320 / 1224
Monte Carlo for TPS?
➢
t
CALC
reductions from: photon only tracking (20%-70%), track length scoring (20-
30), pre-calculated source phase space (30%-40%), variance reduction (40-60) +
(inherent) parallelization and reduction of t
CALC
/N from availability of multi-core
processors have facilitated clinically viable calculation times :
✓
sub-minute to minutes for LDR applications
MCPI (GEPTS): Chibani & Williamson 2005 Med Phys 32, 3688
BRACHYDOSE (EGSnrc): Thomson et al 2010 Med. Phys. 37, 3910
ALGEBRA (GEANT4): Afsharpour et al. 2012 Phys Med Biol 57, 3273
✓
2.5–17 minutes for 40
3
–140
3
2mm voxels for HDR rectal application
BRACHYGUI (PTRAN) Poon et al 2008 J Phys Conf Ser 102, 012018.
➢
further reduction of of t
CALC
/N from GPU implementation :
✓
Tian et al, “Monte Carlo dose calculations for high-dose–rate brachytherapy using
GPU-accelerated processing,”
Brachytherapy
15(3), pp. 387 (2016).