Scattering estimation method, scattering estimation program, and positron CT device equipped with the same

摘要

In the scatter estimation method of the present invention, step S1 (first TOF projection data creation) and step S4 (non-TOF scatter estimation algorithm) are performed, and step S2 (second TOF projection data creation) and step S3 (TOF projection data creation) are performed. Calculation of distribution ratio in the direction) is performed, and step S5 (calculation of TOF scattering projection data) is performed. The distribution ratio is determined from the second TOF projection data measured in the energy window for scattered radiation (low energy window), and the distribution target is non-TOF in the energy window for reconstruction data (normal energy window). Since it is scattered projection data, the TOF scattered projection data after distribution is approximately obtained as TOF scattered projection data in the energy window (normal energy window) for reconstruction data, and scatter estimation can be accurately performed. .