Dosimetric characterization of a liquid‐filled ion chamber array post upgrade and evaluation of improvements for stereotactic plan verification

The replaced cable and upgraded front foil and detector field have had a positive impact on the dosimetric performance of the 1000^SRS array. The unaffected array housing and EPOM means no change is required for positioning and measurement set-up. The absorbed dose determination under reference conditions has not been impacted but improved dose-rate linearity, relative calibration of peripheral chambers, and signal leakage mean measurements under non-reference conditions such as a VMAT delivery are more accurate than before.