NuclearInsarCLFv s andMethods inPhysLw ResLwT A 527 (2004) 201--205 A full Monte CarlosloCL6TwF of the YAP-PEM prototype for breas tumor detection

A prototype forPosLLTL EmisLTL Mammography, the YAP-PEM,is under development within a collaboration of the ItalianUniversFfifiC ofPisF Ferrara, and Bologna. The aimis to detect breas lessCU withdimensLFC of 5 mm in diameter, and with asLwU:fi activity ratio of 10:1 between the cancer andbreas tissT The YAP-PEMis composC of two sCTxwwCBU detectionheads ,composC of a matrix of 30 # 30 YAP:Ce fingercrysCUx of 2 # 2 # 30 mm each. The EGSnrc Monte Carlo codehas been usn tosCwfiLvfi sCwfiLv characterisU:C of the prototype. Afas EM algorithmhas been adapted toreconsCBw6 all of the collectedlines of flight,als at large incidenceangles by achieving 3D pos:vCBw:v capability of thelesLfi in the FOV. The role of thebreas compresCBw has beensenCFv: The performed serf serf that a 5 mm diameter tumor of 37 kBq/cm (1 m i/cm ), embedded in active breas tiss with 10:1 tumor/ backgroundsackgr activity ratio,is detected in 10 min with aSignal-to-Nois Ratio of 8.771.0. Two hotlesFF: in the active breas phantom are clearly visrly in thereconsFCBwU: image