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Related Experiment Video

Updated: Apr 2, 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

A surface-conforming flexible collimator for improving electron radiotherapy.

Parker New¹, Holly Paschal¹, Nema Bassiri¹

¹Department of Radiation Oncology, University of Texas at San Antonio, San Antonio, TX, United States of America.

Physics in Medicine and Biology

|March 31, 2026

Summary

This summary is machine-generated.

A novel cable collimator system significantly improves electron radiotherapy precision by reducing the penumbra, offering a more accurate alternative to traditional skin collimation methods for enhanced patient treatment.

Keywords:

cable collimator electron therapy skin collimation

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Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Technology

Background:

Traditional patient-specific skin collimation in electron radiotherapy can lack precision.
Improving the accuracy of electron beam delivery is crucial for effective cancer treatment.

Purpose of the Study:

To develop and evaluate a new surface-conforming collimation system for electron radiotherapy.
To simplify patient-specific skin collimation and enhance treatment precision.

Main Methods:

A novel collimator using parallel, adjustable steel cables was designed and constructed.
The cable collimator's packing fraction was determined (0.551 ± 0.016).
Penumbra width was measured using radiochromic film for various electron energies (6-15 MeV) and source-surface distances (SSDs).

Main Results:

The cable collimator consistently reduced penumbral width compared to conventional methods across all tested energies and SSDs.
Significant penumbra reduction was observed, e.g., from 18.7 mm to 1.4 mm at 6 MeV and 110 cm SSD at the surface.
Surface dose inhomogeneities were more pronounced at higher energies.

Conclusions:

The prototype surface-conforming cable collimator demonstrates substantial improvements in penumbra reduction.
This system offers a promising replacement for current skin collimation techniques in electron radiotherapy.
Potential for integration with Cerrobend applicators for advanced surface blocking is highlighted.