Khan F M, Higgins P D
Department of Radiation Oncology, Fairview University Medical Center, Minneapolis, MN 55455, USA.
Phys Med Biol. 2001 Jan;46(1):N9-14. doi: 10.1088/0031-9155/46/1/402.
The concept of field equivalence for electron beams is examined using a pencil beam theory applied to circular fields. It is shown that a circular field can be found for a field of any size, shape and energy for which the depth dose distribution is approximately equivalent. The usefulness of the concept in clinical dosimetry is discussed.
运用适用于圆形射野的笔形束理论来研究电子束的射野等效性概念。结果表明，对于任意大小、形状和能量的射野，都能找到一个深度剂量分布大致等效的圆形射野。文中还讨论了该概念在临床剂量学中的实用性。
