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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.
f th d ti f f t /N f
GPU i l
t ti
i ht d th t i k
ur er re uc on o o
CALC
rom mp emen a on m g o e r c :
sub-sec for single source, 2 sec for HDR+shield implant
Hissoiny et al Med Phys 39 (2012)
,
.
.
Tian et al, “Monte Carlo dose calculations for high-dose–rate brachytherapy using
GPU-accelerated processing,”
Brachytherapy
15(3), pp. 387 (2016).