A study on the response of 2D ion chamber array detector for VMAT delivery

Purpose This study aims to evaluate the response of D ion chamber array detector for VMAT delivery Methods D array ionization chamber equipped with ionization chambers uniformly arranged in a times matrix with an active times cm was used for the study An Octagonal shaped phantom Octavius Phantom with a central cavity is used to insert the D ion chamber array All measurements were done with a linear accelerator The plans that are already being verified has been selected for studying the response of D array Results This study shows that the response of the D array gets reduced as compared to early quality assured plans Plans were analyzed using the Gamma analysis method The results show a variation up to comparing earlier plans Conclusion The response of the D array gets reduced while compared with earlier quality assured plans