Monitoring 3D dose distributions in proton therapy by reconstruction using an iterative method
Young-Hak Kim1, Changyeon Yoon1, Wonho Lee2
1Department of Bio-Convergence Engineering, Korea University, Hana Science Hall 277, Korea Univ. Anam Campus, Anam-dong 5-ga, Seongbuk-gu, Seoul, Korea.
Abstract:
The Bragg peak of protons can be determined by measuring prompt γ-rays. In this study, prompt γ-rays detected by single-photon emission computed tomography with a geometrically optimized collimation system were reconstructed by an iterative method. The falloff position by iterative method (52.48mm) was most similar to the Bragg peak (52mm) of an 80MeV proton compared with those of back-projection (54.11mm) and filtered back-projection (54.91mm) methods. Iterative method also showed better image performance than other methods.
