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Titolo:
A COMBINED HALF-CONE BEAM AND PARALLEL HOLE COLLIMATION SYSTEM FOR SPECT BRAIN IMAGING
Autore:
STONE CD; SMITH MF; GREER KL; JASZCZAK RJ;
Indirizzi:
NIH,DEPT NUCL MED,BLDG 10,ROOM 1C401,10 CTR DR BETHESDA MD 20892 DUKE UNIV,MED CTR,DEPT RADIOL DURHAM NC 27710
Titolo Testata:
IEEE transactions on nuclear science
fascicolo: 3, volume: 45, anno: 1998,
parte:, 2
pagine: 1219 - 1224
SICI:
0018-9499(1998)45:3<1219:ACHBAP>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAXIMUM-LIKELIHOOD RECONSTRUCTION; EMISSION-COMPUTED-TOMOGRAPHY; FILTERED BACKPROJECTION; ORDERED SUBSETS; ALGORITHM; PROJECTIONS; CT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
C.D. Stone et al., "A COMBINED HALF-CONE BEAM AND PARALLEL HOLE COLLIMATION SYSTEM FOR SPECT BRAIN IMAGING", IEEE transactions on nuclear science, 45(3), 1998, pp. 1219-1224

Abstract

Our research group has recently examined new types of collimator designs with the goal of improving sensitivity and lesion detection for head imaging. One of these collimator designs is a half-cone beam collimator. However, the sensitivity is reduced as objects are removed from the focal line and it does not satisfy Tuy's sufficiency condition. Parallel hole collimation does not have this problem with axial blurring, however, values for sensitivity are not as large as for half-cone collimators. A potential configuration is to use one parallel hole collimator in conjunction with two half-cone beam collimators on a triple camera single photon emission computed tomography (SPECT) system. This might produce results that represent the best of both collimation systems. We acquired projection data with a Defrise disk phantom filled with Tc-99m. A half-cone beam collimator with a focal length of 50 cm was placed on one head of a triple camera SPECT system. A low energy super high resolution (LESR) parallel hole collimator was placed on a second head. Different projection data sets were combined to model acquisition in the three headed gamma camera with three half-cone beam collimators, two half-cone beam and one parallel beam collimators, one half-cone beam and two parallel beam collimators and three parallel beam collimators. Image reconstruction used a modified maximum likelihood maximization-expectation (ML-EM) algorithm. For the reconstruction with three half-cone beam collimators, we observe axial blurring. This is largely reduced with two half-cone beam and one parallel beam collimators. Graphs of the image profiles demonstrate that the blurring along the axial direction is decreased with the addition of parallel hole collimators.

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Documento generato il 09/04/20 alle ore 07:50:33