Comparison of Surface Dose During Whole Breast Radiation Therapy on Halcyon and TrueBeam Using Cherenkov Imaging

Overview

Journal Proc SPIE Int Soc Opt Eng

Date 2023 Apr 27

PMID 37101538

Authors

Daniel A Alexander

Olivia Certa

Allison Haertter

Taoran Li

Neil Taunk

Timothy C Zhu

Affiliations

Soon will be listed here.

Abstract

The emergence of the Halcyon linear accelerator has allowed for increased patient throughput and improved treatment times for common treatment sites in radiation oncology. However, it has been shown that this can lead to increased surface dose in sites like breast cancer compared with treatments on conventional machines with flattened radiation beams. Cherenkov imaging can be used to estimate surface dose by detection of Cherenkov photons emitted in proportion to energy deposition from high energy electrons in tissue. Phantom studies were performed with both square beams in reference conditions and with clinical treatments, and dosimeter readings and Cherenkov images report higher surface dose (25% for flat phantom entrance dose, 5.9% for breast phantom treatment) from Halcyon beam deliveries than for equivalent deliveries from a TrueBeam linac. Additionally, the first Cherenkov images of a patient treated with Halcyon were acquired, and superficial dose was estimated.

Citing Articles

Characterization of Cherenkov imaging parameters and positional constraints on an O-ring linear accelerator.

Alexander D, Majji S, Jermyn M, Byrd B, Bruza P, Li T Phys Med Biol. 2023; 68(20).

PMID: 37757840 PMC: 10693929. DOI: 10.1088/1361-6560/acfdf2.

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