Performance Evaluation of a Bedside Cardiac SPECT System

This paper reports on the initial performance evaluation of a bedside cardiac PET/SPECT system. The system was designed to move within a hospital to image critically-ill patients, for example, those in intensive care unit (ICU) or emergency room settings, who cannot easily be transported to a conven...

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Bibliographic Details
Published in:	IEEE transactions on nuclear science 2009-06, Vol.56 (3), p.625-632
Main Authors:	Studenski, M.T., Gilland, D.R., Parker, J.G., Hammond, B., Majewski, S., Weisenberger, A.G., Popov, V.
Format:	Article
Language:	eng
Subjects:	511 keV SPECT Cardiac SPECT Counting DETECTION Detectors Emergencies ENERGY RESOLUTION EVALUATION HOSPITALS Image reconstruction Imaging phantoms Measurement METRICS mobile SPECT PATIENTS Performance evaluation PHANTOMS Photonic crystals PHOTONS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Polyethylene terephthalates Position sensitive particle detectors Positron emission tomography SENSITIVITY SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY SPATIAL RESOLUTION Studies
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Summary:	This paper reports on the initial performance evaluation of a bedside cardiac PET/SPECT system. The system was designed to move within a hospital to image critically-ill patients, for example, those in intensive care unit (ICU) or emergency room settings, who cannot easily be transported to a conventional SPECT or PET facility. The system uses two compact (25 cm times 25 cm) detectors with pixilated NaI crystals and position sensitive PMTs. The performance is evaluated for both 140 keV (Tc-99m) and 511 keV (F-18) emitters with the system operating in single photon counting (SPECT) mode. The imaging performance metrics for both 140 keV and 511 keV included intrinsic energy resolution, spatial resolution (intrinsic, system, and reconstructed SPECT), detection sensitivity, count rate capability, and uniformity. Results demonstrated an intrinsic energy resolution of 31% at 140 keV and 23% at 511 keV, a planar intrinsic spatial resolution of 5.6 mm full width half-maximum (FWHM) at 140 keV and 6.3 mm FWHM at 511 keV, and a sensitivity of 4.15 countsmiddotmuCi -1 ldr s -1 at 140 keV and 0.67 counts ldr muCi -1 ldr s -1 at 511 keV. To further the study, a SPECT acquisition using a dynamic cardiac phantom was performed, and the resulting reconstructed images are presented.
ISSN:	0018-9499 1558-1578