The present study aimed to dosimetrically evaluate the small-fields of a 6 MV flattening filter-free (FFF) photon beam using different detectors.The 6 MV FFF photon beam was used for measurement of output factor, depth dose, and beam profile of small-fields of sizes 0.6 cmנ0.6 cm to 6.0 cmנ6.0 cm. The five detectors used were SNC125c, PinPoint, EDGE, EBT3, and TLD-100. All measurements were performed as per the International Atomic Energy Agency TRS 483 protocol. Output factors measured using different detectors as direct reading ratios showed significant variation for the smallest fields, whereas after correcting them according to TRS 483, all sets of output factors were nearly compatible with each other when measurement uncertainty was also considered. The beam profile measured using SNC125c showed the largest penumbra for all field sizes, whereas the smallest was recorded with EDGE. Compared with that of EBT3, the surface dose was found to be much higher for all the other detectors. PinPoint, EBT3, TLD-100, and EDGE were found to be the detector of choice for small-field output factor measurements; however, PinPoint needs special attention when used for the smallest field size (0.6 cmנ0.6 cm). EDGE and EBT3 are optimal for measuring beam profiles. EBT3, PinPoint, and EDGE can be selected for depth dose measurements, and EBT3 is suitable for surface dose estimation.

本研究旨在使用不同的探测器对 6 MV 平坦无滤波器 (FFF) 光子束的小场进行剂量学评估。 6 MV FFF 光子束用于测量小尺寸的输出因子、深度剂量和光束轮廓。 -大小为 0.6 cmנ0.6 cm 到 6.0 cmנ6.0 cm 的田地。使用的五个检测器是 SNC125c、PinPoint、EDGE、EBT3 和 TLD-100。所有测量均按照国际原子能机构 TRS 483 协议进行。使用不同探测器作为直读比测量的输出因子显示出最小视场的显着变化，而在根据 TRS 483 对其进行校正后，当还考虑测量不确定性时，所有输出因子集几乎彼此兼容。使用 SNC125c 测量的光束轮廓显示了所有场尺寸的最大半影，而最小的则是用 EDGE 记录的。与 EBT3 相比，发现所有其他探测器的表面剂量要高得多。PinPoint、EBT3、TLD-100 和 EDGE 被发现是小场输出因子测量的首选检测器；但是，PinPoint 在用于最小场地尺寸 (0.6 cm/0.6 cm) 时需要特别注意。EDGE 和 EBT3 是测量光束轮廓的最佳选择。深度剂量测量可选择EBT3、PinPoint和EDGE，EBT3适用于表面剂量估计。PinPoint 在用于最小场地尺寸 (0.6 cm/0.6 cm) 时需要特别注意。EDGE 和 EBT3 是测量光束轮廓的最佳选择。深度剂量测量可选择EBT3、PinPoint和EDGE，EBT3适用于表面剂量估计。PinPoint 在用于最小场地尺寸 (0.6 cm/0.6 cm) 时需要特别注意。EDGE 和 EBT3 是测量光束轮廓的最佳选择。深度剂量测量可选择EBT3、PinPoint和EDGE，EBT3适用于表面剂量估计。