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Related Concept Videos

One-Compartment Open Model for IV Bolus Administration: General Considerations01:19

One-Compartment Open Model for IV Bolus Administration: General Considerations

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The one-compartment model is a pharmacokinetic tool that models the body as a single, uniform compartment, facilitating the understanding of drug distribution and elimination. This model is particularly beneficial for intravenous (IV) bolus administration, where the drug rapidly circulates throughout the body.
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The two-compartment model for intravenous (IV) bolus administration illustrates drug distribution in the body, subdividing it into central and peripheral compartments. This model operates on the concept of two-compartment kinetics. The drug's plasma concentration shows a bi-exponential decline following IV bolus administration, signaling the presence of two disposition processes: distribution and elimination.
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Clearance is a key pharmacokinetic parameter that quantifies the volume of body fluid from which a drug is entirely removed within a specific time frame. It is crucial in assessing how a drug is eliminated from the body and has critical clinical applications.
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A Practical Distributed Virtual Bolus Strategy for Motion-Robust Superficial Dose Delivery in Breast Volumetric

Qianqian Meng1, Birong Hu2, Hang Yu1

  • 1Radiotherapy Physics and Technology Center, Cancer Center, West China Hospital, Sichuan University, Chengdu, People's Republic of China.

Practical Radiation Oncology
|April 5, 2026
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Summary

A new distributed virtual bolus strategy improves breast radiation therapy robustness against patient motion. This method enhances superficial dose coverage without increasing radiation dose, offering a practical solution for VMAT.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Planning

Background:

  • Superficial dose coverage in breast VMAT is challenged by interfractional motion and anatomical variations.
  • Conventional skin flash strategies lack robustness against these changes.
  • Improving motion robustness without dose escalation is critical for effective breast radiotherapy.

Purpose of the Study:

  • To evaluate limitations of current skin flash strategies in breast VMAT.
  • To propose and assess a practical distributed virtual bolus strategy for enhanced motion robustness.
  • To improve superficial dose coverage and target robustness without dose escalation.

Main Methods:

  • Six flash strategies were evaluated in twelve left-sided breast VMAT plans.
  • A triple virtual planning bolus (tBar) strategy distributed discrete bolus segments along the breast contour.
  • Robustness was assessed using deformation-based motion simulations (up to 15 mm) and evaluated using skin shells and dose-volume metrics.

Main Results:

  • The tBar strategy maintained stable superficial coverage across all simulated motion scenarios.
  • PCTV2 V95% was preserved above 97% for displacements up to 15 mm with the tBar strategy.
  • The tBar strategy reduced high-dose penalty by up to 56.59% compared to virtual target expansion.

Conclusions:

  • A distributed virtual bolus strategy provides motion-robust superficial dose delivery in breast VMAT.
  • This approach effectively limits high-dose escalation.
  • The tBar strategy offers a practical, physics-informed solution for improving motion tolerance in arc-based breast radiotherapy.