Department of Radiation Oncology, Cerrahpaşa Medical Faculty, Istanbul University-Cerrahpaşa, Istanbul 34303, Türkiye.
Department of Radiotherapy, Vocational School of Health Services, Istanbul University-Cerrahpaşa, Istanbul 34265, Türkiye.
Medicina (Kaunas). 2023 Mar 21;59(3):628. doi: 10.3390/medicina59030628.
Quality assurance is an integral part of brachytherapy. Traditionally, radiographic films have been used for source position verification, however, in many clinics, computerized tomography simulators have replaced conventional simulators, and computerized radiography systems have replaced radiographic film processing units. With these advances, the problem of controlling source position verification without traditional radiographic films and conventional simulators has appeared. In this study, we investigated an alternative method for source position verification for brachytherapy applications. Source positions were evaluated using Gafchromic™ RTQA2 and EBT3 film and visually compared to exposed RTQA radiochromic film when using a Nucletron Oldelft Simulix HP conventional simulator and a Gammamed 12-i brachytherapy device for performance evaluation. Gafchromic film autoradiography was performed with a linear accelerator (LINAC) on-board imager (OBI). Radiochromic films are very suitable for evaluation by visual inspection with a LINAC OBI. The results showed that this type of low-cost, easy-to-find material can be used for verification purposes under clinical conditions. It can be concluded that source-position quality assurance may be performed through a LINAC OBI device.
质量保证是近距离放射治疗的一个组成部分。传统上，放射胶片已被用于源位置验证，然而，在许多临床中，计算机断层扫描模拟器已经取代了传统的模拟器，而计算机放射摄影系统已经取代了放射胶片处理单元。随着这些进步，出现了没有传统放射胶片和传统模拟器的情况下控制源位置验证的问题。在这项研究中，我们研究了近距离放射治疗应用中源位置验证的替代方法。使用 Gafchromic™ RTQA2 和 EBT3 胶片评估源位置，并在使用 Nucletron Oldelft Simulix HP 常规模拟器和 Gammamed 12-i 近距离放射治疗设备进行性能评估时，将其与暴露的 RTQA 放射色胶片进行视觉比较。Gafchromic 胶片自动射线照相术是在直线加速器（LINAC）上的成像仪（OBI）上进行的。放射色胶片非常适合使用 LINAC OBI 进行目视检查评估。结果表明，这种低成本、易于找到的材料可以在临床条件下用于验证目的。可以得出结论，通过 LINAC OBI 设备可以进行源位置质量保证。
