Intensity modulated radiation therapy (IMRT): differences in target volumes and improvement in clinically relevant doses to small bowel in rectal carcinoma

Table 2 Plan summary comparison of IMRT and 3DCRT plans: median value (range)

Parameter	IMRT	3FBB	3DCRT
MU/fraction	786 (730 - 950)	238 (224 - 272)†	242 (232 - 276)†
D_max (Gy)	48.8 (48.4 - 49.4)	48.8 (48.1 - 51.0)	48.2 (47.8 - 49.2)†
Integral dose	2.74 (2.39 - 4.03)	2.56 (2.15 - 3.60)†	2.86 (2.49 - 4.12)†
(Gycm³10^-5)

Abbreviations: MU = monitor units; IMRT = intensity modulated radiation therapy; 3FBB = 3 field belly board; 3DCRT = 3 dimensional conformal radiation therapy;denotes statistically significant difference with IMRT as comparator, p < 0.05 (*) or p < 0.01 (†); otherwise, not statistically significant.

ISSN: 1748-717X