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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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Nomograms and tabulations are vital tools used by clinicians to design accurate and individualized dosage regimens. These instruments provide a straightforward method for adjusting dosages based on individual patient characteristics, including age, weight, and physiological condition. The foundation of a drug's nomogram is population pharmacokinetic data collected and analyzed using specific models. This data simplifies complex equations, presenting them diagrammatically or tabularly for easy...
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Designing a dosage regimen, which refers to the manner of drug administration, is a complex process involving the selection of drug dose, route, and frequency. This process is underpinned by pharmacokinetic parameters derived from tests and population averages. These parameters are then tailored to patient-specific variables such as diagnosis, demographics, and allergy status. Once therapy commences, therapeutic response monitoring is critical and achieved through clinical and physical...
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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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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...
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Pharmacokinetic models are mathematical constructs that represent and predict the time course of drug concentrations in the body, providing meaningful pharmacokinetic parameters. These models are categorized into compartment, physiological, and distributed parameter models.
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Model-Based Dose Calculation Algorithms for Brachytherapy Dosimetry.

Shirin A Enger1, Javier Vijande2, Mark J Rivard3

  • 1Department of Oncology, McGill University, Montreal, Quebec, Canada; Medical Physics Unit, McGill University, Montreal, Quebec, Canada; Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada.

Seminars in Radiation Oncology
|November 16, 2019
PubMed
Summary
This summary is machine-generated.

This study reviews limitations in current brachytherapy dose calculation methods, recommending a shift to advanced model-based algorithms for improved accuracy in various cancer treatments.

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • The American Association of Physicists in Medicine (AAPM) Task Group No. 43 (TG-43) report provides a formalism for brachytherapy dose calculations.
  • Limitations in TG-43 exist, particularly concerning tissue and applicator heterogeneities.
  • Transitioning to advanced algorithms is necessary for more accurate dose distributions.

Purpose of the Study:

  • To review the limitations of the AAPM TG-43 dose calculation formalism for photon-emitting brachytherapy sources.
  • To provide recommendations for transitioning to model-based dose calculation algorithms.
  • To present an overview of model-based algorithms and their approaches.

Main Methods:

  • Comparative analysis of dose calculations using TG-43 formalism versus model-based algorithms.
  • Investigation of the influence of tissue and seed/applicator heterogeneities.
  • Evaluation across diverse brachytherapy applications: breast, gynecologic, head and neck, rectum, prostate cancers, eye plaques, and electronic brachytherapy.

Main Results:

  • TG-43 formalism exhibits limitations in accurately calculating dose distributions, especially in heterogeneous environments.
  • Model-based dose calculation algorithms demonstrate improved accuracy in complex scenarios.
  • Significant differences in dose distributions were observed between TG-43 and model-based calculations for various cancer sites.

Conclusions:

  • A transition from TG-43 to model-based dose calculation algorithms is recommended for photon-emitting brachytherapy.
  • Model-based algorithms offer superior accuracy for brachytherapy dose calculations, accounting for heterogeneities.
  • Adoption of model-based approaches will enhance treatment planning and delivery for brachytherapy patients.