Scher N, Poe D, Kuchnir F, Reft C, Weichselbaum R, Panje W R
Department of Otolaryngology-Head and Neck Surgery, University of Chicago Medical Center, IL 60637.
Laryngoscope. 1988 May;98(5):561-3. doi: 10.1288/00005537-198805000-00017.
There is general concern among otolaryngologists that irradiation of a stainless steel prosthesis used in mandibular reconstruction may cause irradiation overdosage to adjacent tissues. A tissue-equivalent plastic/steel model, simulating the characteristics of a stainless steel, reconstructed mandible, was irradiated and measurements were made with a parallel plate ionization chamber. The results of our measurements show that irradiation of an implanted steel plate results in an overdosage (120%) "in front" and an underdosage (80%) "behind" the steel plate. The regions of overdosage and underdosage are 2 to 3 mm thick. The overall dose modification is greatly reduced when two opposing fields are used. We conclude that irradiation of a stainless steel, reconstructed mandible with a 6-mV photon beam through opposing fields does not significantly alter the amount of radiation delivered to surrounding tissues.
耳鼻喉科医生普遍担心，用于下颌骨重建的不锈钢假体的照射可能会导致相邻组织的照射剂量过量。构建了一个模拟不锈钢重建下颌骨特征的组织等效塑料/钢模型，对其进行照射，并使用平行板电离室进行测量。我们的测量结果表明，植入钢板的照射会导致钢板“前方”剂量过量（120%）和钢板“后方”剂量不足（80%）。剂量过量和不足区域的厚度为2至3毫米。当使用两个相对的照射野时，整体剂量修正会大大降低。我们得出结论，通过相对照射野用6兆伏光子束照射不锈钢重建下颌骨，不会显著改变传递到周围组织的辐射量。
