JP2003000582A - X-ray ct system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lay a cable without damaging the tilting angle of a gantry, to use a general planar safety switch and to provide uniform sensitivity over an entire subject. SOLUTION: In the X-ray CT system having the gantry with an X-ray vessel or an X-ray detector arranged therein, a cover for the part of the gantry for passing the subject placed on the top plate of a bed is configured conical and one part of that conical cover is constituted into plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gantry of an X-ray CT apparatus, and in particular, a cover of a portion through which a subject of the gantry of the X-ray CT apparatus is placed on a tabletop of a bed and passes therethrough is formed into a cone shape. The present invention relates to an X-ray CT apparatus in which a part of the cover is configured to be flat.

[0002]

2. Description of the Related Art In a gantry of an X-ray CT apparatus, an internal mechanism of the gantry such as an X-ray tube and a detector collects image data while rotating around a subject, and an imaging area is provided. In order to maximize the opening diameter of the subject passage portion in order to ensure the maximum, the cover of the portion through which the subject is placed on the top of the bed and passes through has a conical shape.

In the X-ray CT apparatus, the gantry may be tilted while the subject is placed in the opening at the time of photographing. When shooting with the maximum tilt angle, the operator tilts the subject to the limit where the gantry cover makes contact. It is necessary to stop the tilting movement, so that on the surface of the conical cover,
A safety switch is provided. This safety switch used a tape-shaped or conical mat switch to fit along the cover.

[0004]

The above-mentioned conventional safety switch has a problem that the contact detecting portion is limited when the tape-shaped safety switch is used. To solve this, we are using a cone shape, but to match the cover to the cone shape,
A general-purpose flat mat switch cannot be used, and it was necessary to manufacture a special switch that matches the shape of the cover. This made it expensive.

Further, since these safety switches have a structure in which a contact is pressed to turn the switch on (or off) by contact, the central portion of the cone comes into contact with the subject at a right angle to the inclination direction, and the end of the cone becomes Since the test subject comes into contact with the subject at an angle, there is a problem in that there is a difference in sensitivity between the central portion and the end portion.

Further, the larger the opening diameter of the conical cover, the larger the tiltable angle of the gantry can be secured, which is advantageous, but the cable such as the microphone and the display attached to the cover is externally connected. In order to wire to the cable, it is necessary to lay the cable along the inner surface of the conical cover on the side of the rotating mechanism. In order to avoid contact between the cable and the rotating mechanism portion, it is necessary to reduce the opening diameter by the cable diameter, and if the opening diameter is reduced, the tiltable angle of the gantry also becomes small.

An object of the present invention is to provide a technique capable of laying a cable without impairing the tiltable angle of the gantry.

Another object of the present invention is to provide a technique capable of using a plane type safety switch having general versatility and capable of obtaining a uniform sensitivity to a subject. is there.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0010]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

(1) In an X-ray CT apparatus having a gantry in which an X-ray tube and an X-ray detector are arranged, a cover of a portion where a subject of the gantry is placed on a tabletop of a bed and passes through is conical. The conical cover is partly flat.

(2) In an X-ray CT apparatus having a gantry in which an X-ray tube and an X-ray detector are arranged, a cover of a portion through which a subject of the gantry is placed on a tabletop of a bed and passes through is conical. In this configuration, a part of the conical cover is formed into a flat surface, and the cable is laid inside the flat surface portion.

(3) In an X-ray CT apparatus having a gantry in which an X-ray tube and an X-ray detector are arranged, a cover of a portion where a subject of the gantry is placed on a bed of a bed and passes through is conical. In this configuration, a part of the conical cover is formed into a flat surface, and the safety switch is installed inside the flat surface portion.

According to the above-mentioned means, by making a part of the conical cover of the gantry on which the X-ray tube and the X-ray detector are arranged into a flat surface, a versatile flat switch can be used. Since this plane switch is in constant contact with the subject at a right angle, uniform sensitivity can be obtained over the entire surface.

Further, by providing the flat surface portion in the dead space in the arrangement with the bed top plate, it becomes possible to lay the cable inside the flat surface portion without impairing the tiltable angle of the gantry.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the drawings together with an embodiment (example) of the invention.

In all the drawings for explaining the embodiments of the invention, those having the same function are designated by the same reference numerals, and the repeated description thereof will be omitted.

(Embodiment 1) FIG. 1 is a sectional view showing the structure of part of the side surface of an X-ray CT apparatus according to Embodiment 1 of the present invention.

In the X-ray CT apparatus according to the first embodiment, as shown in FIG. 1, the rotating mechanism unit 1 having an X-ray tube, a detector and the like mounted thereon has a bed top plate 3 on which a subject 2 is placed. Image data is collected while rotating around. The conical cover 4 of the gantry is located between the subject 2 and the rotation mechanism unit 1 and is fixed to the gantry frame 5.

FIG. 2 is a cross-sectional view showing a side surface of the relationship between the conical cover 4, the bed top plate 3 and the subject 2 when the gantry is tilted rearward, and FIG. 3 is a front view thereof. is there.

The conical cover 4 approaches the subject 2 as the inclination angle increases. Therefore, the flat surface portion 6 is provided on a part of the upper side of the conical cover 4, and the flat surface type safety switch 7 is attached to the flat surface portion 6. The flat safety switch 7 detects contact between the conical cover 4 and the subject 2.

According to the configuration of the first embodiment, it is possible to use the plane type switch 7 which is inexpensive and versatile as a safety switch, and the plane type switch 7 is always perpendicular to the subject 2. Since the contact is made from the direction, the operation sensitivity to the subject 2 can be made uniform in the entire safety switch.

(Embodiment 2) FIG. 4 shows each of the conical cover 4, the bed 3 and the subject 2 when the gantry of the X-ray CT apparatus according to Embodiment 2 of the present invention is tilted forward. FIG. 5 is a side sectional view showing the configuration of the relationship of FIG. 5, and FIG. 5 is a front view thereof.

A flat surface portion 6 is provided on a part of the conical cover 4 of the gantry on the rotation mechanism portion 1 side (lower side).
A cable 8 from a microphone or a display attached to the cover is laid along the inner surface (on the side of the rotation mechanism 1) of the. The cable 8 is routed to the outside through the flat portion 6 of the conical cover 4.

According to the construction of the first embodiment, since the lower surface of the bed top plate 3 is linear, the contact points with the opening circle 9 of the conical cover 4 are only at both ends of the bed top plate, and the central portion is open. There is no contact with Yen 9. Therefore, even if this portion is used as the plane portion 6, there is no influence on the tiltable angle of the gantry.
Therefore, by passing the cable 8 through the flat portion 6,
The diameter of the opening of the conical cover 4 can be reduced in consideration of the cable diameter, and wiring can be performed without affecting the gantry inclination angle.

The inventions made by the present inventors are as follows.
Although the specific description has been given based on the embodiment of the invention, the invention is not limited to the embodiment of the invention and can be variously modified without departing from the scope of the invention. .

[0027]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.

According to the present invention, a general-purpose flat type safety switch can be used by making a part of the conical cover of the gantry on which the X-ray tube and the X-ray detector are arranged flat. Therefore, uniform sensitivity can be obtained on the entire surface of the subject.

Further, by providing the flat portion in the dead space in the arrangement with the bed top plate, the cable can be laid inside the flat portion without impairing the tiltable angle of the gantry.

[Brief description of drawings]

FIG. 1 is a sectional view showing a part of a side surface of an X-ray CT apparatus according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a side surface of the relationship between the conical cover, the bed top plate, and the subject when the gantry of the first embodiment is tilted rearward.

FIG. 3 is a front view of FIG.

FIG. 4 is a cross-sectional view showing a side surface of the relationship between the conical cover, the bed top plate, and the subject when the gantry of the X-ray CT apparatus according to the second embodiment of the present invention is inclined forward.

FIG. 5 is a front view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotation mechanism part, 2 ... Examinee, 3 ... Bed top plate, 4 ... Conical cover, 5 ... Gantry frame, 6 ... Flat part, 7 ... Plane type safety switch, 8 ... Cable, 9 ... Open circle

Claims (3)

[Claims] 1. In an X-ray CT apparatus having a gantry in which an X-ray tube and an X-ray detector are arranged, a cover of a portion through which a subject of the gantry is placed on a bed of a bed and passes through is conical. And an X-ray CT apparatus characterized in that a part of the conical cover is formed into a flat surface. 2. In an X-ray CT apparatus having a gantry in which an X-ray tube and an X-ray detector are arranged, a cover of a portion through which a subject of the gantry is placed on a bed of a bed and passes through is conical. The X-ray CT apparatus according to claim 1, wherein a part of the conical cover is formed into a flat surface, and a cable is laid inside the flat surface portion. 3. In an X-ray CT apparatus having a gantry in which an X-ray tube and an X-ray detector are arranged, a cover of a portion through which a subject of the gantry is placed on a bed of a bed and passes through is conical. An X-ray CT apparatus characterized in that a part of the conical cover is formed into a flat surface, and a safety switch is installed inside the flat surface portion.