JPS5883938A - X-ray ct apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention belongs to the field of medical equipment for diagnosis and relates to an X-ray CT apparatus. For more details, see
X1 prevents twisting of the high voltage cable attached to the X-ray tube when the tube is continuously rotated around the subject.
Regarding CT equipment.

(2) Prior Art Conventionally, an X-ray CT apparatus, for example, as shown in FIG.
As shown in the figure, there is an X-ray tube 1 mounted on a rotating mount, a detector array 2 for detecting the amount of X-rays emitted from the X-ray tube 1, and processing of data detected by the detector array 2. a data processing device 3 that reconstructs an image and controls the operation of each part of the device;
It is equipped with at least a power supply device 4 that supplies a high voltage to a wire tube 1 and an image display device 5 that displays an image reconstructed by a data processing device 3. The X-ray tube 1 is rotated while exposing xm to the X-ray tube 1, and the amount of X-ray transmission is detected by the detector array 2 facing the X-ray tube 1. Based on the obtained data, the data processing device 3, the image is reconstructed, and a tomographic image of the subject 6 is displayed on the image display device 5 for diagnosis.

(3) Problems with the prior art However, in the conventional X-ray CT apparatus, the X-ray tube 1 is fixed to a rotating stand (not shown), and the
Since the X-ray irradiation port 1α of the X-ray tube 1 is directed toward the subject 6, when the rotating mount is rotated, the high voltage supply cable attached to the X-ray tube 1 is twisted. Therefore, since it is of course impossible to rotate the rotating mount in the same direction many times in succession, it is necessary to rotate the rotating mount on which the X-ray tube 1 is mounted many times for each tomographic plane of the subject 6. In order to scan with
b) The transfer table must be rotated. Then,
In order to perform a reversal in the N-direction, the rotation of the heavy rotating pedestal must be temporarily stopped, and the rotating pedestal must be started again after it has been stopped, so scanning with the X-ray tube 1 takes a long time. In the end, conventional X-ray C
With the T device, it was not possible to perform continuous + a-scanning at high speed.

(4) Purpose of the Invention The object of the present invention is to rotate the rotary mount while maintaining the X-ray tube mounted on the rotary mount in the same position, and to use an electron beam scanner to capture the object from the X-ray tube. To provide an X-ray CT device capable of performing continuous rotation scanning at high speed without causing twist γL in a high voltage cable attached to an X-ray tube by irradiating X-rays to the X-ray tube. (5) Structure of the Invention The gist of the present invention is to provide an X-ray CT apparatus that includes at least a scanner body that irradiates a subject with X-rays from an X-ray tube that rotates around the subject and obtains Xaa excess data. In, X
X-rays can be transmitted from the X-ray tube to the subject by means of rotating the ray tube around the subject without rotating it, and by moving the X-ray focal point in synchronization with the movement of the X-ray tube. The X-ray tube is equipped with a means for irradiating radiation, and a cable connecting the X-ray tube and a power supply device that supplies power to the X-ray tube. X1 is characterized in that it also enables continuous rotational scanning.
This is a CT device.

(6) Embodiments of the invention Examples of the invention will be described with reference to the drawings.

FIG. 2 is a full cross-sectional perspective view schematically showing the scanner body of the X-ray CT system #L which is an embodiment of the present invention.

In FIG. 2, the reference numeral 10 indicates a base frame, which installs and fixes the scanner body on the floor, and also serves as a rotating frame (hereinafter also referred to as a rotation frame) 11.
This supports the paddle so that it can rotate smoothly two times within the base frame 10. That is, the pace frame 10 is the (b) of the rotation frame 11.
It has a built-in drive source (not shown) that enables rotation 9, and a cylindrical frame housing part 10α having a horizontal central axis, and includes appropriate gears and rotation frames (not shown) that transmit the power of the drive source. The rotation frame 11 is rotatably supported within the frame storage portion 10α by meshing with a rotation frame gear 11α provided on the outer peripheral surface of the rotation frame 11. Further, a guide gear 10h, which is a ninth latch gear for controlling the attitude of the X-ray Haube 12, which will be described in detail later, is provided on the cylindrical inner circumferential surface of the gantry housing portion 10α. Haube 12 #) @Detector array 10C consisting of a large number of detection elements that detect the emitted X-rays
is placed.

The rotation frame 11 has a disk shape as shown in FIG. 2, and includes at least an imaging hole 11b, a decelerator 11C, and an X-ray Haupe storage section 11d. The imaging hole 11A is opened at the center of the rotation frame 11 and is pulled out from the treatment bed (not shown).
A subject, for example, a patient 16, lying on a top plate (not shown) can be inserted and placed therein, and the rotation frame 11 does not come into contact with the patient 13 even when the rotation frame 111 is rotated. Decelerator 1
1c is a guide gear 1 provided on the pace frame 10.
Haube gear 12α installed in 0A and X-ray Haube 12
Together with this, it constitutes means for maintaining the same attitude of the Xm Haube 12. The speed reducer 11C is a guide gear 1.
The input key 711g meshes with 0A, the output gear 117 meshes with the Haube gear 12α, and the input key 7 as necessary.
11g and the output gear 11f - or a plurality of intermediate gears (not shown). As a result, the gear ratios of the guide gear 10b1, the Ube gear 12α, and each gear 1 in the reducer 11C are adjusted so that the X-ray Haube 12 maintains the same posture without rotating. The X-ray Haube storage section 11d has an X-ray Haube insertion hole 111 with an opening 7, and an X-ray Haube insertion hole 111 that allows the X-ray Haube 12 to be loosely fitted from one vertical surface of the rotation frame 11 to another vertical surface. This completely prevents the X&IJ emitted from the X-ray irradiation port 12b of the XIR Haube 12 loosely fitted into the Ube insertion hole 11q from leaking to areas other than the designated areas, and also prevents X-rays from leaking to the patient 1 while the rotation frame 11 is rotating.
6 and has an X-ray slit 11A that opens so as to reach the detector array 1DC.

Next, for the Xm Haube 12, which has a built-in X-ray tube,
The explanation will be made with reference to FIGS. 3 and 4 in addition to the drawings.

Figure 3 is a vertical cross-sectional view schematically showing the X-ray Haupe 12.
1. FIG. 4 is a schematic sectional view taken along the line A-A' in FIG. 3.

As shown in FIG. 6, the X-ray Haupe 12 has a substantially cylindrical shape, and a Haupe gear 1 that meshes with the output gear 11f of the reducer 11C as described above is provided on the outer periphery of one end surface.
For example, three cable guide pipes 12C, 12d, and 12e are attached to one end surface of the cable guide pipe 2α.
Bellows type flexible joint 12f as shown in the figure
controller 4α (movement of the X-ray tube 14 and
l1! (including a high voltage power supply 1114) and an xa tube controller that synchronizes the movement of the focus position. At the other end of the X-ray Haupe 12, there is a cooling oil 12 filled in the X-ray Haupe 12! The X-ray Haube 12 is equipped with an oil cooler 12A for cooling the X-ray tube 14, the cable guide pipe 12. an anode cable 14α that is inserted through the inside and connected to the anode of the X-ray tube 14; a cathode cable 14b that is inserted through the inside of the cable guide pipe 12 and connected to the cathode of the X-ray tube 14; The rotor cable 14C is inserted through the cable guide vibe 12C and pulled out into the X-ray Haube 12, and the rotor 14d connected to the rotor cable 14C is removed in order to rotate the rotating anode in the X-ray tube 12. n is placed, and cooling oil 12 is placed in the gap between them! I am filled n. Further, as shown in FIG. 4, an X-ray irradiation hole 12b is provided in the circumferential side of the intermediate portion of the X-ray Haube 12, leaving the Haube body 121 in the vicinity of the cathode cable 14h. Note that the opening angle of the X-ray irradiation hole 12h is preferably at least π+290. Here, ψ0 is the fan angle of the fan-shaped X-ray beam emitted from the X-ray tube. X-ray irradiation hole 12
If the aperture angle of h is set as described above, the
Even if the patient 13 maintains the same posture, the X-ray Haube 12 can emit X-rays toward the patient 13. However, depending on the position of the hauppe body 121 of the rotating X-ray haupe 12, there are times when the patient 13 is not irradiated with X-rays. By using the X-ray transmission data irradiated by the X-ray tube, a tomographic image can be suitably reconstructed.

Next, the X-ray tube 14 will be explained with reference to FIG. 5.

FIG. 5 is a cross-sectional view schematically showing the X-ray tube 14. As shown in FIG.

As shown in FIG. 5, the X-ray tube 14 generates X-rays using an electron beam scanning method.
5 A cathode connector 14f is attached to one end of the tube body 14g, and a cylindrical anode connector 14y is attached to the other end.In the SX-ray tube body 14g, a cathode filament No. 14 and a deflection coil are connected to the cathode connector 14f via a conductor 14A. 1st season, 14th and 14th aperture! are arranged in sequence, and inside the X-ray tube body 11, an anode connector 14! A rotating anode 14FL in the shape of a truncated cone is connected to the X-ray tube body 14# and is rotated by the rotor 14d shown in FIG. From the conical surface of the anode 14rL 5X-ray tube 1
4 outward in a direction VcXm perpendicular to the central axis of the X-ray tube 14
An X-ray irradiation port 14# is provided so that X-rays can be emitted. Then, the thermoelectrons emitted from the cathode filament 14i are focused into a stain beam by the diaphragm 14g, and the electron beam is deflected by the deflection coils 1 and 14 in synchronization with the rotational position of the X-ray tube 14 relative to the patient 16. and rotating anode 1
4. The X-rays generated on the conical surface of the rotating anode 14 are focused on the conical surface of the rotating anode 14, and the
The radiation is emitted from the ray irradiation port 140. Note that the rotating anode 14rL is rotated by the rotor 14dK during the generation of X-rays.
As mentioned above, the electron beam is deflected in synchronization with the rotational position of the X-ray tube 14 by the deflection coils 14) and 14k. The focus is set on the conical surface of the rotating anode 14, and this focus moves sequentially as the X-ray focal point, so no matter what rotational position the X-ray tube 14 is in with respect to the patient 13, the X-ray X spreads out in a fan shape from the radiation tube 14 to the patient 16
rays can be irradiated.

Note that the Xm tube 14 is manufactured by, for example, Japanese Patent Publication No. 52-6489.
The nfcXm tube described in Publication No. 4 can be used.
Based on the X-ray transmission data obtained from the scanner body, the first
In the same way as in the conventional X-ray CT device shown in the figure,
Since a line tomographic image is reconstructed and displayed, a detailed explanation of the device valleys other than the scanner body will be omitted.

Next, the operation of the X-ray CT apparatus constructed as described above, particularly the scanner body, will be explained with reference to FIG. 6.

FIG. 6 is an explanatory diagram showing the movement of the X-ray Haube 12.

First, in FIG. 2, power from a drive source (not shown) in the base frame 10 is transmitted to the rotation frame 11 via a rotation frame gear 11α meshing with a gear (not shown). Rotate along the direction of the arrow inside. Since the X-ray Haube 12 is stored in the X-ray Haube storage section 11d of the rotation frame 11, the rotation frame 1
Xm Haube 12 around the patient 13 located in the imaging hole 11A of the rotation frame 11
will also rotate along the direction of the arrow in FIG. At this time, the guide gear 10A,
Since the gear ratios of the gears in the gear 12α and the speed reducer 11C are adjusted, the X-ray Haupe 12 can make one rotation around the patient 13 without rotating. Therefore, as shown in FIG. The cable guide pipes 12C and 12g (12d is omitted for simplicity of drawing) attached to the wire Haube 12 are connected to the X-ray Haube without twisting by using the flexible joint 12f as a node. This will follow the rotation of 12. Therefore, the X-ray Haube 12 continuously
No matter how many times it rotates around the cable guide pipe 12C
, 12d, and 12g, the anode cable 14a, cathode cable 14A, and rotor cable 14C are never twisted.

On the other hand, in the X-ray tube 14, the deflection coil 1
The electron beam is deflected by 4c14&n.

Xa generated when the rotating anode 14n is irradiated with the deflected electron beam is transmitted to the X-ray irradiation port 140 of the Xm tube 14.
．． , the Xm irradiation port 12h of the X-ray Haube 12 and the X-ray slit)
X-ray irradiation port 14 of ray tube 14 (1,
The radiation irradiation port 12b and the X-ray slit 11A are
In order to obtain sufficient X-ray transmission data to reconstruct a tomographic image of In synchronization with the rotational position of the X-ray Haube 12 with respect to the patient 13, the electron beam is deflected by the deflection coil 14j within the X-ray tube 14 so that the patient 13 is irradiated with X-rays from the X-ray tube 14 in a fan shape. , 14k, and as shown in FIG. Furthermore, as shown in FIG. 7, when the Xa Haube 12 rotates around the patient 13, there is a position where the X-ray Haube 12 does not irradiate the patient 13 with X-rays. X-ray transmission data at position is X#
Since the X-ray transmission data obtained when the Haube 12 is in another position is substituted and reused, there is no problem in reconstructing the tomographic image of the patient 13.

After passing through the body of the patient 13, the Xa irradiated to the patient 13 reaches the detector array 10CVc, and the Xa is detected by the detector.
The Xm transmission data of which the line intensity was detected is transferred to the data processing device 13, as shown in FIG. It is displayed on the display device 5.

As detailed above, according to the embodiment, the X-ray Haube 1
13 without twisting the various cables that connect to 2.
The X-ray Haupe 12 can be continuously rotated many times around the .

(Modifications of the Invention This invention is not limited to the above embodiments, but can be implemented with various modifications within the scope of the gist of the invention.

In the above embodiment, the X-ray tube 14 has a rotating truncated cone-shaped rotary anode 14n with a conical side surface synchronously with the position of the X-ray tube 14 rotating around the patient 16. Irradiating the deflection coils 14j and 14 with the electron beam deflected by the
It generated X-rays that were irradiated to patient 13,
As a modified example, the X-ray tube 14 shown in FIGS. 8 and 9 may be used. The place to do this is the deflection coil 14js14
Instead of using J, the electron beam generated from cathode filament 14L and focused by diaphragm 14g is used as (b) Using the rotary anode 14n, the rotary anode 14p, which rotates in synchronization with the position of the Xm tube 14 relative to the patient 1'5, is used for the tube 9; X-rays generated by the electron beam are transmitted to the X-ray tube 110. The patient 16 can be irradiated regardless of its position. Since the X-ray tube 14 having the structure shown in FIG. 8 does not include a deflection coil, the X-ray tube 14 can be quantized.

The X-ray tube 14 shown in FIG. 9 differs from the X-ray tube 14 in the previous embodiment in that the deflection coil 14j,
14k using rotating anode 14. Instead of irradiating the electron beam onto the conical side surface of n, it is connected to the cathode cable 14A via a slip ring 14.7, and the X-ray tube body 1
Electromagnet 14r provided on the outer periphery of 4g and X-ray tube body 1
A cathode 1-1 is provided which rotates about the center line of the X-ray tube 14 in synchronization with the position of the X-ray tube 14 with respect to the patient 1-3 VC by a magnet 14J provided in the patient 1-3 VC.
The cathode 1. without deflecting the generated electron beam. B
Rotate itself in synchronization with the position of the X-ray tube 14, (b)
The reason is that the X@ generated by the anode 14 can be used to irradiate the patient 13 regardless of the position of the X-ray tube 14.

In the embodiment described above, the means for maintaining the same attitude of the X-ray Haupe 12 was composed of the decelerator 11c1, the guide gear 10AL, and the Haupe gear 12α, but as a modification, the means is shown in FIG. It may be configured as shown.

As shown in FIG. 10, the means for maintaining the same posture of the X-ray hauppe 12 is the X-ray haupe insertion hole 11 formed in the rotation frame 11! The incisor gear 11t provided on the circumferential surface of I and the X-ray haupe insertion hole 11y have a gear ratio determined to maintain the same attitude of the Xa haupe regardless of rotation of the rotation frame 11.
Haupe gear 12α to support X-ray Haupe 12 within
The construction is made up of four reducer gears 11 that mesh with the incisor gear 11t and an arm (not shown) that supports the four reducer gears 11j, and regardless of the rotation of the rotation frame 11, The X-ray tube 1 is placed inside the oXm Haupe 12 so that the posture of the Haupe 12 remains the same.
4 is fixed, so it goes without saying that the attitude of the X-ray tube 14 is also maintained the same.

(8) Effects of the Invention Explaining in detail above, according to the present invention, the following effects can be achieved. In other words, the posture of the X-ray tube and X-ray tube remain the same regardless of the rotation of the rotation frame, so no matter how many times the rotation frame is rotated in the same direction, the height at which it is attached to the X-ray tube remains the same. Voltage cables do not get twisted. Therefore, the X-ray CT apparatus according to the present invention can perform continuous scanning at high speed, making it possible to perform rapid diagnosis.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a conventional X-ray CT device, and Fig. 2 is an explanatory diagram showing a conventional X-ray CT device.
FIG. 3 is a full cross-sectional perspective view schematically showing the scanner body of the XmCT apparatus which is an embodiment of the present invention, FIG. 3 is a vertical cross-sectional view schematically showing the X-ray Haupe, and FIG.
- Schematic cross-sectional view taken along line A'; Figure 5 II'i; cross-sectional view schematically showing the X-ray tube; Figures 6 (α) to (d) are explanatory diagrams showing the movement of the X-ray Haube; The figure is an explanatory diagram showing the relationship between an X-ray tube and X-ray irradiation, and FIGS. 8 to 10 are explanatory diagrams showing modifications of the present invention. 10... Base frame, 10a... Frame storage section,
10h...Guide gear, 10C...Detector play,
11... Rotation frame, 11a... Rotation frame gear, 11k... Shooting hole, 11C
...Decelerator, 11d...X-ray haupe storage section, 11e
...Input gear, 11f...Output gear, 11g...
X-ray Haube insertion hole, 11A...X-ray slit), 111
...Housing, 12...Xi Haupe, 12α...Haupe gear, 12b...X-ray irradiation port, 12'-12dji
2g...Cable guide pipe, 12f...Flexible joint, 121...Cooling oil, 12h
...Oil cooler, 12i...Haube body, 1
3...Subject (patient), 14...X-ray tube, 14α
...Anode cable, 14b...Cathode cable, 14
C... Rotor cable, 14d... Rotor, 14e
...X-ray tube body, 14f...Cathode connector, 14
1...Anode connector, 14ru...Conductor wire, 141...
・Cathode filament, 14j, 14k...deflection coil, 14no...diaphragm, 14m...bearing, 14
n...Rotating anode, 140...X-ray irradiation port.

Claims (1)

[Claims] In an XICT device that includes at least a scanner body that irradiates X-rays from an X-ray tube that rotates around the subject to obtain x# transmission data, the XICT device rotates around the subject without rotating the X-ray tube. a means for moving the X-ray tube, a means for moving the X-ray focal point position in synchronization with the movement of the X-ray tube to irradiate the subject with X-rays from the X-ray tube, and a power source for the X-ray tube and the X-ray tube. An X-ray CT device, characterized in that it is equipped with a cable that connects to a power supply device, and enables high-speed and continuous rotational scanning with an X-ray tube without twisting the cable connected to the Xm tube. .