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首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >Does 4MV perform better compared to 6MV in the presence of air cavities in the head and neck region?
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Does 4MV perform better compared to 6MV in the presence of air cavities in the head and neck region?

机译：在头部和颈部存在气孔的情况下，4MV是否比6MV更好？

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摘要

BACKGROUND AND PURPOSE: The underdose near air cavities in the head and neck region at photon energies of 4 MV and 6 MV was studied in search for clinical advantages of the 4 MV over 6 MV treatments. MATERIALS AND METHODS: The on-axis and off-axis dose distributions were measured with a parallel-plate ionization chamber and films in polystyrene phantoms containing an air cavity of appropriate size based on the results of computed tomography scans. RESULTS: Although most results are similar for both energies, the 4 MV photon beams give a somewhat smaller underdose effect and a faster re-build up than the 6 MV. For both energies a significant underdose effect was observed at the edge of the field in the larynx phantom. This proved to be true for small and large fields, for smaller and larger cavities, for one-beam as well as parallel-opposed beams. CONCLUSION: For most clinically relevant situations there is no remarkable benefit in the use of either of the two energies.
机译：背景与目的：研究了在4 MV和6 MV光子能量下头部和颈部区域近气孔不足的情况，以寻求4 MV优于6 MV治疗的临床优势。材料与方法：使用平行板电离室和轴心和轴外剂量分布，基于计算机断层扫描的结果，测量聚苯乙烯模型中包含适当尺寸气腔的薄膜。结果：尽管两种能量的大多数结果相似，但与6 MV相比，4 MV光子束的剂量不足效应较小，重建速度更快。对于这两种能量，在喉体模的视野边缘都观察到了明显的剂量不足效应。事实证明，这对于大大小小的场，越来越大的空腔，一个光束以及平行光束都适用。结论：对于大多数临床相关情况，使用两种能量中的任何一种都没有显着的益处。

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