PET/CT Spec Schema

device_class: hybrid
pet_crystal_type: LYSO            # LYSO | LSO | BGO | other
pet_crystal_dimensions_mm: [4.2, 6.3, 25]
pet_crystal_count: 13824
pet_ring_count: 24
pet_blocks_per_ring: 64
pet_crystals_per_block: 54       # 9×6
time_of_flight: true
tof_timing_resolution_ps: 500
ct_base_platform: LightSpeed VCT
ct_slice_count: 64
ct_gantry_aperture_cm: 70
internal_gantry_cooling: true
calibration_source: Ge-68 rods
nrc_license_required: true
rso_required: true
reconstruction_platforms: [VUE Point HD, Q.Clear]
respiratory_gating: true

Rationale

PET/CT is two scanners in one chassis, and the spec has to cover both. Crystal specs + ToF define PET image quality. CT base platform tells buyers what parts overlap exists with standalone CT systems (parts moat). NRC license flag makes the regulatory requirement explicit — it's the #1 thing buyers under-plan for when moving from CT to PET/CT.