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Multidivergent‐beam stationary cardiac SPECT
Author(s) -
Zeng Gengsheng L.,
Stevens Andrew M.
Publication year - 2009
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.3134245
Subject(s) - collimator , pinhole (optics) , collimated light , sensitivity (control systems) , optics , image resolution , physics , single photon emission computed tomography , resolution (logic) , spect imaging , beam (structure) , computer science , computer vision , artificial intelligence , nuclear medicine , engineering , electronic engineering , medicine , laser
This article develops a stationary cardiac single photon emission computed tomography (SPECT) system using a novel multidivergent‐beam collimator. This stationary SPECT system is inexpensive to build, small, and able to acquire true dynamic SPECT data. Stationary cardiac SPECT systems with multipinhole technology already exist. The proposed approach is to replace the multipinhole collimators with the originally designed multidivergent‐beam collimators. The motivation for replacing the pinhole technology by divergent‐beam technology is based on the following facts. The resolution/sensitivity trade‐off for the pinhole is excellent (good resolution and good sensitivity) only in small object (e.g., small animal) imaging when it operates in the image magnifying mode. However, in large object (e.g., human) imaging, the resolution/sensitivity trade‐off is poor (poor resolution and poor sensitivity) when the pinhole operates in the image reducing mode. In a stationary system, the number of angular views is limited; thus, image reduction is necessary to obtain more view angles. In this image reducing situation, divergent‐beam collimation is able to provide better resolution and detection sensitivity than pinhole collimation. Computer simulations are carried out to verified the claims.