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Related Concept Videos

Dose Size and Dosing Frequency: Determination Methods01:21

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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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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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MO-F-213AB-01: Improving Dose Uniformity in Patch-Field Proton Therapy Using Beam Current Modulation.

P Hill1, E Klein1, C Bloch1

  • 1Washington University School of Medicine, Department of Radiation Oncology, Saint Louis, MO.

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

Beam current modulation improves dose homogeneity in patch-field proton therapy. Optimizing beam current reduces dose non-uniformity (DNU) in patched dose distributions, mitigating hot and cold spots for better treatment.

Keywords:
Monte Carlo methodsProton therapy

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Particle Therapy

Background:

  • Patch-field proton therapy aims for precise dose delivery.
  • Dose non-uniformity (DNU) is a challenge in combining dose distributions.
  • Beam current modulation offers a potential solution for improving homogeneity.

Purpose of the Study:

  • To enhance dose homogeneity in patch-field proton therapy.
  • To investigate the use of beam current modulation for dose optimization.
  • To reduce dose non-uniformity (DNU) in patched dose distributions.

Main Methods:

  • MCNPX simulations of the Mevion S250 beamline.
  • Calculation of spread-out Bragg peak (SOBP) dose distributions.
  • Optimization of distal dose profiles using beam current modulation.

Main Results:

  • Standard delivery showed DNU <= 10% for depths 12.5-17.5 cm, but >35% outside this range.
  • Optimized distal profiles reduced DNU to <= 10% for depths >12.5 cm.
  • Shallower depths (<12.5 cm) showed no improvement due to limitations in matching lateral profiles.

Conclusions:

  • Optimized beam current modulation creates gradual distal dose falloff, improving homogeneity.
  • This technique mitigates hot/cold spots in patched proton therapy dose distributions.
  • The method is applicable to feathering and scanned beam deliveries for enhanced dose uniformity.