Correcting scan‐to‐scan response variability for a radiochromic film‐based reference dosimetry system

Abstract

In the absence of measures to deal with the response irregularities, each factor the authors investigated could lead to dose uncertainty >2%. Those factors related to the film-to-light source distance could be particularly impactful since the authors observed many instances where the curl of film samples had the potential to cause dose uncertainty in excess of 5%. Two expedients will eliminate the uncertainties: a transparent sheet (preferably glass) placed over the scanned film keeps the film-to-light source distance constant, and an EBT3 reference film included in all scans provides correction factors for measured response values.

Monte Carlo simulations of a low energy proton beamline for radiobiological experiments

“…The asymmetry in the measured dose profiles, especially in the horizontal direction, was not seen in the MC simulated dose profiles. This asymmetry may be due to a bending of the Gafchromic EBT3 films, as discussed by Lewis and Devic [15], which could lead to errors and asymmetry in the dose measurements. Considering the observed steep lateral dose gradients, position A is not suitable for cell irradiation.…”

An experimental extrapolation technique using the Gafchromic EBT3 film for relative output factor measurements in small x-ray fields

“…The resulting scans were then corrected for any interscan variations based on the control film's result compared to the average result in a technique similar to that used by Lewis and Devic. 23 The dose delivered to each experimental film was calculated by the creation of a calibration dose-response curve for the Gafchromic EBT3 film by using standard x-ray fields of 10 × 10 cm at given applied dose levels. This was performed due to the known nonlinear relationship of net optical density to dose-response of the Gafchromic EBT3 film when scanned using an Epson10000XL desktop scanner.…”

Reducing the dosimetric impact of positional errors in field junctions for craniospinal irradiation using VMAT

“…Irradiated films were later analysed using a web application for radiochromic film dosimetry (Radiochromic.com, v2.2; https://radiochromic. com/) [17], using a correction for scanner response variability [18].…”