Transfer of Fractionated Treatment Plans from Ring-Gantry to L-Shaped Linacs Using Fluence Map Convolution
Discuss this preprint
Start a discussion What are Sciety discussions?Listed in
This article is not in any list yet, why not save it to one of your lists.Abstract
Background: Transferring treatment plans from a ring-gantry Ethos system to a standard L-shaped linear accelerator (linac), such as TrueBeam, is often a time-consuming and labor-intensive process, requiring repeated optimization steps. Objective: This study proposes a novel method for converting Ethos plans to TrueBeam plans using Fluence Map Generation (FMG) based on a fluence map convolution approach, intended to minimize treatment delays in the event of Ethos downtime. Material and Method: The FMG method comprises three key steps: determining an optimal convolution kernel, generating fluence maps from Ethos plans, and applying 2D convolution to simulate corresponding TrueBeam fluence maps. Forty original Ethos plans were used to validate the FMG approach, and the number of available fractions for each converted plan was evaluated. Results: The FMG method successfully generated a moderate number of convertible fractions, ranging from one to six. The FMG-generated plans showed comparable dose distributions between the cumulative dose (Ethos + TrueBeam) and the original Ethos plans. Conclusion: This FMG-based conversion strategy offers a practical solution for mitigating treatment interruptions and reducing the clinical workload associated with plan re-optimization.
