Dosimetric advantages of a “butterfly” technique for intensity-modulated radiation therapy for young female patients with mediastinal Hodgkin’s lymphoma

Table 2 Comparison of the mean conformity index, homogeneity index, V _107% , PTV dose, and monitor units delivered per fraction for anteroposterior-posteroanterior (AP-PA) or butterfly intensity-modulated radiation therapy (IMRT) techniques

	IMRT	AP-PA	Difference	P value*
RTOG Conformity Index (V_100%/V_PTV)	1.10	1.66	−0.56	0.37
RTOG Homogeneity Index (Imax/RI)	1.15	1.14	0.01	0.89
V_107%, cm³	47.7	801.5	−753.8	0.01
PTV dose, Gy	31.39	32.02	−0.63	0.01
Monitor Units per Fraction	797	208	589	0.01

Imax is the maximum isodose or maximum point dose. RI is the reference isodose or 30.6 Gy.
*P values generated by the Wilcoxon match-pairs signed-rank test for non-parametric comparisons.

ISSN: 1748-717X