. SPECT: Single Photon Emission Computed Tomography 4 PET: Positron Emission Computed Tomography NEMA: National Electrical Manufaturer’s Association MCNP: Monte Carlo N – Particle EGS: Electron. Two – Dimensional 3D Three – Dimensional ACR American College of Radiology CM Component Module CT Computed Tomography DICOM Digital Imaging and Communications in Medicine DSS Decision ...