. 2015 Apr 10;88(1049):20140723. doi: 10.1259/bjr.20140723

Table 2.

Summary of the dosimetric results obtained at the audited Centres A and B

Beam dosimetry	Measured values at standard distance					Single/dual field at treatment distance		Clinical simulation thermoluminescent dosemeter results
Centre	Output (cGy MU⁻¹)	Energy ratio	Flatness (% average TGAB)	Symmetry (%)		Output (cGy MU⁻¹)	Energy ratio	Mean trunk dose (percentage of prescribed dose ±1 standard deviation)
Centre	Output (cGy MU⁻¹)	Energy ratio	Flatness (% average TGAB)	TG	AB	Output (cGy MU⁻¹)	Energy ratio
Centre A	10.98	0.650	98.1	99.7	100.8	0.500 (S); 0.465 (D)	0.495 (S); 0.490 (D)	98.4 ± 6.9
Centre A	(95-cm SSD)					0.500 (S); 0.465 (D)	0.495 (S); 0.490 (D)	98.4 ± 6.9
Centre B	12.69	0.529	85.0	101	99.5	0.406 (S); 0.446 (D)	0.511 (S); (D) not measured	93.3 ± 3.6
Centre B	(100-cm SSD)					0.406 (S); 0.446 (D)	0.511 (S); (D) not measured	93.3 ± 3.6
Auditing centre baseline values	10.0	0.405	98.5	100	100	0.600 (S and D)	0.465	99.3 ± 8.1 (for all patients to date)
Auditing centre baseline values	(95-cm SSD)					0.600 (S and D)	0.465	99.3 ± 8.1 (for all patients to date)

A, left as facing linac; B, right as facing linac; D, dual; G, gun; MU, monitor unit; S, single; SSD, source to surface distance; T, target.