SU39925A1 - Photographic exposure control device - Google Patents

Description

During the work with the photoastrograph, short circuits of the current are sometimes possible due to other random events (for example, liquid getting inside the tube or tearing inside the tube of one of the cords and contacting it with another cord, etc.). A short circuit does not cause very bad consequences for the patient. . In addition, with the most thorough fluoroscopy technique, it is not entirely possible to establish the exact distance of the probe from some parts of the stomach, for which it is necessary to apply some other method as an additional method to the X-ray method.

Finally, to determine the exposure time, you need to know each time the intensity of the light during a flash of the thread, and also to establish that there was a flash inside the stomach.

The proposed preoor makes it possible, with a minimum amount of time, to avoid the above mentioned unpleasantness (short circuit) and, at the same time, to have quite accurate data regarding the luminous intensity of the flash, which allows us to determine when

(S7)

the usual photometer is the density of the films inside the gastrograph, as well as the intensity of light during a flash of the thread and, thus, calculate the distance of the head of the photografgraph from the stomach walls. Knowing the intensity of light with a flash of a thread and comparing the density of a film obtained inside a photo-gastrograph with the density of a layer of a film with the direct action of a flash of a thread, you can make all the necessary definitions.

In the proposed schematic drawing of FIG. 1 shows a general external view of the proposed device; FIG. 2- internal device of the camera; FIG. 3 and 4-piece connector device; FIG. 5-schematic diagram of the inclusion of the device and photoastrograph in the circuit of the electric current.

The proposed device consists of a wooden chamber with an opening in the rear wall, against which cassette 2 with a cover 3 is installed. A film or a photosensitive plate is inserted into the cassette. Inside the camera 1, on the front and on the back walls of it, brackets 4 and 5 are fixed, on which a tandem 6 is suspended, which before taking pictures was held in the 7 position set aside with the aid of a lufivo lower end, jogged inside the chamber Through slots 11 ring 8, p 5 fixed to the lower end of the elbow; outside the side wall of the chamber 1 of the rod 9, which is under the action of the coil spring 10, pulling it up. At the upper end of the rod 9 there is a button for crushing it downwards.

On the front wall of the device installed supply, 1 eiiiUiH. the cover of a cylindrical tube 14a, inside of which is placed a device for a flash, similar to a boglufhotogastrograph, in the form of a connector, consisting of a dielectric block 14, placed mei; a two-sided column 15, 1o, equipped with screws 17, 18 d.1 fixing a tungsten filament of Navi-14 to a bar. The thread is connected in series with the filament transformer of the photogastrograph and with the photogographer itself and includes 3 electric current circuits simultaneously with the photogastrograph thread by means of a double switch.

In one of the lower corners of the front wall of chamber 1, a window 20 is located to approach the master 6.

By charging the apparatus with a film in a photographic room and fortifying the tungsten-ofi-filament yarn in the connector through the opening 20, the hand draws away the hand 6 to the side, n;) the right end of it is inserted into the ring 8 of the rod 9 and reinforces a black cardboard sheet on it. The apparatus is transferred to an x-ray room, where it is placed behind the protective chair to protect the film from the effects of; tgens rays.

After inserting the photoastrograph probe into the patient's stomach, the electrical wires of the latter are connected to contacts 22 and 23 with the bipolar knife switch 25 on (Fig. 5). When the patient with the stomach swollen under fluoroscopy control is brought into the proper position, the X-ray tube is turned on and, pressing the button 13, the master 6 is released and the switch is turned on at the same time 25. One time flash flashes.

 inside photogastrog, -i inside the device; at the same time I take 1 from the photo-program inside the udia and the swing of the tandem, which makes it possible to determine the 11th Vol:: telp and flash intensity according to the print n; a film in the form of a sharp or smeared strip from the slit in 11crystal; yu to the tatu black paper 31.

With the help of a photometer, the density of the negative is determined, which can be compared to the density of the negative obtained by illumination with any other source of light.

The study of all films makes it possible to express the intensity of the flash in lux, determine the density of films captured in the photo-gastrograph, and calculate the distance of the head from all the walls of the stomach, i.e., determine all those distances that could not be determined by radiograph, based on what data can determine the size of the folds of the stomach.

The thread burning in the connector at the same time serves as a reliable fuse, preventing a continuous flash of the thread in the photoastrograph, protects the device and the patient from any troubles that may arise from a short circuit or equipment malfunction.

Prilmet invention.

P, 1 to control the exposures in photo imaging, characterized in that it consists of a camera 3 connected to the photographic cassette 2, inside which is placed a screen 6 opposite to the photosensitive plate with a slit 6, which can be fixed in the 7 position set aside using a locking device 8, 9, 10 located outside the chamber, on the front wall of which a cylindrical tube 14a is installed opposite the tambourine, comprising a connector located in front of the tomb screen 31 of a conductive removably fastened to a conductive two poster 15, 16 the insulating wedges. 14 for winding a tungsten filament connected by 3 KTpv 4ecKH, optionally, a sequence. about or in parallel, with the lighting fixture located in the head of the photo-gastrograph.