Correlation between target motion and the dosimetric variance of breast and organ at risk during whole breast radiotherapy using 4DCT

Table 2 Correlation between the whole respiratory cycle target motion/volume and heart parameters for left-sided patients

		V₅	V₁₀	V₂₀	V₃₀	V₄₀	V₅₀	D_mean
LR	r	0.170	0.326	0.394	0.412	0.481	0.274	0.393
LR	P	0.638	0.358	0.236	0.236	0.159	0.444	0.377
AP	r	0.523	0.356	0.274	0.296	0.188	−0.397	−0.338
AP	P	0.121	0.313	0.444	0.406	0.603	0.256	0.339
SI	r	−0.795	−0.590	−0.44	−0.446	−0.286	0.483	0.496
SI	P	0.006	0.073	0.203	0.196	0.424	0.157	0.145
Vector	r	0.687	0.470	0.324	0.327	0.174	−0.509	−0.445
Vector	P	0.028	0.170	0.361	0.356	0.632	0.133	0.198
volume	r	−0.390	−0.287	−0.196	−0.166	−0.104	0.252	−0.236
volume	P	0.265	0.421	0.588	0.647	0.775	0.482	0.512

Abbreviations: LR lateral; AP anteroposterior; SI superoinferior; V_x volume receiving more than x Gy; D_mean the mean dose.

ISSN: 1748-717X