. 2020 Apr 30;21(7):70–76. doi: 10.1002/acm2.12885

Table 3.

Response to survey question: “What comparison do you perform?” for a subset of standard tools (2D Diode Array, Ion Chamber Array, EPID, and 2.5D (pseudo 3D) Array/Multi‐plane Array) used for the verification of planned dose delivered by the treatment unit. N is the number of respondents who selected the tool and should vary with each tool as indicated.

	2D Diode Array (N = 853)	Ion Chamber Array (N = 426)	EPID (N = 421)	2.5D (pseudo 3D) array/multiplane array (N = 245)
Measurement vs Calculation in Phantom	97.9% (835)	96.5% (411)	87.4% (368)	92.2% (226)
Measurement Mapped onto Patient CT Dataset	2.1% (18)	3.5% (15)	12.6% (53)	7.8% (19)

2D Diode Array (N = 853)

Ion Chamber Array (N = 426)

EPID

(N = 421)

2.5D (pseudo 3D) array/multiplane array (N = 245)

Measurement vs Calculation in Phantom

97.9% (835)

96.5% (411)

87.4% (368)

92.2% (226)

Measurement Mapped onto Patient CT Dataset

2.1% (18)

3.5% (15)

12.6% (53)

7.8% (19)