DocumentCode :
3328408
Title :
The lofthole: A novel shaped pinhole geometry for optimal detector usage without multiplexing and without additional shielding
Author :
Deprez, Karel ; Van Holen, Roel ; Vandenberghe, Stefaan
Author_Institution :
Dept. of Electron. & Inf. Syst., Ghent Univ.-IBBT-IBiTech, Ghent, Belgium
fYear :
2011
fDate :
23-29 Oct. 2011
Firstpage :
3317
Lastpage :
3322
Abstract :
Multi-pinhole collimator based SPECT systems are nowadays used for pre-clinical and clinical imaging. Overlap of the different projections of the pinholes should generally be avoided. This can be done by either positioning the pinholes far from each other or by using additional shielding. The first method does not allow to use the detector area efficiently while the second method introduces additional cost, weight and design complexity. We investigate a new pinhole geometry, the lofthole, that has a circular aperture but whose entrance and/or exit opening is shaped by the desired irradiated detector area. The lofthole is designed using a ray-tracer and can be manufactured with traditional manufacturing techniques. A lofthole and two regular pinholes have been made in two tungsten-alloy plates. Production of these plates indicates that the manufacturing cost of a pinhole is roughly similar to the manufacturing cost of a lofthole. Measurements on the lofthole and pinhole plates show the rectangular projection of the lofthole versus the circular projection of the pinhole. Penetration measurements indicate that the lofthole has less penetration than a pinhole that irradiates the same detector area.
Keywords :
biomedical equipment; biomedical optical imaging; optical collimators; ray tracing; tungsten alloys; SPECT system; circular aperture; clinical imaging; multi-pinhole collimator; optimal detector usage; penetration measurement; pinhole geometry; ray tracer; tungsten alloy plate; Collimators; Image resolution; Photonics; Single photon emission computed tomography; Collimator; Pinhole; SPECT;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE
Conference_Location :
Valencia
ISSN :
1082-3654
Print_ISBN :
978-1-4673-0118-3
Type :
conf
DOI :
10.1109/NSSMIC.2011.6152599
Filename :
6152599
Link To Document :
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