Boulfelfel D.; Rangayyan R.M.; Hahn L.J.; Kloiber R.; Kuduvalli G.R. 1994). “Restoration of single photon emission computed tomography images by the Kalman filter”. IEEE Transactions on Medical Imaging. 13 (1): 102-109. doi:10.1109/42.276148. Angenent, S.; Pichon, E.; Tannenbaum, A. (2006). “Mathematical strategies in medical imag