Chest wall desmoid tumours treated with definitive radiotherapy: a plan comparison of 3D conformal radiotherapy, intensity-modulated radiotherapy and volumetric-modulated arc radiotherapy

Table 2 Summary of dosimetric results for PTV

Parameter	3DCRT	IMRT	VMAT	P value
Parameter	3DCRT	IMRT	VMAT	3DCRT vs IMRT	3DCRT vs VMAT	IMRT vs VMAT
Minimum (Gy)	40.0 ± 8.8	32.5 ± 11.2	30.57 ± 13.5	0.028	0.037	0.508
Maximum (Gy)	63.8 ± 3.0	67.5 ± 8.9	63.9 ± 2.9	0.203	0.959	0.333
Mean (Gy)	58.2 ± 1.9	57.5 ± 2.0	57.1 ± 1.4	0.092	0.074	0.878
D_5%(Gy)	61.6 ± 2.2	60.5 ± 3.0	60.3 ± 2.5	0.169	0.037	0.859
D_95%(Gy)	55.3 ± 2.8	53.3 ± 2.8	50.0 ± 8.6	0.203	0.053	0.114
HI (D5 % -D95 % ; Gy)	6.27 ± 2.76	7.20 ± 4.60	10.25 ± 10.42	0.575	0.386	0.139
V95 % (%)	95.5 ± 3.2	92.2 ± 7.2	92.5 ± 5.6	0.333	0.139	0.799
CI	1.35 ± 0.2	1.03 ± 0.13	0.98 ± 0.14	0.005	0.005	0.445
MU	313 ± 112	1427 ± 532	570 ± 285	0.005	0.432	0.005
Beam on time (second)	206 ± 122	302 ± 86	366 ± 164	0.056	0.005	0.231

CI Conformity index, defined as the ratio between the volume receiving at least 95 % of the prescribed dose and the volume of the PTV, HI Homogeneity index, defined as difference between the dose covering 5 % and dose covering 95 % of the PTV. P value determined using Wilcoxon matched pair rank sum test in SPSS

ISSN: 1748-717X