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Updated: May 30, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Published on: February 6, 2019

Surface dose measurement for helical tomotherapy.

Jonatan A Snir¹, Homeira Mosalaei, Kevin Jordan

¹London Regional Cancer Program, London Health Sciences Centre, London, Ontario N6A 4L6, Canada.

Medical Physics

|August 6, 2011

Summary

This summary is machine-generated.

Different dosimeters showed comparable surface dose measurements for helical tomotherapy (HT) plans near the surface. Optically stimulated luminescence (OSL) and QED dosimeters offer precision and ease of use for radiation therapy quality assurance.

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Area of Science:

Medical Physics
Radiation Oncology
Dosimetry

Background:

Accurate surface dose measurement is critical for helical tomotherapy (HT) delivery, especially for targets near the surface.
Various dosimeters exist, each with unique characteristics for surface dose assessment.

Purpose of the Study:

To compare surface dose measurements from different dosimeters used in helical tomotherapy (HT) planning.
To evaluate dosimeter performance when the target volume is positioned close to the phantom surface.

Main Methods:

Surface dose measurements were performed using radiochromic films (EBT, EBT2), metal oxide semiconductor field-effect transistor (MOSFET) dosimeters, silicon IVD QED diodes, and optically stimulated luminescence (OSL) dosimeters.
Measurements were taken in a cylindrical phantom for an HT plan delivering 2 Gy to a planning target volume (PTV) 5 mm below the surface.

Main Results:

All evaluated dosimeters demonstrated measurements within a 12% +/- 8% difference.
Radiochromic films offered high spatial resolution but presented challenges in accurate dose measurement.
OSL and QED dosimeters yielded results comparable to MOSFET detectors.

Conclusions:

OSL dosimeters are precise, easy to use, and require minimal setup time.
The QED dosimeter shows promise as a reusable, wireless, on-line dosimeter for radiation therapy.
While radiochromic films offer spatial resolution, OSL and QED dosimeters provide reliable and practical alternatives for surface dose monitoring in HT.