ESTRO 2024 - Abstract Book

S4814

Physics - Quality assurance and auditing

ESTRO 2024

1396

Poster Discussion

Commissioning of a Novel Gantry-Less and Synchrotron-Based Proton Therapy System

Alexander Pryanichnikov 1,2 , Jon Feldman 3 , Alejandro Achkienasi 1 , Ilya Polyansky 1 , Yair Hillman 3 , Stas Raskin 3 , Philip Blumenfeld 3 , Aron Popovtzer 3 , Michael Marash 4 1 P-Cure, R&D, Shilat, Israel. 2 DKFZ, Division of Biomedical Physics in Radiation Oncology, Heidelberg, Germany. 3 Hadassah Medical Center, Sharett Institute of Oncology, Jerusalem, Israel. 4 P-Cure, Board, Shilat, Israel

Purpose/Objective:

The objective of this contribution is to describe the configuration, testing, and commissioning of a novel gantry-less synchrotron-based pencil beam scanning intensity modulated proton therapy (IMPT) facility located in a compact linac single-room vault.

Material/Methods:

The P-Cure Proton Therapy System offers beams covering a water equivalent range spanning from 4.08 cm to 37.94 cm across a spectrum of 1900 discrete energy levels. It also has the versatility to extend this range up to 60.2 cm, specifically for proton imaging applications. This compact system maintains a fixed beam delivery configuration, allowing for a maximum field size of 32 cm × 32 cm. The gantry-less beam delivery is complemented by an innovative patient robotic positioning and imaging system (P-ARTIS) that provides unparalleled flexibility in patient orientation, accommodating positions from near horizontal to near vertical (see Figure 1).

Figure 1. The P-Cure proton therapy system installed in P-Cure Research and Clinical Center, Shilat, Israel.

The accuracy of spot positioning and profile alignment was rigorously evaluated using a variety of independent devices and methods. These included the use of integrated positioning sensors, the IBA Lynx, and the use of Gafchromic EBT3 films. In addition, the system's performance was characterized by the acquisition of Integrated Depth Dose Curves (IDDs) and the precise measurement of absolute dose values. This was achieved through the use