1.03

A multicenter evaluation of a new post-processing method with depth-dependent collimator resolution applied to full-time and half-time acquisitions without and with simultaneously acquired attenuation correction

“…7 The application to 32 projections was described in prior reports. 8,9 For all attenuation map reconstructions, a uniform initial estimate and 30 iterations of a Bayesian algorithm 7 applied to the downscatter-compensated projection data was used. Truncation compensation for artifacts occurring in the small field of view transmission images as described earlier 10 was applied to the 32-and 64-projection stress-only images.…”

“…When applying attenuation correction, Astonish incorporates an attenuation map-based photopeak scatter correction algorithm in addition to the resolution recovery. 9 Gated images were not attenuation corrected.…”

Multicenter investigation comparing a highly efficient half-time stress-only attenuation correction approach against standard rest-stress Tc-99m SPECT imaging

“…17 The application to 32 projections was described in prior reports. 13,14 For all studies, a uniform initial estimate and 30 iterations were applied to the downscatter compensated projection data. 17 Truncation compensation for any artifacts occurring when the patient's body becomes outside of the small field of view in the transmission images as described earlier 18 was applied to the 32 and 64 projection stress-only images identically.…”

“…When applying attenuation correction, Astonish incorporates an attenuation map-based scatter correction algorithm in addition to the resolution recovery. 14 …”

“…9,12 Preliminary data have demonstrated adequacy of simultaneously acquired line-source transmission maps for attenuation correction using one of these rapid-acquisition protocols (Astonish, Philips, Milpitas, CA). 13,14 To date, reduced acquisition time with new algorithms has not been evaluated with stress-only imaging techniques. Important considerations include image quality, interpretive confidence, diagnostic accuracy, and comparability of extent and severity of defects and quantitative function parameters.…”