JPS63135136A - X-ray tomographic 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 (Field of Industrial Application) The present invention relates to an X-ray tomography apparatus, and more particularly to correction of an imaging position when a gantry is tilted.

(Conventional Technique vFI) When performing imaging with an X-ray 117i layer device, it is important to accurately position the subject (patient) at a predetermined imaging position.

Such positioning is performed using a positioning light provided on the imaging surface of the gantry and a positioning light provided outside the imaging surface of the gantry.

FIG. 3 is an explanatory diagram of positioning, in which (a) shows the case where the inclination angle of the gantry is O', and (b) shows the case where the gantry is inclined. In the figure, 1 is a cradle, 2 is a subject, 3 is a gantry, 4 is an internal positioning light provided on the imaging surface of the gantry 3, and 5 is a
is an external positioning light provided outside the imaging surface of the gantry 3.

As shown in <a>, when the inclination angle of the gantry 3 is O6, accurate positioning can be performed using any of the positioning lights 4.5.

(Problem to be Solved by the Invention) However, when the gantry 3 is tilted with respect to the cradle 1 as shown in FIG. -1 shift and dl shift in the horizontal direction, making it impossible to perform accurate positioning. In addition, although such positional deviation does not occur with the internal positioning light 4,
Since the gantry 3 and the gantry 3 are close to each other, the workability is poor and it is very difficult to use.

The present invention has been made in view of the above problems, and its purpose is to correct the positional shift of the external positioning light when the gantry is tilted, and to accurately position the subject at a predetermined imaging position. A sequence of operations for positioning is made clear to the operator at each step.
The purpose of the present invention is to provide a line tomography device.

<Means for Solving the Problems> The present invention which solves the above-mentioned problems has a gantry arranged so as to be tiltable with respect to a table having a horizontally movable cradle and configured to be vertically movable. In the X-ray tomography apparatus, a means for detecting the inclination angle of the gantry with respect to the table, and a correction amount d H for the vertical deviation of the imaging position and a correction lid L for the horizontal deviation of the imaging position according to the detected inclination angle are calculated. means for moving the table in the vertical direction according to the vertical correction amount d+1; and means for calculating a correction lid L' for the horizontal deviation of the photographing position according to the vertical correction amount dH. , a means for moving the cradle in the horizontal direction according to the horizontal corrections 1d l- and dL', and a plurality of display elements selectively driven according to a series of operating procedures. It is something.

<Function> According to the X-ray tomography apparatus of the present invention, after the deviation of the imaging position in the vertical direction is corrected according to the inclination angle of the gantry, the deviation of the imaging position in the horizontal direction is corrected, and the external positioning light is Accurate positioning is performed based on The operating procedure necessary for such a series of positioning is clearly shown to the operator by selectively driving the display element for each step.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the xmi layer disconnection device according to the present invention, and the same parts as in FIG. 3 are designated by the same reference numerals. In the figure, 6 is a table on which the cradle 1 is arranged so as to be movable in the horizontal direction, and 7 is a hydraulic pump for moving the table 6 in the vertical direction. Furthermore, cradle 1
moves horizontally on the table 6 according to the rotation of the stepping motor 8, and the encoder 9 detects the movement. Further, the movement of the table 6 in the vertical direction is detected by a potentiometer 10. 11 is gantry 3
This is a motor that tilts and drives the motor, and the tilt angle is detected by a potentiometer 12.

13 is an operation panel, which includes a switch 14 for advancing the scan, a switch 15 for raising the table 6, a switch 16 for lowering the table 6, and a switch 17 for moving the cradle 1 in the direction of the gantry 3. , display elements (for example, LED) 18, 19, 20 are arranged corresponding to these switches 15, 16, 17 and selectively driven.

A control board 21 is provided with a microprocessor 22 for driving and controlling each part.

The operation of the device configured in this way is shown in flowchart 1 in Fig. 2.
This will be explained using P-to.

First, the switch 14 is turned on to proceed with scanning (step ■). Next, the inclination angle of the gantry 3 is detected from the output of the potentiometer 12 (step 2).

Then, from the detected inclination angle, a vertical correction fid
H and the horizontal correction fad L are calculated (step 2). The inclination angle is classified into three types: 0°, FWD, and BWD. In the case of BWD, since the table 6 must be lowered, the display element 19 corresponding to the switch 16 is driven (step 2). This display element 19
The switch 16 is turned on in response to the drive of the controller (step ■). As a result, the table 6 begins to descend, and stops after descending d)l (step ■).

When the table 6 stops at a predetermined position, the table 6
Horizontal correction amount d of cradle 1 due to vertical movement
Calculate L' (step ■). On the other hand, the inclination angle is F
In the case of WD, since the table must be raised, the display element 18 corresponding to the switch 15 is driven (step 2).

In response to this driving of the display element 18, the switch 15 is turned on (step 2). As a result, the table 6 starts to rise and stops when dH reaches the upper limit (step ■). When the table 6 stops at a predetermined position, the horizontal correction amount dL of the cradle 1 due to the table 6 rising by dH
' is calculated (step 0). In the step where the calculation of the horizontal correction amount dL' of the cradle 1 according to the vertical movement of the table 6 is completed, the inclination angle becomes Oo, and the following is the processing procedure when the inclination angle is Oo. Follow. That is, when the inclination angle is O''', the display element 20 corresponding to the switch 17 is driven because it is sufficient to move the cradle 1 in the horizontal direction (step ■). Accordingly, switch 17
Turn on (step ■). As a result, the cradle 1 stops after moving a predetermined number of seedlings in a predetermined direction according to dl and dl' (step [phase]).

This allows accurate positioning by the external positioning light 5. In this series of operation steps, the display elements 18, 19, 20 corresponding to the switches 15, 16, and 17 to be operated are sequentially and selectively driven, so that the operator can perform appropriate switch operations. can.

In this example, the vertical movement of the table and the horizontal movement of the cradle are sequentially operated using separate switches, but if sufficient safety is ensured even if simultaneous operations are performed, Alternatively, a single switch may be used to simultaneously perform position correction in the vertical and horizontal directions.

(Effects of the Invention) As described above, according to the present invention, even when the gantry is tilted, it is possible to accurately position the subject at a predetermined shadow position, and also to perform a series of operations. XvA with excellent operability as the procedure can be clearly explained to the operator
Fault mounting can be realized. −

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is a flow chart for explaining the operation of the conventional apparatus. 1... Cradle 2... Subject 3... Gantry 4... Internal positioning light 5... External positioning light 6... Table 7... Hydraulic pump 8...
・Stepping motor 9...Encoder 10.12...Potentiometer 11...Motor 13...Operation panel 14
．． 15.16.17... Switch 18.19.20.
... Display element 21 ... Control board 22 ... Microprocessor Patent applicant Yokogawa Medical Systems Corporation Figure 3 (a) (b) ]i Cradle 3 - Gantry

Claims (1)

[Claims] In an X-ray tomography apparatus in which a gantry is tiltably arranged with respect to a table having a horizontally movable cradle and configured to be vertically movable, means for detecting the tilt angle of the gantry with respect to the table; means for calculating a correction amount dH for the vertical deviation of the photographing position according to the inclination angle and a correction amount dL for the horizontal deviation, and means for moving the table in the vertical direction according to the vertical correction amount dH; means for calculating a correction amount dL' for the horizontal shift of the photographing position in accordance with the vertical correction amount dH; and means for moving the cradle in the horizontal direction in accordance with the horizontal correction amounts dL and dL'; 1. An X-ray tomography apparatus comprising: a plurality of display elements that are selectively driven according to operating procedures.