TABLE I.

Local percent dose differences between the multiple ion chamber phantom measurements and the planning system calculations at different locations within the 24 plans. Measurements which were greater than ±3% different from the tps planned dose are in italics, those that differ by more than 4% are in bold.

	Percent differences between measured and calculated doses
Plan	1	2	3	4	5	6	7	8	9	10	Acceptable (Y/N)
GI 1	4.2%	6.0%	5.9%	5.7%	6.1%	3.5%	3.1%	5.4%	0.7%		N
GI 2	5.1%	6.6%	4.8%	1.2%	2.0%	6.2%	5.4%	5.2%	1.4%	2.3%	N
GI 3	−0.7%	2.0%	1.2%	5.5%	5.1%	−1.2%					N
GI 4	−0.4%	−0.1%	0.8%	0.9%	0.7%	1.0%	1.3%	0.8%	1.0%		Y
GI 5	−2.7%	−1.2%	−0.4%	−3.2%	−1.0%	−2.1%	−1.8%	−0.7%			Y
GU	−2.8%	−2.1%	−1.6%	−2.8%	−2.8%	−0.8%	−3.3%				Y
Gyn 1	−2.1%	−1.8%	−2.7%	−0.8%	−1.2%	−1.9%	0.5%	−0.8%	−1.3%		Y
Gyn 2	2.9%	1.6%	3.1%	1.7%	2.7%	2.7%	1.5%	7.4%			N
HN 1	−3.3%	−1.7%	−2.0%	−3.4%	−2.5%	−1.4%	−1.5%				Y
HN 2	0.4%	−1.1%	−2.0%	−0.2%	0.7%	1.3%	−0.2%	−1.2%			Y
HN 3	−0.7%	−0.8%	−0.9%	−0.9%	0.3%	−2.4%					Y
HN 4	−1.7%	−2.7%	−5.1%	−1.0%	−2.9%	0.0%	−5.5%				N
HN 5	−2.6%	−0.6%	−2.1%	−2.1%	−1.4%	3.6%	−0.1%				Y
Lung stereo	−1.7%	−4.7%	−1.7%	−4.9%							N
Mantle	−2.7%	−0.9%	−7.3%	−5.5%	−6.2%						N
Meso 1	4.3%	5.3%	6.3%	4.0%	1.6%	5.3%	2.4%	5.3%	4.8%	4.7%	N
Meso 2	7.4%	4.8%	5.2%	1.6%	5.4%	4.5%	3.2%	2.3%			N
Meso 3	3.8%	3.6%	1.7%	3.1%	4.1%	2.0%	4.3%	2.2%			N
Meso 4	6.8%	4.6%	3.4%	2.8%	1.3%	7.5%	4.0%	5.7%			N
Rib stereo	−2.1%	−4.4%	−4.9%	−3.4%							N
Spine stereo	−6.8%	−2.3%	−4.8%	−5.0%							N
Thoracic 1	−5.2%	−5.2%	−0.2%	−6.3%	−5.4%	−8.0%	−4.4%				N
Thoracic 2	−3.5%	−2.9%	−2.6%	−3.5%	−4.9%	−1.6%	−1.3%	−3.4%	0.1%		N
Thoracic 3	−2.1%	−1.4%	−1.2%	−2.5%	−3.1%	−1.2%	−1.8%	−0.3%	−3.3%	−0.4%	Y