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Related Concept Videos

Dose Size and Dosing Frequency: Determination Methods01:21

Dose Size and Dosing Frequency: Determination Methods

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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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Determination of Multiple Dosing Parameters: Loading and Maintenance Doses01:25

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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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Dosage Regimen: Individualization01:24

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Individualization in dosing regimens is the customization of medication doses for individual patients. Its necessity arises from the goal of maximizing therapeutic benefits while minimizing risks. This approach is pivotal because human responses to drugs can vary widely; what is effective for one person may be inadequate or excessive for another. Interpatient (intersubject) variability refers to differences in drug responses between individuals, while intrapatient (intrasubject) variability...
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Dosage Regimens: Designs and Approaches01:28

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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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Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations01:15

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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...
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It is not uncommon for complete drug pharmacokinetic profiles to remain elusive in pharmacokinetics. This necessitates certain educated assumptions by pharmacokineticists to determine appropriate dosage regimens without comprehensive pharmacokinetic data from animal or human studies. One prevalent assumption is setting the bioavailability factor, denoted as F, to 1 or 100%. This assumption caters to the scenario where a drug doesn't achieve full systemic absorption, resulting in the patient...
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Dose calibration optimization and error propagation in polymer gel dosimetry.

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  • 1Department of Physics and Astronomy, University of Victoria, Victoria BC V8W 3P6, Canada.

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A new full-image calibration technique for NIPAM-based x-ray CT polymer gel dosimetry was evaluated. Key parameters like gradient thresholding and dose bin size significantly impact image errors, while spatial remeshing has minimal effect.

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Area of Science:

  • Medical Physics
  • Radiological Imaging
  • Radiation Dosimetry

Background:

  • X-ray CT polymer gel dosimetry is crucial for accurate radiation dose measurement.
  • Existing calibration techniques can introduce significant errors.
  • A need exists for robust and precise calibration methods in gel dosimetry.

Purpose of the Study:

  • To evaluate a new full-image calibration technique for NIPAM-based x-ray CT polymer gel dosimetry.
  • To assess the impact of various calibration parameters on dose accuracy.
  • To provide a comprehensive error propagation analysis for CT gel dosimetry.

Main Methods:

  • Implementation and testing of a novel full-image calibration technique.
  • Analysis of calibration parameters including gradient thresholding, dose bin size, fit function, and spatial remeshing.
  • Full error propagation analysis across the entire CT gel image pre-processing and calibration workflow.

Main Results:

  • Gradient thresholding, dose bin size, and fit function were identified as primary factors influencing errors in calibrated gel images.
  • Spatial remeshing demonstrated minimal impact on error reduction or increase.
  • The study provides a realistic assessment of errors in calibrated CT polymer gel dosimetry.

Conclusions:

  • The developed full-image calibration technique offers improved precision and error understanding in CT polymer gel dosimetry.
  • The methodology is broadly applicable to other CT dosimetry protocols, including MRI and optical CT.
  • This work enhances the reliability and generalizability of polymer gel dosimetry calibration.