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相关概念视频

Region of Convergence of Laplace Tarnsform01:20

Region of Convergence of Laplace Tarnsform

586
The Region of Convergence (ROC) is a fundamental concept in signal processing and system analysis, particularly associated with the Laplace transform. The ROC represents an area in the complex plane where the Laplace transform of a given signal converges, determining the transform's applicability and utility.
Consider a decaying exponential signal that begins at a specific time. When deriving its Laplace transform, the time-domain variable is replaced with a complex variable. This...
586
Superposition Theorem for AC Circuits01:13

Superposition Theorem for AC Circuits

694
Consider encountering a circuit in a steady state where all its inputs are sinusoidal, yet they do not all possess the same frequency. Such a circuit is not classified as an alternating current (AC) circuit, and consequently, its currents and voltages will not exhibit sinusoidal behavior. However, this circuit can be analyzed using the principle of superposition.
The principle of superposition stipulates that the output of a linear circuit with several concurrent inputs is equivalent to the...
694

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相关实验视频

Updated: Jul 18, 2025

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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Published on: July 19, 2016

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崩的圆叠加算法验证胸壁的触角场使用虚拟子过器.

Ahad Zeinali1, Mikaeil Molazadeh2, Samaneh Ganjgahi1

  • 1Department of Medical Physics, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran.

Journal of medical signals and sensors
|August 25, 2023
PubMed
概括
此摘要是机器生成的。

虚拟形 (VW) 放射治疗确保了均的剂量分配. 这项研究验证了崩的圆叠加 (CCS) 算法.

关键词:
薄膜剂量计 薄膜剂量计玛指数 玛指数 玛指数治疗规划系统的系统规划虚拟形是一个虚拟形.

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Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph
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相关实验视频

Last Updated: Jul 18, 2025

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph
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Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph

Published on: February 21, 2025

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科学领域:

  • 医学物理 医学物理
  • 辐射瘤学 辐射瘤学

背景情况:

  • 虚拟 (VW) 在放射治疗中对于均的剂量分配至关重要,特别是在乳房切除术后的胸壁治疗中.
  • 准确的剂量计算对于治疗计划系统 (TPS) 的质量保证至关重要.
  • TECDOC-1583 和技术报告系列编号. 430强调需要评估剂量计算的准确性.

研究的目的:

  • 在虚拟形 (VW) 场中评估崩的形叠加 (CCS) 算法的剂量计算准确性,用于乳腺癌胸壁的乳腺切除术后放射治疗.
  • 使用ISOgray TPS在异质幻影中比较计算和测量剂量.

主要方法:

  • 使用ISOgray TPS.在胸部幻影中规划了两个具有虚拟形 (VW) 角度的触角场.
  • 收缩叠加 (CCS) 算法用于用6和15 MV光子束进行剂量计算.
  • 用马指数评估剂量分布,将EBT3膜测量与TPS计算进行比较.

主要成果:

  • 使用VW在异质介质中计算和测量剂量显示出良好的一致性 (88.0%-93.4%的接受率).
  • 剂量计算没有受到角变化的显著影响.
  • 在ISOgray TPS中,软组织剂量被高估,肺部剂量被低估.

结论:

  • 崩的叠加 (CCS) 算法,当与虚拟形 (VW) 模型在异质环境中使用时,可以在可接受的范围内提供剂量分布.
  • 玛指数分析证实了CCS算法的临床可接受性.