Single photon scatter compensation by photopeak energy distribution analysis

Author

Logan, K.W. ; McFarland, W.D.

Author_Institution

Missouri Univ., Columbia, MO, USA

Volume

11

Issue

2

fYear

1992

fDate

6/1/1992 12:00:00 AM

Firstpage

161

Lastpage

164

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;

fLanguage

English

Journal_Title

Medical Imaging, IEEE Transactions on

Publisher

ieee

ISSN

0278-0062

Type

jour

DOI

10.1109/42.141639

Filename

141639