Table 3.

Dosimetric comparison for 8‐field prostate treatment plan with various misalignments

Plan alignment/shifts	Center detector			Edge detector
	Measured dose (cGy)	Calculated dose (cGy)	Difference	Measured dose (cGy)	Calculated dose (cGy)	Difference
Correct alignment	171.1	179.8	$-4.8\%$	166.1	170.6	$-2.6\%$
Vertical shift, 0.5 cm	172.7	179.3	$-3.7\%$	140.8	145.6	$-3.3\%$
Lateral shift, 0.5 cm	175.2	179.7	$-2.5\%$	169.1	169.3	$-0.1\%$
Rotated detectors	172.8	179.7	$-3.8\%$	170.7	172.4	$-1.0\%$
Bolus on bottom	169.9	178.4	$-4.8\%$	159.9	166.0	$-3.7\%$
Bolus on top	166.6	177	$-5.9\%$	94.4	104.3	$-9.5\%$