Table 2.

Comparison of target volumes isodose coverage (%) between the standard plan (SP) and left anterior descending coronary artery – shielded plan (LADSP)

		SP (% volume)	LADSP (% volume)	P value
CTVbreast	90% isodose coverage	99.37	99.07	0.0032
	95% isodose coverage	97.61	97.22	0.0005
	100% isodose coverage	84.32	83.56	0.0001
CTVboost	90% isodose coverage	99.97	99.97	0.3223
	95% isodose coverage	99.34	99.32	0.4890
	100% isodose coverage	59.13	59.13	0.9851
	Dmax (Gy)	61.89	61.93	0.0753
PTVbreast Eval	90% isodose coverage	98.7	97.69	<0.0001
	95% isodose coverage	95.91	94.58	<0.0001
	100% isodose coverage	79.1	77.41	<0.0001
PTVboost Eval	90% isodose coverage	99.85	99.82	0.0952
	95% isodose coverage	95.56	95.26	0.0096
	100% isodose coverage	43.46	43.27	0.4308
	Dmax (Gy)	61.96	61.98	0.0441

SP, standard plan; LADSP, left anterior descending coronary artery – shielded plan; CTV, clinical target volume; PTV, planning target volume.