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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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Dose-Response Relationship: Selectivity and Specificity01:25

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Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and...
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Determination of Multiple Dosing Parameters: Loading and Maintenance Doses01:25

Determination of Multiple Dosing Parameters: Loading and Maintenance Doses

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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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Rational Dosage Regimen: Maintenance Dose and Loading Dose01:24

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A rational dosage regimen considers a drug's pharmacokinetics, including its absorption, distribution, metabolism, and elimination from the body. By understanding these factors, the appropriate dosage can be determined, and the dosing schedule can be designed to achieve and maintain the desired therapeutic effect while minimizing adverse effects.
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Knowledge of the sample size is the first requirement to conduct random sampling or an experiment. The sample size is the total number of units, observations, or groups (in some cases) used to get the data to estimate a population parameter. As the name suggests, the sample size is that of the sample drawn from the population and differs from the population size.
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Agonists can bind with and activate receptors, resulting in the formation of drug-receptor complexes. Once formed, these complexes catalyze many biochemical processes at the cellular level and subsequently induce a pharmacologic response. The degree of response is directly proportional to the fraction of activated receptors, which in turn, depends on the concentration of the drug at the receptor site as well as the sensitivity of the receptor. An increase in the administered dose contributes to...
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Expedited Radiation Biodosimetry by Automated Dicentric Chromosome Identification ADCI and Dose Estimation
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DEVELOPMENT OF RADIATION DOSE CALCULATION SOFTWARE USING THE SIZE-SPECIFIC DOSE ESTIMATE.

Tomokazu Shohji1, Atsushi Tachibana2, Sousuke Higuchi1

  • 1Department of Radiology, The Jikei University Hospital, 3-19-18 Nishi-Shimbashi, Minato-ku, Tokyo, Japan.

Radiation Protection Dosimetry
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This study introduces software for calculating pixel dose, a more accurate measure than size-specific dose estimate (SSDE) in radiation dosimetry. The developed software demonstrates high accuracy, proving useful for precise radiation dose determination.

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Area of Science:

  • Medical Physics
  • Radiological Dosimetry
  • Software Development

Background:

  • Accurate absorbed dose calculation is crucial in diagnostic radiology.
  • Current methods like size-specific dose estimate (SSDE) have limitations in precision.
  • Radiophotoluminescence glass dosimeters (RPLD) offer a reliable method for dose measurement.

Purpose of the Study:

  • To develop and validate software for calculating absorbed dose per pixel (pixel dose).
  • To compare the accuracy of pixel dose calculation with size-specific dose estimate (SSDE).
  • To assess the software's utility for determining radiation dose at arbitrary points.

Main Methods:

  • Pixel dose was calculated using a novel software tool.
  • Calculations were performed at nine points within a radiophotoluminescence glass dosemeter (RPLD).
  • Calculated pixel doses were compared against measured doses obtained from RPLD.

Main Results:

  • The developed software achieved high accuracy in pixel dose calculation.
  • Relative errors for pixel dose were minimal (-0.1% for adults, <4% for children).
  • Size-specific dose estimate (SSDE) showed significantly higher relative errors (17-20%).

Conclusions:

  • The developed software provides a highly accurate method for pixel dose calculation.
  • Pixel dose calculation is superior to SSDE for precise radiation dosimetry.
  • The software is a valuable tool for determining radiation dose at specific points.