JPS5849258B2 - X-ray tomography device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an X-ray tomography apparatus.

In an X-ray tomography apparatus, the case is supported by a support via a link mechanism in order to move the film parallel to the tomographic plane of the subject.

This linkage has a high mechanical precision, which must be maintained over a long period of time, and represents a significant portion of the cost of the entire tomography apparatus.

Furthermore, in order to obtain clear X-ray photographs, this type of device is equipped with an X-ray scattering prevention grid in the case, but this grid must be swung in response to the deflection angle of the support, which is complicated and expensive. Currently, many synchronization mechanisms are used.

The present invention provides an X-ray tomography device that not only reduces manufacturing costs but also greatly improves reliability and maintainability by making it possible to move the case and the X-ray scattering prevention grid with an extremely simple structure. This is what we provide.

Embodiments of the X-ray tomography apparatus of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 11 is a base, 12 is a column rotatably provided on the base, and 13 and 14 are X-ray lines attached to the columns facing each other with the rotation center O of the column in the middle. Shows the source and Butsuki case.

The pillar is rotated by a drive mechanism installed in the base, and the Butsuki case is moved in the opposite direction while maintaining a horizontal state with the pillar, and at the same time, the X-ray scattering prevention grid provided on the Butsuki case is moved to the pillar. is reciprocated in a direction perpendicular to the direction of movement.

FIG. 2 shows the mechanism for effecting this movement of the butsuki case and grit.

A shaft 21 is fixed to the column, and this shaft is held in a bearing on the base.

The column is rotated by rotating this shaft by a drive mechanism (not shown).

A slide 22 is movably mounted and is moved along the column 22 by a drive mechanism (not shown) and can be locked to the column at any position.

Butsuki cases extend from slides like this. expanding shaft 23
is rotatably attached to.

A pulley 24 is engaged with and fixed to the shaft 21.

The base has this pulley in the middle and on both sides of the pulley 24,
Two pulleys 25 and 26 are attached.

A pulley 27 is freely suspended on the shaft 23, and two pulleys 28 .
29 is provided in the book case.

An endless rope 30 is wrapped around these pulleys and several times around pulleys 24 and 27.

When the column 12 is rotated about the shaft 21 by the drive mechanism, the X-ray source 13 and the case 14 move together with the column 12 in opposite directions.

That is, in the figure, when the column is rotated counterclockwise, the X-ray source 13 moves to the left, and at the same time the button case 14 moves to the left.
moves to the right.

At this time, the pulley 24 on the shaft 21 is rotated, and the rope 3
Move 0.

As a result, the stick case 14 is rotated about the shaft 23, clockwise in the figure, and maintained in a horizontal state.

Similarly, when facing the opposite direction of the pillar 12, the butsuki case 1
4 maintains a horizontal state.

In this tomography device, when these columns rotate,
The X-ray scattering prevention grid on the gun case has been moved.

This grid is designated at 31 in FIG.

The grid 31 has guide rollers 32 attached to its both side edges.

The book case 14 is provided with a guide wall 33.

The grid is arranged such that the rollers are in contact with the guide wall and can be moved linearly along the guide wall.

A rope 34 connects the slide 22 and one end of the grid 31.

And, the Butsuki case 14 has two sheaves 35, 3.
6 are provided, and these sheaves change the direction of the rope 34 so that the grid 31 moves linearly along the guide wall as the support column rotates.

A coil spring 37 is disposed between the opposite end of the grid 31 and the gun case to move the grid in a direction opposite to that moved by the rope.

In such a grid moving mechanism, when the support column 12 is rotated around its rotation center axis 21, the rope 34 moves the grid 31 against the coil spring 37, and the support column 12 is rotated in the opposite direction. When the coil spring 37 is connected to the grid 3
1 in the opposite direction, the grid can be moved in synchronization with the rotation of the column.

Figure 3 shows this situation.

The length of the rope 34 is determined in advance so that the grid is located in the middle of the maximum travel distance of the grid when the support 12 is in the neutral position as shown by the solid line.

Now, when the support 12 is rotated counterclockwise around the central rotation axis 21 as shown by the chain line, the rope 34 moves together with the support 12, moves the grid 31, and tensions the coil spring 37. .

As the column is rotated clockwise from the neutral position shown by the solid line, the rope 34 gradually loosens and the grid 31 is moved in the opposite direction by the repulsive force of the coil spring 37, tensioning the rope 34.

In this manner, the grid 31 is reciprocated by the reciprocating rotation of the support column 12, and it is possible to prevent the grid from being captured on the film located below the grid.

FIG. 4 shows another embodiment of the tomography apparatus of the present invention, in which the column is fixed at a neutral position so that the grid can be moved even during fluoroscopic imaging.

This device differs only in part of the grid rocking mechanism.

That is, a pulley 38 is provided on the grid 31, an electric motor 39 is provided on the case, and the rope 3
4 is wound around a pulley 38 and then fixed to a crank plate 40 fixed to the rotating shaft of an electric motor 39.

In a tomography device with such a grid swing mechanism,
As the support column 12 rotates, the stick case 14 can be moved horizontally, and at the same time, the grid 31 can be swung by the rope 34 and the coil spring 37.

Then, when the support column 12 is stopped and normal fluoroscopic imaging is performed, the crank plate 40 is rotated by rotating the electric motor 39, so that the length of the rope 34 can be changed and the grid 31 can be swung. .

As shown in the embodiments described above, the X-ray tomography apparatus of the present invention allows the horizontal movement of the box case and the rocking of the grid to be performed with an extremely simple structure. Sexuality can also be greatly improved.

[Brief Description of the Drawings] Figures 1 to 3 show an embodiment of the X-ray tomography apparatus of the present invention, in which Figure 1 is a front view, and Figure 2 is the structure around the support column and case. FIG. 3 is an explanatory diagram showing the operating state. FIG. 4 is a perspective view showing the structure around the column and case in another embodiment of the X-ray tomography apparatus of the present invention. 11... Base, 12... Pillar, 13.
...X-ray source, 14...Butsuki case, 2
4...First pulley, 25,26...Second pulley, 27...Third pulley, 28,29.
...Fourth pulley, 30...First rope, 31...Grid, 34...Second rope, 35, 36... ...A pulley that changes the direction of the second rope.

Claims (1)

[Claims] 1. A base, a column rotatably provided on the base, an X-ray source and a case mounted on the column with the center of rotation of the column in the middle, and a case that is aligned in a straight line in relation to the rotation of the column. and a means for moving the X-ray scattering prevention grid on the butsuki case in a direction perpendicular to the direction of movement of the support. a first pulley in which the means is located at the center of rotation of the support and rotates together with the support; a pair of second pulleys provided on the base with the first pulley in the middle;
A third pulley located at the center of rotation of the Butsuki case and capable of rotating freely by itself, a pair of fourth pulleys provided on the Butsuki case with the third pulley in the middle, and an endless loop wrapped around each pulley. a first rope connecting the column and the grid, a pulley on the butsuki case that changes the direction of the second rope so that the column moves in one direction when the column rotates, and a pulley on the case that connects the column and the grid; a spring disposed between the grid and the butsuki case so as to move in the direction, the first rope rotates the butsuki case when the column rotates and moves it in a straight line, and the second rope moves the butsuki case in a straight line. An X-ray tomography device characterized by reciprocating with a spring.