JP3391441B2 - Computed tomography equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer tomography apparatus (generally referred to as a CT scanner) which is one of non-destructive inspection apparatuses, and more particularly, to improving image quality and diversifying imaging. The present invention relates to a computer tomography apparatus capable of contributing.

[0002]

2. Description of the Related Art In a conventional industrial computed tomography apparatus, which is one of nondestructive inspection apparatuses, a translate / rotate method (hereinafter referred to as a TR method) for causing a subject to perform a translation operation and step rotation. ),
Alternatively, a rotate / rotate system (hereinafter, referred to as an RR system) in which a subject is rotated only has been mainly adopted.

FIG. 10 is a schematic diagram showing an example of the configuration of a typical conventional RR type computer tomography apparatus of this type.

In FIG. 10, X-rays generated from an X-ray tube 201 are formed into a fan-shaped X-ray beam 203 by a collimator 202. And in this X-ray beam,
The object 205 is rotated and scanned along the fan surface by the rotary table 204, and the transmission data detected by the detector 206 and digitally converted by the data collecting unit 207 is used by the data processing unit 208 on the fan surface of the object 205. To obtain a cross-sectional image of.

Here, the rotary table 204 is rotatably fixed to the vertically movable frame 209, and is vertically movable.
The target tomographic plane of the subject 205 is changed by being moved up and down by the up-and-down drive unit 211 together with 09.

[0006]

However, in the conventional computer tomography apparatus, when the vertical movement is performed to change the target tomographic plane, the imaging tomographic plane (= center plane of X-ray beam 203 = fan plane). ) There is a possibility that a shift of the rotation center position may occur, resulting in a false image in the image or a reduction in the image resolution. This is caused by the fact that the rotating shaft 212 and the direction of vertical movement do not exactly match.

On the other hand, recently, the demand for inspection using a computer tomography apparatus has become stronger and stronger.
05 types and inspection contents are also expanding. For this reason, there is a tendency that the demand for higher image quality and the demand for diversification of handling of the subject 205 are increasing.

An object of the present invention is to provide a computer tomography apparatus capable of contributing to high quality images and diversification of imaging.

[0009]

In order to achieve the above object, according to the invention of claim 1, a radiation source for generating a radiation beam and a radiation detector for detecting the radiation beam from the radiation source with a spatial resolution. And rotating means for rotating the subject within the radiation beam, and reconstructing means for creating a cross-sectional image of the subject based on transmission data from multiple directions of the subject obtained by the radiation detector. in a computer tomography device configured to include the
The rotating means includes a table on which the subject is placed and the table.
Rotation mechanism to rotate the table and non-rotation with the table
The slip ring mechanism disposed between the
Fixed to the bull and changing the mounting angle of the subject
Mechanism and the tilting mechanism through the slip ring mechanism
Tilt control to control the mounting angle of the subject by sending electric power to the
And a section.

[0010]

[0011]

Therefore, in the computer tomography apparatus of the first aspect of the present invention, the computer tomography apparatus is arranged between the table and the non-rotating portion.
Power is supplied to the tilting mechanism through the installed slip ring mechanism.
By sending and controlling the mounting angle of the subject,
Easy to use the tilt control unit while keeping it on the table
It is possible to change the angle of the target fault plane by changing the mounting angle.
Can contribute to higher image quality and diversification of shooting
Will be things.

In order to achieve the above object, a second aspect of the present invention is provided.
According to the invention, a radiation source for generating a radiation beam and the radiation source are provided.
Detects a radiation beam from a radiation source with spatial resolution
Radiation detector and rotating the subject within the radiation beam
Rotating means for rotating and the object obtained by the radiation detector.
Based on transmission data from multiple directions of the sample,
And a reconstruction means for creating a sectional image.
In a Pewter tomography apparatus, the rotating means is
Rotate the table on which the subject is placed and the table
Installed between the table and the non-rotating part.
Slip ring mechanism and fixed to the table,
Attaching / detaching part for attaching / detaching the subject, and the slip ring machine
Power is supplied to the attachment / detachment section through the structure to attach / detach the subject.
And a detachment control unit for controlling,
It

Therefore, in the computer tomography apparatus according to the second aspect of the present invention, the computer tomography apparatus is arranged between the table and the non-rotating portion.
Power is sent to the attachment / detachment unit through the slip ring mechanism provided.
By controlling the attachment / detachment of the subject, the attachment / detachment control section
The object can be easily attached and detached, and the image quality can be improved.
This will contribute to quality improvement and diversification of shooting.

In order to achieve the above object, a third aspect of the present invention is provided.
According to the invention, a radiation source for generating a radiation beam and the radiation source are provided.
Detects a radiation beam from a radiation source with spatial resolution
Radiation detector and rotating the subject within the radiation beam
Rotating means for rotating and the object obtained by the radiation detector.
Based on transmission data from multiple directions of the sample,
And a reconstruction means for creating a sectional image.
In a Pewter tomography apparatus, the rotating means is
Rotate the table on which the subject is placed and the table
Installed between the table and the non-rotating part.
Slip ring mechanism and fixed to the table,
A heating unit that changes the temperature of the subject;
Power is supplied to the heating unit through the
And a control unit that controls the state of the degree.
And

Therefore, in the computer tomography apparatus according to the third aspect of the present invention, the computer tomography apparatus is arranged between the table and the non-rotating portion.
Electric power is sent to the heating section through the slip ring mechanism installed.
By controlling the temperature condition of the subject,
It is possible to change the temperature while placing on the table.
Contributes to higher quality images and diversification of shooting.
Will be In order to achieve the above-mentioned object, the invention of claim 4
In the light, a radiation source that produces a radiation beam and the radiation
Detects a radiation beam from a radiation source with spatial resolution
Rotate the subject within the radiation detector and the radiation beam.
Rotating means for rotating and the test object obtained by the radiation detector
Disconnection of the subject based on transmission data from multiple directions of the body
And a reconstruction means for creating a plane image.
In the computer tomography apparatus, the rotating means is
A table on which a sample is placed and the table is rotated
The rotating mechanism is disposed between the table and the non-rotating portion.
With a slip ring mechanism that is fixed to the table,
The pressurizing unit that changes the pressure inside the subject and the slip
Electric power is sent to the pressurizing unit through a pulling mechanism to perform the test.
And a control unit for controlling the state of pressure inside the body.
It is characterized by Therefore, the computer of the invention of claim 4
In a computer tomography apparatus, a table and a non-rotating part
Through a slip ring mechanism installed between
Sending electric power to control the state of pressure inside the subject
Allows the internal pressure to be increased while the subject remains on the table.
You can change the quality of the image, and
It will contribute to the adaptation.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing an example of a computer tomography apparatus according to the present embodiment. FIG. 1 (a) is its front sectional view and FIG. 1 (b) is the same. It is an AA partial arrow line view.

In FIG. 1, a computer tomography apparatus is a radiation source X that generates a cone-shaped X-ray beam.
The X-ray tube 1 and the planar solid X-ray detector 5 which is a radiation detector for detecting the cone-shaped X-ray beam 2 generated from the X-ray tube 1 with two-dimensional resolution, and X-rays along the imaging tomographic plane 6. A table mechanism 7 that is a rotating unit that rotates the subject 4 within the beam 2 and changes the imaging surface, and a mechanism control unit 2
6, a data processing unit 24 that is a reconstructing unit that processes X-ray transmission data output as digital data from the planar solid-state X-ray detector 5, and a display unit 25 that displays a processing result by the data processing unit 24. It consists of.

The table mechanism 7 includes a horizontal table 3 on which the subject 4 is placed, a vertical spline shaft member 8 fixed to the table 3, and the spline shaft member 8 via the ball 22 only in the direction of the spline shaft 28. A spline bearing 9 that movably holds the rotating frame 10, a rotating frame 10 to which the spline bearing 9 is fixed, and a rotating frame 10 that holds the rotating frame 10.
8, a frame 15 and a bearing 14 that rotatably hold the rotating shaft 27, a worm wheel 11 fixed to the rotating frame 10 that rotates the rotating frame 10 together with the table 3 and the spline shaft member 8, and a frame 15. Supported by the worm gear 12, a motor 13 for rotating the worm gear 12, a vertical movement frame 17 supporting the lower end of the spline shaft member 8 via a thrust bearing 16, and a vertical movement frame 17 movably supported in the vertical direction. Rail 18, a ball nut 20 fixed to the vertical movement frame 17 for vertically moving the vertical movement frame 17 together with the table 3 and the spline shaft member 8, a ball screw 19 supported by the frame 15, and a ball screw 19 rotated. And a motor 21 for driving.

The data processing unit 24 is composed of an ordinary computer, and has an interface, memory, disk,
Equipped with a keyboard.

The data processing unit 24 is composed of a data preprocessing unit, a reconstruction unit, and the like, and also stores a program for the entire scan. The operator can set parameters here,
Menu selection, scan start, device status reading, cross-sectional image display, cross-sectional image analysis, etc.

Next, the operation of the computer tomography apparatus of the present embodiment having the above-mentioned configuration will be described.

In FIG. 1, first, the operator is the subject 4
Is placed on the table 3, and the target tomographic plane position is aligned with the imaging tomographic plane 6 by vertical movement. This can also be performed by displaying a transmission image on the display unit 25.

When X-rays are turned on and scanning is started, data collection is performed while rotating 360 degrees. At each position of rotation, the X-ray transmission image is converted into digital data by the flat solid-state X-ray detector 5 and sent to the data processing unit 24, and the cross-sectional image of this plane is reconstructed from the transmission data of the tomographic plane 6. It

The target slice plane of the subject 4 is changed by the motor 2
In step 1, the ball screw 19 is rotated to move the vertically moving frame 17 up and down, and the spline shaft member 8 connected to this by the thrust bearing 16 is vertically moved.

The vertical movement frame 17 is connected to the spline shaft member 8 in the vertical movement direction without any play, but has a slight slip in the horizontal direction so that it is provided between the rail 18 and the spline shaft 28. Even if there is some misalignment, the distortion when moving up and down can be released.

The rotation of the subject 4 causes the motor 13, the worm gear 12, and the worm wheel 11 to rotate the rotating frame 10, and the spline shaft member 8 connected to the rotating frame 10 by the spline bearing 9 in the rotating direction without rattling. It is done by

Since the rotary frame 10 is always supported by the frame 15 by the bearings 14 regardless of the vertical movement position, the center of rotation C, which is the intersection of the rotary shaft 27 and the imaging tomographic plane 6, is displaced by the vertical movement. It is unchanged.

The rotating frame 10 can be temporarily machined on both the inner and outer circumferences by a lathe, so that the rotating shaft 27 and the spline shaft 2 are
Since 8 coincides with high precision, the runout of the spline shaft member 8 when rotated is very small.

Even if there is a shake, since a horizontal slide is provided at the connecting portion with the vertical moving frame 17, it is possible to release the strain when rotating.

Even if the rotating shaft 27 and the spline shaft 28 do not coincide with each other, the center of rotation C is basically unchanged regardless of the vertical movement as shown in FIG.

As described above, in the computer tomography apparatus of this embodiment, even if the target tomographic plane position is changed,
It is possible to reconstruct a high-quality cross-sectional image without changing the rotation center C.

(Modification 1) The computer tomography apparatus according to the first embodiment is of the so-called RR type, but may be of the TR type.

That is, it becomes possible by adding a mechanism for translating the entire table mechanism 7 in the horizontal direction and combining the step rotation and the translation operation.

Also in this case, the center of rotation C does not change even if the target tomographic plane position is changed, and a high-quality cross-sectional image can be reconstructed.

(Modification 2) The point of the first embodiment is that the rotating frame 10
This is a point in which a member that swings only substantially in the direction of the rotation axis is provided on the top of which the table 3 is fixed. In FIG. 1, spur gears or belts and pulleys may be used for rotation without using the worm gear 12. However, it may be a direct drive motor without gears.

Further, the spline shaft member 8 and the spline bearing 9 may be rails and rail receivers, or the number of shaft members need not be one.

Further, the rail 18 may be omitted for vertical movement, and the ball screw 19 may be a normal screw, or a rack and a pinion may be used.

(Modification 3) FIG. 3 is a front sectional view showing a modification of the first embodiment. The same parts as those in FIG. Now, only different parts will be described.

That is, in this example, the motor 29 is supported by the vertical moving frame 17 and the spline shaft member 8 is directly rotated.

This makes it possible to change the position of the rotary motor.

(Second Embodiment) FIG. 4 is a front sectional view showing a configuration example of a computer tomography apparatus according to the present embodiment. The same parts as those in FIG. Is omitted and only different parts will be described here.

That is, as shown in FIG. 4, the computer tomography apparatus according to the present embodiment has a table 3 shown in FIG.
A tilting mechanism 40 including a tilting table 41 and a tilting drive section 42 for mounting the subject 4 fixed on the table 4, a slip ring 45 connected to the lower end of the spline shaft member 8, a cable bear 46, and a tilting through the slip ring 45. Inclination control unit 4 that sends electric power to the mechanism 40 to control the mounting angle of the subject 4
7, a wiring hole 44 provided in the table 3 and the spline shaft member 8, and a wiring 43 between the tilt drive unit 42 and the slip ring 45 and between the slip ring 45 and the tilt control unit 47. There is.

The slip ring 45 is composed of a rotary shaft, a fixed casing, and a plurality of sets of rings and brushes for electrically connecting the rotary shaft side terminal to the fixed side terminal. The rotary shaft is coaxial with the spline shaft member 8. It is fixed, and the fixed-side housing is fixed to the vertically movable frame 17.

Next, the operation of the computer tomography apparatus of the present embodiment having the above-mentioned configuration will be described.

In FIG. 4, first, the operator is the subject 4
Is placed on the tilt table 41, the tilt control unit 47 is operated, and the target tomographic plane position is adjusted to the imaging tomographic plane 6 by vertical movement. This can also be performed by displaying a perspective image on the display unit 25.

The subsequent operation is the same as in the case of the first embodiment, and a sectional image is taken.

As described above, in the computer tomography apparatus of this embodiment, the target tomographic plane of the subject 4 can be easily tilted.

Further, since the slip ring 45 is used, the subject 4 can be continuously rotated in one direction many times, and it becomes possible to efficiently photograph a plurality of cross sections.

(Modification 1) FIG. 5 is a schematic view showing a modification of the second embodiment, in which the same parts as those in FIG. 4 are designated by the same reference numerals and the description thereof is omitted. Only different parts will be described.

That is, in this example, the tilting mechanism 40 and the tilting control section 47 in FIG. 4 are omitted, and instead of these, a chucking mechanism 50 as a mounting / demounting section and a mounting / demounting control section 55 are provided.

In the chucking mechanism 50, the movable claw 5 is moved by the motor 54 via the screw 52 supported by the bearing 53.
1 is moved to sandwich and fix the subject 4.

The attachment / detachment control section 55 sends electric power or a signal to the chucking mechanism 50 through the slip ring 45 to control attachment / detachment of the subject 4.

Although the two movable claws 51 are moved in the opposite directions in FIG. 5, they can be moved radially like a lathe.

In the case of the magnetic object 4 to be examined, an electromagnet can be used.

As a result, the objects 4 can be easily attached and detached, and a large number of objects 4 can be inspected efficiently.

(Modification 2) As another modification of the second embodiment, the tilting mechanism 40 and the tilt controller 47 are omitted, and instead of these, a heater for changing the temperature of the subject 4 is used. The temperature control unit may be provided.

This makes it possible to easily change the temperature state of the subject 4 and obtain a cross-sectional image.

(Modification 3) As another modification of the second embodiment, the tilting mechanism 40 and the tilting controller 47 are omitted, and instead of these, the pressure inside the subject 4 is changed. A pressurizer and a pressure control unit that controls the pressurizer may be provided.

Further, an electromagnetic field changing unit and an electromagnetic field control unit for changing an electric field or a magnetic field inside the subject 4 and an arrangement changing unit for changing the internal arrangement of the subject 4 and its control unit may be provided.

Furthermore, when the subject 4 itself has a means for changing its state, the subject 4 can be easily provided by providing a subject control section for sending a signal for changing the power or the internal state.
It is possible to obtain a cross-sectional image in the operating state of, or while changing the state.

(Third Embodiment) FIG. 6 is a front view showing a configuration example of a computer tomography apparatus according to the present embodiment. The same parts as those in FIG. It is omitted and only different parts will be described here.

That is, as shown in FIG. 6, the computer tomography apparatus according to the present embodiment has a common configuration in FIG. 1, namely, the X-ray tube 1, the planar solid X-ray detector 5, the table mechanism 7, and the mechanism control. In addition to the unit 26, the data processing unit 24, and the display unit 25, a shift mechanism 60 that moves the table mechanism 7 toward the X-ray focal point F to change the imaging distance,
A slit mechanism 61 that limits the X-ray beam 2, a slit retracting mechanism 62 that retracts the slit mechanism 61, a slit control unit 72 that controls the slit mechanism 61 and the slit retracting mechanism 62, and a filter mechanism that switches the X-ray filter 70. 67, a filter retracting mechanism 68 that retracts the filter mechanism 67, and a filter control unit 73 that controls the filter mechanism 67 and the filter retracting mechanism 68.

The slit mechanism 61 includes two shield plates 64.
Screws 65a and 65b for moving a and 64b up and down respectively
And the motors 66a and 66b to change the width of the slit 63 around the tomographic plane 6.

The slit retracting mechanism 62 retracts the entire slit mechanism 61 so that the subject 4 and the table mechanism 7 do not interfere with each other when the photographing magnification is increased.

The filter mechanism 67 includes several types of filters 70.
The filter holder 69 to which a, 70b, ... Are fixed is rotated by a motor 71 and switched.

Note that one of these filters is X
It uses a line shielding material and can be used as an X-ray shutter.

The filter retracting mechanism 68 retracts the entire filter mechanism 67 so that the subject 7 and the table mechanism 7 do not interfere with each other when the photographing magnification is increased.

The slit control section 72 and the filter control section 73 are connected to the data processing section 24 via the mechanism control section 26, and perform control in accordance with commands from the data processing section 24 according to the operator's menu selection. It is a thing.

Next, the operation of the computer tomography apparatus of the present embodiment having the above-mentioned configuration will be described.

In FIG. 6, a cross-sectional image is photographed in the same manner as in the case of the first embodiment, but in the case of the third embodiment, it depends on the type of the subject 4 and the examination contents. You can change the shooting method.

First, as a normal use, when the filter mechanism 67 and the slit mechanism 61 are retracted, the subject 4 can be brought close to the X-ray focal point F of the X-ray tube 1 to the utmost, and the tomography is performed at high magnification. Alternatively, a transmission image can be taken.

Next, X of pharmaceuticals, chemical substances, photosensitive substances, etc.
In the case of the subject 4 whose radiation exposure is desired to be reduced as much as possible, the filter mechanism 67 and the slit mechanism 61 are arranged so as to be set.

As the filter, a filter suitable for the voltage of the X-ray tube 1 is selected, and the soft X-rays which greatly contribute to the exposure are cut.
Then, the slit 63 is fully opened only when the target tomographic plane is set, and the slit 63 is narrowed to the minimum when the tomographic imaging is performed, whereby the X-ray exposure of the subject 4 can be minimized.

On the other hand, in the case of the subject 4 mainly composed of a low-element substance such as plastic, the scattered X-ray component from the subject 4 is large and the image may be deteriorated.

In this case, the slit mechanism 61 is set as a set. Then, when the tomography is performed, the slit 63
By narrowing down to a minimum, scattered rays from the subject 4 can be reduced and the cross-sectional image can be made high quality.

At this time, the filter mechanism 67 may be arranged as set.

Further, it is preferable that the filter mechanism 67 is set because the filter cuts the soft X-rays and the image inhomogeneity due to the ray hardening phenomenon is improved.

Next, the X-ray tube 1 needs to be gradually warmed up from the low tube voltage to the high tube voltage when the rest time exceeds a certain time. At this time, the filter mechanism 67 is set and arranged. An X-ray shielding material is selected as a filter so as to block X-rays.

By doing so, it is not necessary to apply useless X-rays to the flat solid-state X-ray detector 5 (similarly for other detector types), and the useful life is increased.

As described above, the computer tomography apparatus according to this embodiment can contribute to the improvement of image quality and the variety of imaging.

(Modification) In the third embodiment, the slit mechanism 61 is
The two shield plates 64 may be moved in opposite directions by one motor, or may be moved by a cam instead of the screw 65.

Further, the filter holder 69 may be moved by sliding instead of rotating.

Furthermore, the arrangement of the slit mechanism 61 and the filter mechanism 67 may be reversed, and they may be integrated.

Further, the shielding plate 64 fixed without the screws 65 and the motor 66 is used as the slit retracting mechanism 62.
The slit 63 may be fully opened by retracting at.

Furthermore, the planar solid-state X-ray detector 5 has a
It may be a combination of a three-dimensional X-ray detector, for example, an X-ray II and a television camera.

(Fourth Embodiment) FIG. 7 is a front view showing a configuration example of a computer tomography apparatus according to the present embodiment. The same parts as those in FIG. It is omitted and only different parts will be described here.

That is, as shown in FIG. 7, the computer tomography apparatus according to this embodiment has the same configuration as that shown in FIG. 1, namely, the X-ray tube 1, the planar solid X-ray detector 5, the table mechanism 7, and the mechanism control. In addition to the section 26, the data processing section 24, and the display section 25, a visual field range generator 80 is provided.

The visual field range generator 80 includes a data processing section 24.
Based on the output signal from the line solid line X-ray detector 5, the line number n1, which indicates the visual field range transferred to the data processing unit 24,
n2 is generated and given to the planar solid-state X-ray detector 5.

FIG. 8 is a diagram showing an example of a field of view of an X-ray transmission image detected by the flat solid-state X-ray detector 5.

In FIG. 8, 84 is a slice line, 85 is the entire field of view, and 86 is the field of view during tomography.

FIG. 9 is a schematic diagram showing an example of the internal structure of the planar solid X-ray detector 5.

In FIG. 9, 3 × is used for the sake of simplicity of explanation.
It is drawn in 3 matrices, but it is actually 1000x
It is about 1000.

In FIG. 9, the planar solid X-ray detector 5 is
A scintillator (not shown) is adhered on the matrix of the photodiode D, and the light emitted from the scintillator when hit by X-rays is stored as a difference in charge of a capacitor C connected in parallel to the photodiode D, and is sequentially arranged vertically and horizontally. The data is read out and converted into digital data by the AD converter 81.

Switching in the horizontal direction is performed by sequentially turning on the transistor T in the shift register 82, and switching in the vertical direction is performed by converting the output from the integrator U for each row into a time series by the multiplexer 83. .

The multiplexer 83 is used for the visual field range generator 8
N2 from the n1th row according to the signals n1 and n2 from 0.
Convert up to the line to time series.

As a result, the X-ray transmission data of the visual fields of the row numbers n1 and n2 are sent to the data processing section 24.

Next, the operation of the computer tomography apparatus of the present embodiment configured as described above will be described.

In FIG. 7, a cross-sectional image is photographed in the same manner as in the case of the first embodiment, but in the case of the fourth embodiment, referring to FIG. In the case of radiography, 1 and N are generated as n1 and n2 from the visual field range generator 80, so that X-ray transmission data of the entire visual field can be obtained.

On the other hand, in the case of tomography, n1 and n2 are generated such that the narrow range including the slice line corresponding to the tomographic plane 6 becomes the field of view 86 during tomography.

As described above, in the computer tomography apparatus of the present embodiment, data can be collected without waste according to the slice width of the subject 4, so the scan time can be shortened and the subject 4 can be scanned. X-ray exposure can also be reduced.

(Modification) In the fourth embodiment, the planar solid-state X-ray detector 5 of FIG. 9 may be used with its length and width reversed.
In this case, the output signal n1, from the flat solid-state X-ray detector 5
n2 is input to the shift register 82 and limits its operating range.

The field-of-view range generator 80 uses n1, n2
At the same time, m1 and m2 that limit the lateral visual field may be generated. In this case, the output signals m1 and m2 from the visual field range generator 80 are input to the shift register 82 to limit its operating range. This makes it possible to collect data more efficiently when the subject 4 does not occupy the entire field of view.

Furthermore, in the fourth embodiment,
The detector does not necessarily have to be the planar solid-state X-ray detector 5, but may be another two-dimensional X-ray detector, such as X-ray II and a television camera.

[0106]

As described above, according to the computer tomography apparatus of the present invention, it is possible to contribute to the improvement of image quality and the diversification of imaging.

[Brief description of drawings]

FIG. 1 is a first computer tomography apparatus according to the present invention.
3 is a front sectional view and an AA partial arrow view showing the embodiment of FIG.

FIG. 2 is a diagram showing an invariant state of a rotation center C in the computer tomography apparatus according to the first embodiment.

FIG. 3 is a front sectional view showing a modified example of a motor position in the computer tomography apparatus according to the first embodiment.

FIG. 4 is a second computer tomography apparatus according to the present invention
FIG. 3 is a front sectional view showing the embodiment of FIG.

FIG. 5 is a schematic view showing a modified example of the computer tomography apparatus according to the second embodiment.

FIG. 6 is a third of the computer tomography apparatus according to the present invention.
The front view which shows the embodiment of FIG.

FIG. 7: Fourth computer tomography apparatus according to the present invention
The front view which shows the embodiment of FIG.

FIG. 8 is a diagram showing an example of a field of view of an X-ray transmission image detected by a planar solid-state X-ray detector in the computer tomography apparatus according to the fourth embodiment.

FIG. 9 is a schematic diagram showing an internal configuration example of a planar solid-state X-ray detector in the computer tomography apparatus according to the fourth embodiment.

FIG. 10 is a schematic diagram showing a configuration example of a conventional typical RR type computer tomography apparatus.

[Explanation of symbols]

1 ... X-ray tube 2 ... X-ray beam 3 ... table 4 ... Subject 5 ... Planar solid-state X-ray detector 6 ... Imaging plane 7 ... Table mechanism 8 ... Spline shaft member 9 ... Spline bearing 10 ... Rotating frame 11 ... Worm wheel 12 ... Worm gear 13 ... Motor 14 ... Bearing 15 ... Frame 16 ... Thrust bearing 17 ... Vertical movement frame 18 ... Rail 19 ... Ball screw 20 ... Ball nut 21 ... Motor 22 ... Ball 24 ... Data processing unit 25 ... Display 26 ... Mechanism control unit 27 ... Rotary axis 28 ... Spline shaft 29 ... Motor C ... Center of rotation 40 ... Tilt mechanism 41 ... Inclined table 42 ... Tilt drive unit 43 ... Wiring 44 ... Wiring hole 45 ... slip ring 46 ... Cable bear 47 ... Tilt controller 50 ... Chucking mechanism 51 ... Movable claw 52 ... screw 53 ... Bearing 54 ... Motor 55 ... Attachment / detachment control unit 60 ... Shift mechanism 61 ... Slit mechanism 62 ... Slit retracting mechanism 63 ... slit 64 ... Shielding plate 65 ... screw 66 ... Motor 67 ... Filter mechanism 68 ... Filter withdrawal mechanism 69 ... Filter holder 70 ... Filter 71 ... Motor 72 ... Slit control unit 73 ... Filter control unit F ... X-ray focus 80 ... Field-of-view range generator 81 ... AD converter 82 ... Shift register 83 ... Multiplexer T ... transistor D ... Photodiode C ... Capacitor U ... integrator E ... Power 84 ... Slice line 85 ... Full view 86 ... Field of view during tomography.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Fujii 1-24-2, Harumi-cho, Fuchu-shi, Tokyo Within Toshiba FA System Engineering Co., Ltd. (72) Inventor Kiichiro Uyama 2--24, Harumi-cho, Fuchu-shi, Tokyo 1 Toshiba Toshiba System Engineering Co., Ltd. (56) Reference JP-A-2-224746 (JP, A) JP-A-63-68139 (JP, A) JP-A-62-101383 (JP, A) JP-A-SHO 61-98238 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01N 23/04

Claims (4)

(57) [Claims] 1. A radiation source for generating a radiation beam, a radiation detector for detecting the radiation beam from the radiation source with a spatial resolution, rotating means for rotating an object in the radiation beam, and the radiation detector. In a computer tomography apparatus configured with a reconstructing unit that creates a cross-sectional image of the subject based on transmission data from multiple directions of the subject obtained by, the rotating unit, a table for placing a rotating mechanism for rotating the table, Ru is disposed between the table and the non-rotating portion Surippuri
It is fixed to the table and the table, and the mounting angle of the subject is changed.
Power to the tilt mechanism through the slip ring mechanism and the slip ring mechanism.
A computerized tomography apparatus, comprising: a tilt control unit that controls the mounting angle of the subject . 2. A radiation source for generating a radiation beam, and
The radiation beam from the radiation source is detected with spatial resolution.
The radiation detector that emits light and the subject within the radiation beam
Obtained by the rotating means and the radiation detector
Based on transmission data from multiple directions of the subject,
And a reconstruction means for creating a sectional image of the body.
In the computer tomography apparatus, the rotating means includes a table on which the subject is placed, a rotating mechanism for rotating the table, and a slip mechanism arranged between the table and the non-rotating portion.
And a detaching unit fixed to the table for attaching and detaching the subject.
And sending power to the attachment / detachment unit through the slip ring mechanism.
An attachment / detachment control unit for controlling attachment / detachment of the subject , the computer tomography apparatus. 3. A radiation source for generating a radiation beam, and
The radiation beam from the radiation source is detected with spatial resolution.
The radiation detector that emits light and the subject within the radiation beam
Obtained by the rotating means and the radiation detector
Based on transmission data from multiple directions of the subject,
And a reconstruction means for creating a sectional image of the body.
In the computer tomography apparatus, the rotating means includes a table on which the subject is placed, a rotating mechanism for rotating the table, and a slip mechanism arranged between the table and the non-rotating portion.
Fixed to the table and a mechanism for changing the temperature of the subject.
A heat unit, sending power to the heating unit through the slip ring mechanism
And a control unit for controlling the temperature condition of the subject . 4. A radiation source for generating a radiation beam, and
The radiation beam from the radiation source is detected with spatial resolution.
The radiation detector that emits light and the subject within the radiation beam
Obtained by the rotating means and the radiation detector
Based on transmission data from multiple directions of the subject,
And a reconstruction means for creating a sectional image of the body.
In the computer tomography apparatus, the rotating means includes a table on which the subject is placed, a rotating mechanism for rotating the table, and a slip mechanism arranged between the table and the non-rotating portion.
Is fixed to the table and the table to change the pressure inside the subject.
And further to pressing, feeding power to the pressing through the slip ring mechanism
A computer tomography apparatus, comprising: a control unit that controls a state of pressure inside the subject .