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Related Concept Videos

Dose Size and Dosing Frequency: Determination Methods01:21

Dose Size and Dosing Frequency: Determination Methods

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

Determination of Multiple Dosing Parameters: Loading and Maintenance Doses

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...
Dosage Regimens: Partial Pharmacokinetic Parameters01:01

Dosage Regimens: Partial Pharmacokinetic Parameters

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

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

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...
Dosage Regimens: Designs and Approaches01:28

Dosage Regimens: Designs and Approaches

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...
Measurement of Bioavailability: Pharmacodynamic Methods01:20

Measurement of Bioavailability: Pharmacodynamic Methods

Pharmacodynamic methods provide insights into a drug's effects on physiological processes over time and play a crucial role in understanding bioavailability and therapeutic efficacy. These methods can be broadly classified into acute pharmacological and therapeutic response approaches, each with distinct mechanisms and applications.The acute pharmacological response method directly correlates a drug's physiological effects, such as ECG or pupil diameter changes, to its time course in the body.

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Related Experiment Video

Updated: Jun 17, 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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The accuracy of dose-rate-regulated tracking: a parametric study.

S Han-Oh1, B Yi, B L Berman

  • 1Department of Physics, The George Washington University, Washington, DC 20052, USA.

Physics in Medicine and Biology
|January 15, 2010
PubMed
Summary

Dose-rate-regulated tracking (DRRT) system limitations and patient breathing irregularities significantly impact tumor tracking accuracy. Time delay and breathing variations are key factors influencing tracking errors in DRRT.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Image-Guided Therapy

Background:

  • Dose-rate-regulated tracking (DRRT) is an advanced tumor-tracking method using multileaf-collimator (MLC) sequences and dose-rate modulation.
  • Understanding DRRT performance under realistic clinical conditions, including system limitations and patient breathing variations, is crucial for effective implementation.

Purpose of the Study:

  • To investigate the impact of DRRT system limitations and breathing irregularities on tracking error and duty cycle.
  • To identify the primary factors contributing to tracking inaccuracies and operational efficiency in DRRT.

Main Methods:

  • Simulated DRRT treatments using 2126 breathing cycles from 24 lung cancer patients.
  • Analyzed the effects of time delay and dose-rate increment (continuous, discrete, beam switching) as system limitations.
  • Quantified breathing irregularities by period variation, peak-to-peak amplitude variation, and baseline drift.

Main Results:

  • Tracking error and duty cycle showed minor differences across the three dose-rate increment methods.
  • Time delay, breathing peak-to-peak amplitude variation, and baseline drift were identified as major contributors to tracking error.
  • The allowed dose-rate increment, peak-to-peak amplitude variation, and baseline drift most significantly affected the DRRT duty cycle.

Conclusions:

  • DRRT system parameters and patient-specific breathing patterns critically influence treatment accuracy and efficiency.
  • Time delay and breathing motion variability are key challenges to address for optimizing DRRT performance in lung cancer radiotherapy.