Table 4.

Absolute difference between original full‐resolution CT plans (Org.), 5 bulk density plans using each patient's average data (IndAv.), and 5 bulk density plans using population average data (PopAv.).

	Org. vs. IndAv.			Org. vs. PopAv.
	Mean	SD	Nr.a	Mean	SD	Nr.a
PTV D95b (%)	1.18	1.24	5	1.2	1.7	7
PTV mean dose (%)	0.89	0.89	3	0.87	1.09	3
Lung V20Gy%c	0.49	0.49	0	0.23	0.34	0
Lung mean dose (%)	0.63	0.57	0	0.23	0.41	0

^aNumber of tumors where the difference was 3% or larger.

^bPTV D95; Dose covering 95% or more of the PTV.

^cLung V20Gy%: Percentage of the lung volume covered with 20Gy or more.

$\text{PTV}=\text{planning target volume};\text{SD}=\text{standard deviation}$