Table 4.

Dosimetric comparison for BM, OC and LS

Parameters	IMRT (N)	IMRT (BM)	IMRT (OC)	IMRT (OC + LS)
BM
Dmean (Gy)	37.57 ± 1.11	32.14 ± 0.25*	32.07 ± 0.61*	29.40 ± 0.52*†
V10 (%)	97.62 ± 1.98	95.46 ± 2.04*	92.72 ± 2.51*†	92.74 ± 2.31*†
V20 (%)	88.38 ± 2.87	76.88 ± 1.99*	70.58 ± 2.00*†	65.67 ± 1.44*†
V30 (%)	72.17 ± 3.67	53.70 ± 1.54*	55.41 ± 2.20*	45.25 ± 1.50*†
V40 (%)	50.03 ± 4.07	33.47 ± 1.70*	38.64 ± 2.83*†	29.63 ± 1.90*†
V50 (%)	20.29 ± 2.42	15.79 ± 1.64*	17.11 ± 1.83*	14.77 ± 1.47*
OC
Dmean (Gy)	33.46 ± 1.46	28.27 ± 0.93*	25.42 ± 0.46*†	25.78 ± 0.59*†
V10 (%)	96.21 ± 3.15	92.94 ± 3.05*	88.47 ± 3.67*†	89.06 ± 3.31*†
V20 (%)	81.97 ± 4.24	67.99 ± 2.74*	53.81 ± 1.84*†	56.51 ± 1.59*†
V30 (%)	58.72 ± 4.66	40.41 ± 2.12*	33.34 ± 1.49*†	33.82 ± 1.56*†
V40 (%)	35.01 ± 3.76	23.00 ± 2.44*	20.60 ± 1.93*†	20.75 ± 2.22*†
V50 (%)	14.11 ± 2.42	11.22 ± 1.86*	10.69 ± 1.75*	10.63 ± 1.74*
LSBM
Dmean (Gy)	44.55 ± 1.54	38.81 ± 1.98*	43.37 ± 1.48*	35.51 ± 0.30*
V10 (%)	99.98 ± 0.07	99.77 ± 0.69	99.98 ± 0.07	99.05 ± 1.47*†
V20 (%)	99.21 ± 1.52	92.14 ± 5.07*	98.86 ± 1.48†	80.97 ± 2.51*†
V30 (%)	94.99 ± 3.18	76.59 ± 7.81*	92.79 ± 3.35†	64.46 ± 1.33*†
V40 (%)	75.70 ± 8.58	51.47 ± 6.89*	69.51 ± 8.60*†	44.54 ± 3.06*†
V50 (%)	30.90 ± 5.27	23.63 ± 3.88*	28.12 ± 4.34*†	21.74 ± 2.71*

Abbreviations: IMRT (N) Without bone marrow as avoidance structures, IMRT (BM) Whole bone marrow as avoidance structures, IMRT (OC) Os coxae as avoidance structures, IMRT (OC + LS) Both os coxae and lumbosacral spine as avoidance structures, BM Bone marrow, OC Os coxae, LS Lumbosacral spine, D_mean the mean dose, V_n percentage of volume receiving n Gy

*p value < 0.05 while comparing IMRT (N) plan with other three plans

^†p value < 0.05 while comparing IMRT (BM) plan with IMRT (OC) and IMRT (OC + LS) plans, respectively