SU725656A1 - Apparatus for determining localisation of foreign body - Google Patents

Description

(54) DEVICE FOR DETERMINING LOCALIZATION OF A FOREIGN BODY

one

The invention relates to medical technology, namely to radiography.

A device for determining the localization of a foreign body is known, comprising a base plate and fastening elements 1.

With this device, a double x-ray film was taken on one film. Two images of a foreign body are obtained on the print, which are located at some distance from one another, depending on the depth of the foreign body.

However, the determination of the coordinates by this us-y device is performed with low accuracy and requires complex graphical constructions.

The aim of the invention is to improve the accuracy of determining the coordinates of a foreign body, as well as to simplify graphical constructions in determining the coordinates of a foreign body.

The goal is achieved by the fact that a rectangular groove is made on the base plate of the device, with the possibility of installing a cartridge in it consisting of a lid, base and a film located between them, where there are risks on one side of the lid, and on the other side a coordinate grid of A thin metal wire above the groove is a sheet of X-ray transparent material.

In addition, the device contains a tablet, made in the form of a rectangular

plates, with a coordinate grid on one side and coordinate lines on the other side, on the faces of which reference bars are installed.

FIG. 1 shows a device for determining the localization of a foreign body, top view; ca fig. 2 is a section A-A in FIG. one; in fig. 3 - side of a tablet with a grid of the cassette and a diagram of graphic constructions for determining two coordinates of the position of a foreign body; on

FIG. 4 shows a side of a tablet with a coordinate grid in a vertical plane and a diagram of graphic constructions for determining the depth of a foreign body.

The base plate 1 has a rectangular open groove 2, limited

the contours 3 of the special cassette 4. For the convenience of removing the cassette 4 from the cassette fixture, several protrude from the slot (Fig. 1 and 2). On the outer surface 5 of the upper cover 6 of the cassette 4 there are risks of horizontal coordinate lines 7 and vertical coordinate lines 8, and on the inner surface 9 located directly above the film 10 lying

nT6s: Nb1aNyi cassettes, the reciprocal coordinate grid is applied in the form of a thin metal wire 12 glued into the grooves 11. For the convenience of changing the cassette attached to the human body being examined, the rectangular groove 2 is closed on top by a sheet 13 of X-ray transparent material. In addition, the device contains a tablet 14, made in the form of a rectangular plate, along the edges bordered by reading bars 15 with a coordinate grid formed by lines 7 and 8 of the cassette 4 with a pitch of, for example, 100 X 100 mm. The reverse side of the plate 14 is shown in FIG. four,

The same coordinate vertical lines 16 with stationary reference bars 17 and a movable ruler 18, counting in the opposite direction compared to the fixed one and fixed in the desired position along the reference bar in the vertical direction with a screw 19.

The device is operated as follows.

Install the device on the x-ray table and secured the net, for example, clamps. Using the fastening elements, fix the examined part of the patient's body so that the foreign body, the body gets into the beam of illumination rays. Set the height of the x-ray head in such a way as to ensure that the area with the alien body enters the beam of rays when shooting

of two different points located in

Mesh crossing points on

cassette 4..

The cassette 4 fixed by the film 10 is installed in the device and the images are taken from two points 20 and 21 (Fig. 3). Shooting was done alternately with a shutter speed of 50%.

J of each shot during Shooting on a single film. After the appearance of the gland is applied

on tablet 14, traces 22 of a foreign body. Connect lines 23 and 24 each of the 20 points and 21 points of the survey with the body at a distance of 22, get at the intersection of the direct point 25, the coordinates of which X and Y will be the coordinates of the position of the foreign

bodies.,,,. ;

On the back of the tablet mark the height of the shooting H line 26, Cross 725656

which, with coordinate lines, the distance between them is A (see Figs. 3 and 4) in the direction of the Y axis, gives the survey points 27 and 28 in the vertical plane. Measure the distance AY (see Fig. 3) between

with traces 22 of a foreign body and mark it with points 29 and 30 on the reading ruler on the reverse side of the tablet 14 (see Fig. 4). Connection points 27 and 29; 28 and 30, get straight lines 31 and 32, the intersection of which at point 33 determines the vertical

Z coordinate of the position of the foreign body in the coordinate system of the device.

Taking into account that it is more convenient to measure the depth of the foreign body from above, for example, from any reference point located at height h (see Fig. 4), move the moving reading ruler 18 until the reference point coincides with the value h on the fixed ruler and fix screw 19. Transfer the position of point 33 to the moving reading ruler 18 and along its

the reference scale is used to obtain the depth (h - Z) of the foreign body.

Claims (2)

1. A device for determining the localization of a foreign body, comprising a base plate and fasteners, characterized in that, in order to improve the accuracy of determining the coordinate of the foreign body, A base plate is made of a rectangular groove with the possibility of installing a cassette in it, consisting of a cover, a base and a film located between them, and there are risks on one side of the cover, and on the other side there is a coordinate grid of thin metal wire the groove is set sheet of radiolucent material. 2. The device according to claim 1, characterized in that, in order to simplify graphical 0 constructions in determining the coordinates of a foreign body, it contains a tablet, made in the form of a rectangular plate with a coordinate grid on one side and coordinate lines on the other side, on the edges of which the reading rulers are installed. Source | and information taken into account in the examination 1. Yakhnich I. M. Radiological diagnosis of foreign bodies. M., 1963, p. 76. gz 6 l / T P Phie. 18 // P FIG. 2  2 200 thirty 17 J8