Table 1.

Results of the regression coefficients β_i for estimating the relationship between V12Gy and planning target volume (PTV), prescribed isodose level (PIL) and treatment time (TT) for all clinical targets as well as for all phantom targets (see Eq. 5)

	Clinical targets	Phantom targets
β0	$9.23\bullet {10}^{-1}$	$2.15\bullet {10}^{-1}$
β1	$1.70\bullet {10}^{-3}$	$1.34\bullet {10}^{-3}$
β2	$1.45\bullet {10}^{-5}$	$2.66\bullet {10}^{-5}$
β3	$-2.13\bullet {10}^{-5}$	$-1.30\bullet {10}^{-5}$