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相关概念视频

Actuarial Approach01:20

Actuarial Approach

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The actuarial approach, a statistical method originally developed for life insurance risk assessment, is widely used to calculate survival rates in clinical and population studies. This method accounts for participants lost to follow-up or those who die from causes unrelated to the study, ensuring a more accurate representation of survival probabilities.
Consider the example of a high-risk surgical procedure with significant early-stage mortality. A two-year clinical study is conducted,...
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Factors Affecting Activity Coefficient01:17

Factors Affecting Activity Coefficient

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The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size. 
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...
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Predicting Reaction Outcomes02:24

Predicting Reaction Outcomes

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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

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Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
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Two-Compartment Open Model: Extravascular Administration01:12

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The two-compartment model for extravascular administration represents a drug's absorption and distribution process. It features a central compartment, where the drug is first absorbed, and a peripheral compartment, which illustrates the drug's distribution throughout the body. The rate of change in drug concentration in the central compartment is calculated by three exponents: absorption, distribution, and elimination.
The absorption exponent (ka) indicates the speed at which the drug...
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The interval estimate of any variable is known as the prediction interval. It helps decide if a point estimate is dependable.
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Updated: Jul 28, 2025

Inverse Probability of Treatment Weighting Propensity Score using the Military Health System Data Repository and National Death Index
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预测净管理活动在

Eric C Henry1, Benjamin Lopez1, Armeen Mahvash2

  • 1Department of Imaging Physics, UT MD Anderson Cancer Center, Houston, Texas, USA.

Medical physics
|June 5, 2023
PubMed
概括
此摘要是机器生成的。

在90Y放射性栓塞中,精确测量净施用活性 (阿胺) 是至关重要的. 新型SPECT/CT成像可靠地预测玻璃和树脂微球的Aadmin,改善剂量测量和安全性.

关键词:
这是一个SIRT.在SPECT/CT测试中,伊特-90是一种.量化量化的量化量化量化的量化量化量.放射性栓塞是一种放射性栓塞.

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科学领域:

  • 核医学就是核医学.
  • 辐射物理学 辐射物理学
  • 医疗成像医学成像

背景情况:

  • 准确的净被施用活性 (Aadmin) 的确定对于90Y放射栓塞的剂量测量和辐射安全至关重要.
  • 目前用于测量残留90Y活性的方法往往具有很高的不确定性.
  • 需要一种临床上可行的方法来在不同的90Y微球器件中确定Aadmin.

研究的目的:

  • 开发和验证一种使用定量SPECT/CT成像来确定Aadmin的新方法.
  • 用玻璃或树脂微球测量90Y放射栓塞后的体内90Y排放.

主要方法:

  • 对147名接受90Y放射栓塞的患者的减弱校正90Y-SPECT/CT数据的分析.
  • 开发单变线性回归模型以基于SPECT计数预测Aadmin,分层按微球类型 (玻璃/树脂) 和SPECT体积 (FOV/VOIliver) 分层.
  • 使用培训和测试队伍对模型性能进行独立评估,并进行一次性交叉验证.

主要成果:

  • 对于微球类型和分析体积,90Y-SPECT计数和Aadmin之间的强正相关性 (R2>0.98).
  • 高精度 (>96.9%) 和精度 (<26.2%) 在预测玻璃和树脂微球的测试队列中的 Aadmin 中.
  • 在玻璃和树脂微球装置之间观察到活动校准的显著差异,树脂在每等效活动中产生更高的SPECT计数.

结论:

  • 90Y-SPECT/CT成像提供了一种可靠的方法来预测90Y放射栓塞后的阿德明,准确度>95%和精度<18%.
  • 该方法证明玻璃和树脂微球的性能相同.
  • 在玻璃和树脂90Y微球器件之间,活动校准过程显著不同.