Dosimetric Investigation of Modulation Capabilities of a Novel Rotating Gamma Ray System

Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, PA, USA

Corresponding Author:  Eldib A, Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, PA, USA; Email: [email protected]

Received Date: October 13, 2023

Publication Date: November 8, 2023

Citation: Eldib A, et al. (2023). Dosimetric Investigation of Modulation Capabilities of a Novel Rotating Gamma Ray System. Mathews J Cancer Sci. 8(3):47.

Copyright: Eldib A, et al. © (2023)

ABSTRACT

Background: Novel gamma systems with a ring type gantry capable of delivering oblique arcs have been developed recently. The expectation is that rotational systems not only reduce the number of sources utilized but can also introduce better shot modulation as compared to earlier gamma machines, which provides additional dosimetric benefits in the treatment planning process. Purpose: The aim of this work is to investigate the new optimization capabilities with a novel rotating gamma ray system (RGS). Methods: The CybeRay system is an RGS that rotates 360° in the axial direction and swings 35° in the superior direction. It includes 16 Co-60 sources focusing on the isocenter. A commercial treatment planning system was used for treatment planning with CybeRay and an in-house Monte Carlo based system was used for phantom studies. The various shot modulation options gained with this novel system were evaluated together with a simple method for dynamic dose rate delivery to overcome limitations of such rotating designs. Results: Shot modulation methodology has been evaluated in different phantoms using Monte Carlo simulations and an in-house developed graphical user interphase program. It demonstrated that one shot with weighted sectors can achieve the same coverage/conformity index as that obtained with multiple shots. This also resulted in a reduction in delivery time by 55% based on our results. The proper combination of available collimator cone sizes and various oblique beam angles allows RGS to shape the isodose lines effectively to match the target volume. Conclusion: The novel rotational system extended the gamma system capabilities in searching for the best treatment plans.