is a top view of the gantry 21 shown in FIG.

  A stand 25 of the gantry 21 provided in the X-ray CT apparatus 20C shown in FIG. Further, each side surface side support portion 31 of the main frame 24 also has a shape protruding to the rotating portion 23 side. The support portions 31 support the side surface support portions 31 in a wider range on the rotating portion 23 side. Further, the protruding rotating part 23 side of each support column 34 is fixed to the lower member 33 of the stand 25 by a columnar reinforcing column 50A.

  For this reason, according to the X-ray CT apparatus 20C, each support column 34 protruding to the rotating portion 23 side is fixed to the lower member 33 of the stand 25 by the reinforcing column 50A, so that the X-ray CT apparatus 20B shown in FIG. Similarly, even if the center of gravity of the gantry 21 is on the rotating unit 23 side, the X-ray CT apparatus 20C can be stabilized.

  FIG. 10 is a front view of a gantry showing a fourth embodiment of the X-ray CT apparatus according to the present invention, and FIG. 11 is a side view of the gantry 21 shown in FIG.

  The X-ray CT apparatus 20D shown in FIG. 10 is different from the X-ray CT apparatus 20B shown in FIG. 6 in that a roller 60, a load cell 61, and a tachometer 62 for supporting the rotating unit 23 are provided. Since other configurations and operations are not substantially different from those of the X-ray CT apparatus 20B shown in FIG. 6, the same components are denoted by the same reference numerals and description thereof is omitted.

  In the X-ray CT apparatus 20 </ b> D, a roller 60 is provided in the vicinity of the rotating unit 23 of the stand 25. A part of the rotating unit 23 is contacted and supported by the rotating surface of the roller 60. Further, the rotation axis of the roller 60 is set in a direction parallel to the rotation axis of the rotation unit 23. For this reason, even if the rotating part 23 rotates, the roller 60 can support the rotating part 23 while rotating in the direction opposite to the rotating direction of the rotating part 23.

  The roller 60 is provided with a load cell 61 and a tachometer 62. The load cell 61 has a function of measuring a load applied to the roller 60, and the tachometer 62 has a function of measuring the rotation speed of the roller 60.

  According to the X-ray CT apparatus 20D as described above, the same effects as those of the X-ray CT apparatus 20B shown in FIG. 6 can be obtained. That is, even if the weight of the rotating unit 23 increases due to the increase in the number of detectors 28, the rotating unit 23 is supported by the rollers 60, so that the gantry 21 of the X-ray CT apparatus 20 </ b> D can be stabilized. In addition, you may support the rotation part 23 not only with the roller 60 but with rotation mechanisms, such as a bearing.

  Further, by measuring the load fluctuation of the rotating portion 23 applied to the roller 60 by the load cell 61, an abnormality in the balance of the rotating portion 23 can be detected. On the other hand, since the rotational speed of the rotating part 23 can also be indirectly detected by measuring the rotational speed of the roller 60 with the tachometer 62, variations and abnormalities in the rotational speed of the rotating part 23 can be detected. Is possible.

  FIG. 12 is a front view of a gantry showing a fifth embodiment of the X-ray CT apparatus according to the present invention, and FIG. 13 is an AA sectional view of the gantry 21 shown in FIG.

  The X-ray CT apparatus 20E shown in FIG. 12 differs from the X-ray CT apparatus 20B shown in FIG. 6 in the shape of the main frame 24A, the shape of the spacer 40A, and the method of supporting the rotating unit 23. Since other configurations and operations are not substantially different from those of the X-ray CT apparatus 20B shown in FIG. 6, the same components are denoted by the same reference numerals and description thereof is omitted.

  In the gantry 21 of the X-ray CT apparatus 20E, the main frame 24A is supported by three points of the two columns 34 and the spacer 40A and fixed to the stand 25. Furthermore, the main frame 24 </ b> A has a shape that is recessed toward the rotation center side of the rotation unit 23 from a straight line connecting adjacent support points. In other words, the main frame 24 </ b> A is provided with the cutout portion 70 that faces the center side of the rotation portion 23 so that the center side of the rotation portion 23 is wider than the support point side.

  The space 70 between the main frame 24A and the stand 25 or the electrical component 35 is widened by the cutout portion 70 of the main frame 24A, and maintenance of the equipment 71 provided in the rotating unit 23 for generating and detecting X-rays is performed. Maintenance space to do is secured. That is, a maintenance space is formed between adjacent support points of the main frame 24A.

  In particular, a DAS (data acquisition system) that collects X-ray detection data from the detector 28 and a device 71 associated with a high voltage generator that supplies a voltage to the X-ray tube 27 are connected to the main frame 24A side of the rotation base 26. There is something to be arranged. It is desirable that such maintenance work of the device 71 can be performed from the main frame 24A side. In order to cope with such circumstances, a maintenance space is formed on the gantry 21 of the X-ray CT apparatus 20E so that work can be performed from the main frame 24A side.

  For this reason, it is possible to easily perform maintenance of the equipment 71 on the gantry 21 of the X-ray CT apparatus 20E. If the cutout portion 70 of the main frame 24A is made larger, a wide maintenance space can be secured. However, the main frame 24A needs to be fixed to the stand 25 with sufficient strength.

  Therefore, conditions for securing a wider maintenance space while fixing the main frame 24A to the stand 25 with sufficient strength will be examined.

  As shown in FIG. 12, the width of the spacer 40A is a, and the width of the stand 25 is b. Further, the vertical height of the main frame 24A is set to c, the vertical length of the side support portion 31 in the vertical direction, and the vertical height of the side support portion 31 is set to the vertical height of the stand 25. h.

  In this case, regarding the support on both side surfaces of the main frame 24A, it is considered that if the value of c / h is empirically at least 1/2 or more, a practical and sufficient strength for securing image quality can be obtained. Specifically, it is considered that the spatial resolution capable of sufficiently suppressing the vibration of the rotating unit 23 and visually recognizing an object having a size of 0.5 mm can be secured. From the same point of view, it is considered that the support at the lower part of the main frame 24A should be a value of a / b between 1/2 and 1/4.

  On the other hand, as shown in FIG. 13, the spacer 40 </ b> A can have a shape protruding from the main frame 24 </ b> A in the direction of the rotation axis of the rotation unit 23. As described above, if the shape of the spacer 40A is a trapezoidal pillar, even when the weight of the rotating portion 23 is large, by securing a sufficient space while maintaining a maintenance space by setting the width a of the spacer 40A smaller. Is possible.

  Furthermore, the image quality can be improved while suppressing the vibration of the rotating unit 23 by supporting the rotating unit 23 with the bearings 30 at a plurality of locations. FIG. 13 shows an example in which the rotating unit 23 is supported at two locations by the main frame 24A via the bearing 30. Not limited to the example of FIG. 13, a method of supporting the rotating unit 23 so as to be sandwiched between both sides by a plurality of main frames is also possible.

  Note that a single X-ray CT apparatus can be configured by combining arbitrary components of the X-ray CT apparatuses 20, 20A, 20B, 20C, 20D, and 20E in the above embodiments. Conversely, some components of the X-ray CT apparatuses 20, 20A, 20B, 20C, 20D, and 20E may be omitted as long as necessary functions can be ensured.

The bird's-eye view which shows 1st Embodiment of the X-ray CT apparatus which concerns on this invention. The front view which shows the structure of the state which removed the cover of the mount frame in the X-ray CT apparatus shown in FIG. The side view of the mount frame shown in FIG. The front view which shows 2nd Embodiment of the X-ray CT apparatus which concerns on this invention. The side view of the mount frame shown in FIG. The front view of the mount frame which shows 3rd Embodiment of the X-ray CT apparatus which concerns on this invention. The side view of the mount frame shown in FIG. The side view which shows the modification of the mount frame shown in FIG. The top view of the mount frame shown in FIG. The front view of the mount frame which shows 4th Embodiment of the X-ray CT apparatus concerning this invention. The side view of the mount frame shown in FIG. The front view of the mount frame which shows 5th Embodiment of the X-ray CT apparatus concerning this invention. AA sectional drawing of the mount frame shown in FIG. The front view which shows the structure of the conventional X-ray CT apparatus. The side view of the conventional X-ray CT apparatus shown in FIG.

Explanation of symbols

20, 20A, 20B, 20C, 20D, 20E X-ray CT apparatus 21 Mounting base 22 Cover 23 Rotating part 24 Main frame 25 Stand 26 Rotating base 27 X-ray tube 28 Detector 29 Imaging port 30 Bearing 31 Side support part 32 Lower side Support section 33 Lower member 34 Support column 35 Electrical component 36 Anchor bolt 40 Spacer 50, 50A Reinforcement pillar 60 Roller 61 Load cell 62 Tachometer 70 Notch 71 Equipment S Imaging area F Floor surface

Claims (16)

And X-ray tube, and a rotating part of the non-tilting structure chromatic and arranged detecting elements in a plurality of rows detectors, and
A fixed frame for supporting lifting the rotating part,
A stand installed on the floor and supporting the fixed frame to prevent tilting of the rotating part ;
The stand is
A lower member fixed to the floor,
Supports fixed to the lower member and supporting both side surfaces of the fixed frame to prevent tilting of the rotating part ,
A fixing member that prevents tilting of the rotating part by directly fixing a lower part of the fixing frame to the lower member, and suppresses vibration of the rotating part with respect to a gantry;
An X-ray CT apparatus comprising: The X-ray CT apparatus according to claim 1, wherein the lower member is fixed to the floor surface with an anchor bolt in the vicinity of the support column and in the vicinity of the fixing member. The X-ray CT apparatus according to claim 1, wherein the fixed frame is supported by at least three points by the stand. The detection element of the detector has a width of 0.5 mm or less,
The X-ray CT apparatus according to claim 1, wherein the rotating unit rotates at a speed faster than 0.5 seconds / rotation by a rotation driving mechanism. The X-ray CT apparatus according to claim 1, wherein the rotating portion has an opening diameter of the subject insertion portion of 900 mm or more. The X-ray CT apparatus according to claim 1, wherein the stand has a reinforcing material between the support column and the lower member. The fixed frame is configured to support the rotating unit via a rotation drive mechanism,
The X-ray CT apparatus according to claim 1, further comprising a rotation mechanism that is provided on the stand and supports a part of the rotation unit. The X-ray CT apparatus according to claim 1, wherein the fixing member has a shape protruding from the fixing frame toward the rotating portion. The fixed frame is
Has a lower side support part below the center of gravity of its own,
The lower member of the stand is
The lower support portion is supported by being integrated with the lower support portion of the fixed frame.
The X-ray CT apparatus according to claim 1. The X-ray CT apparatus according to claim 1, wherein the fixed frame is configured to support the rotating unit at at least two locations. And X-ray tube, and a rotating part of the non-tilting structure chromatic and arranged detecting elements in a plurality of rows detectors, and
A main frame for supporting lifting the rotating part,
A lower member of a stand installed on the floor and directly joined to the lower part of the main frame so as to prevent tilting of the rotating part and to suppress vibration of the rotating part with respect to a gantry;
Supports fixed to the lower member and supporting both side surfaces of the main frame to prevent tilting of the rotating part ,
An X-ray CT apparatus comprising: And equipment for X-ray generation, the rotating portion of the non-tilting structure have a, a device arranged in a plurality of rows of detector elements for X-ray detection,
A fixed frame for supporting lifting the rotary part via the rotary drive mechanism,
Includes a lower member the lower is fixed to the floor surface is fixed directly of the fixed frame, said rotating portion by supporting the fixed frame at the support points of the lower and including at least three positions of the fixed frame A stand for fixing the fixed frame to prevent tilting and suppressing vibration of the rotating unit with respect to the gantry;
The fixed frame and the stand have a space for performing maintenance of at least one of the device for generating X-rays and the device for detecting X-rays between one of the support points and another support point. An X-ray CT apparatus characterized by being configured to form. 13. The X-ray CT according to claim 12, wherein the fixed frame has a shape such that a space for performing the maintenance is wider on a rotation center side of the rotating portion than a straight line connecting adjacent support points. apparatus. The X-ray CT apparatus according to claim 12, wherein the fixed frame has a cutout portion on a rotation center side of the rotation portion. The fixed frame is configured to support the lower part of the rotating part by one of the support points, and the width of the support part in the lower part is 1/2 to 1/4 of the width of the stand. The X-ray CT apparatus according to claim 12. The fixed frame is configured to support the side portion of the rotating portion by one of the support points, and the length of the support portion in the side portion is the height of the stand including the length of the support portion. The X-ray CT apparatus according to claim 12, wherein the X-ray CT apparatus is longer than ½ of.

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