Table 1.

Comparison of device specifications between Sun Nuclear SRS MapCHECK® and ArcCHECK®

	SRS MapCHECK	ArcCHECK
Model No.	1179	1220
Dimension	2D	3D
Array size	7.7 cm × 7.7 cm	21.0 cm in diameter and in length
Total No. of detectors	1013	1386
Detector spacing	2.47 mm (diagonally)	10 mm (along cylindrical length and circumference)
Active detector area	0.48 mm × 0.48 mm	0.8 mm × 0.8 mm