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Titolo:
Transmission CT reconstruction for offset fan beam collimation
Autore:
Gilland, DR; Jaszczak, RJ; Coleman, RE;
Indirizzi:
Duke Univ, Med Ctr, Dept Radiol, Durham, NC 27710 USA Duke Univ Durham NCUSA 27710 Med Ctr, Dept Radiol, Durham, NC 27710 USA
Titolo Testata:
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
fascicolo: 4, volume: 47, anno: 2000,
parte:, 2
pagine: 1602 - 1606
SICI:
0018-9499(200008)47:4<1602:TCRFOF>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORDERED SUBSETS; ALGORITHMS; TOMOGRAPHY; EMISSION; CAMERA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Gilland, DR Duke Univ, Med Ctr, Dept Radiol, Durham, NC 27710 USA Duke Univ Durham NC USA 27710 pt Radiol, Durham, NC 27710 USA
Citazione:
D.R. Gilland et al., "Transmission CT reconstruction for offset fan beam collimation", IEEE NUCL S, 47(4), 2000, pp. 1602-1606

Abstract

Offset fan beam collimation has shown to be an effective means of obtaining transmission CIT (TCT) data for SPECT attenuation correction. This paper compared three methods for handling the truncation problem and reconstructing this TCT data: iterative OS-EM and filtered backprojection (FBP) with two different pre-processing approaches. The first approach (FBP1) extends the fan beam projection by sinogam interpolation, and the second (FBP) uses parallel beam rebinning. With a TCT spatial resolution phantom, FBP2 demonstrated a small degree of resolution loss which was equalized across methods after post-reconstruction filtering. With a thorax phantom, all methods performed adequately at high count level; however, at low count level, FBP1 showed degraded image quality due to its handling of zero count projection bins. This finding was corroborated in patient images. We conclude that at practical count levels, the iterative OS-EM method offers a clear advantage in TCT image quality compared to FBP methods.

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Documento generato il 05/04/20 alle ore 19:30:58