用于二极管探测器的立体定向准直器的射野输出校正因子：取决于准直器尺寸、测量设置、参考射野大小和光子能量。
Field output correction factors of stereotactic cones for a diode detector: Dependence on cone size, measurement setup, reference field size and photon energy.
作者信息
Lee Yongsook C, Kim Yongbok
机构信息
Department of Radiation Oncology, Miami Cancer Institute, Baptist Health South Florida, Miami, FL 33176, USA.
Department of Radiation Oncology, Duke University, Durham, NC 27710, USA.
出版信息
J Radiosurg SBRT. 2022;8(2):127-136.
This study investigated if field output correction factors (FOCFs) of Varian stereotactic cones for Edge detectorTM had dependence on cone size, measurement setup, reference field size and/or photon energy. Field output factors (FOFs) of stereotactic cones were measured at three depths (1.5 cm, 5 cm and 10 cm) in two different setups (source-to-surface distance (SSD) and source-to-axis distance (SAD)) with two photon energies (6 MV and 6 MV flattening filter free) using the Edge detector and Exradin W2 scintillator. Two reference fields (10 × 10 cm and 4 × 4 cm) were chosen. FOCFs for the Edge detector were determined by calculating FOF/FOF and compared among cones and between depths, setups, reference fields and energies. It is concluded that FOCFs for the Edge detector have dependence on cone size, SSD/SAD setup and energy for small cones, but do not have dependence on depth and reference field size.
本研究调查了瓦里安立体定向准直器用于Edge detectorTM的射野输出校正因子（FOCF）是否依赖于准直器尺寸、测量设置、参考射野大小和/或光子能量。使用Edge探测器和Exradin W2闪烁体，在两种不同设置（源皮距（SSD）和源轴距（SAD））下，于三个深度（1.5 cm、5 cm和10 cm），对两种光子能量（6 MV和6 MV无均整器）测量立体定向准直器的射野输出因子（FOF）。选择了两个参考射野（10×10 cm和4×4 cm）。通过计算FOF/FOF来确定Edge探测器的FOCF，并在不同准直器之间以及深度、设置、参考射野和能量之间进行比较。得出结论：Edge探测器的FOCF对于小准直器依赖于准直器尺寸、SSD/SAD设置和能量，但不依赖于深度和参考射野大小。
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