JPH11226007A - X-ray ct device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the anxiety of a testee to a device by making the inside invisible from a window part for a projector in a state other than the positioning of the X-ray irradiation of the testee in a CT device. SOLUTION: A liquid crystal plate (5) is used as a window 5 provided on a window hole 4, a power source 8 and a switch 9 connected to it are provided inside a cover 1, the switch 9 is connected to the electrode terminal 10 of the liquid crystal panel (5) of the window 5 and the transparency/opaqueness of the liquid crystal panel (5) is controlled by the ON/OFF of the switch 9. That is, in the case that the switch 9 is ON, the liquid crystal plate (5) becomes transparent, light 7 from the projector 6 is passed through and the X-ray irradiation position of the testee 3 is positioned. In the case that the switch 9 is OFF, the liquid crystal plate (5) becomes opaque and the inside of the cover 1 is not viewed from the testee 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray CT apparatus, and more particularly to a window of a projector for positioning an X-ray irradiation of a subject.

[0002]

2. Description of the Related Art In a scanner of an X-ray CT apparatus, a positioning projector for aligning an imaging position of a subject with an X-ray irradiation position is located inside a cover of the scanner, so that a light beam emitted from the projector is passed. Then, a hole is formed in the cover, and a window made of a transparent or translucent material is attached to the hole.

[0003]

As described above, if a transparent or translucent window is provided in the cover hole, the subject can see the mechanical parts inside the scanner, so that the subject is uneasy. ， It will give fear.

If the material of the window is made of a material having low transparency in order to alleviate this, the light beam for positioning becomes weak, and it becomes difficult to perform positioning. In order to obtain a sufficient amount of light for positioning the subject, a large-output projector is required, which has an adverse effect on cost, power consumption, and the like.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a CT apparatus provided with a positioning projector for a subject and a window through which a beam to be emitted passes. The window was configured to be transparent to allow passage of the light beam when there was a light beam, and opaque when the light beam was absent.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 and 2, 1 is C
This is the cover of the T scanner. Reference numeral 2 denotes a cavity for placing the subject 3 in the X-ray irradiation position. Reference numeral 4 denotes a window hole provided in the cover 1 symmetrically with respect to the cavity 2. Reference numeral 5 denotes a window attached to the window hole 4. Reference numeral 6 denotes a light projector provided inside the cover 1, which is symmetrically arranged. 7 is a projector 5 to a window 5
The X-ray irradiates the subject 3 with X-rays before the X-ray irradiation.

In the present invention, as shown in FIG. 3, a liquid crystal plate (5) is used as a window 5 provided in a window hole 4, while a power supply 8 and a switch 9 connected thereto are provided in a cover 1. The switch 9 is connected to the electrode terminal 1 of the liquid crystal plate (5) of the window 5.
0, and the transparency and opacity of the liquid crystal plate (5) are controlled by turning on and off the switch 9. That is, when the switch 9 is turned on, the liquid crystal plate (5) becomes transparent, passes the light 7 from the projector 6, and positions the X-ray irradiation position of the subject 3, and the switch 9 is turned on. When the switch is off, the liquid crystal plate (5) becomes opaque, so that the subject 3 cannot see the inside of the cover 1.

FIG. 4 shows a state in which the projector 6 shown in FIG.
, And the on / off operation of the switch 9 causes the on / off of the light projector 6 and the transparency and opacity of the liquid crystal plate (5) to be linked.

FIGS. 5 and 6 show another embodiment of the present invention, in which a shutter 11 is arranged inside a cover 1, and FIG.
This is slidably mounted on the rail 12. That is, two rails 12 are provided so as to sandwich the window 5 in the cover 1, and both ends of a shutter 11 are slidably mounted on the rails 12.
To cover the window 5. In this case, the window 5 is made of a transparent member. As a means for moving (opening and closing) the shutter 11 by the driving device 13, a motor may be used as the driving device 13, and the shutter 11 may be driven by a motor shaft, a pulley, and a chain.
Reference numeral 14 denotes a control device for controlling the driving device 13.

[0010]

According to the present invention, the inside of the subject cannot be seen from the subject, so that the subject does not feel terrified and the anxiety of the subject can be reduced. In addition, since the light beam emitted from the light projector is not attenuated in the window, a sufficient amount of light can be obtained with the low-power light projector, and the size and power consumption can be reduced.

Furthermore, since the light beam becomes clear, the positioning of the subject can be performed easily and accurately in a short time.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a block diagram showing a specific embodiment of the present invention.

FIG. 4 is a block diagram showing another embodiment of FIG. 3;

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a diagram for explaining the driving means of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover 2 Cavity 3 Subject 4 Window hole 5 Window 6 Floodlight 7 Light beam 8 Power supply 9 Switch 10 Electrode terminal 11 Shutter 12 Rail

Claims (1)

[Claims] 1. A CT apparatus having a positioning projector for a subject and a window for passing a light beam to be emitted from the CT projector, when a light beam emitted from the projector exists, the window passes the light beam. An X-ray CT apparatus characterized in that the window is made opaque when the light beam is transparent and the light beam does not exist.