Arisha Iqbal, Dr. Kareem Bhutto Bukhsh, Hamid Jameel, Sindh Institute of Urology and Transplantation
INTRODUCTION
The evolution of radiation therapy, marked by the advent of highly conformal delivery systems, necessitates a paradigm shift in patient-specific quality assurance (PSQA). The technological strides in PSQA devices, exemplified by the Dolphin Phantom employed in this study, enable prospective evaluation of radiation safety prior to treatment delivery, thereby directly influencing patient outcomes and survival rates. The Dolphin® Compass system, a dosimetry solution, manifests versatility in executing diverse radiation treatment quality assurance protocols.
METHOD & MATERIAL
A retrospective analysis of 10 prostate cancer cases was conducted to assess treatment delivery accuracy. Offline treatment monitoring employed the Dolphins Phantom affixed to the Versa-HD Linear Accelerator head. Volumetric Modulated Radiation Treatment (VMAT) plans, utilizing 6 MV photon beams, were orchestrated using the Monaco® Treatment Planning System (version 5.11). The Compass, 3D volumetric gamma analysis software, facilitated the comparison of planned and measured doses.
RESULT
Analysis of 3D volumetric gamma pass rates, in contrast to 3D planner pass rates, demonstrated commendable concordance with corresponding Treatment Planning System (TPS) calculated values across all prostate VMAT plans delivered.
CONCLUSION
A careful examination of 10 VMAT cases was conducted to assess the Dolphin-Compass dosimetry’s capacity to replicate 3D dosage on patient CT scans. Leveraging Versa HD LINAC- modeled beam data, the dosimetry system was deployed. The findings accentuate the reliability and precision of the Dolphin® Phantom in elevating quality assurance for prostate VMAT treatments. Implementation of the Dolphin® -Compass system ensures congruence between delivered and planned doses, solidifying its pivotal role as an invaluable tool in advancing patient-specific quality assurance within the realm of radiation therapy.