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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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Calculating drug dosage and accumulation in multiple-dose regimens is crucial for achieving therapeutic efficacy while avoiding toxicity. This involves determining the plasma drug concentrations over time to optimize dosing schedules. The principle of superposition is fundamental in this process, allowing for the prediction of drug concentration in plasma following multiple doses based on single-dose data.The principle of superposition asserts that the plasma concentration-time curves from...
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A medication’s effectiveness largely depends on its appropriate dosage and the route of administration. Dosage ensures that a sufficient drug concentration is maintained in the bloodstream to elicit the desired therapeutic effect without causing toxicity. The route of administration affects the drug's bioavailability, rate of absorption, and onset of action, which are crucial for achieving optimal therapeutic outcomes. Drug dosage calculations are critical to tailoring therapy to...
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Updated: Dec 12, 2025

Use of Rabbit Eyes in Pharmacokinetic Studies of Intraocular Drugs
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Correlation between eye lens doses and over apron doses in interventional procedures.

M Gracia-Ochoa1, C Candela-Juan1, J Vilar-Palop1

  • 1Centro Nacional de Dosimetría (CND), Avda de Campanar, 21, 46009 Valencia Spain.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|August 9, 2020
PubMed
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Over apron dosimeters can estimate eye lens dose in medical specialties like Interventional Radiology. Geometric correction factors improve accuracy, offering a more comfortable alternative to eye lens dosimeters.

Keywords:
Eye lens dosimetryInterventional proceduresOver apron dosimetry

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Area of Science:

  • Medical Physics
  • Radiological Protection

Background:

  • Eye lens dose monitoring is crucial for radiation workers.
  • Over apron dosimeters are a comfortable alternative to eye lens dosimeters.
  • Geometric correction factors for over apron dosimetry require further investigation in diverse clinical settings.

Purpose of the Study:

  • To investigate the correlation between eye lens dose and over apron dosimetry across various medical specialties.
  • To determine the efficacy of geometric correction factors for over apron dosimeters in different medical contexts.

Main Methods:

  • A standardized protocol was employed across eleven hospitals.
  • Two independent over apron dosimeters were used (chest and neck levels).
  • A dedicated calibration procedure was implemented to assess dose measurements.

Main Results:

  • Good correlation was observed between eye lens dose and over apron dosimetry in specific specialties: Interventional Radiology, Vascular Surgery, Vascular Radiology, Hemodynamics, and Neuroradiology.
  • The study identified specific geometric correction factors for these specialties.
  • Over apron dosimeters were reported as more comfortable than eye lens dosimeters by subjects.

Conclusions:

  • The derived geometric correction factors can be utilized to estimate eye lens dose using over apron dosimeters.
  • Over apron dosimetry offers a more comfortable monitoring solution, provided the increased uncertainty is acceptable compared to dedicated eye lens dosimetry.