Mark Jason Hamamura1, Seung-Hoon Ha1, Werner W. Roeck1, Orhan Nalcioglu1, Douglas J. Wagenaar2, Dirk Meier2, Bradley E. Patt2
1Tu & Yuen Center for Functional Onco-Imaging, University of California, Irvine, CA, USA; 2Gamma Medica-Ideas Inc., Northridge, CA, USA
In a multimodality MR-SPECT system, a SPECT detector system is placed within the high magnetic field of an MRI system. In this study, we investigated the effects of the Lorentz force on the SPECT measurements. The results revealed a shift in the position of the SPECT projection data that must be taken into account for more accurate image reconstruction. Proper acquisition of the flood field image for sensitivity correction was also found to be critical for accurate image reconstruction.