SU683396A1 - Scintillation gamma-chamber - Google Patents

Description

one

The invention relates to medical technology, in particular to gamma cameras - devices for visualizing the distribution of radioactive radiation sources introduced into the body for diagnostic purposes; and will find application in medical, prophylactic and research institutions for the diagnosis of the functional state of the internal organs.

A known scintillation gamma camera containing a detector, a measuring console, an oscilloscope, and a photo recorder 1,

Upon the arrival of a gamma quantum from the test organ, the sensor located in the detecting head generates pairs of electrical signals corresponding to the coordinates of the gamma quantum in relation to the detecting unit in the Cartesian coordinate system and a signal characterizing the energy of the gamma quantum. In the measuring console, the energy and coordinate signals are selected and processed, corresponding to the photopic of the energy of the isotope used. These signals are visualized on an oscilloscope screen. With the help of a photographic recorder, the picture of the distribution of the radioactive indicator in the object is fixed on the photo carrier.

However, in such a camera it is impossible to accurately predict the quality of a photographic image, since it depends both on the oh of the exposure mode, and

0 and from the state of the test organ, which is not known exactly before the test. This may negate the result of the study, for example, when getting too much into the logo or

f too dense photographic image is limited by the size of the CRT screen used in the oscilloscope, which does not allow to obtain in real scale images of large organs such as

0 like liver, lungs, etc .; it is impossible to translate an image into a television standard, which would allow it to be transmitted via a communication line, to multiply it on multiple screens,

5 write to a standard VCR, etc .; it is impossible to consider in more detail the areas of interest, the image scale in the research process; insufficient

0 efficiency of learning, since on. The oscilloscopic screen does not have a complete picture of the distribution of the isotope, and the flash of Blowout are only individual flashes, each of which corresponds to the time and place of arrival of the registered gamma quantum. Also known is a gamma camera, a co-detector, a measuring console, a television monitor, a photographic recorder, a scanning unit including a CRT and a conventional television camera, a memory unit on a magnetic disk. The light flashes from the CRT screen, corresponding to the moment and place at the gamma quanta course, are transferred to the screen of the television camera, from where they are written off after the arrival of the control signal on the magnetic disk and then reproduced on the screen of the television monitor. With the help of the photo recorder, the picture of the distribution of the radioactive indicator in the object is fixed on a photographic film; - But in such a chamber, when the information is converted into a view of my image (on a CRT screen) and then transformed into an electrical form (television camera), it is distorted and sweat. ri, and, consequently, accuracy and reliability decrease; In addition, industrial cameras are not intended to collect and store information for a time longer than the period of personnel sync pulses in the television standard. Over time, there is a decrease in the potential relief of the camera screen (due to leakage currents), i.e., an additional distortion of information. When recording frames to a magnetic disk in a television standard, each individual frame does not have statistical certainty and cannot be used for diagnostic purposes. And also there is no possibility of a detailed consideration of the areas of interest, which would increase the spatial resolution of the gamma camera and increase diagnostic capabilities. The purpose of the invention is to improve the accuracy and reliability of detection of pathological foci of accumulation of a radioactive indicator in an object. This goal is achieved in that the scintillation gamma camera contains a memory tube. (ZELT) signal type with a deflecting system, a scale amplifier, a television sweep generator and a switch, the output of the coordinate signals of the measuring console is connected to the normally closed contact of the first switch, the output of the television sweep generator is connected to the input of the deflection system of the television monitor and the normally open contact of the first switch, the output signal of the measuring console recording is connected to the normally closed contact of the second switch, the signal input of the television The ion monitor is connected to the output of a large-scale amplifier whose input is connected to the normally open contact of the second switch, the deflection system of the ZELT is connected to the moving contact of the first switch, and the cathode to the mobile contact of the second switch. The drawing shows a block diagram of the described scintillation gamma camera. It contains detector 1, measuring console 2, ZELT of type sig3 with deflection system-signal my 4, generator 5 of television sweep, television monitor 6, switches 7 and 8 and scale amplifier 9. The deflecting system of television monitor and photo recorder are not shown in the drawing . Detector 1 generates electrical signals that characterize the energy and coordinates of the incoming g.ma-quantum. The measuring console 2 extracts from the entire radiation spectrum signals with energy corresponding to the photopic of the radiation of the isotope used, and produces X and Y coordinate signals and Z-recording signals. In recording mode, switches 7 and 8 are set to the position shown in the drawing. When the detected gamma quantum from detector 1 is detected, the recording signal is fed through the switch .8 to the ZELT cathode 3 and generates an electron beam, and the deflection system 4 connected via switch 7 to the coordinate output of the console 2 directs the beam to the desired target point ZELT 3. In this way, a potential relief is formed on the ZELT 3 target, corresponding to the distribution of the radioactive indicator in the object. : In read mode, switches 7 and 8 are switched to the opposite state. In this case, the deflecting system 4 of the ZELT 3 is connected via the switch 7 to the television sweep generator 5 connected to the deflection input of the television monitor system 6, and the ZELT cathode via the amplifier 9 to the signal input of the television monitor. The television sweep generator synchronously controls the read beam of the ZELT 3 and the spotlight of the monitor 6. The current of the read beam of the ZELT 3; the amplifier 9 modulates the spotlight of the monitor 6. A picture is displayed on the screen of the monitor 6

Claims (1)

Claim A scintillation gamma camera containing a detector, a measuring console, a television monitor, and a photorecorder, characterized in that, in order to increase the accuracy and reliability of identifying pathological foci of accumulation of a radioactive indicator in an object, it contains a cathode storage electron beam tube (ZELT) of type sig5 nal-signal '' with a deflecting system, a large-scale amplifier, a television scan generator and switches, while the output of the coordinate signals of the measuring console is connected. l to a normally closed the contact of the first switch, the output of the television scan generator is connected to the input of the deflecting system of the television monitor and the normally open contact of the first switch, the output of the recording signal of the measuring console is connected to the normally closed contact of the second switch, the signal input of the television monitor is connected to the output of the scale amplifier, the input of which connected to the normally open contact of the second switch, the deflecting ZELT system is connected to the movable contact of the first comm ator, and the cathode to the movable contact of the second switch.