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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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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Mixed integer programming with dose-volume constraints in intensity-modulated proton therapy.

Pengfei Zhang1, Neng Fan2, Jie Shan3

  • 1Department of Radiation Oncology, Mayo Clinic, Scottsdale, AZ, USA.

Journal of Applied Clinical Medical Physics
|July 7, 2017
PubMed
Summary

A new mixed-integer programming (MIP) model effectively generates intensity-modulated proton therapy (IMPT) plans, meeting dose constraints for targets and organs at risk without trial-and-error. This approach ensures consistent plan quality and better normal tissue protection.

Keywords:
dose-volume constraintsintensity-modulated proton therapymixed-integer programming

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Computational Biology

Background:

  • Intensity-modulated proton therapy (IMPT) aims to optimize dose delivery to tumors while sparing healthy tissues.
  • Mixed-integer programming (MIP) is utilized in radiation therapy planning but has limitations with dose-volume constraints in IMPT.
  • This study addresses the need for improved IMPT treatment planning incorporating dose-volume constraints.

Purpose of the Study:

  • To develop and evaluate a novel MIP model for IMPT treatment planning that integrates dose-volume constraints.
  • To compare the efficacy of the new MIP model against conventional methods for IMPT plan generation.
  • To establish a method for balancing tumor coverage and normal tissue protection in IMPT.

Main Methods:

  • A new MIP model was formulated to incorporate dose-volume constraints for IMPT.
  • Two sets of IMPT treatment plans were generated for three patients: one using the Limited-memory Broyden-Fletcher-Goldfarb-Shanno (L-BFGS) method and another using the developed MIP model.
  • Plans were compared using dose-volume histogram (DVH) indices to assess performance.

Main Results:

  • The MIP model with dose-volume constraints produced IMPT plans with comparable target dose coverage and homogeneity to conventional methods.
  • Maximum doses to organs at risk (OARs) were similar, but mean doses to OARs showed notable reductions.
  • The MIP model achieved these results without requiring a tedious trial-and-error process.

Conclusions:

  • The developed MIP model successfully generates IMPT plans that meet all specified dose-volume constraints for targets and OARs.
  • This approach offers automated plan generation with consistent quality across planners and institutions.
  • The model effectively enhances the protection of critical normal tissues, particularly parallel OARs.