4
GE Healthcare Evolution for Cardiac Evolution for Cardiac with Infinia ™ Hawkeye ™ cuts scan time Dr. Tarik Belhocine Associate Director of Clinical Research London Health Sciences Centre Department of Nuclear Medicine London, Ontario, Canada Overview Evolution for Cardiac is an innovative SPECT reconstruction package for both gated and non-gated Tc-99m based myocardial perfusion imaging (MPI). This package improves image quality while reducing imaging time by up to 50 percent * . This method can be used with or without Hawkeye CT-based attenuation correction, providing corrections for image-degrading factors including photon scatter, soft tissue attenuation and collimator detector response. Image quality is clinically equivalent to that of the FBP/OSEM full time acquisition. Methods MPI studies were performed with a two-day gated rest-stress Tc-99m MIBI protocol, on an Infinia Hawkeye SPECT/CT system, using Evolution for Cardiac for reconstruction. This iterative reconstruction (IR) method incorporates collimator detector response correction for resolution recovery (RR), attenuation correction (AC) and scatter correction (SC). The half-time acquisition (10 sec/proj) processed wtih RR, AC and SC was compared to full-time acquisition (20 sec/proj) routinely processed with FBP and IRAC reconstruction methods. The stress test was performed with Dipyridamole plus cycling exercise. Patient A History A 68 year-old male with an intermediate pretest likelihood of CAD was referred for a pre-surgical workup. BMI = 31.3. Patient A Findings A definitely normal study. * For complete product details refer to the Evolution for Cardiac product data sheet (5240720HNF, version 6/2007) Patient A - Evolution for Cardiac with corrections for soft tissue attenuation, photon scatter and collimator detector response, applied to a 10-second projection study.
