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Related Experiment Video

Updated: Mar 2, 2026

Dosimetry for Cell Irradiation using Orthovoltage 40-300 kV X-Ray Facilities

Dosimetry for Cell Irradiation using Orthovoltage 40-300 kV X-Ray Facilities

Published on: February 20, 2021

Precise radiochromic film dosimetry using a flat-bed document scanner.

Slobodan Devic¹, Jan Seuntjens¹, Edwin Sham¹

¹Medical Physics Department, McGill University Health Centre, Montréal, Québec H3G 1A4, Canada.

Medical Physics

|May 12, 2017

Summary

This study presents a precise dose measurement protocol using GafChromic® films and a flat-bed scanner. The new method achieves 2% or less uncertainty for 6MV photon beams, enhancing radiation dosimetry accuracy.

Keywords:

Absorption spectra Ancillary equipment Calibration Charge coupled devices Densitometers Density measurement Dosimetry Dosimetry/exposure assessment Error analysis Image scanners Photons Transmission measurement dosimetry flat-bed scanner radiation therapy radiochromic film dosimetry sensitivity curves uncertainty analysis

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Area of Science:

Medical Physics
Radiation Dosimetry
Radiotherapy Physics

Background:

Accurate dose measurement is critical in radiotherapy.
GafChromic® films offer a reliable method for dose verification.
Flat-bed scanners provide a cost-effective solution for film dosimetry.

Purpose of the Study:

To develop and validate a precise measurement protocol for GafChromic® films using a flat-bed scanner.
To reduce uncertainties in dose measurements for 6MV photon beams.
To assess the performance of new GafChromic® film models (HS and Prototype A EBT).

Main Methods:

A novel measurement protocol was established for dose assessment.
Two GafChromic® film models (HS and Prototype A EBT) were exposed to 6MV photon beams.
Dose measurements were performed using an Agfa Arcus II flat-bed document scanner.
Uncertainties were quantified, considering measurement and calibration curve fit parameters.

Main Results:

The protocol achieved an overall one-sigma dose measurement uncertainty of 2% or less.
This precision was met for doses above 0.4Gy (Prototype A EBT) and 5Gy (HS model).
A 2x2mm² region of interest was utilized for accurate dose evaluation.

Conclusions:

The presented protocol significantly improves the precision of dose measurements with GafChromic® films and flat-bed scanners.
This method is suitable for accurate dose verification in clinical radiotherapy settings.
The new GafChromic® film models demonstrate reliable performance for dosimetry applications.