Truncation reduction in fan-beam transmission scanning using the radon transform consistency conditions

Transmission scanning is needed for accurate attenuation correction in card iac Single Photon Emission Tomography (SPET). Simultaneous emission and tra nsmission imaging can be done using a scintillation camera with a fan-beam collimator and a line source at the focal point. The transmission data will be truncated, however, which may lead to inaccuracy in the reconstructed e mission values. We have developed two different methods for augmentation of truncated transmission data, based on the Radon transform consistency cond itions. Our results show that the uniformity in the myocardium can be impro ved with these methods, as compared to using the truncated data directly in the reconstruction.