Table 1.

Point dose measured and calculated at the isocenter/ion chamber.

Patient	Site	Ion chamber (ArcCHECK) (cGy)	TPS (cGy)	Dose diff (cGy)	% Dose diff
Patient 1	H & N	158.63	159	−0.37	−0.23
Patient 2	ESOPHAGUS	182.93	184.1	−1.17	−0.64
Patient 3	H & N	130.37	129.7	0.67	0.52
Patient 4	H & N	159.98	154.9	5.08	3.17
Patient 5	H & N	110.31	109.6	0.71	0.64
Patient 6	ABDOMEN	191.86	193.3	−1.44	−0.75
Patient 7	H & N	145.98	145.4	0.58	0.39
Patient 8	H & N	141.32	140.9	0.42	0.3
Patient 9	PELVIS	198.87	199.6	−0.73	−0.37
Patient 10	BREAST	158.21	159.2	−0.99	−0.63
Patient 11	PELVIS	173.14	174.1	−0.96	−0.55
Patient 12	ESOPHAGUS	169.66	170.4	−0.74	−0.44