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相关概念视频

One-Compartment Model: IV Infusion01:09

One-Compartment Model: IV Infusion

Intravenous (IV) infusion is often utilized when continuous and controlled drug delivery is necessary, such as during surgery or in the treatment of chronic diseases. This method offers numerous advantages, including immediate drug action, precise control over dosage, and bypassing the first-pass metabolism.
The one-compartment model for IV infusion uses mathematical equations to describe the rate of change in drug quantity in the body. At steady-state or infusion equilibrium, the drug input...
Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations01:15

Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations

Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...
Determination of Multiple Dosing Parameters: Loading and Maintenance Doses01:25

Determination of Multiple Dosing Parameters: Loading and Maintenance Doses

A loading dose is an essential pharmacological strategy to rapidly achieve the target plasma drug concentration necessary for an immediate therapeutic effect. This approach is especially critical for drugs characterized by slow absorption or extended half-lives, where delaying therapeutic plasma levels could compromise treatment outcomes. By administering a loading dose, clinicians ensure a prompt onset of drug action, even for agents with complex pharmacokinetic profiles.Achieving steady-state...
IV Infusion to Oral Dosing: Conversion Methods01:28

IV Infusion to Oral Dosing: Conversion Methods

The development of extended-release formulations has facilitated the transition from intravenous to oral medication, offering a more convenient and patient-friendly approach to drug administration. This transition, however, requires careful management to ensure that therapeutic drug levels are maintained, preserving efficacy and avoiding adverse effects. Understanding pharmacokinetic principles and dosage calculations is critical during this process.Pharmacokinetics of the...
Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

Modified-Release Drug Delivery Systems: Rate-Programmed II

Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
Modified-Release Drug Delivery Systems: Rate-Programmed I01:22

Modified-Release Drug Delivery Systems: Rate-Programmed I

Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...

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相关实验视频

Updated: Jul 3, 2026

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
08:30

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脉冲参数优化器:一种高效的工具,可以通过电子FLASH平台实现规定的剂量和剂量速率.

S Jain1, A Cetnar1, J Woollard1

  • 1The Department of Radiation Oncology, The Ohio State University Wexner Medical Center, United States of America.

Physics in medicine and biology
|September 22, 2023
PubMed
概括

一个新的软件应用程序优化了电子FLASH疗法参数,提高了剂量和剂量速率递送的精度和效率. 这种工具可以自动计算,减少手工错误,并在超高剂量治疗过程中提高患者的安全性.

关键词:
一个闪光灯.电子UHDR是UHDR的一种方式.莫比特朗是什么意思优化的优化优化优化.

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相关实验视频

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08:30

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科学领域:

  • 医学物理 医学物理
  • 辐射瘤学 辐射瘤学
  • 放射治疗技术 放射治疗技术

背景情况:

  • 商业电子FLASH平台提供超高剂量速率,但需要精确的脉冲参数组合 (脉冲宽度,脉冲重复频率,脉冲数量) 来实现特定的剂量和剂量速率.
  • 使用电子表格手动确定这些参数是低效的,容易出现错误,特别是对于各种处理配置.

研究的目的:

  • 开发和验证用于优化电子FLASH治疗脉冲参数的软件应用程序.
  • 为了使预期的剂量和临床应用的剂量速率能够准确有效地匹配.

主要方法:

  • 为商业电子FLASH平台开发了一种剂量和剂量速率计算模型.
  • 一个受约束的优化问题在MATLAB中被定义为一个混合整数问题,它包含了像每脉冲剂量,脉冲宽度,脉冲重复频率和空隙因子这样的参数.
  • 用Gafchromic膜和交流电流变压器 (ACCT) 获取光束和机器数据.

主要成果:

  • 成功创建了一个软件应用程序,通过调整脉冲宽度,脉冲重复频率,脉冲数量和空隙因子来优化剂量和剂量速率.
  • 优化过程在20秒内趋同,实现与所需剂量和剂量速率尽可能接近的匹配.
  • 该软件证明了剂量计算的准确性和准确性在匹配处方剂量和剂量速率.

结论:

  • 已经开发了一个用于电子FLASH治疗的自动脉冲参数优化应用程序.
  • 这种工具显著提高了剂量,剂量速率和脉冲参数处方过程的效率.
  • 自动化减少了与手动计算相关的安全问题,这对于管理具有不同治疗参数的多个患者至关重要.