Orazio Zoccarato1, Domenico Lizio2, Annarita Savi3, Luca Indovina4, Camilla Scabbio5, Lucia Leva2, Angelo Del Sole5, Claudio Marcassa1, Roberta Matheoud2, Michela Lecchi5, Marco Brambilla6,7. 1. Unit of Nuclear Medicine and Department of Cardiology, S. Maugeri Foundation, IRCCS, Scientific Institute of Veruno, Veruno, NO, Italy. 2. Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy. 3. Department of Nuclear Medicine, Hospital San Raffaele, Milan, Italy. 4. Department of Medical Physics, Polyclinic Agostino Gemelli, Rome, Italy. 5. Department of Health Sciences, University of Milan and Nuclear Medicine Unit, San Paolo Hospital, Milan, Italy. 6. Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy. marco.brambilla@maggioreosp.novara.it. 7. Medical Physics Department, University Hospital of Novara, Novara, Italy. marco.brambilla@maggioreosp.novara.it.
Abstract
BACKGROUND: This investigation used image data generated by an anthropomorphic phantom with a cardiac insert for a comparison between two solid state cameras: D-SPECT and D530c. METHODS: For each camera, two sets (with and without a simulated transmural defect (TD)) of scans were acquired starting from the in vivo standard count statistics in the left ventricle (LV). Other two acquisitions corresponding to 150% and 50% of the reference count statistics were acquired. Five performance indices related to spatial resolution, contrast, and contrast-to-noise ratio (CNR) were analyzed. RESULTS: D-SPECT showed a lower LV wall thickness and an inferior sharpness than D530c. No significant differences were found in terms of contrast between LV wall and the inner cavity, TD contrast or CNR. No significant differences were observed in CNR when moving from the reference level of count statistics down to 50% or up to 150% of the counts acquired on the LV. CONCLUSIONS: Our results show that D-SPECT and D530c have different performances. The lack of differences in the image performance indices along the range of count statistics explored, indicates that there is the possibility for a further reduction in the injected activity and/or the acquisition time, for both systems.
BACKGROUND: This investigation used image data generated by an anthropomorphic phantom with a cardiac insert for a comparison between two solid state cameras: D-SPECT and D530c. METHODS: For each camera, two sets (with and without a simulated transmural defect (TD)) of scans were acquired starting from the in vivo standard count statistics in the left ventricle (LV). Other two acquisitions corresponding to 150% and 50% of the reference count statistics were acquired. Five performance indices related to spatial resolution, contrast, and contrast-to-noise ratio (CNR) were analyzed. RESULTS: D-SPECT showed a lower LV wall thickness and an inferior sharpness than D530c. No significant differences were found in terms of contrast between LV wall and the inner cavity, TD contrast or CNR. No significant differences were observed in CNR when moving from the reference level of count statistics down to 50% or up to 150% of the counts acquired on the LV. CONCLUSIONS: Our results show that D-SPECT and D530c have different performances. The lack of differences in the image performance indices along the range of count statistics explored, indicates that there is the possibility for a further reduction in the injected activity and/or the acquisition time, for both systems.
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