S/N | SPECT | PET | References |
1 | The radioisotope generates gamma decay. | PET imaging utilizes positron-emitting radioisotopes. | [20] [29] |
2 | Like CT, the photons are absorbed in multiple directions. | Absorb projections in different directions. However, PET can only generate two photons in two different directions at a time. | [29] |
3 | The rotating anger camera serves as the detector to collect projection data from various angles. | The detector is a special coincidence detection circuitry used to simultaneously detect two photons travelling in opposite directions. | [20] [29] |