癌症补硒剂量(癌症患者补硒剂量)

硒宝 10-18 18:13 145次浏览

为了使用基于加速器的硼中子俘获疗法 (ABBNCT) 治疗浅表肿瘤,研究人员研究了一种技术,在此基础上,将单中子调制器放置在准直器内并用热中子照射。在大肿瘤中,边缘处的剂量减少。目的是产生均匀的治疗强度剂量分布。在这项研究中,我们开发了一种优化强度调制器形状和照射时间比的方法,以产生均匀的剂量分布来治疗各种形状的浅表肿瘤。开发了一种计算工具,该工具使用 424 种不同的源组合执行蒙特卡罗模拟。我们确定了具有最高最小肿瘤剂量的强度调制器的形状。还导出了评估均匀性的均匀性指数 (HI)。为了评估该方法的有效性,评估了直径为 100 毫米、厚度为 10 毫米的肿瘤的剂量分布。此外,使用 ABBNCT 系统进行辐照实验。对肿瘤剂量有相当大影响的热中子通量分布结果证实了实验和计算之间的良好一致性。此外,与使用单中子调制器的照射情况相比,最小肿瘤剂量和 HI 分别提高了 20% 和 36%。所提出的方法提高了最小肿瘤体积和均匀性。结果证明了该方法在 ABBNCT 中治疗浅表肿瘤的疗效。使用ABBNCT系统进行辐照实验。对肿瘤剂量有相当大影响的热中子通量分布结果证实了实验和计算之间的良好一致性。此外,与使用单中子调制器的照射情况相比,最小肿瘤剂量和 HI 分别提高了 20% 和 36%。所提出的方法提高了最小肿瘤体积和均匀性。结果证明了该方法在 ABBNCT 中治疗浅表肿瘤的疗效。使用ABBNCT系统进行辐照实验。对肿瘤剂量有相当大影响的热中子通量分布结果证实了实验和计算之间的良好一致性。此外,与使用单中子调制器的照射情况相比,最小肿瘤剂量和 HI 分别提高了 20% 和 36%。所提出的方法提高了最小肿瘤体积和均匀性。结果证明了该方法在 ABBNCT 中治疗浅表肿瘤的疗效。与使用单中子调制器的辐照情况相比。所提出的方法提高了最小肿瘤体积和均匀性。结果证明了该方法在 ABBNCT 中治疗浅表肿瘤的疗效。与使用单中子调制器的辐照情况相比。所提出的方法提高了最小肿瘤体积和均匀性。结果证明了该方法在 ABBNCT 中治疗浅表肿瘤的疗效。

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Development of optimization method for uniform dose distribution on superficial tumor in an accelerator-based boron neutron capture therapy system

To treat superficial tumors using accelerator-based boron neutron capture therapy (ABBNCT), a technique was investigated, based on which, a single-neutron modulator was placed inside a collimator and was irradiated with thermal neutrons。 In large tumors, the dose was reduced at their edges。 The objective was to generate a uniform and therapeutic intensity dose distribution。 In this study, we developed a method for optimizing the shape of the intensity modulator and irradiation time ratio to generate a uniform dose distribution to treat superficial tumors of various shapes。

A computational tool was developed, which performed Monte Carlo simulations using 424 different source combinations。 We determined the shape of the intensity modulator with the highest minimum tumor dose。 The homogeneity index (HI), which evaluates uniformity, was also derived。 To evaluate the efficacy of this method, the dose distribution of a tumor with a diameter of 100 mm and thickness of 10 mm was evaluated。 Furthermore, irradiation experiments were conducted using an ABBNCT system。 The thermal neutron flux distribution outcomes that have considerable impacts on the tumor’s dose confirmed a good agreement between experiments and calculations。

Moreover, the minimum tumor dose and HI improved by 20 and 36%, respectively, compared with the irradiation case wherein a single-neutron modulator was used。 The proposed method improves the minimum tumor volume and uniformity。 The results demonstrate the method’s efficacy in ABBNCT for the treatment of superficial tumors。