Siddon R L, Chin L M, Zimmerman R E, Mendel J B, Kaplan W D
Int J Radiat Oncol Biol Phys. 1982 Jun;8(6):1059-63. doi: 10.1016/0360-3016(82)90178-x.
In radiation therapy of patients with breast carcinoma, the ipsilateral internal mammary lymph nodes are either irradiated by a separate anterior field or included by isocentric opposing tangential fields, which also treat the breast and chest wall. To determine the acceptability of a particular treatment setup, the positions of the nodes must be determined with respect to the treatment fields. For the anterior field technique the problem is two-dimensional and is solved by simply superimposing the treatment field onto an anterior lymphoscintigram. For treatment by opposing tangential fields the problem is three-dimensional and more complex. The solution described in this note is to project the three-dimensional lymph node positions, obtained by a stereo-lymphoscintigraphic procedure, onto the tangential field radiographs. A mathematical expression is given to perform the required projection of the node positions onto the radiographs.
在乳腺癌患者的放射治疗中，同侧内乳淋巴结要么通过单独的前野照射，要么包含在等中心对置切线野中，切线野同时也用于治疗乳房和胸壁。为了确定特定治疗设置的可接受性，必须相对于治疗野确定淋巴结的位置。对于前野技术，问题是二维的，通过简单地将治疗野叠加在前淋巴闪烁造影片上即可解决。对于对置切线野治疗，问题是三维的且更复杂。本说明中描述的解决方案是将通过立体淋巴闪烁造影程序获得的三维淋巴结位置投影到切线野X线片上。给出了一个数学表达式，用于将淋巴结位置投影到X线片上。
