Investigation of gamma camera detector uniformity using a dynamic line phantom
Abstract
Methods: Count rate - activity and uniformity - count rate functions were determined by the dynamic line phantom on three circular field-of-view gamma cameras with 37 PMTs, on one circular field of view camera with 19 PMTs, and on one rectangular field-of view gamma camera with 59 PMTs, with and without a collimator. For an evaluation of the efficacy of the dynamic line phantom, the results were compared with the uniformity values obtained with a 99mTc point source and a 57-Co sheet source.
Results: In the optimum count rate range (20,000-30,000 cps for a circular field-of-view, 15,000-65,000 cps for a rectangular field-of-view) determined individually for each gamma camera, the uniformity values obtained with the dynamic line phantom did not differ statistically from the re fined with the 99mTc point source or the 57-Co sheet source.
Conclusions: The dynamic line phantom is suitable for the determination of detector uniformity, but the measurements should be performed within a well-defined activity (count rate) interval.
Abstract
Methods: Count rate - activity and uniformity - count rate functions were determined by the dynamic line phantom on three circular field-of-view gamma cameras with 37 PMTs, on one circular field of view camera with 19 PMTs, and on one rectangular field-of view gamma camera with 59 PMTs, with and without a collimator. For an evaluation of the efficacy of the dynamic line phantom, the results were compared with the uniformity values obtained with a 99mTc point source and a 57-Co sheet source.
Results: In the optimum count rate range (20,000-30,000 cps for a circular field-of-view, 15,000-65,000 cps for a rectangular field-of-view) determined individually for each gamma camera, the uniformity values obtained with the dynamic line phantom did not differ statistically from the re fined with the 99mTc point source or the 57-Co sheet source.
Conclusions: The dynamic line phantom is suitable for the determination of detector uniformity, but the measurements should be performed within a well-defined activity (count rate) interval.
Keywords
gamma camera; quality control; dynamic line phantom
Title
Investigation of gamma camera detector uniformity using a dynamic line phantom
Journal
Issue
Article type
Research paper
Pages
41-45
Published online
2000-02-10
Page views
559
Bibliographic record
Nucl. Med. Rev 1998;1(1):41-45.
Keywords
gamma camera
quality control
dynamic line phantom
Authors
Teréz Séra
János Mester
Lászlo Csernay
Lászlo Pávics