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Related Concept Videos

Beams01:30

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Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
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Location and Orientation of the Heart01:13

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The human heart, despite its modest size and weight, is an organ of remarkable strength and endurance. Roughly the size of a fist, the heart weighs between 250 and 350 grams and is nestled within the mediastinum, the medial cavity of the thorax. It extends obliquely for about 12 to 14 cm, resting on the superior surface of the diaphragm. The heart is positioned anterior to the vertebral column and posterior to the sternum, with two-thirds of its mass lying to the left of the midsternal line.
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Sound Intensity00:58

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The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the...
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Deflection of a Beam01:19

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Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
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Sound Intensity Level00:53

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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
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Proton (¹H) NMR: Chemical Shift01:07

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Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

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Robust beam orientation optimization for intensity-modulated proton therapy.

Wenbo Gu1, Ryan Neph1, Dan Ruan1

  • 1Department of Radiation Oncology, University of California-Los Angeles, Los Angeles, CA, 90095, USA.

Medical Physics
|June 7, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel Intensity Modulated Proton Therapy (IMPT) framework that unifies robust beam orientation optimization (BOO) and fluence map optimization (FMO). The new method improves treatment plan robustness and organ-at-risk sparing for cancer patients.

Keywords:
beam orientation optimizationintegratedintensity modulationprotonrobustness

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Computational Imaging

Background:

  • Intensity Modulated Proton Therapy (IMPT) requires both dose conformity and robustness for effective cancer treatment.
  • Optimizing beam orientation (BOO) and fluence maps (FMO) for robustness in IMPT is computationally challenging and lacks automated solutions.
  • Existing methods often struggle to balance dosimetry and robustness against uncertainties like range and setup variations.

Purpose of the Study:

  • To develop a novel, unified IMPT framework integrating robust beam orientation optimization (BOO) and robust fluence map optimization (FMO).
  • To enhance treatment plan robustness against both range and setup uncertainties in proton therapy.
  • To improve computational efficiency and automation in IMPT planning.

Main Methods:

  • A unified framework formulated with dose fidelity, heterogeneity-weighted group sparsity, and sensitivity regularization terms.
  • Utilized L2, 1/2-norm group sparsity to reduce candidate beams from 1162 to 2-4, prioritizing beams resilient to uncertainties.
  • Tested the Sensitivity regularization and Heterogeneity weighting based BOO and FMO (SHBOO-FMO) framework on skull-base and head-and-neck cancer patients, comparing against conventional and worst-case scenario plans.

Main Results:

  • The SHBOO-FMO method selected beams with superior range robustness, maintaining or improving setup robustness compared to manual plans.
  • Significant improvements in CTV coverage (e.g., D95% increased from 93.85% to 98.62% with range uncertainties) were observed.
  • SHBOO-FMO plans demonstrated comparable robustness to worst-case scenario plans but achieved better organ-at-risk sparing.

Conclusions:

  • A novel, unified method for integrated robust BOO and FMO in IMPT was successfully developed.
  • The proposed framework generates Intensity Modulated Proton Therapy plans with superior dosimetry and enhanced robustness.
  • This approach offers a promising solution for optimizing proton therapy treatments, improving patient outcomes.