Table 5.

Absolute difference between original full‐resolution CT plans (Org.) and two types of 5 bulk density plans in patients with special conditions: PopAv., where population average data were used, and CpopAv., where a condition‐oriented special modification was applied.

Condition	No. of patients	Parameter	Org. vs. PopAv.			Org. vs. CpopAv.
			Mean	SD	Nr. a	Mean	SD	Nr. a
Emphysema alone	8	PTV D95 b (%)	2.26	2.70	2	1.04	1.13	0
		PTV mean dose (%)	1.27	1.42	1	0.41	0.49	0
$\text{Emphysema}+\text{Inflammatory changes}$	2	PTV D95 b (%)	7.86	2.63	2	1.85	0.57	0
		PTV mean dose (%)	5.13	3.12	1	2.13	0.58	0
$\text{Emphysema}+\text{hiatus hernia}$	1	PTV D95 b (%)	0.81	‐	0	0.35	‐	0
		PTV mean dose (%)	3.21	‐	1	0.96	‐	0
Bullous formations/pneumothorax c	10	PTV D95 b (%)	1.49	1.56	2	1.13	0.99	0
		PTV mean dose (%)	0.81	0.74	0	0.75	0.72	0

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

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

^cThe one patient who has both emphysema and pneumothorax is included here.

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