Title :
Single photon scatter compensation by photopeak energy distribution analysis
Author :
Logan, K.W. ; McFarland, W.D.
Author_Institution :
Missouri Univ., Columbia, MO, USA
fDate :
6/1/1992 12:00:00 AM
Abstract :
Scattered photons degrade nuclear medicine image contrast and resolution, and preclude simple attenuation corrections. Current scatter correction methods utilize detected events with energies below pulse height analyzer (PHA) window levels, making attenuation corrections source position dependent. This new scatter rejection technique analyzes only the photon signals occurring within the range of standard PHA windows. In real time, at each image location the PHA window energy distribution is analyzed, a scatter fraction determined, and a scatter corrected number of events are output. The method can be adapted to any imaging system which produces event location and energy signals. Attenuation corrections (u=0.15 cm-1, 140 keV) are within 6% for 2-10 cm depths
Keywords :
gamma-ray scattering; radioisotope scanning and imaging; 140 keV; attenuation corrections; image degradation; image resolution; medical diagnostic imaging; nuclear medicine image contrast; photopeak energy distribution analysis; pulse height analyzer window levels; scatter fraction; single photon scatter compensation; source position dependence; Attenuation; Degradation; Electromagnetic scattering; Energy resolution; Event detection; Image resolution; Nuclear medicine; Particle scattering; Signal analysis; Signal resolution;
Journal_Title :
Medical Imaging, IEEE Transactions on