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Titolo:
EFFECT OF TRUNCATED PROJECTIONS ON DEFECT DETECTION IN ATTENUATION-COMPENSATED FANBEAM CARDIAC SPECT
Autore:
GREGORIOU GK; TSUI BMW; GULLBERG GT;
Indirizzi:
UNIV N CAROLINA,DEPT BIOMED ENGN,CB 7575,152 MACNIDER HALL CHAPEL HILL NC 27599 UNIV N CAROLINA,DEPT BIOMED ENGN CHAPEL HILL NC 27599 UNIV N CAROLINA,DEPT RADIOL CHAPEL HILL NC 27599 UNIV UTAH,DEPT RADIOL SALT LAKE CITY UT 84132
Titolo Testata:
The Journal of nuclear medicine
fascicolo: 1, volume: 39, anno: 1998,
pagine: 166 - 175
SICI:
0161-5505(1998)39:1<166:EOTPOD>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
EMISSION COMPUTED-TOMOGRAPHY; COLLIMATED LINE SOURCE; CONE-BEAM; TRANSMISSION CT; RECONSTRUCTION; ALGORITHMS; ROC; TL-201; TC-99M; DESIGN;
Keywords:
FANBEAM MYOCARDIAL SPECT; TRUNCATED PROJECTION; OBSERVER PERFORMANCE STUDY; RECEIVER OPERATING CHARACTERISTICS STUDY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
G.K. Gregoriou et al., "EFFECT OF TRUNCATED PROJECTIONS ON DEFECT DETECTION IN ATTENUATION-COMPENSATED FANBEAM CARDIAC SPECT", The Journal of nuclear medicine, 39(1), 1998, pp. 166-175

Abstract

For some camera systems used in cardiac SPECT, the limited field of view of fanbeam-collimated detectors produces truncation in the projection data. This truncation may generate artifacts and distortions in the transmission CT images and in the attenuation-corrected myocardial SPECT images (that use the transmission CT images as attenuation maps),thus affecting clinical diagnosis. Concern over this problem stimulated us to evaluate the effect of truncation with human observer performance studies, Methods: A three-dimensional mathematical cardiac-torso phantom that realistically models the attenuation and (TI)-T-201 uptake distributions in different organs of the upper torso was used for the investigation. Five degrees of truncation (from 0% to 40% truncation) in the projection data were simulated by the use of five different detector sizes collimated by fanbeam collimators, The attenuation maps were obtained by reconstructing the truncated transmission data generated from these fanbeam geometries. The emission data obtained with thesame fanbeam geometries were reconstructed by using the maximum likelihood-expectation maximization algorithm and were corrected for attenuation using the reconstructed attenuation maps, Two observer performance studies were performed, In Study 1, the images were reconstructed without using the body contour as support, whereas in Study 2, the exact body contour was used in reconstructing both the attenuation maps and the attenuation corrected SPECT images, Results: The results of the receiver operating characteristics analysis indicate that there is very little difference between detection for the various degrees of truncation, and this difference only becomes noticeable for severe truncation of greater than 40%, Conclusion: Using the acquisition and processing methods, we found the use of the body contour as support in reconstructing truncated transmission CT and SPECT data reduces the loss of defect detectability in attenuation-compensated myocardial SPECT imagesdue to truncated data.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 12:17:12