By National Council on Radiation Protection and Measurements
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Additional info for Nuclear Medicine-Factors Influencing the Choice & Use of Radionuclics in Diagnosis & Therapy (NCRP report)
Fortunately, the modulation transfer function can be expressed rather simply as the normalized Fourier transform of a line source response function and is sensitive to the shape of the entire function, not just its width. This more general measure of spatial resolution of an imaging system can be computed from the measured response curve to a line source. An example of line source response functions for a small high resolution focused collimator is shown in Figure 7 along with the measured MTF(v) curves.
3) System with Combined Paralyzable and Non-Paralyzable Detectors. Anger-type scintillation cameras are prone to both types of dead time losses. The maximum count rate a t which these systems perform adequately has been increased almost ten-fold in recent years. Above a maximum count rate, several factors are encountered that strongly influence image quality. First, the spatial resolution becomes degraded and then, at somewhat higher count rates, spurious images 46 / 3. CHOOSING AN INSTRUMENT FOR NUCLEAR MEDICINE are obtained.
Figure 4 illustrates how energy resolution (percent) varies with incident gamma-ray energy for a '' For scintillation detectors, this is the number of photoelectrons collected at the first dynode of the photomultiplier tube per gamma ray detected. For semiconductor detectors, this is the number of electron-hole pairs collected per gamma ray detected. 4 DETECTORS FOR MEASUREMENT AND IMAGING / 41 Gamma-Ray Energy (MeV) Fig. 4. Plot of detector resolution (RE)as a function of gamma-ray energy (Heath, 1964).
Nuclear Medicine-Factors Influencing the Choice & Use of Radionuclics in Diagnosis & Therapy (NCRP report) by National Council on Radiation Protection and Measurements