Table 1.

Dosimetric Comparison between IMRT and 3 DCRT in Rectal Cancer

Parameter	Mean IMRT(±SD)	Mean 3 DCRT(±SD)	Significance (p value)
PTV D95%	50.2 (±0.4) Gy	50.1 (±0.6) Gy	0.447
PTV D98%	49.2 (±0.5) Gy	49.2 (±0.7) Gy	0.444
PTV D2%	53.8 (±0.5) Gy	54.9 (±1.1) Gy	< 0.001
PTV D50%	52.0 (±0.4) Gy	52.3 (±0.5) Gy	< 0.001
HI	0.1 (±0.0)	0.1 (±0.0)	< 0.001
PTV V110%	0.1 (±0.2)%	4.2 (±5.3)%	< 0.001
PTV V93%	0.1 (±0.1)%	0.0 (±0.0)%	< 0.001
SB Davg	21.9 (±4.6) Gy	25.3 (±5.6) Gy	< 0.001
SB V45Gy	78.8 (±43.4) cc	163.5 (±60.5) cc	< 0.001
UB Davg	43.4 (±2.1) Gy	49.9 (±1.8) Gy	< 0.001
UB V50Gy	24.7%	78.2%	< 0.001