Table 4.

Percent difference/DTA comparison between EPID converted dose planes to 2D diode array measurements for seven designed test fields (Varian linac) and two analysis criteria (% difference/DTA) for 3 mm/3% and 2 mm/2% (DTA). The number of distinct diode measurement positions in the fields is shown, as some of these fields were quite small and did not cover many diodes in the MapCHECK array.

Field Description	3 mm/3% Pass Rate	2 mm/2% Pass Rate	Points Analyzed
$1.0\times 1.0$ MLC, $10\times 10$ Primary Jaws	100.0	100.0	6
$1.5\times 2.0$ MLC, $10\times 10$ Primary Jaws	100.0	91.7	12
$2.0\times 1.0$ MLC, $10\times 10$ Primary Jaws	100.0	93.3	15
$3.0\times 3.0$ MLC, $10\times 10$ Primary Jaws	100.0	100.0	28
$5.0\times 5.0$ MLC, $10\times 10$ Primary Jaws	97.1	91.3	69
$7.0\times 7.0$ MLC, $10\times 10$ Primary Jaws	94.2	88.3	121
Inverted Dose Pyramid (11 MLC segments, fixed $10\times 10$ Primary Jaws)	99.2	88.4	250