Validation of an iterative reconstruction for a mobile tomographic gamma camera system—The Cardiotom

The Cardiotom is a mobile gamma camera that uses ectomography, an alternative method of acquisition to SPECT. It is designed for early diagnosis of myocardial and cerebral infarctions in the emergency room. Ectomography is a limited view angle method, using a rotating slant hole collimator and a stationary camera head, to acquire projection images. The aim of this work was to validate a fully 3D ML–EM iterative reconstruction algorithm for the Cardiotom. tion measurements were performed with 99mTc point sources. Resolution in the reconstructed volume was determined in X, Y, and Z directions from the point spread functions. The results were compared with the values for the formerly used filtered back projection (FBP). w reconstruction algorithm provides greatly improved depth resolution with respect to the FBP method previously implemented on the Cardiotom. Furthermore, for clinical examinations, images can be available for interpretation within 15 min of the injection, therefore, valuable information can be obtained without delaying treatment of the patient.