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VMAT和IMRT技术在鼻咽癌放疗海马保护中可行性研究

时间:2022-03-13 09:38:12 公文范文 浏览量:

  [摘要] 目的 研究静态调强技术和容积旋转调强治疗技术在治疗鼻咽癌时对海马区的物理剂量学的差异性。 方法 对2016年5~11月入院的10例鼻咽癌患者采用:①容积旋转调强治疗技术V-MAT-HF(对海马区有剂量限制);②容积旋转调强治疗技术V-MAT(对海马区不作剂量限制);③9野静态调强计划9B-IMRT-HF(对海马区有剂量限制);④9野静态调强计划9B-IMRT(对海马区不作剂量限制),记录各患者靶区适形性CI、剂量均匀性HI脑海马区HF的放射剂量,统计剂量学差异。 结果 鼻咽癌患者靶区容积旋转调强技术(保护脑海马区)对脑海马区的剂量低于其他三种治疗技术,其差异有统计学意义(P<0.05);行保护性照射的容积调强技术对脑海马区HF受照剂量远远低于其他三种治疗技术,差异有统计学意义(P<0.05)。 结论 10例鼻咽癌患者靶区容积旋转调强技术(保护脑海马区)对脑海马区的剂量明显低于其他三种治疗技术,VMAT保护海马区技术可以认为是鼻咽癌患者放射治疗的首选治疗技术。
  [关键字] 鼻咽癌;常规9野静态调强治疗;容积旋转调强治疗;脑海马区放射剂量
  [中图分类号] R730.5 [文献标识码] B [文章编号] 1673-9701(2018)08-0079-03
  Radiate dosimetry of volumetric modulated therapy on hippocampus in nasopharyngeal carcinoma
  XIONG Chao YE Wei WANG Lu GONG Minyong
  Cancer Center, Jiujiang First People"s Hospital, Jiujiang inJiangxi Province, Jiujiang 333200,China
  [Abstract] Objective To study the differences of physical dosimetry and biological indicators of hippocampus in the treatment of nasopharyngeal carcinoma by different volumetric modulated arc therapies (V-MAT). Methods ①V-MAT-HF (dose-limiting for hippocampus), ②V-MAT (no dose-limiting for hippocampus), ③ 9-field intensity modulated radiation therapy-HF(9B-IMRT-HF) (dose-limiting for hippocampus) and ④9B-IMRT (no dose limitation for hippocampus) were used in 10 cases of nasopharyngeal carcinoma admitted from May 2016 to November 2016 in our hospital. Conformal index(CI), Homogeneity index (HI) and radiation dose of HF in brainstem, spinal cord and hippocampus were recorded. Results The doses of V-MAT-HF(dose-limiting for hippocampus) to the hippocampus in patients with nasopharyngeal carcinoma were significantly lower than those of the other three therapeutic techniques(P<0.05); HF dose to hippocampus of V-MAT with protective radiation was much lower than the other three techniques(P<0.05). Conclusion The dose of V-MAT (protecting the hippocampus) of 10 patients with nasopharyngeal carcinoma is significantly lower than that of the other three therapeutic techniques. V-MAT which protects hippocampus can be considered as the preferred treatment of radiation therapy for patients with nasopharyngeal carcinoma.
  [Key words] Nasopharyngeal carcinoma; Conventional 9-field intensity modulated radiation therapy; Volumetric modulated arc therapy; Radiation dose of hippocampus
  放射治療是鼻咽癌综合治疗中重要的治疗方法,研究证实部分鼻咽癌患者接受放疗一段时间后出现言语能力下降、记忆力受损、神经认知功能下降等生活质量降低的表现[1-2],而越来越多的研究显示海马区损伤是神经认知功能障碍的主要原因。目前鼻咽癌放射治疗多采用9野调强技术和容积旋转调强技术,在治疗患者的同时是否能有效降低脑海马区放射剂量、减少放疗损伤却少有文献报道[3]。本研究分别采用VAMT和IMRT设计保护或不保护海马的两种计划,研究鼻咽癌放疗时海马保护的可行性,现报道如下。

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