Evaluation of heterogeneity dose distributions for Stereotactic Radiotherapy (SRT): comparison of commercially available Monte Carlo dose calculation with other algorithms

Table 2 Comparison of IC doses in four algorithms with the measeured doses

	Pinpoint chamber	SHM	error	CCC	error	SP	error	MC	error
	[cGy]	[cGy]	[%]	[cGy]	[%]	[cGy]	[%]	[cGy]	[%]
Single Beam (3 × 3 cm²) in Water Phantom^a)	124.6	124.0	0.48	124.4	0.16	125.5	-0.72	123.9	0.56
Eight Beams (4 × 4 cm²) in inhomogeneous Phantom^b)	200.9	209.6	-4.33	199.9	0.50	200.6	0.15	201.7	-0.40

Abbreviations: SHM, scatter homogeneous mode, CCC, C.C.Convolution, SP, Superposition, MC, Monte Carlo.
a) Single delivery of 200MU from gantry angle of 0 degree.
b) Static 8 beams; the gantry, couch angles and MU were 180° + 0° 33.5MU, 260° + 0° 44.3MU, 340° + 0° 33.6MU, 30° + 40° 34.1MU, 35° + 320° 35.3MU, 320° + 320° 36.1MU, 30° + 90° 34.4MU, 330° + 90° 34.5MU, respectively. The MU employed here has equal weights in IC dose of CCC in inhomogeneous phantom.

ISSN: 1748-717X