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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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The correlation between a drug's dosage and its impact on a biological system is a cornerstone of pharmacology and toxicology. Conventional dose–response curves, which include graded and quantal relationships, are key to this understanding. Graded dose–response curves depict the spectrum of a biological reaction to different doses within an individual, indicating that as the drug dosage increases, so does the intensity of the response. On the other hand, quantal dose–response...
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Related Experiment Video

Updated: Mar 2, 2026

Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform
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SU-E-T-632: Metrics for Comparing Dose Volume Histograms.

O Nohadani1,2,3, C Medawar1,2,3, A Roy1,2,3

  • 1Purdue University, Lafayette, In.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

Treatment planning quality varies significantly between individuals. New metrics enable unbiased comparison of dose-volume histograms (DVHs), revealing planner-dependent outcomes and the need for objective planning tools.

Keywords:
CancerIntensity modulated radiation therapyMedical treatment planningOptical inspection

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Image Guided Therapy

Background:

  • Intensity-Modulated Radiation Therapy (IMRT) planning is a complex inverse planning process with competing objectives for tumors and organs at risk (OARs).
  • The final treatment plan quality is often an unpredictable result of iterative trial-and-error adjustments.
  • Dose-Volume Histograms (DVHs) are crucial for assessing plan quality but require objective comparison metrics.

Purpose of the Study:

  • To develop and evaluate a set of metrics for unbiased comparison of DVHs generated during IMRT planning.
  • To quantify the impact of individual planner variability on treatment plan quality.
  • To assess the effectiveness of different weighting functions in evaluating DVH deviations.

Main Methods:

  • Seven radiation oncologists planned a single prostate cancer case with identical clinical objectives for the planning target volume (PTV) and OARs.
  • A deviation function (L) was defined to measure the area between the ideal and achieved DVH.
  • Various dose-dependent weight functions (W) were employed, including constant, linear, quadratic, normal, and beta-distributional forms.

Main Results:

  • Significant and consistent differences in plan quality (deviation) were observed among the seven planners across all weighting functions.
  • One planner consistently achieved the lowest deviation, while another showed variable performance depending on the weighting function used.
  • Normal and beta-density weighting functions primarily penalized deviations within the 95%-105% dose range, showing sensitivity to specific error types.

Conclusions:

  • Treatment planning outcomes are strongly influenced by individual planner characteristics.
  • The proposed DVH metrics provide an objective method for plan comparison, surpassing subjective visual inspection.
  • These findings highlight the need for planning techniques that minimize planner dependency and suggest potential for a practical, optimized metric tool.