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Utility of 3D Printer in Brachytherapy to Fabricate End-To-End Testing Phantoms for Multiple Purposes

A Gomez, L Rodriguez, W Romaguera, T Poozhikala, T Romaguera, J Contreras, R Tolakanahalli, V Chaswal*, Miami Cancer Institute, Miami, FL

Presentations

(Saturday, 3/26/2022)   [Central Time (GMT-5)]

Purpose: To demonstrate the utility of in-house 3D-printing to produce Brachytherapy phantoms for multiple HDR Gynecological brachytherapy applicators for end-to-end testing, dose verification, workflow testing and personnel training.

Methods: Three CT/MRI compatible phantoms were fabricated for brachytherapy end-to-end testing for multiple HDR gynecological applicators. The phantoms were designed to hold brachytherapy applicators and dosimeters in stable reproducible positions during testing. An Airwolf™ AXIOM 20 Large Format 3D-Printer with AutoCAD fusion 360 software was used to fabricate the phantoms. The phantom for the Single Channel Vaginal cylinder (SCVC) was made with near-tissue-equivalent silicone rubber, holding five optically stimulated luminescence dosimeters (OSLD) 0.5-2 cm from the cylinder surface for dose verification. A second phantom was engineered as a clinically relevant sized indexed frame (12 cm x 10 cm x 5 cm) with seven OSLD positions and an optional Gafchromic film holder, to support a Geneva applicator with needles in a water-bath for end-to-end testing. A third insertion phantom was fabricated with eight OSLDs embedded in gel at 1–2 cm parallel to the tandem plane of an assembled Venezia applicator with vaginal caps.

Results: All three phantoms were used for end-to-end workflow testing and dose verification. Dose deviation was observed to be between 2.6%-10.2%, for all points measured using the SCVC and Geneva phantoms. In addition, the phantoms were used multiple times by the radiation therapists to practice workflow steps mimicking a phantom-applicator insertion, in this regard, the SCVC and Venezia gel-phantoms were used for facilitating the ease of clinical set-ups.

Conclusion: A 3D-printer is valuable tool that can be used to create simple reusable phantoms for Brachytherapy dose verification in tissue-equivalent media with reasonable accuracy. Additionally, these phantoms can play an important role in repeated imaging workflow testing, personnel training and practice and workflow optimization.

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Keywords

HDR

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Not Applicable / None Entered.

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