Biggs P J, Wang C C
Int J Radiat Oncol Biol Phys. 1982 Jul;8(7):1251-6. doi: 10.1016/0360-3016(82)90077-3.
A set of intra-oral cones has been constructed for electron beam therapy from a linear accelerator. We have modified the 4 cm X 4 cm treatment accessory provided with this machine by simply removing the lower collimator and replacing it with a brass plate into which all the cones can fit, so that they are easily interchangeable. Six circular cones, with diameters ranging from 27 mm and to 45 mm, plus two elliptical cones are currently in use. A light field system has been built that fits into the acrylic compartment directly above the base, and provides a clear, well-illuminated view of the treatment field. The dosimetry for these cones shows that the percent depth dose curve for a 41 mm diameter field is the same as that obtained with the 4 cm X 4 cm treatment accessory, and that the isodose curves are very similar. This intra-oral cone system has been in operation for over two years and we have found it very useful in boosting the dose to specific primary lesions in the oral cavity, for example, oral tongue, floor of mouth, retromolar trigone, and soft palate.
已为直线加速器的电子束治疗构建了一套口腔内锥形器。我们对该机器配备的4厘米×4厘米治疗附件进行了改装，只需移除下部准直器，并用一块所有锥形器都能适配的黄铜板替换它，这样它们就可以轻松互换。目前正在使用六个直径从27毫米到45毫米的圆形锥形器，外加两个椭圆形锥形器。已构建了一个光场系统，该系统可安装在基座正上方的丙烯酸隔间内，能清晰、照亮良好地显示治疗野。这些锥形器的剂量测定表明，直径41毫米射野的百分深度剂量曲线与使用4厘米×4厘米治疗附件获得的曲线相同，等剂量曲线也非常相似。这套口腔内锥形器系统已运行两年多，我们发现它在提高对口腔特定原发病变（如口腔舌、口底、磨牙后三角和软腭）的剂量方面非常有用。
