ESTRO 2023 - Abstract Book

S1832

Digital Posters

ESTRO 2023

Fig. 2

Conclusion For SIMT SRS treatment plans using Elements MBM v3.0, 5-mm MLC performed similarly to HDMLC for targets with diameter > 0.8 cm. For smaller targets with diameters ≤ 0.8 cm, compared to 5-mm MLC, HDMLC resulted in significantly improved CI but similar V12Gy and mean brain dose.

PO-2056 CHHiP planning improvement tools

M. Gomes 1 , S. Williams 2

1 GenesisCare UK, Medical Physics, Newmarket, United Kingdom; 2 GenesisCare UK, Medical Physics, Portsmouth, United Kingdom Purpose or Objective Prostate cancer is the most common cancer in males in the UK and the CHHiP technique continues to be a standard of care. At GenesisCare a scripted CHHiP protocol (class solution) had been setup for treatment planning using volumetric modulated arc therapy (VMAT). It was noticed that the Script produced acceptable target and organs-at-risk (OARs) doses, however, wider quality aspects as Conformity index (CI) and gradient index (GI), varied most among planners and lacked an objective measure within the TPS. This project describes a quality improvement model to develop an objective, class solution template for CHHiP specific prostate VMAT plans: 1. Develop an objective scoring tool to benchmark plan quality, considering multiple plan criteria.