. Author manuscript; available in PMC: 2012 Jul 1.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2010 Oct 13;80(3):928–937. doi: 10.1016/j.ijrobp.2010.08.006

Table 4.

Variations in the lateral depth to the distal tumor volume surface (D2DT), and the position of the prescription iso-dose (combined dose from 2 lateral beams). For both left and right sides, the positive shift is defined as the expansion of the iso-dose towards the respective lateral surface.

Case	Plan CT D2DT [mm]		In-room CT
	Plan CT D2DT [mm]		D2DT mean ± standard deviation [mm]		Shift in the position of prescription iso-dose [mm]
	Left	Right ^*	Left	Right ^*	Left	Right
1	218	220	221 ± 2	221 ± 3	0.9 ± 2.3	−0.5 ± 2.1
2	282	277	280 ± 3	281 ± 4	3.1 ± 2.8	−0.4 ± 2.5
3	237	226	235 ± 2	228 ± 3	−1.2 ± 1.6	−1.2 ± 1.6
4	243	241	249 ± 3	244 ± 3	−1.6 ± 1.6	−0.7 ± 1.6
5	199	202	200 ± 2	204 ± 2	1.7 ± 1.9	−0.7 ± 1.8
6	199	206	204 ± 2	206 ± 2	1.0 ± 1.8	−1.7 ± 1.8
7	190	192	191 ± 2	191 ± 2	−0.5 ± 1.4	−0.5 ± 1.3
8	197	200	200 ± 2	204 ± 1	0.1 ± 1.4	1.0 ± 1.4
9	232	230	237 ± 2	232 ± 2	0.1 ± 1.5	0.8 ± 1.3
10	208	207	206 ± 2	204 ± 2	0.1 ± 2.1	−2.2 ± 2.2

Repeated from Table 3 for convenience

Abbreviations: CT = computed tomography scan, D2DT = depth to distal tumor volume surface