JPH0648606U - X-ray CT system - Google Patents

Abstract

(57) [Summary] [Purpose] In an X-ray CT apparatus in which the bed moves up and down and the gantry tilts, the tilting motion of the gantry is automatically stopped at an appropriate position before the gantry comes into contact with the subject. Eliminate anxiety and danger. [Structure] Distance measuring sensors 2 and 2 for measuring a distance between a subject 4 on a bed 3 and an outer cover 1a of a gantry 1, and distances measured by the distance measuring sensors 2 and 2 are set to preset values. A tilting motion stop control means 7 for outputting a tilting motion stop signal of the gantry 1 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an X-ray CT apparatus in which a bed moves up and down and a gantry tilts.

[0002]

[Prior art]

 This type of X-ray CT apparatus has a safety function so that the subject on the bed will not be pinched between the gantry and the bed when the gantry is tilted. In a conventional X-ray CT apparatus, such a safety function is achieved by attaching a sheet-like pressure sensor to the outer cover of the gantry, and when the outer cover of the gantry tilts and the outer cover comes into contact with the subject on the bed, the above-mentioned pressure is applied. The sensor operated, and the tilting motion of the gantry was automatically stopped.

[0003]

[Problems to be solved by the device]

 In this kind of X-ray CT apparatus, the tilting of the gantry is usually performed by an operation switch on the gantry. In other words, since the subject is tilted while looking at the subject close to the subject, the subject does not come into contact with the gantry (exterior cover). That is, the tilting is stopped before the safety function is activated.

However, in remote operation, the subject is often not clearly visible from the operating position, and there is a high risk that the subject will come into contact with the gantry (exterior cover). Although the above-mentioned safety function finally works, this not only makes the subject extremely anxious but also dangerous, and conventionally, improvement in this respect has been demanded.

An object of the present invention is to provide an X-ray CT apparatus in which the tilting movement of the gantry is automatically stopped at an appropriate position before the gantry comes into contact with the subject, thereby eliminating anxiety and danger of the subject. .

[0006]

[Means for Solving the Problems]

 The above-mentioned purpose is to measure the distance between the subject on the bed and the exterior cover of the gantry, and the tilt motion stop signal of the gantry when the distance measured by this distance measurement sensor reaches a preset value. It is achieved by providing a tilting motion stop control means for outputting.

[0007]

[Action]

 When the gantry is tilted, the distance measuring sensor measures the distance between the subject and the gantry exterior cover. When the distance between the outer cover of the gantry and the subject reaches a set value (for example, about 20 mm), the tilting motion stop control means outputs a tilting motion stop signal for the gantry. As a result, the gantry tilting motion is stopped before the gantry comes into contact with the subject, and the anxiety and danger of the subject are eliminated.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an X-ray CT apparatus according to the present invention. In FIG. 1, reference numeral 1 is a gantry that can be tilted (see arrow B), and 1a is an exterior cover of the gantry 1. Reference numerals 2 and 2 are distance measuring sensors provided on the outer cover 1a, for example, ultrasonic echo type distance measuring sensors.

Further, 3 is at least a vertically movable bed, 4 is a subject laid on the bed 3, 5 is a central operation console, 6 is a signal converter provided in the gantry 1, and 7 is tilting. It is a CPU that is the main component of the operation stop control means.

Next, the operation of the device of the present invention will be described. Now, assume that a tilting signal is sent from the central console 5 to the gantry 1 and the gantry 1 is tilting. At this time, the distance measuring sensors 2 and 2 constantly detect the distance between the subject 4 and the outer cover 1a. Distance detection signals from the distance measuring sensors 2 and 2 are given to the CPU 7 via the signal converter 6, and the CPU 7 constantly calculates the distance between the outer cover 1a and the subject 4.

When the calculation result, that is, the distance between the subject 4 and the outer cover 1a reaches a preset value, for example, 20 mm, the CPU 7 outputs a tilting motion stop signal of the gantry 1 to tilt the gantry 1. Stop the operation. This eliminates the subject's anxiety and danger.

[0012]

[Effect of device]

 As described above, according to the present invention, the tilting of the gantry can be automatically stopped before it comes into contact with the subject, and the anxiety and danger of the subject can be eliminated.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention.

[Explanation of symbols]

 1 gantry 1a outer cover of gantry 2 distance measuring sensor 3 bed 4 subject 5 central console 6 signal converter 7 CPU (tilt motion stop control means)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Creator Masatoshi Sato 1-1-14 Kanda, Chiyoda-ku, Tokyo Inside Hitachi Medical Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An X-ray CT apparatus in which a bed moves up and down and a gantry tilts, and a distance measuring sensor for measuring a distance between an object on the bed and an outer cover of the gantry, and the distance measuring sensor. An X-ray CT apparatus, comprising: tilting motion stop control means for outputting a tilting motion stop signal of the gantry when a measured distance reaches a preset value.