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Physiological and compartmental models are valuable tools used in studying biological systems. These models rely on differential equations to maintain mass balance within the system, ensuring an accurate representation of the dynamic processes at play.
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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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Simultaneous dose and dose rate optimization via dose modifying factor modeling for FLASH effective dose.

Jiangjun Ma1, Yuting Lin2, Min Tang1

  • 1Institute of Natural Sciences and School of Mathematics, Shanghai Jiao Tong University, Shanghai, China.

Medical Physics
|June 14, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new proton FLASH radiotherapy planning method, SDDRO-DMF, which optimizes the FLASH effective dose (FED) to improve organ-at-risk sparing. The method successfully reduced high-dose volumes for organs, demonstrating its efficacy in advanced cancer treatment.

Keywords:
FLASHSDDROdose rate optimizationinverse optimizationproton therapytreatment planning

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Optimization

Background:

  • FLASH radiotherapy (FLASH) offers improved organ-at-risk (OAR) sparing via the FLASH effect.
  • A tradeoff exists between physical dose coverage and biological FLASH coverage, necessitating the FLASH effective dose (FED) concept.
  • FED quantifies the net improvement of FLASH compared to conventional radiotherapy (CONV).

Purpose of the Study:

  • Develop a novel treatment planning method, simultaneous dose and dose rate optimization via dose modifying factor modeling (SDDRO-DMF), for proton FLASH.
  • Directly optimize FED using SDDRO-DMF for proton FLASH treatments.

Main Methods:

  • SDDRO-DMF models and optimizes FED using FLASH dose modifying factor (DMF) models, including phenomenological (FEM) and mechanistic (ROD) approaches.
  • The framework demonstrates general applicability for proton FLASH using transmission beams or Bragg peaks, with single or multi-field irradiation.
  • An iterative convex relaxation method solves the inverse optimization problem.

Main Results:

  • SDDRO-DMF was validated against intensity-modulated proton therapy (IMPT) and a state-of-the-art method (SDDRO).
  • The method showed efficacy in reducing high dose and high-dose volumes for OAR in terms of FED.
  • In a lung SBRT case, SDDRO-DMF met a strict brachial plexus dose constraint and eliminated high-dose volume for CTV10mm.

Conclusions:

  • A new proton FLASH optimization method, SDDRO-DMF, was proposed, directly optimizing FED using DMF models.
  • SDDRO-DMF demonstrated efficacy in reducing high-dose OAR volume and/or value compared to IMPT and SDDRO.
  • This method offers a significant advancement in optimizing FLASH radiotherapy plans.