Cone beam collimation for single photon emission computed tomography: Analysis, simulation, and image reconstruction using filtered backprojection
作者:
Ronald J. Jaszczak,
Carey E. Floyd,
Stephen H. Manglos,
Kim L. Greer,
R. Edward Coleman,
期刊:
Medical Physics
(WILEY Available online 1998)
卷期:
Volume 13,
issue 4
页码: 484-489
ISSN:0094-2405
年代: 1998
DOI:10.1118/1.595854
出版商: American Association of Physicists in Medicine
数据来源: WILEY
摘要:
This paper presents an analysis of two cone beam configurations (having focal lengths of 40 and 60 cm) for the acquisition of single photon emission computed tomography (SPECT) projection data. A three‐dimensional filtered backprojection algorithm is used to reconstruct SPECT images of cone beam projection data obtained using Monte Carlo simulations. The mathematical analysis resulted in on‐axis point source sensitivities (calculated for a distance of 15 cm from the collimator surface) for cone beam configurations that were 1.4–3 times the sensitivities of parallel‐hole and fan beam geometries having similar geometric resolutions. Cone beam collimation offers the potential for improved sensitivity for SPECT devices using large‐field‐of‐view scintillation cameras.
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