Parwaie Wrya, Refahi Soheila, Ardekani Mahdieh Afkhami, Farhood Bagher
Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
Department of Medical Physics, Faculty of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran.
J Med Signals Sens. 2018 Jul-Sep;8(3):195-203. doi: 10.4103/jmss.JMSS_3_18.
With the advent of complex and precise radiation therapy techniques, the use of relatively small fields is needed. Using such field sizes can cause uncertainty in dosimetry; therefore, special attention is required both in dose calculations and measurements. There are several challenges in small-field dosimetry such as the steep gradient of the radiation field, volume averaging effect, lack of charged particle equilibrium, partial occlusion of radiation source, beam alignment, and unable to use a reference dosimeter. Due to these challenges, special dosimeters are needed for small-field dosimetry, and this review article discusses this topic.
随着复杂而精确的放射治疗技术的出现，需要使用相对较小的射野。使用这样的射野尺寸会导致剂量测定的不确定性；因此，在剂量计算和测量中都需要特别注意。小射野剂量测定存在几个挑战，如辐射野的陡峭梯度、体积平均效应、缺乏带电粒子平衡、辐射源的部分遮挡、射束对准以及无法使用参考剂量计。由于这些挑战，小射野剂量测定需要特殊的剂量计，本文献综述将讨论这一主题。
