JPS5837367Y2 - X-ray source position adjustment device for CT equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a position adjustment device for an X-ray source of a CT apparatus.

In a CT apparatus, more specifically in a scanning mechanism, an X-ray beam emitted from an X-ray source must be accurately incident on a detection section of an X-ray detector, such as a detector collimator.

However, it is extremely difficult to obtain such a relative positional relationship between the X-ray source and the X-ray detector by simply assembling the X-ray source and the X-ray detector due to manufacturing errors and assembly errors in the elements, for example. Adjustment is made so that the X-ray beam is accurately incident on the detection section of the detector.

Conventionally, this adjustment has been carried out by providing a large-sized hole, commonly known as a hole, in the X-ray tube container, and slightly moving the X-ray tube container containing the X-ray tube, while fixing the hole to one position with a screw.

However, the heavy X-ray tube container must be moved many times while aiming for the X-ray detector far away, and this must be done while being obstructed by other mechanical parts, which requires considerable effort and time. The current situation is that this is necessary.

An object of the present invention is to easily and quickly adjust the relative positional relationship between an X-ray source and an X-ray detector.

An object of the present invention is to provide a position adjustment device with an X-ray source.

An embodiment of the X-ray source position adjustment device of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows this X-ray source position adjustment device together with the scanning mechanism of the CT apparatus.

The X-ray source 1 is equipped with an X-ray tube and a collimator, and the collimator converts the X-rays emitted from the X-ray tube into a fan beam X.
It is converted to line 2.

On the other hand, the X-ray detector 3 has a collimator and a group of X-ray detection elements, and transmits the fan beam X-rays through the collimator.
The beam is made incident on the line detection element group.

These X-ray sources and X-ray detectors are installed in a frame 5 that is installed in a rotary frame 4 so as to be linearly movable.

The position adjustment device 10 according to the present invention includes an X-ray source 1 and a frame 5.
The X-ray source is placed between the X-ray detector in the longitudinal direction (hereinafter referred to as the
(hereinafter referred to as the Y direction),
This allows the fan beam X-rays to be accurately incident on the collimator of the X-ray detector.

1 and 3 to 5 show details of the arrangement for adjusting the position of the X-ray source.

The support plate 11 has two plate members 11 a and 11 b joined together in a T-shape, and a stiffener 11 C is provided on a pair of opposing wall surfaces.

The support plate is placed so that the remaining pair of opposing walls are in contact with the walls of the moving frame, and is fixed to the linear moving frame by welding, bolting, or the like.

A notch 12 through which the radiation port or collimator of the X-ray tube passes is formed at the front end of the plate 11a of the support plate overhanging the linear motion frame.

On the other hand, the sliding plate 13 has almost the same shape as the plate material 11a of the support plate, and is laminated on the plate material 11a.

On the surface of the supporting plate plate 11a facing the sliding plate,
A straight groove 14 is formed from the front edge to the rear edge, that is, in the Y direction.

A guide member 1 is provided on the surface of the sliding plate facing the plate member 11a.
5 are fixed by bolts 16, as best shown in FIG.

This guide member is engaged with the linear groove 14 and allows the sliding plate to be moved linearly in the Y direction.

On the other hand, a receiving member 17 is fitted into the straight groove 14 of the support plate at a distance from the guide member 15 and is fixed to the support plate with bolts 18 .

The receiving member engages with a recess provided in the sliding plate corresponding to the straight groove 14.

The elastic members of the receiving member 17 and the guide member 15 are arranged to be elastically deformed, and the guide member is moved in one direction together with the sliding plate.

The elastic member comprises, for example, a coil spring 19, which is inserted into the shaft protruding from the facing surfaces of the receiving member and the guide member and is compressed by these members.

A screw member 20 is screwed into the front end of the sliding plate, and its tip abuts against the surface of the receiving member 17 opposite to the contact surface of the coil spring, thereby compressing the coil spring 19.

Now, when the screw member is loosened and moved away from the receiving member 17 in the state shown in the figure, the sliding plate 13 is moved by the repulsive force of the coil spring 19, and in this state, the sliding plate is moved to the front. By pulling it to the side and fully screwing the screw member 20 into the receiving member 15, the coil spring 19 can be compressed again.

In order to ensure the movement of these sliding plates, several guide means are arranged in parallel.

In the figure, the guide pins designated by reference numeral 21 are screwed into the sliding plate from the outer surface thereof, and their tips engage in grooves 22 provided in the support plate parallel to the linear grooves 14.

In addition, the sliding plate includes support members 23 and 24 that support the X-ray source.
is provided.

These supporting members are formed by straight grooves 25.2 provided in the sliding plate.
It is mated to 6.

These straight grooves are arranged along the direction perpendicular to the aforementioned straight grooves 14, that is, along the X direction.

A receiving member 27 is engaged with the end of the straight groove 25 and fixed to the sliding plate with bolts 28.

The part 27 a that has entered the straight groove of the receiving member is the supporting member 2
A coil spring 29, which is an elastic member, is disposed between these opposing faces and inserted into the shaft of the receiving member, and is compressed by these members.

A screw member 30 is screwed into the side surface of the sliding plate 13,
Its tip can be brought into contact with the other end surface of the support member 23.

The figure shows a state in which the screw member is rotated, the tip moves on the support member, and the coil spring 29 is compressed.

When the screw member is loosened and the tip is separated from the support member, the support member will move due to the repulsive force of the coil spring.

The X-ray source is placed with the collimator and emission opening passed through the cutout 12, with the legs of the X-ray tube container resting on the two support members 23, 24 and engaging the grooves 23a in the support member 23.

By loosening the screw member 30, the X-ray source can be moved in the X direction together with the support members 23 and 24, and this movement is assisted by the repulsive force of the coil spring 29, allowing easy and quick positioning in the X direction. can.

Furthermore, by loosening the screw member 20, the X-ray source can be moved in the Y direction together with the support members 23, 24 and the sliding plate 13, and with the help of the repulsive force of the coil spring 19, similar to the movement in the X direction, Movement in the Y direction can be done easily and quickly.

In order to prevent the support member 23 from tilting or floating during these movements, a groove 31 is provided at the bottom of the linear groove 25, extending in the same direction as these grooves and narrower than the support member. Bolt 32 with a wider brim than the groove 25
is screwed into the support member 23.

Although not shown, the support member 24 is similarly configured.

When the X-ray source is adjusted to a predetermined position, each screw member 20,
The lock nuts 20 a and 20 b at 30 are rotated to prevent movement of the support member 23 and the sliding plate 13 .

The X-ray source itself is fixed by fastening the X-ray tube container and the sliding plate with flanged bolts 33.

However, in this device, a groove 34 is formed in the sliding plate 13 in parallel with the straight groove 25, and the plate body 11a of the support plate is also provided with elongated holes 35 and notches through which each flanged bolt 33 can move sufficiently. 36 is formed so that adjustment in the X and Y directions can be made even when the flanged bolt is temporarily fastened to the X-ray tube container in advance.

The embodiment described above is a CT scan that performs linear scanning and rotational scanning.
Although the present invention has been described with reference to a CT apparatus, it is obvious that it is also useful in a CT apparatus that performs only rotational scanning.

As shown in the embodiments described above, the X-ray source position adjustment device of the present invention consists of a support plate fixed to the rotating frame or linear movement frame of the zero-piece device, and a sliding plate placed on the support plate. a support member disposed on the sliding plate and supporting the X-ray source; means for linearly moving the sliding plate; and means for moving the supporting member in a direction perpendicular to the sliding plate; The means includes a linear groove provided on the support plate, a guide member engaged with the linear groove and fixed to the sliding plate, and a receiving member provided on the support plate opposite to the guide member. It has an elastic member disposed between the members to be elastically deformed, and a threaded member screwed into the sliding plate and having an end abutted on the guide member so as to maintain the elastic deformation of the elastic member. , the latter means includes a straight groove provided on the sliding plate perpendicularly to the linear groove and engaging with a part of the supporting member, a receiving member provided on the sliding plate facing the supporting member, and a supporting member. an elastic member arranged to be elastically deformed between the member and the receiving member;
The X-ray source can be moved by rotating the screw member, since the screw member is screwed into the sliding plate and has its end abutted against the support member so as to maintain the elastic deformation of the elastic member. Moreover, since the movement is assisted by the action of the coil spring, the labor and time required for adjustment work can be greatly reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the X-ray source position adjustment device of the present invention, in which Fig. 1 is a perspective view, Fig. 2 is an explanatory view showing an example of a state in which it is installed on a CT apparatus, and Fig. 3 is a plan view. , FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. 3, and FIG. 5 is a cross-sectional view taken along the line ■--■ in FIG. 3. 11...Support plate, 13...Sliding plate, 1
4... Straight groove, 15... Guide member, 1
7... Receiving member, 19... Elastic member, 2
0... Screw member, 23... Supporting member,
25... Straight groove, 27... Receiving member, 2
9...Elastic member, 30...Screw member.

Claims (1)

[Scope of utility model registration request] A support plate fixed to a rotating frame or a linear movement frame of a CT device, a sliding plate placed on the support plate, a support member disposed on the sliding plate and supporting an X-ray source, and a sliding plate. and a means for moving the supporting member in a direction perpendicular to the sliding plate, the former means being engaged with a linear groove provided in the supporting plate and the sliding plate. a guide member fixed to the guide member, a receiving member provided on the support plate opposite to the guide member, an elastic member arranged to be elastically deformed between the guide member and the receiving member, and an elastic member that is elastically deformed. a threaded member screwed into the sliding plate and having an end abutting the guide member so as to maintain the support member; A linear groove that partially engages with the support member, a receiving member provided on the sliding plate facing the supporting member, an elastic member disposed with elastic deformation between the supporting member and the receiving member, and an elastic member. 1. An X-ray source position adjustment device for a CT apparatus, comprising a screw member screwed into a sliding plate and having an end abutted against a support member so as to maintain elastic deformation.