Investigation of a 3D dosimetry system utilizing radio-chromic gel and telecentric optical-CT readout.

Background: Sophisticated modern radiation therapy treatments require comprehensive validation in 3D.

Purpose: Investigation and characterization of a novel 3D dosimetry system consisting of ClearView radiochromic gel dosimeters (commercially available from Modus Inc) and an in-house telecentric optical CT scanner DLOS (the Duke Large Field of View Optical-CT Scanner).

Methods: Spectrophotometry measurements were made on small volumes of ClearView gel irradiated with 6X photon doses up to 40 Gy to determine linearity and temporal stability of dose response.