Grant Gullberg, PhD Professor Recall UCSF Profile Research Vascular & Cardiac Imaging Publications Quantitative SPECT imaging of 225Ac and its daughters in mice in vivo. Physical phantom validation of clustering-initiated factorization in dynamic PET. A Technique to Quantify Very Low Activities in Regions of Interest With a Collimatorless Detector. A generalization of the maximum likelihood expectation maximization (MLEM) method: Masked-MLEM. Simulation studies of a full-ring, CZT SPECT system for whole-body imaging of 99m Tc and 177 Lu. Accuracy and Reproducibility of Myocardial Blood Flow Quantification by Single Photon Emission Computed Tomography Imaging in Patients With Known or Suspected Coronary Artery Disease. See All Publications