Ray-driven analytical fan-beam SPECT reconstruction with nonuniform attenuation
Proceedings IEEE International Symposium on Biomedical Imaging - Trang 629-632
Tóm tắt
Single-photon emission computed tomography (SPECT) is based on the measurement of radiation emitted by a radiotracer injected into the patient. Because of photoelectric absorption and Compton scatter, the photons are attenuated inside the body before arriving at the detector. A quantitative reconstruction must consider the attenuation, which is usually non-uniform. Novikov and Natterer had derived an explicit formula for nonuniformly attenuated SPECT reconstruction of parallel-hole collimators. In this paper, we extend their researches to fan-beam collimators. Because any ray in fan-beam geometry can be treated as a ray in parallel-beam geometry, we derived a ray-driven analytical fan-beam reconstruction formula with non-uniform attenuation. Its accuracy is demonstrated computer simulation experiments.
Từ khóa
#Attenuation #Collimators #Geometry #Computed tomography #Electromagnetic wave absorption #Electromagnetic scattering #Particle scattering #Single photon emission computed tomography #Detectors #Computer simulationTài liệu tham khảo
10.1109/42.750255
10.1088/0266-5611/17/1/309
10.1109/42.310886
10.1109/42.746632
10.1137/0139029
10.1109/42.241886
10.1088/0266-5611/17/2/309
novikov, 2000, An inversion formula for the attenuated X-ray transformation, Preprint