Table II.

Comparison of relative dose of chest to umbilicus calculated from measurements of Cherenkov (after prospective correction), IVD, and optical stimulated luminescent dosimeter (OSLD). The IVD values labeled with “*” are corrected with the OSLD measurements while those in parentheses are excluded from the study due to compromised diode readings. The mean and overall relative standard deviation (stdev, %) is calculated using ∑σ/n and $\sqrt{\sum \frac{{\sigma }^2}{n-1}}$. For OSLD, patient 5 data were excluded; for diodes, data in () were excluded. Data for patients 7 and 11 were affected by room light and thus excluded from data analysis. Cherenkov data for AP of patient 14 and 15 were not taken. Treatment types: W—whole body; P—partial body, including shielding of the head, upper, and/or lower bodies.

Patient label	Type	Postures	Cherenkov w prospective corr.	OSLD	Error, OSLD to Cherenkov (%)	Diode	Error, diode to Cherenkov (%)
2	P	AP	0.92	0.90	−2.2	0.85	−7.5
		LAO	0.90	0.85	−6.1	0.94	4.5
		RAO	0.90	0.85	−5.7	1.05	16.4
3	W	AP	0.97	1.00	2.8	1.02*	4.4*
		LAO	1.00	0.99	−1.6	1.03*	2.6*
		RAO	0.96	0.99	3.9	1.01	5.9
4	W	AP	0.94	0.97	3.5	1.10	17.5
		LAO	0.98	1.00	2.1	1.08	10.8
		RAO	0.99	1.00	1.4	1.03	4.9
5	P	AP	0.42	0.34	−18.6	0.38	−9.2
		LAO	0.46	0.38	−16.2	0.44	−2.8
		RAO	0.52	0.38	−26.5	0.45	−13.3
6	P	AP	0.92	0.90	−2.1	0.92	0.0
		LAO	0.97	0.99	2.0	0.89*	−8.8*
		RAO	1.03	0.99	−4.2	0.97	−6.0
8	P	AP	0.95	0.96	0.6	1.01	6.0
		LAO	0.93	0.94	0.9	1.05	12.7
		RAO	0.96	0.94	−2.2	1.06	9.7
9	P	AP	0.92	0.91	−0.4	0.99	7.4
		LAO	0.96	0.94	−1.2	1.24*	30.0*
		RAO	0.93	0.94	1.1	1.01	7.8
10	W	AP	1.00	0.99	−0.8	1.00	0.1
		LAO	0.99	0.98	−1.3	1.13*	15.9*
		RAO	0.97	0.98	0.5	1.05	6.4
12	W	AP	0.96	0.97	0.9	0.97	0.8
		LAO	0.99	0.99	−0.2	−0.71	(−28.0)
		RAO	0.98	0.99	0.5	−0.77	(−21.7)
13	W	AP	0.86	0.88	2.7	1.04	22.0
		LAO	0.97	0.99	2.2	1.00	2.2
		RAO	0.98	0.99	1.1	1.22*	26.6*
14	W	LAO	0.97	0.98	0.6	1.00	3.0
		RAO	0.97	0.98	1.0	1.13*	16.0*
15	P	LAO	0.92	0.93	0.8	0.57	(−37.8)
		RAO	0.90	0.93	2.6	0.61	(−32.3)
16	W	AP	0.99	0.96	−3.0	1.00	5.9
		LAO	1.02	1.01	−1.4	1.10	1.5
		RAO	0.99	1.01	2.1	1.08	6.0
17	W	AP	0.98	1.02	4.4	1.04	5.9
		LAO	1.00	1.00	0.2	1.05	1.5
		RAO	1.03	1.00	−2.9	1.06	6.0
18	W	AP	1.00	1.01	1.0	0.98	−2.1
		LAO	1.01	1.03	2.2	1.07	5.6
		RAO	1.01	1.03	1.6	1.14	13.0
				Mean ± SD (%)	0.2 ± 2.4		7.1 ± 11.5