JPS6329627A - Specimen positioning apparatus for ct apparatus - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a CT device (prior art) capable of obtaining diagnostic images, for example, an X-ray tomography device shown in FIG. In order to obtain a diagnostic image using this device, the subject 2 is sent into the shadow hole 3 in the gantry 1, and the X-ray tube 4 is
x'#fA is emitted toward the subject from the subject, and the X-ray detector 14 detects the X-rays that have passed through the subject. Then, each time one concave irradiation is performed, the angle to the tomographic plane is changed by one degree and this is repeated, and after that, the angle is sequentially changed and X-ray absorption data for various angles of the tomographic plane of the affected area are collected. This data is analyzed using a computer to obtain tomographic images.

By the way, in order to obtain a desired tomographic image, it is necessary for the X-ray beam to accurately scan the slice plane, and for this reason, a beam fader is used to set the position of the subject with respect to the gantry 1 in advance. . Such a floodlight can be mounted on the pedestal 5 that supports the gantry 1, or on the rotating pedestal 6 housed inside the gantry 1, but the recent trend is to install it on the pedestal 5 that supports the gantry 1. In order to make the light more compact and to make the light easier to see, it is often attached to the rotating frame 6. In this case, the rotating frame 6
With devices that rotate 360 degrees, the projector returns to the same position as at the start of scanning, making it easy to position the next patient.
Many rotating frames have different stopping points, and conventionally the third
As shown, two projectors 7,7' are used. That is, in this OCT device r, when the rotary mount 6 is rotated in the direction A shown in the figure, the X-ray tube 4 stops at the position a shown in the figure, so positioning is performed by the horizontally positioned light emitting 57, while In this case, since the X-ray tube 4 stops at the position shown in the figure, positioning is performed using the projector 7', which is positioned horizontally at this time.

However, this CT apparatus requires two projectors, which is not only wasteful, but also causes a difference in the stopping point if the rotation angle of the rotating frame 6 is different, making it impossible for the projectors 7 and 7' to perform their functions. The drawback is that it cannot be done.

(Problems to be Solved by the Invention) As described above, in the conventional CT apparatus, two projectors must be provided corresponding to two different stopping points depending on the direction of rotation of the rotating frame, which is wasteful. I got angry.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a CT device that can position a subject using a single projector even if the projector is mounted on a rotating mount.

[Structure of the invention]

(Means for solving the problem) In the OCT apparatus of the present invention, a single light projector is provided on a rotating mount,
It is constructed by providing a control means for controlling a rotary gantry drive means to rotate the projector to a predetermined position when the projector is used.

(Function) In the OCT apparatus of the present invention, when using a single projector mounted on a rotating mount, the projector can be positioned at a predetermined target position. Regardless, the projector can be moved, for example, right sideways.

(Example) The present invention will be specifically explained below using Examples.

FIG. 1(a) is a schematic front view showing one embodiment of the present invention. This embodiment includes a rotating pedestal 6 provided with a single floodlight 7,
A large pulley 8, a belt 9, and a small pulley 1 are mechanisms for rotationally driving this rotating frame (rotation part) 6.
0 and a motor 11, a CPU 12 that controls the motor 11 and the projector 7, and a switch 13 consisting of a scanning switch 13-1 and a positioning switch 13-2.

On a rotating mount (rotation unit) 6 having an X-ray tube 4 and an X-ray detector 14 installed opposite thereto, a projector 7 is placed on the same circumference as the X-ray tube 4 and the X-ray detector 14. Moreover, it is placed approximately midway between the X-ray tube 4 and the X-ray detector 14. Inside the projector 7, there is a slit disk (not shown) with cross lines for positioning, a light source and a lens (
(not shown) are arranged, and the positioning switch 1
3-1 turns on the light source via the CPU 12.

The large pulley 8 is installed coaxially with the rotation section 6, a belt 9 is suspended between the large pulley 8 and the small boolean saw 10, and a motor is installed coaxially with the small pulley 10. The rotation part 6 is rotated by the operation of the rotation part 11. Further, the motor 11 is installed at the bottom inside the gantry 1. This motor 11 is operated by turning the switch 13 ON and OFF.
When the FF is applied, a signal output from the controller 12 is input to rotate for a predetermined time, and the rotation part 6 is rotated to a desired angle via the small pulley 6, belt 10, and large pulley 8. There is.

The drive mechanism for rotating the rotation section 6 and the controller 12 for controlling the motor 11 according to this embodiment are configured to be used in common with the structure for rotating the rotation section 6 during scanning.

The above configuration is shown in a block diagram in FIG. 1 (bl, and the rotary frame drive unit 6A is shown in FIG. 1 ta), including the large pulley 8, belt 9, small pulley IO, motor 11, and It is composed of an encoder that detects the current position of the rotating pedestal 6 by detecting the amount of rotation. Note that the motor 11 is preferably an electronic servo motor.

The rotating pedestal section 6B is composed of the X-ray tube 4, the rotating pedestal 6, and the X-ray detector 14 shown in FIG. 1fa). 7 is the projector, 12 is the CPU, and switch 13 is the scanning switch 1.
3-1 and a positioning switch 13-2.

Based on the above configuration, an example of the use of this embodiment will be explained with reference to FIGS. Figure 2 (al is the rotation unit 6 stopped at an arbitrary position)
shows. In this case, the operator of the CT device places the subject on the top plate (not shown) and then turns on the positioning switch.
do. The CPU 12 inputting the positioning signal outputs this signal to the projector 7 and determines whether the switch 13-2 is pressed or not. If the switch 13-2 is pressed, the rotating mount is set for the predetermined object positioning purpose. It is determined whether or not the motor 11 is at the position, and if no, the amount of rotation of the motor 11 from the stop position to the target position is calculated, and this calculation signal is output to the motor 11. The motor 11 inputting the calculation signal transmits its rotational power to the small pulley and then to the large pulley via the belt 9.
8 and rotates the rotation section 6 to the target position. In this case, the CPU 12 detects the current position of the rotary pedestal 6 via an encoder provided in the rotary pedestal drive unit 6A, and determines whether or not the rotary pedestal 6 has rotated to the target position. In this case, motor 11
By outputting a signal to stop the rotation of the motor 11 and stopping the motor 11 to which this signal has been input, the projector 7 is positioned directly beside the subject as shown in FIG. 2(b).

On the other hand, if the switch 13-2 is not pressed or if the rotating frame is already at the target position even if it is pressed, the CPU 12
outputs a stop signal to the rotary frame drive section 6A, so the rotary frame does not rotate.

Note that, for example, if the rotating pedestal 6 is stopped when the projector 7 is in the C position shown in FIG. -2 is pressed
The PU 12 calculates the rotation amount from the stop position to the target position, and the motor 11 rotates the rotating frame 6, and the floodlight 7 rotates the second
Rotate it in the opposite direction until it comes to the position shown in the figure (bl).

After the above actions, position the subject using the projector 7, turn off the switch 13-2, and place the subject in the photographing hole 6 (
(see FIG. 3), and the switch 13-1 is turned on to perform a predetermined scan.

In this way, with the object positioning device for a CT apparatus according to the present invention, a projector located at an arbitrary position can be moved to a predetermined position,
For example, it can be positioned right next to the subject.

〔Effect of the invention〕

According to the present invention described in detail above, when installing a floodlight in the rotation section, conventionally two floodlights were required, but
According to the present invention, the subject can be positioned using a single light projector.

[Brief explanation of the drawing]

FIG. 1(a) is a schematic front view showing an embodiment of the present invention, FIG. 1(b) is a block diagram of the embodiment of the present invention, and FIG. 2(a) shows the device stopped at any position. (1) shows the rotation part in the middle, (1) shows the result when the projector is positioned right next to it, (C) is a flowchart showing the operating procedure of an embodiment of the device of the present invention. Fig. 3 shows the conventional OCT device. It is a schematic front view. 1... Gantry, 5... Gantry support frame, 6
...Rotation part (rotating frame), 14...X-ray detector.

Claims (1)

[Claims] In a CT apparatus having a rotary pedestal that rotatably supports an X-ray tube and an X-ray detector, and a drive means for driving the rotary pedestal, a single light projector for positioning a subject disposed on the rotary pedestal. and a control means for controlling the drive means to rotate the light projector to a predetermined light projection position when the projector is in use.