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Linearity correction device for a scintillation camera

Patent:

Abstract

This invention concerns the scintillation cameras still called gamma ray camera. The invention particularly covers the improvement in the resolution and the uniformity of these cameras. Briefly, in the linearity correction device of the invention, the sum is made of the voltage signals of different amplitudes produced by the preamplifiers of all the photomultiplier tubes and the signal obtained is employed to generate bias voltages which represent predetermined percentages of the sum signal. In one design mode, pairs of transistors are blocked when the output signal of the corresponding preamplifier is under a certain point on its gain curve. When the summation of the energies of a given scintillation exceeds this level which corresponds to a first percentage of the total signal, the first transistor of each pair of each line is unblocked, thereby modifying the gain and curve slop. When the total energy of an event exceeds the next preset level, the second transistor is unblocked to alter the shape again, so much so that the curve shows two break points. If needs be, the device can be designed so as to obtain more break points for the increasingly higher levels of energy. Once the signals have been processed  More>>
Authors:
Publication Date:
Jun 16, 1978
Product Type:
Patent
Report Number:
FR 2395514; A
Reference Number:
AIX-11-511443; EDB-80-079090
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; GAMMA CAMERAS; RESOLUTION; SCINTILLATION COUNTERS; CAMERAS; MEASURING INSTRUMENTS; RADIATION DETECTORS; 440103* - Radiation Instrumentation- Nuclear Spectroscopic Instrumentation
OSTI ID:
5438808
Country of Origin:
France
Language:
French
Submitting Site:
INIS
Size:
Pages: 23
Announcement Date:
May 01, 1980

Patent:

Citation Formats

Lange, Kai. Linearity correction device for a scintillation camera. France: N. p., 1978. Web.
Lange, Kai. Linearity correction device for a scintillation camera. France.
Lange, Kai. 1978. "Linearity correction device for a scintillation camera." France.
@misc{etde_5438808,
title = {Linearity correction device for a scintillation camera}
author = {Lange, Kai}
abstractNote = {This invention concerns the scintillation cameras still called gamma ray camera. The invention particularly covers the improvement in the resolution and the uniformity of these cameras. Briefly, in the linearity correction device of the invention, the sum is made of the voltage signals of different amplitudes produced by the preamplifiers of all the photomultiplier tubes and the signal obtained is employed to generate bias voltages which represent predetermined percentages of the sum signal. In one design mode, pairs of transistors are blocked when the output signal of the corresponding preamplifier is under a certain point on its gain curve. When the summation of the energies of a given scintillation exceeds this level which corresponds to a first percentage of the total signal, the first transistor of each pair of each line is unblocked, thereby modifying the gain and curve slop. When the total energy of an event exceeds the next preset level, the second transistor is unblocked to alter the shape again, so much so that the curve shows two break points. If needs be, the device can be designed so as to obtain more break points for the increasingly higher levels of energy. Once the signals have been processed as described above, they may be used for calculating the co-ordinates of the scintillation by one of the conventional methods.}
place = {France}
year = {1978}
month = {Jun}
}