Half-Time SPECT Myocardial Perfusion Imaging with Attenuation Correction

Reducing acquisition time may improve patient throughput, in-crease camera efficiency, and reduce costs; reducing acquisition timealso increases imagenoise.Newlyavailable softwarecontrols the effects of noise by maximum a posteriori reconstruction while maintaining resolution with resolution-recovery methods. This study compares half-time (HT) gated myocardial SPECT images processed with ordered-subset expectation maximization with resolution recovery (OSEM-RR) (with andwithoutCT-basedatten-uation correction [AC]) with full-time (FT) images obtained with a standardclinical protocol and reconstructedwithfilteredbackpro-jection (FBP) andOSEM(with andwithout AC).Methods:A total of 212 patients (mean age, 57 y; age range, 27–86 y) underwent 1-d rest/stress 99mTc-tetrofosmin gated SPECT. FT (12.5 min, both rest and stress) and HT (rest, 7.5 min; stress, 6.0 min) images were acquired with low-dose CT for AC in 112 patients. HT acqui