SU1436993A1 - Method of segmental tomography and cassette for effecting same - Google Patents

Abstract

The invention relates to medical technology, namely to radiology. In order to improve the quality of segmented tomography and increase the informativity of segmental tomograms, when examining round objects by close contact of the object with a flexible cassette and aligning the swing axis of the planigraph with the central axis of the object under study, conditions are created for the beam to fall across the film throughout the entire survey. In addition, the device containing a flexible radiation receiver is equipped with four movable telescopic supports, which serve to create intimate contact of the cassette with the object, and are provided with scales measuring the curvature radius of the cassette plane with a rounded object, the height of the swing axis being equal to the radius. 2 sec. f-ly, 1 ill. (L

Description

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The invention relates to medicine, in particular to radiography, and is intended for the segment tomography of rounded objects.

The purpose of the invention is to improve the quality of segmentograms by perpendicularly dropping an x-ray beam onto the bar at each position of the radiation source and reducing the time for C1 & n research by using a cassette for segmental tomography.

The drawing shows a cassette for segmental tomography.

The method of segmental tomography involves irradiating a stationary object of study with a linearly moving radiation source equipped with a slit diaphragm, setting the height of the swing axis of the planigraph to be equal to the average radius of the object under study and aligned with the center of curvature of the object under study, and registering the radiation passing through the object of study with a fixed receiver radiation, closely adjacent to the object of study.

A cassette for segmental tomography contains a flexible envelope 1 made of opaque and easily washable material, on the upper surface of which a median mark is applied (crossing of the axes). X-ray film 2 and reinforcing screens 3 are inserted into the cassette. Valve 4 of envelope 1 can be fixed on the bottom surface of envelope 1. Four corners of flexible envelope 1 are fixed to telescopic supports 5, which are equipped with return springs 6 and have measuring scales 7. Each support 5 is installed based on 8 with the ability to change the angle of inclination.

A segmental tomography method using a segmental tomography cassette is performed as follows.

On the tube of the planigraph, lead plates restrict a slit perpendicular to the direction of movement of the radiator with a width of 1 to 10 mm (depending on the thickness of the layer to be separated).

An x-ray emitter is installed with the orientation of the central beam perpendicular to the deck of the table on which the cassette is placed so that its middle mark is aligned with the central beam. The center of the studied area of the patient's body is located at the median mark of the cassette. Upon contact with a rounded object, a flexible envelope 1 with an X-ray film 2 fits it tightly. This leads to a change in the length of the telescopic supports 5, which uniquely depends on the radius of curvature

0 plane of the cassette. The radii of the object under study are determined by the four measuring chambers 7. The height of the axis of the swing planigraph set equal to the average value

5 of the radius of the object of study and combined with the center of curvature of the object of study. The object under study is irradiated by a linear motion of the radiation source, while the object of study and the radiation receiver are stationary.

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Claims (2)

1. A method of segmental tomography, including the irradiation of a stationary object of research by a linearly moving radiation source equipped with a slit diaphragm, and the recording of radiation transmitted through the object of study by a fixed radiation receiver, characterized in that, in order to improve the quality of the segmentotommrams due to perpendicular X-ray incidence the beam to the film at each position of the radiation source, the height of the swing axis of the planigraph is set equal to the average radius of the object ani and Sovmen schayut with the center of curvature of the study object, wherein the radiation receiver tight to the study object. 2. A cassette for segmental tomography containing a flexible envelope with X-ray film and reinforcing screens, characterized in that, in order to shorten the examination time, the angles of the flexible envelope are fixed on telescopic supports equipped with measuring scales and installed on the base with the possibility of changing the angle of inclination. five / 6