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Related Concept Videos

Criteria for Causality: Bradford Hill Criteria - II01:28

Criteria for Causality: Bradford Hill Criteria - II

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The Bradford Hill criteria serve as guidelines for establishing causative links in epidemiological research. Beyond Strength, Consistency, Specificity, and Temporality, key criteria also include Biological Gradient, Plausibility, Coherence, Experiment, and Analogy. These principles assist scientists in assessing the likelihood of causation in complex biological contexts. Below is a summary of these concepts:
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Criteria for Causality: Bradford Hill Criteria - I01:30

Criteria for Causality: Bradford Hill Criteria - I

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The Bradford Hill criteria are a group of principles that provide a framework to determine a causal relationship between a specific factor and a disease. There are nine criteria that are pivotal in assessing causality in epidemiological studies. Here's a closer look at Strength, Consistency, Specificity, and Temporality criteria with definitions and examples:
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Decision Making01:20

Decision Making

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Decision-making is a fundamental cognitive process that involves evaluating alternatives and selecting among them. This process can range from simple choices, such as deciding what to wear, to complex decisions, like choosing a major in college or a career path. The complexity of the decision often dictates the approach we use, which can be broadly categorized into two types: automatic and controlled decision-making.
Automatic decision-making is fast, intuitive, and relies on gut feelings...
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Decision Making: P-value Method01:09

Decision Making: P-value Method

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The process of hypothesis testing based on the P-value method includes calculating the P- value using the sample data and interpreting it.
First, a specific claim about the population parameter is proposed. The claim is based on the research question and is stated in a simple form. Further, an opposing statement to the claim  is also stated. These statements can act as null and alternative hypotheses:  a null hypothesis would be a neutral statement while the alternative hypothesis can...
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Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
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Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

Criteria for Aromaticity and the Hückel 4n + 2 Rule

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Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?  
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n +...
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Lung cancer brain metastases management at the dawn of personalized medicine: are we ready to break the barriers?

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Related Experiment Video

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Comparing the Frequency Effect Between the Lexical Decision and Naming Tasks in Chinese
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[Reirradiations: Which decision-making criteria?]

J-M Cosset1, C Chargari2, G Créhange3

  • 1SNC Charlebourg, groupe Amethyst, 92250 La-Garenne-Colombes, France.

Cancer Radiotherapie : Journal De La Societe Francaise De Radiotherapie Oncologique
|August 12, 2019
PubMed
Summary

Reirradiating previously irradiated areas is challenging. Decisions require assessing patient tolerance, historical treatment data, and utilizing advanced techniques like stereotactic radiotherapy for improved precision.

Keywords:
Intrinsic radiosensitivityRadiosensibilité individuelleRe-irradiationRéirradiationsStereotaxyStéréotaxie

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Area of Science:

  • Radiation Oncology
  • Medical Physics

Background:

  • Reirradiation decisions for previously irradiated volumes present significant challenges for radiation oncologists.
  • Accurate clinical and technological criteria are essential for making informed reirradiation decisions.

Purpose of the Study:

  • To outline the critical considerations and emerging technologies for reirradiation in radiation oncology.
  • To address the complexities faced by radiation oncologists when planning a second course of radiation therapy.

Main Methods:

  • Evaluation of clinical tolerance to a second irradiation, considering prior treatment, patient comorbidities, and intrinsic radiosensitivity.
  • Assessment of the availability and adequacy of technical data from the initial radiotherapy course.
  • Exploration of advanced radiation technologies for precise reirradiation delivery.

Main Results:

  • Patient tolerance is a primary concern, necessitating evaluation of prior irradiation, comorbidities, and radiosensitivity.
  • Availability of historical radiotherapy technical data can be a limitation, especially for treatments delivered years prior.
  • Modern technologies such as stereotactic radiotherapy, proton therapy, and brachytherapy offer enhanced precision for reirradiation.

Conclusions:

  • Reirradiation requires careful consideration of patient tolerance, historical data, and the selection of appropriate advanced techniques.
  • Improved ballistic precision with modern technologies is expected to expand the indications for reirradiation in the future.