Author: Fitria P Krisna, Mardon Limena, Supriyanto Ardjo Pawiro, Jhon H Saragih, Wahyu E. Wibowo, Poonam Yadav, Ummu M Zahro 👨🔬
Affiliation: Northwestern Memorial Hospital, Northwestern University Feinberg School of Medicine, Radiation Oncology Dr. Cipto Mangunkusumo National Central Public Hospital, Department of Physics, Mathematics and Natural Sciences, University of Indonesia, Department of Radiotherapy, Mandaya Hospital, Department of Radiation Oncology, Mitra Keluarga Kenjeran Hospital, Department of Radiotherapy, Mandaya Royal Hospital, Radiation Oncology, Santosa Hospital 🌍
Purpose: To perform depth dose characteristics of High Dose Electron Beam and utility of various commercially available detectors.
Methods: The measurements were performed using an Elekta Versa HD with the standard electron beam and High Dose Rate Electron (HDRE) of 6 MeV and 10 MeV, respectively. We used ionization detectors from PTW, such as Semiflex, Roos, and PinPoint, to measure the depth dose with different gantry angles and SSD setups. The gantry angles used are 0o, 15o and 345o with 100 cm and 110 cm Source to Skin Distance (SSD) setup using a 3D beam scanner from PTW (water phantom). We compared the depth dose measurement criteria such as Rp, R50, R80, and Ep0 as beam characterizations between the HDRE beam and the standard electron beams using MEPHYSTO software.
Results: A comparative measurement was conducted between the standard high-energy electron beam and the HDRE and the beam characterization results were analyzed. The highest differences for 6 MeV are 0.32 mm, 0.342 mm, 0.39 mm, and 0.065 MeV for Rp, R50, R80, and Ep0 at the Semiflex chamber. Whereas for 10 MeV, it is 1.07 mm, 0.765 mm, 0.535 mm, and 0.215 MeV for Rp, R50, R80, and Ep0, respectively, at Roos chamber. The Roos chamber shows a superior (highest) difference among others with gantry angle 345o and 15o for 10 MeV.
Conclusion: Based on the result, all the beam characterizations differ slightly. HDRE therapy using systems like the Elekta Versa HD represents a significant advancement in radiation oncology. Furthermore, the HDRE therapy beam can be used as an alternative electron beam in special clinical situations, allowing for faster, more accurate treatments. Continued research and clinical practice will further elucidate its benefits and optimize its application in radiation therapy.