Objective symmetry detector method for gammaencephalography. I. Physical characteristics.
A symmetry detector method for gammanecephalography is described. It is based on two detectors, collimated by square tubes with large apertures. Increase ratios and side difference ratios should be used as evaluation parameters in clinical applications and are therefore analysed theoretically and experimentally from measurements on a phantom system. The effect of energy discrimination is analyzed and found to be small over a wide range of the lower discrimination level setting. The chosen performance of the measuring routine used made errors caused by the electronic devices negligible in relation to the loss of precision occurring from counting statistics.
D001921:Brain; D005720:Gamma Rays; D006801:Humans; D011834:Radiation Monitoring / Q000379:methods*; D011877:Radionuclide Imaging / Q000379:methods*