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Titolo:
A COMPARISON OF 180-DEGREES AND 360-DEGREES ACQUISITION FOR ATTENUATION-COMPENSATED TL-201 SPECT IMAGES
Autore:
LACROIX KJ; TSUI BMW; HASEGAWA BH;
Indirizzi:
UNIV N CAROLINA,DEPT BIOMED ENGN,CB 7575,152 MACNIDER CHAPEL HILL NC 27599 UNIV N CAROLINA,DEPT RADIOL CHAPEL HILL NC 00000 UNIV CALIF SAN FRANCISCO,BIOENGN GRAD GRP SAN FRANCISCO CA 94143 UNIV CALIF SAN FRANCISCO,DEPT RADIOL SAN FRANCISCO CA 94143
Titolo Testata:
The Journal of nuclear medicine
fascicolo: 3, volume: 39, anno: 1998,
pagine: 562 - 574
SICI:
0161-5505(1998)39:3<562:ACO1A3>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
EMISSION TOMOGRAPHY; DATA-COLLECTION; RECONSTRUCTION; TL-201;
Keywords:
SPECT; ATTENUATION COMPENSATION; TL-201 PERFUSION AGENTS; CARDIAC SIMULATION STUDY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
K.J. Lacroix et al., "A COMPARISON OF 180-DEGREES AND 360-DEGREES ACQUISITION FOR ATTENUATION-COMPENSATED TL-201 SPECT IMAGES", The Journal of nuclear medicine, 39(3), 1998, pp. 562-574

Abstract

This study compared attenuation compensated, myocardial SPECT images reconstructed from 180 degrees and 360 degrees data to determine if either data acquisition method might yield improved image quality. Specifically, this study analyzed how the use of either 180 degrees or 360 degrees data affects: (a) the relative count density distribution, (b)defect contrast and (c) level of statistical noise in the left ventricular (LV) wall in the reconstructed SPECT images, Methods: Using the three-dimensional MCAT phantom simulating (TI)-T-201 uptake in the upper torso and the SIMSET Monte Carlo code, noise-free projection datasets for both 180 degrees (45 degrees LPO to 45 degrees RAG) and 360 degrees acquisition were generated with the effects of nonuniform attenuation, collimator-detector response and scatter. In addition, low-noiseexperimental phantom data were acquired over 180 degrees and 360 degrees. Assuming the same total acquisition time, four sets of noisy projection data were simulated from scaled noise-free, simulated data for the following acquisitions: (a) 180 degrees and (b) 360 degrees data acquired on a 90 degrees dual-detector system and (c) 180 degrees and (d) 360 degrees data acquired on a 120 degrees triple-detector system. For each of the four acquisition schemes, 400 realizations of noisy projection data were generated, and the normalized s.d. in the reconstructed images was calculated for five ROIs in the LV wall. Images were reconstructed with nonuniform attenuation compensation using ML-EM algorithm for 25, 50 and 75 iterations. Results: Both the simulated noise-free and experimental low-noise images reconstructed from 180 degrees and 360 degrees data showed nearly identical count densities and defect contrasts in the LV wall, For the 90 degrees dual-detector system, 180 degrees images showed less noise, while for the 120 degrees triple-detector system, 360 degrees showed less noise; however, these differences in noise level were extremely small after a smoothing filter was applied. The 180 degrees images acquired with the 90 degrees dual-detector system showed the same noise level as the 360 degrees images acquired with the 120 degrees triple-detector system, so neither system geometry had an advantage with respect to reduced noise in the SPECT images. Conclusion: When nonuniform attenuation compensation is included in the reconstruction, the count density in the LV wall is nearly identical for 180 degrees and 360 degrees SPECT images, and the 90 degreesdual-detector and 120 degrees triple-detector SPECT systems produced similar SPECT images for the same total acquisition time.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/01/20 alle ore 10:54:30