Development of the LBNL positron emission mammography camera

We present the construction status of the LBNL positron emission mammography (PEM) camera, which utilizes a positron emission tomography (PET) detector module with depth of interaction measurement consisting of 64 LSO crystals (3/spl times/3/spl times/30mm/sup 3/) coupled on one end to a single photomultiplier tube (PMT) and on the opposite end to a 64 pixel array of silicon photodiodes (PDs). The PMT provides an accurate timing pulse, the PDs identify the crystal of interaction, the sum provides a total energy signal, and the PD/(PD+PMT) ratio determines the depth of interaction. We have completed construction of all 42 PEM detector modules. All data acquisition electronics have been completed, fully tested and loaded onto the gantry. We have demonstrated that all functions of the custom IC work using the production rigid-flex boards and data acquisition system. Preliminary detector module characterization and coincidence data have been taken using the production system, including initial images.