Boots – shoes – and leggings
Patent
1991-05-15
1994-03-08
Envall, Jr., Roy N.
Boots, shoes, and leggings
36441323, 250324, G06F 1500
Patent
active
052931951
ABSTRACT:
Correction for Compton scattering is effected by analysis of the energy spectra. More particularly, a measured energy spectrum is constructed per location from detected counts that are stored according to their measured energy as well as according to the location of gamma ray infingement on a scintillating detector. The measured spectrum comprises scattered and unscattered photons. A physically correct trial function enables the separation of overlapping contributions of scattered and unscattered photons. The trial function includes multiple collision terms that are preferably constructed using the Nishina-Klein equations describing photon Compton scatter probability distributions. The count of unscattered photons per location is derived from the measured spectrum by locally fitting to the trial function. The count of the unscattered photons per location is used to produce the improved images with reduced artifacts caused by Compton scatter.
REFERENCES:
patent: 4780823 (1988-10-01), Stoub et al.
patent: 4839808 (1989-06-01), Koral et al.
B. Axelsson et al., Subtraction of Compton-Scattered Photons in Single-Photon Emission Computerized Tomography, Journal of Nuclear Medicine 25: 490-494, 1984.
Berlad Gideon
Maor Dov
Shrem Yigal
Soil Adrian
Elscint Ltd.
Envall Jr. Roy N.
Tran Khai
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