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Related Concept Videos

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
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Rotation effects on the target-volume margin determination.

Qinghui Zhang1, Weijun Xiong2, Maria F Chan2

  • 1Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, NE 68198, USA; Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a new formula to calculate the planning target volume (PTV) margin, accounting for both patient setup and rotational errors in radiation therapy. This ensures more accurate radiation delivery by improving the margin between the clinical target volume (CTV) and PTV.

Keywords:
MarginRadiotherapyRotationSetup errorsTarget volume

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Planning

Background:

  • Setup errors, including rotational components, are often overlooked in clinical radiotherapy.
  • Accurate patient positioning is crucial for effective radiation dose delivery.
  • Existing methods for planning target volume (PTV) margin determination may not fully account for rotational uncertainties.

Purpose of the Study:

  • To develop an analytical formula for calculating the planning target volume (PTV) margin.
  • To incorporate corrections for both translational and rotational setup errors into margin determination.
  • To provide a more comprehensive approach to accounting for setup uncertainties in radiotherapy.

Main Methods:

  • Development of an analytical formula to quantify extra margin.
  • Inclusion of both translational and rotational setup error components.
  • Integration of the derived formula into the planning target volume (PTV) margin calculation process.

Main Results:

  • An analytical formula was successfully developed to determine the extra margin needed for setup errors.
  • The formula explicitly corrects for both translational and rotational patient setup uncertainties.
  • The proposed method offers a systematic way to incorporate these corrections into PTV margin definitions.

Conclusions:

  • The developed analytical formula provides a robust method for determining planning target volume (PTV) margins.
  • Accounting for rotational setup errors is essential for accurate radiotherapy.
  • This approach can enhance the safety and efficacy of radiation treatments by optimizing target margins.