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Related Concept Videos

Radiation: Applications01:17

Radiation: Applications

The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Updated: Jun 23, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Published on: February 6, 2019

Integral dose conservation in radiotherapy.

Adam S Reese1, Shiva K Das, Charles Curie

  • 1Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina 27710, USA. adam.reese@duke.edu

Medical Physics
|April 22, 2009
PubMed
Summary
This summary is machine-generated.

Radiation therapy planning using Intensity-Modulated Radiation Therapy (IMRT) and 3D conformal techniques shows dose redistribution is limited to within normal tissue shells, not between them. This impacts critical structure sparing based on geometry.

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Planning

Background:

  • Treatment planners use Intensity-Modulated Radiation Therapy (IMRT) and modified beam arrangements to optimize target dose coverage and spare normal tissues.
  • Understanding the limitations of dose redistribution in radiation therapy is crucial for improving treatment planning strategies.

Purpose of the Study:

  • To quantitatively assess the extent to which radiation dose can be redistributed within the patient volume.
  • To test the hypotheses that normalized integral dose is constant across concentric normal tissue shells, across different beam configurations, and when sparing critical structures.

Main Methods:

  • Generated competing 3D conformal and IMRT plans for seven cancer patients (brain/prostate) and one idealized scenario.
  • Quantitatively compared normalized integral doses within concentric shells of normal tissue surrounding the target for various beam configurations and critical structure sparing levels.

Main Results:

  • Normalized integral dose to normal tissue shells surrounding the target was relatively constant within each patient.
  • This constancy held true regardless of the number/orientation of beams or the degree of critical structure sparing.
  • Dose redistribution is limited to within a shell, not between shells, implying geometric constraints on critical structure sparing.

Conclusions:

  • 3D and IMRT planning tools redistribute dose within normal tissue shells rather than eliminating it.
  • Limitations exist in sparing critical structures due to their location and geometry relative to the target, as dose cannot be moved between shells.