RU1804792C - Device for adjusting roentgenographic stand - Google Patents

Abstract

Usage: in medical technology, namely to control the position of the x-ray emitter. The purpose of the invention: improving the accuracy of adjustment. SUMMARY OF THE INVENTION: an apparatus for aligning an X-ray tripod comprises a radiation source, an additional visible light source located on a tripod, a level with a glass ampoule filled with liquid, and an optical system made in the form of a lens, eyepiece and prism, while on the surface the prism and the focal surface of the eyepiece performed mutually perpendicular risks with a center of intersection located on the optical axis of the system, with the prism mounted on one side of the lens, the eyepiece p is on the other, and the level is between the prism and the lens. 1 s.p. f-ly, 3 ill.

Description

The invention relates to medical equipment, more specifically to devices for monitoring the position of an x-ray emitter. Specifically, it is intended to control the verticality of an X-ray tripod column on which a carriage with an X-ray emitter is mounted.

An object of the invention is to improve the alignment accuracy of an X-ray tripod.

In FIG. 1 a, b, c, d shows the proposed device; in FIG. 2 is a section AA in FIG. 1; in FIG. For, b, c, d, d - the image observed through the eyepiece p of the device.

The device for adjusting the x-ray tripod contains a point light source 1, for example, an incandescent lamp mounted in the cartridge 2 on the x-ray emitter 3 (Fig. 1a). The emitter 3 is mounted on the carriage 4 of the column 5 of the X-ray tripod. The second part of the device

is an image forming apparatus. It contains a sighting optical system including a lens 6, a rectangular prism 7 mounted under the lens, and an eyepiece p 8 containing a field 9 and an eye 10 lens. Near the front focal plane of the ophthalmic lens 10 is a plane-parallel glass 11 / with a thin opaque crosshair 12 (Fig. 1,6). The eyepiece 8 can be moved in the tube 13, which is necessary to refocus the optical system. A thin (e.g. 0.1 mm wide) opaque crosshair 15 is applied to the input face 14 of prism 7, the filaments of which cross the diagonals of face 14 (Fig. 1, c). Between the lens 6 and the prism 7 is set round bubble level 31 (Fig. 1, a, d). The level 31 ampoule is made of optical glass and consists of two parts (base 32 and upper part 33) glued together. Lower

with Oh

4 VI O

Yu

the surface of the upper part 33 has a concave shape. The outer end surfaces of the base and the upper part of the level have a flat, mutually parallel surface. The level 31 ampule is filled with liquid 34 with an air bubble 35. The refractive index of the liquid 34 is equal to the refractive index of the optical glass of the level ampoule. On the outer surface of the upper portion 33 of the level ampoule, there is a scale 36 in the form of two concentric circles.

The tube 13 of the optical system is fixed by means of a stand 16 to the carriage 17. With the micrometer screws 18 and 19, the carriage 17 can be moved along the longitudinal 20 and transverse 21 guides. The micrometer screws 18 and 19 are equipped with scales that allow a high degree of accuracy (for example, with an error of not more than 0.005 mm) to measure the displacement of the carriage 17. The base 22 of the carriage is connected by thread to three quotation screws 23 mounted on the stand 24, which is usually placed on deck 25 of the x-ray table. With quotation screws 23, the carriage 17 is brought into a horizontal position at level 26 .;

The device for adjusting the X-ray tripod is used as follows. The image forming device is mounted on deck 2.5 of the horizontal X-ray table so that the point light source 1 is in the field of view of the optical system. The alignment screws 23 at level 26 bring the carriage 17 to the horizontal position . If this operation is performed correctly, the bubble should be in the center of the scale. At the first stage of the tolerance1, a rough adjustment is made according to level 26. Next, the vertical carriage 4 with the x-ray emitter 3 is moved along the column 5 to its highest position and the reading is taken on a scale of 27 (Zi).

When the point light source 1 is turned on, the light wave enters the lens 6 of the image forming apparatus. In this case, the light wave illuminates the crosshair 15, the bubble 35 and the scale 36 of level 31 and is partially obscured by them. The image of source 1 is formed by the lens near the focal plane of the lens. By moving the eyepiece p 8 in the tube 13, the operator directs the sighting tube at the light source 1 in the defocusing mode of the optical system relative to the light source. In this case, the observer sees in the field of view of the optical system illuminated by the source

0

1, the entrance pupil of the lens 28, shaded by a crosshair 29, a bubble 37 and a scale 38 of level 31 (Fig. 3a). In addition, the crosshair 30 of the eyepiece is visible in the field of vision (image cross 12). The center of the crosshair 29 is offset from the center of the crosshair 30 of the eyepiece, which is caused by the mismatch of the optical axis of the sighting tube and the central beam of the light beam of the point source 1. In FIG. 3, and it can also be seen that the level bubble 37 is offset relative to the center of the scale, which is caused by an alignment error. With the 18 and 19 micrometer screws, the operator combines 5 centers of the crosshairs 29 and 30 (Fig. 30 b). Decentration of the vesicle 37 is maintained. Using quotation screws 23, the operator brings the bubble 37 to the center of the scale 38 levels. In this case, a certain shift of the cross 29 relative to the cross 30 will occur. Using the micrometer screws 18 and 19, the operator eliminates this shift until the image shown in Figs. 3c is obtained in the visual field. After that, the operator takes readings from the scales of the micrometer screws 18 and 19 (Ho and Y0). Next, the carriage 4 of the emitter 3 is moved down so that the point light source 1 is approximately 20 cm from the lens 6. On the height scale 27, the Z2 count is taken. As a result of the error in the installation of the column 5 vertically, there will be a displacement of the cross section 29 from the center (Fig. 3, d). With micrometer screws 18 and 19, the operator 5 brings the crosshair 29 to the center (Fig. 3, e), and then takes readings on the scales of these screws X and Y.

The angle of deviation of the COLUMN of the X-ray tripod from the vertical is determined by the following formulas:

X axis: Y axis:

v vV-V arctga ./ arctga °

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Claims (1)

The proposed device for adjusting an X-ray tripod can be widely used both in medical instrument-making enterprises in the manufacture of X-ray diagnostic equipment and in clinics for the repair and commissioning of X-ray devices. SUMMARY OF THE INVENTION 1. An apparatus for adjusting an X-ray tripod containing a radiation source, a level with a glass ampoule filled with liquid to form an air bubble, and an optical system in the form of a lens, characterized in that, in order to improve the accuracy of the adjustment, it is provided with a point source 0 5 0 5 0 5 visible light located on a tripod, and the optical system is additionally equipped with an eyepiece and a prism, moreover, mutually perpendicular risks are performed on the surface of the prism and the focal surface of the eyepiece with a center of intersection placed along the optical axis of the system, while the prism is mounted on one side the lens, the oculus p is on the other, and the level is between the prism and the lens. 2, The device according to claim 1, characterized in that the refractive index of the glass of the level ampoule is equal to the refractive index of the liquid filling it. FIG. 1 b FIG. 1 in FIG. 1 g twenty 35 31 15 Ј KI 19 1 FIG. 2 ЈЖ A - A 23 x P /// Ј 40 I in 3Ј I hours W 23 Ki 1