Unified deadtime correction model for PET

Author

Daube-Witherspoon, Margaret E. ; Carson, Richard E.

Author_Institution

Dept. of Nucl. Med., Nat. Inst. of Health, Bethesda, MD, USA

Volume

10

Issue

3

fYear

1991

fDate

9/1/1991 12:00:00 AM

Firstpage

267

Lastpage

275

Abstract

A model of deadtime for emission and transmission scans in positron emission tomography (PET) scanners with two-dimensional detectors has been developed. The model takes into account coincidence losses due to singles losses and multiple events, as well as mispositioning errors at higher count rates caused by pulse pile-up, within a detector block. The model is applicable to emission distributions and to spatially varying singles distributions seen with a rotating pin transmission source. An automatic procedure to determine the parameters of this model based on decaying emission studies has also been developed. Different singles dead time factors are required for emission and blank distributions due to differences in their energy spectra. The model was tested on emission and pin transmission data taken on the Scanditronix PC2048-15B scanner

Keywords

computerised tomography; modelling; radioisotope scanning and imaging; Scanditronix PC2048-15B scanner; automatic procedure; coincidence losses; detector block; emission scans; energy spectra; medical diagnostic imaging; mispositioning errors; multiple events; nuclear medicine; positron emission tomography; pulse pile-up; rotating pin transmission source; singles losses; transmission scans; unified deadtime correction model; Attenuation; Calibration; Cities and towns; Contamination; Detectors; Event detection; Nuclear and plasma sciences; Nuclear medicine; Positron emission tomography; Testing;

fLanguage

English

Journal_Title

Medical Imaging, IEEE Transactions on

Publisher

ieee

ISSN

0278-0062

Type

jour

DOI

10.1109/42.97575

Filename

97575