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Dose Size and Dosing Frequency: Determination Methods01:21

Dose Size and Dosing Frequency: Determination Methods

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Determining the optimal dose size and dosing frequency in pharmacotherapy is crucial for achieving therapeutic effectiveness while minimizing adverse effects. This article explores the methodologies employed in determining these parameters, focusing on their significance and interplay to tailor dosing regimens.Dose Size: Dose size refers to the amount of a drug administered in a single dose. It is determined based on the drug's pharmacodynamics and pharmacokinetics properties and...
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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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使用增强的叶子建模的Acuros剂量计算算法的有效点尺寸参数:基于小矩形MLC字段的估计.

Antonella Fogliata1, Antonella Stravato2,3, Marco Pelizzoli1

  • 1Radiotherapy and Radiosurgery Department, Humanitas Research Hospital IRCCS, Milan-Rozzano, Italy.

Journal of applied clinical medical physics
|November 7, 2025
PubMed
概括
此摘要是机器生成的。

在Acuros剂量计算算法中优化有效点尺寸 (ESS) 参数可以提高立体辐射疗法中小,长长的场的准确性. 这项研究提出了一种ESS确定方法,增强了多叶聚合器形状场的剂量计算.

关键词:
美国的Acuros Acuros有效的现货大小.输出因素是输出因素.长方形的小田野是一个矩形的小田野.小小的田地 小小的田地

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科学领域:

  • 医学物理 医学物理
  • 放射治疗 物理 物理
  • 剂量测量方法 剂量测量方法

背景情况:

  • 小场剂量测量对于立体辐射疗法至关重要,特别是在多叶聚合器 (MLC) 中.
  • 精确的剂量计算对于小的,延长的领域是具有挑战性的.
  • 使用增强的叶子建模 (ELM) 的Acuros剂量计算算法 (Eclipse v18.0) 需要优化有效点尺寸 (ESS) 参数.

研究的目的:

  • 为Acuros剂量计算算法优化有效点尺寸 (ESS) 参数.
  • 为了实现精确的剂量计算,通过MLCs.形状的小,矩形场.
  • 评估ESS对现场输出因子和小场的半阴影的影响.

主要方法:

  • 测量场输出因子 (FOFs) 使用Varian TrueBeam与HD-MLC用于6 MV和10 MV光束.
  • 利用基于TRS-483协议的ESS优化微钻探器.
  • 计算了Eclipse v18.0中的FOF与Acuros,改变ESS值以最大限度地减少与延长场 (0.5x4 cm2和4x0.5 cm2) 的测量差异.

主要成果:

  • 与默认设置相比,优化ESS参数显著提高了延长字段计算剂量的准确性.
  • 将计算和测量FOF之间的差异最小化,提高整体剂量计算精度.
  • 形状和半阴分析证实了改进的准确性.

结论:

  • 在Eclipse v.18中增强的叶子建模 (ELM) 改进了MLC建模,但ESS参数仍然是用户可调的.
  • 为Acuros算法成功开发和验证了一种确定ESS的方法.
  • 优化的ESS配置可确保对HD-MLC产生的小,长长的场进行准确的剂量计算,结果在0.2%±0.4%的测量范围内.