JPH08131430A - X-ray ct system - Google Patents

Abstract

PURPOSE: To make a doctor, etc., easy to approach a patient by forming an upper or lower part on the left or right side that is a non-supporting side in arc shape along by approximating the outermost peripheral terminal of the rotational locus of a scanner rotating part and providing an approach space on its outside. CONSTITUTION: Scanner supporting structure is formed in cantilever supporting structure, and the external shape of a scanner 1 on the unsupported side is formed in circular arc or arc shape along by approximating the outermost peripheral terminal of the rotational locus of the scanner rotating part. In this way, a part equivalent to a scanner corner part can be eliminated, and it can be set as the approach space AS, which can be used as a treating or working space for the doctor, etc., or an installing space for every kind of equipment, etc. In this X-ray CT system, the patient is positioned by moving to the inside of a scanner opening 2 in a state being laid down on the table 4a of a bed 4 with the table 4a, and measurement can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention In the present invention, a doctor, an attendant, etc. (hereinafter referred to as a doctor, etc.) is located in the immediate vicinity of a subject on a bed, and performs some treatment or work on the subject. In this case, the present invention relates to an X-ray CT apparatus that facilitates approaching a subject.

[0002]

2. Description of the Related Art In an X-ray CT apparatus, leakage X from an X-ray tube
In addition to X-rays, many leaked X-rays, such as scattered X-rays from peripheral devices related to X-ray measurement and the patient on the bed, are generated. Since it is premised that a person does not enter the X-ray CT measurement room, the scanner has a structure considering only the measurement of the subject.

However, conventionally, for the purpose of positively improving diagnostic ability, X-ray measurement and dynamic measurement in which a high-concentration vascular shadow enhancer is injected into a blood vessel of a subject, or an infant or movement is intense. In the measurement of a subject or the like who needs some kind of intervention during the measurement, it is necessary for a doctor or the like to be near the subject and perform necessary work even during the X-ray measurement.

In recent years, in constant-cerebral-position surgery and various surgical treatments, various surgical operation techniques called IVR (Interventional Radiology) for performing medical treatment at the same time as measurement image diagnosis have been frequently performed. . In this case, a doctor or the like will perform various treatments and work near the subject during X-ray measurement.

The situation in the conventional X-ray CT apparatus when a doctor or the like performs various treatments and operations near the subject during the X-ray measurement will be described below. FIG. 11 is a perspective view of a conventional X-ray CT apparatus, in which (a) shows a scanner supporting portion projectingly arranged on both side surfaces of the scanner so as to support the scanner, and (b) shows The scanner support portion is provided inside the scanner cover without protruding. In both figures, 1 is a scanner, 2 is a scanner aperture, 3
Is a scanner support part, 4 is a bed, and 4a is a table of the bed 4.

In such an X-ray CT apparatus, a subject (not shown) is laid on the table 4a of the bed 4 and is moved and positioned inside the scanner opening 2 together with the table 4a. Alternatively, the position of the table 4a on which the subject is laid down is fixed, the scanner 1 is moved and positioned, and measurement is performed.

The scanner depth is 50 to 100c.
There is about m, and once the subject is brought into the scanner opening 2,
Once positioned, its approach to the subject is not straightforward and will be described below with reference to FIG.

FIG. 12 is an explanatory view of the position and approach of the doctor or the like with respect to the position of the X-ray CT apparatus when the doctor or the like performs various treatments and works in dynamic measurement or IVR.
The scanner 1, the bed 4, various treatments such as a doctor, a working position 121, and a subject 122 are shown from above the CT apparatus.

As shown in the figure, the measurement is carried in by bringing the measurement region 122a of the subject 122 into the depth of the scanner opening 2 (generally the intermediate position 2a in the depth direction of the scanner), and the measurement region 122a is also measured. It will be a place where direct treatment and work are performed. For this reason, the doctor or the like stands in a position 121 indicated by hatching in the figure on the side of the gantry opening 2 and in an unreasonable posture from the outside of the scanner 1 toward the intermediate position 2a in the scanner depth direction as indicated by the arrow. The examiner has to perform treatment and work, and if it takes a long time, the burden on the doctor or the like is extremely heavy.

Further, in particular, when performing an IVR procedure, there are many liquid injection packs, injection needles for catheters, etc. stabbed into the subject 122, and further, an ultrasonic diagnostic apparatus and an electrocardiograph are used. Since various measuring instruments such as are placed around the scanner 1, it is an important issue that doctors and others can easily approach the scanner 1 and many stands and instruments are easily placed. There is.

A solution to this problem is that there is a space around the scanner 1, especially on the floor (foot), that is, the scanner 1 itself becomes more compact, which is suitable. Conventionally, Japanese Patent Laid-Open No.
Ceiling-hung X-ray CT as described in Japanese Patent No. 352948.
There is a device.

[0012]

However, the above-mentioned conventional device has a problem that it requires a dedicated overhead traveling device and a large installation space on the ceiling side, which is extremely expensive.

An object of the present invention is to allow a doctor or the like to approach the subject easily when the doctor or the like is located in the immediate vicinity of the subject and various treatments or operations are performed in dynamic measurement or IVR procedures. Another object of the present invention is to provide an X-ray CT apparatus in which various stands, devices, etc. can be easily arranged around the scanner and which is cheaper than the conventional ceiling-suspended type.

[0014]

The above object is to support the scanner on the right or left side when viewed from the front side, and at least above or below the left or right side, which is the non-support side, of the rotation locus of the scanner rotating unit. This can be achieved by forming an outer shape in an arc shape which is close to the outermost peripheral edge and forming an approach space outside the outer shape.

Further, in the scanner to which the half measuring method is applied, the scanner is provided at the left or right vertical intermediate portion on the front or back side of the scanner in the non-rotating region of the X-ray tube or the X-ray detector of the scanner. And the outer shape of that portion is formed into a concave shape, and the approach space is provided outside thereof.

[0016]

By configuring the outer shape of the scanner so that the approach space is provided outside thereof, a doctor or the like is located in the immediate vicinity of the subject, and various treatments and works can be performed in dynamic measurement, IVR procedures, and the like. When performing, it becomes possible for a doctor or the like to easily approach the subject by using the approach space, and also when arranging various stands, devices, etc. around the scanner, it is easy to use the approach space. In addition, it is cheaper than the conventional ceiling-suspended type.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a first embodiment of an X-ray CT apparatus according to the present invention, in which a scanner support portion for supporting a scanner so as to be tilted is provided inside a scanner cover without protruding to both side surfaces of the scanner. The following is an example. In the figure, 1 is a scanner, 2 is a scanner opening, 3 is a scanner support portion, 4 is a bed, 4a is a table of the bed 4, and AS is an approach space.

As shown in the figure, the scanner support 3 of the present invention exists only on one side of the scanner 1 (in the conventional apparatus shown in FIG. 11, the scanner support 3 exists on both sides of the scanner 1).

That is, in the illustrated apparatus of the present invention, the scanner supporting structure is a cantilever supporting structure, and the outer shape of the scanner 1 on the non-supporting side is an arc or arc shape in which the outer shape of the scanner 1 is arranged close to the outermost peripheral end of the rotation locus of the scanner rotating portion. To form. As a result, the portion corresponding to the scanner corner portion existing in the conventional apparatus is eliminated, and the portion corresponding to the scanner corner portion is removed from the approach space A.
S is used as a treatment space for a doctor or the like in an IVR procedure, a work space, or an installation space for various devices.

In such an X-ray CT apparatus,
A subject (not shown) is moved to and positioned inside the scanner opening 2 together with the table 4a in a state of being placed on the table 4a of the bed 4, or a table on which the subject is placed. The position of 4a is fixed, the scanner 1 is moved and positioned, and measurement is performed as in the conventional device.

FIG. 2 is a diagram showing the details of the scanner portion in FIG. 1 from the front side of the scanner (the bed 4 side in FIG. 1), and the scanner cantilever support structure will be described in detail according to this figure. As shown in FIG. 11, usually, in an X-ray CT apparatus, the scanner support portions 3 that support the scanner 1 so as to be tiltable are provided on both sides of the scanner 1, and the shape of a scanner cover that covers them (outside the scanner). The shape was a quadrangle when viewed from the front (or back) side of the scanner. That is, there were corners above and below the left and right sides.

In the apparatus of the present invention, the scanner support structure is a cantilever support structure, and the approach space AS is provided by eliminating the upper and lower corners on either side of the scanner. Therefore, the scanner 1 is constructed as shown in the drawing. There is. In FIG.
The X-ray from the X-ray tube unit 5 is narrowed by the collimator unit 6 in the slice direction (scanner depth direction) to form an X-ray fan beam. An X-ray detector unit 7 arranged at a position facing the X-ray tube unit 5 converts X-rays transmitted through a subject (not shown) into an electric signal, and the electric signal is detected by a detection circuit unit 8. A / after being amplified
The image is D-converted and sent to an image processing unit (not shown) for image reconstruction.

Inside the scanner 1, the units 5 to 5 are provided.
Each of 8 is fixed on a rotary base 9, and this rotary base 9 is fixed to a scanner base 11 via a rotary bearing 10 having a bearing structure. As a result, the rotation base 9 can be freely rotated, and the units 5 to 8 are integrally rotated so that measurement can be performed.

These units 5 to 8 (measuring unit)
Is a circular area (scanner rotation area) indicated by reference numeral 100, in which the units 5 to 8 correspond to the thickness of the scanner 1 in the slice direction. It is placed within the size range. Although not shown, various circuits such as a rotation drive device for rotating the rotation base 9 and an interface to be arranged on the stationary side are located outside the circular area 100, particularly on the scanner support portion 3 side on the right side of the circular area 100 in the drawing. Is located in. Specifically, they are arranged in the upper right and lower right corners in the drawing inside the scanner cover 101, but when the dimension in the left-right direction in the drawing is insufficient, the dimension from the center of the scanner opening 2 to the scanner support portion 3 Alternatively, the dimension in the depth direction of the scanner 1 is increased to secure the arrangement space.

The scanner base 11 is connected to the scanner supporting portion 3 via a rotary shaft 31. The scanner support portion 3 is provided with means for driving the rotary shaft 31 to angle (raise and lower) the scanner base 11, for example, a gear or belt mechanism, and various drive mechanisms such as a hydraulic mechanism. .

In the illustrated example, the rotary shaft 31 is connected to the side of the scanner base 11 so that it can be moved up and down, but a gear mechanism for changing the angle, a hydraulic pump or the like (not shown) is directly attached to the lower end of the scanner base 11. It may be attached so that it can be moved up and down. In this case, the structure for raising and lowering the scanner supporting unit 3 is omitted, and the scanner supporting unit 3 is configured to simply support the entire scanner 1 in a cantilever manner. In any case, the scanner support 3 is finally attached to the floor surface 1 via the scanner fixing base 32.
It is fixed at 02.

With the above arrangement, the shape of the scanner cover 101 on the side opposite to the scanner supporting portion 3 (outer shape of the scanner) should be as close as possible to the circular scanner rotation area 100 as indicated by the chain line. The dead space in the scanner cover 101 is almost eliminated. Therefore, the external shape of the scanner as shown in FIG. 1 can be finally formed, that is, the portion corresponding to the scanner corner portion existing in the conventional apparatus can be eliminated, and the approach space obtained at the scanner corner portion corresponding portion can be eliminated. AS, IV
It can be used as a treatment space for doctors and the like in R procedures, a work space, or an installation space for various devices.

As shown in FIG. 3, the scanner fixing base 32 may be divided into a floor surface fixing portion 32a and a supporting portion fixing portion 32b, and both of them may be rotatable by a rotary bearing or the like. In this case, a gear mechanism or various rotary drive mechanisms may be added to the support portion fixing portion 32b to electrically retract the scanner 1.

According to this, the scanner 1 as a whole can be rotated about the scanner supporting portion 3 by the rotation operation of the supporting portion fixing portion 32b, and as shown in FIG. It is possible to retreat from the position in the direction of the arrow, and it is possible to further increase the treatment of the doctor or the like, the working space or the installation space of various devices, etc., and the treatment or the work of the doctor or the like is further facilitated.

FIG. 3 also shows a roller 12a positioned below the center of the scanner 1 and avoiding the rotating area 100.
Also, an example will be shown in which the roller support 12 including the support 12b that connects the roller 12a to the scanner base 11 is provided to reduce the support of the scanner 1 by the scanner support 3. That is, the cantilevered support structure generally has a larger and more complicated structure as the weight of the structure such as the scanner 1 increases. Therefore, the roller support 12 is provided. According to this, since most of the total weight of the scanner 1 is supported by the roller support 12, the side of the scanner base 11 and the scanner support 3 are supported. The connection structure with and is simplified. In this case, the scanner support portion 3 mainly functions as a shaft fulcrum when the scanner 1 is retracted and rotated.

5 (a) to 5 (c) show various modifications of the first embodiment. (A) to (c) show an example in which the scanner support portion 3 that is cantilevered is out of the scanner cover 101. Of these, in (a) and (b), the scanner support part 3 is formed in an L-shape, and the roller support cover 14 in which the roller support 12 in FIG. Here is an example: In addition,
With respect to those illustrated in (a) and (b), the scanner 1 may be electrically retracted as in the case of FIG. 3, and 16 is a foot switch in that case, which is an L-shaped mechanism of the scanner support portion 3. It is provided at the tip of the portion 15. According to this, even if a doctor or the like is performing any treatment, it is possible to easily retract the scanner 1 with an empty foot. (B) is different from the scanner supporting portion 3 having a scanner raising / lowering means, and is simply a support rod 1 having no scanner raising / lowering means.
An example in which 7 is added to the opposite side of the scanner support 3 is also shown,
According to this, the strength of the scanner support portion 3 is reduced.

In the above-described first embodiment, the scanner support structure is a cantilever support structure, and the outer shape of the scanner 1 on the non-support side is an arc or a line which is arranged close to the outermost peripheral end of the rotation locus of the scanner rotating portion. Although it is formed in an arc shape and the approach space AS is provided, the invention is not limited to this. less than,
An embodiment of the device of the present invention having no cantilever support structure will be described.

FIG. 6 shows a second X-ray CT apparatus according to the present invention.
1 is a perspective view showing an embodiment in which a scanner supporting portion for supporting a scanner so as to be tilted is provided inside a scanner cover without protruding to both side surfaces of the scanner. In the figure, 1 is a scanner, 2 is a scanner aperture, 4 is a bed, 4a is a table of the bed 4, and AS is an approach space.

That is, in the device of the present invention, a concave portion is formed in the left-right direction on the left side or right side of at least the front side or the back side of the scanner 1, here, on the left side on the front side of the scanner 1, in the up-down direction middle portion and in the left-right direction, and approaches there. Space AS
It can be used as a treatment space for a doctor or the like in an IVR procedure, a work space, or an installation space for various devices. FIG. 7 is a diagram showing a state of treatment and work by a doctor or the like in the apparatus of the present invention shown in FIG. 6, in which the doctor or the like competes with the approach space AS from the shaded position 121a in the figure to the measurement site pointed by an arrow. Perform necessary measures and work.

In such an X-ray CT apparatus,
A subject (not shown) is moved to and positioned inside the scanner opening 2 together with the table 4a in a state of being placed on the table 4a of the bed 4, or a table on which the subject is placed. The point where the position of 4a is fixed, the scanner 1 is moved and positioned, and measurement is performed is the same as in the above-described first embodiment.

Here, the recessed portion forming the approach space AS is, concretely, the left and right portion of the scanner vertical direction intermediate portion of the front portion of the scanner cover which is in contact with the cover of the scanner opening 2 portion and the scanner cover portion around it. It is formed by making it smaller than the dimension in the depth direction,
Hereinafter, a specific example of a scanner configuration that enables this will be described.

First, an example in which the concave portion is realized by using a half measuring method as a measuring method will be described. That is, normally, the measurement method using the X-ray CT apparatus measures the entire circumference of the subject from 360 ° directions and reconstructs the image, but the half measurement method requires measurement from the entire circumference of the subject. A measurement method not performed will be described with reference to FIG. FIG. 8 shows the positional relationship between the X-ray tube (including X-ray generating means other than the X-ray tube) 5 and the X-ray detector 7 in the normal half measurement method. Tube 5 first 5
Start measurement from the position of st, for example, 5en clockwise
Measure while rotating to the position of d. That is, the half measurement method is a known measurement method in which an image is reconstructed if the rotation measurement of the opening angle of 180 degrees + X-ray fan beam is performed in this way, and the angle indicated by θ1 in the drawing is the rotation of the X-ray tube 5. This is the angle (area) that is not used.

In the present invention, such a half measuring method is applied as shown in FIG. That is, here, it is assumed that the X-ray tube position 5st at the start of measurement of the half measurement method is a position moved counterclockwise by an angle corresponding to 1/2 of the opening angle of the X-ray fan beam (others). Is the same as in FIG. 8). According to this, there is no rotational movement of the X-ray tube 5 in the shaded area 91 in the figure, and therefore the corresponding portion of this non-rotating area 91 is a space through which only the detector system with a small depth dimension can pass in the slice direction. Since it suffices to have it, the recessed portion can be formed and the approach space AS is provided. Although FIG. 9 shows the case where the non-rotating region 91 of the X-ray tube 5 exists on the left side of the drawing, the X-ray tube position 5st, the rotation direction of the X-ray tube 5, and the X-ray detector 7 at the start of measurement. It is also possible to set to the right side in the figure by changing

In the apparatus of the present invention, in addition to applying the half measurement method shown in FIG. 9, the X-ray detection circuit is moved to the back side of the scanner and arranged, or the X-ray detection circuit is arranged around the scanner circumference. The X-ray tube 5 is arranged so as to be widened in the direction, and is set smaller than the dimension of the scanner in the depth direction occupied by the X-ray tube 5.
By configuring the space on the front side from the center position of the scanner depth dimension to be as wide as possible, a wider approach space can be provided at the corresponding position of the non-rotating region 91. Also, by moving the X-ray tube and collimator unit to the rear side of the scanner and arranging them,
The X-ray tube and the collimator unit can be configured such that the space on the front side from the scanner depth dimension center position is wide, which is effective for providing a wider approach space.

Further, with the external shape of the scanner (scanner cover shape) shown in FIG. 6, measurement from the entire circumference of the subject in the direction of 360 degrees becomes impossible. Therefore, approach space A
The cover for setting S can be replaced with a flat plate-like cover (a cover similar to the conventional device) in which the approach space AS is not set, and measurement from the 360-degree direction can be possible. Further, in the device of the present invention to which the half measurement method is applied,
In addition to making it possible to control the X-ray tube position at the start of measurement,
By making it possible to use a cover in which the set position of the approach space AS is changed accordingly, it is possible to select the approach space AS at various positions.

Next, another example of the scanner configuration for providing the approach space AS will be described with reference to FIG. FIG. 10 shows an electronic scanning type scanner which is formed in a substantially semi-root shape (vertical cross-sectional shape of the funnel) except for the X-ray detection section, by installing the electronic scanning type scanner with its arcuate surface facing left or right. An example in which the approach space AS is provided on the left side except the X-ray detection unit will be described.

10A is a front view of the electronic scanning type scanner, FIG. 10B is a left side view of FIG. 10A, and FIG. 10C is a schematic top view of the electronic scanning type scanner. In FIG. 10, 111 is a scanner, 112 is a scanner aperture, and 114
Is a bed, 115 is an X-ray generator, 117 is an X-ray detector, 1
Reference numeral 18 is a detection circuit, 201 is a scanner cover, and AS is an approach space.

Such an electronic scanning type scanner 111 is
Although the measurement can be completed in a short time and the measurement can be started quickly because there is no scanner rotation mechanism, the scanner opening 112 is only on the bed 114 side, and the approach from the scanner back side is impossible. In the present invention, the installation state (orientation) of the electronic scanning type scanner 111 is changed from the installation up to that point with the arc-shaped surface facing downward, and the arc-shaped surface is directed to the left or right side, to the right side in the illustrated example. It was installed. As a result, the approach space AS is provided on the right or left side, that is, on the left side in the illustrated example, except for the X-ray detector (X-ray detector 117, detection circuit 118 portion).

The approach space AS will be further described. In the electronic scanning type scanner 111 of this type, as shown in (b), the X-ray generation unit 115 corresponding to the X-ray tube has an X-ray detector 117 and a detection circuit 118. It requires a significantly larger installation space compared to. Therefore, the detection circuit 118 is connected to the detector 1
If the scanner cover 201 has a shape as shown by the alternate long and short dash line when the detector 117 is installed on the back side of the scanner with respect to the scanner front side, a vacant space is created on the front side of the scanner on the detector 117 side. Can be secured,
The approach shown by the arrow a in (c) is possible. Further, as shown in (c), an empty space is also formed on one side of the scanner rear portion, so that the approach space AS can be secured in this portion as well, and the approach shown by the arrow B can be performed. Further, in the installation state (orientation) of the electronic scanning type scanner 111, the scanner opening 2 was a bell-shaped closed area in the installation up to that time with the arc-shaped surface facing downward, but as shown in the figure. In the installed state (orientation), the approach space AS indicated by a horizontal stripe pattern in the scanner opening 2 part
(See (a) and (b)) can be secured.

In each of the above approach spaces AS, I
It can be used as a treatment space for a doctor or the like in a VR procedure, a work space, or an installation space for various devices. The approach space AS is also useful for observing the condition of the subject during measurement.

In the above embodiment, the case where the present invention is applied to the scanner of the third generation system has been described, but the invention can be similarly applied to the scanner of a system different from that. Regarding the X-ray source, not only a general X-ray tube or that shown in FIG. 10 but also an electrode switching type X-ray tube as shown in JP-A-55-46408 or JP-A-58-115738 is shown. Various types such as those based on the electron gun rotary movement type X-ray generation system can be applied.

[0047]

As described above, according to the present invention, since the outer shape of the scanner is configured so that the approach space is provided outside thereof, a doctor or the like is located in the immediate vicinity of the subject, When performing various treatments and operations in dynamic measurement, IVR procedures, etc., a doctor or the like can easily approach a subject using the approach space,
Also, when various stands, devices, etc. are arranged around the scanner, there is an effect that the space is utilized to facilitate the operation and the cost is lower than that of the conventional ceiling-suspended type.

In particular, in the X-ray CT apparatus illustrated in FIG. 1, since the open area of the foot portion of the scanner is large, it is more advantageous to arrange various stands, devices and the like necessary for various treatments and operations. Has the effect of becoming.

Further, in the X-ray CT apparatus illustrated in FIGS. 9 and 10, since the X-ray generation region and the approach region of a doctor do not overlap each other, measurement is performed from the entire circumference of the subject in the 360 ° direction. There is also an effect that the radiation dose of a doctor or the like can be reduced as compared with the case of performing.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the device of the present invention.

FIG. 2 is a diagram showing details of a scanner portion in FIG. 1 from the front side of the scanner.

FIG. 3 is a front view of a scanner showing a modified example of the scanner shown in FIG.

4 is a perspective view showing an example of an apparatus of the present invention including the scanner shown in FIG.

FIG. 5 is a perspective view showing various modifications of the first embodiment of the device of the present invention.

FIG. 6 is a perspective view showing a second embodiment of the device of the present invention.

FIG. 7 is a diagram showing a state during treatment and work of a doctor or the like in the device of the present invention shown in FIG.

FIG. 8 is an explanatory diagram of a normal half measurement method.

FIG. 9 is an explanatory diagram of a half measuring method for achieving the second embodiment of the device of the present invention.

FIG. 10 is a diagram showing an example of an apparatus of the present invention using an electronic scanning type scanner.

FIG. 11 is a perspective view of a conventional device.

FIG. 12 is an explanatory diagram of the position and approach of the doctor or the like with respect to the position of the X-ray CT apparatus when the doctor or the like performs various treatments and works in the IVR or the like.

[Explanation of symbols]

 1,111 Scanner 2,112 Scanner opening 3 Scanner support 4,114 Bed 4a Bed table 5,115 X-ray tube unit, X-ray tube, X-ray generator 6 Collimator unit 7,117 X-ray detector unit, X Line detector 8,118 Detection circuit unit, detection circuit 9 Rotation base 10 Rotation bearing 11 Scanner base 12 Roller support 12a Roller 12b Support 14 Roller support cover 15 L-shaped mechanism of scanner support 16 Foot switch 31 Rotation axis 32 Scanner fixing base 32a Floor fixing part 32b Support fixing part 100 Circular area (scanner rotating area) 101, 201 Scanner cover 102 Floor AS approach space

Claims (2)

[Claims] 1. An arc shape which is supported on the right side or the left side when viewed from the front side, and at least the upper side or the lower side of the left side or the right side which is the non-support side is arranged close to the outermost peripheral end of the rotation locus of the scanner rotating unit. An X-ray C, characterized by comprising a scanner having an outer shape formed on the outside and an approach space provided outside thereof.
T device. 2. The non-rotating region of the X-ray tube or the X-ray detector in the scanner to which the half measurement method is applied is made to correspond to the left or right intermediate portion on the left or right side on the front side or the back side, and the outer shape of that portion. An X-ray CT apparatus comprising a scanner having a concave shape and having an approach space outside thereof.