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Phase-Resolved Functional Lung MRI for Pulmonary Ventilation and Perfusion (V/Q) Assessment
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A comparison between amplitude sorting and phase-angle sorting using external respiratory measurement for 4D CT.

Wei Lu1, Parag J Parikh, James P Hubenschmidt

  • 1Department of Radiation Oncology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

Medical Physics
|September 13, 2006
PubMed
Summary

Amplitude sorting for four-dimensional computed tomography (4D CT) reduces radiation therapy errors by improving tumor motion modeling. This method offers superior image quality and motion correlation compared to phase angle sorting for thoracic treatments.

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Image Reconstruction

Background:

  • Respiratory motion introduces significant dose delivery errors in conformal radiation therapy for thoracic and upper abdominal tumors.
  • Four-dimensional computed tomography (4D CT) is crucial for modeling tumor motion and mitigating these errors.
  • Accurate reconstruction of respiratory motion is vital for effective treatment planning.

Purpose of the Study:

  • To compare the efficacy of amplitude sorting versus phase angle sorting for 4D CT reconstruction.
  • To evaluate which sorting method better models internal lung motion and reduces image artifacts.
  • To determine the optimal method for improving dose delivery accuracy in radiation therapy.

Main Methods:

  • Acquired 4D CT data using a 16-slice scanner in ciné mode with synchronized respiratory measurements.
  • Sorted CT scans into 12 phases using either amplitude (based on respiratory signal amplitude) or phase angle (0-360 degrees).
  • Correlated air content (surrogate for internal motion) with respiratory amplitude and phase angle.

Main Results:

  • Amplitude sorting resulted in fewer reconstruction artifacts and smaller variations in respiratory amplitude (P < 0.001) compared to phase angle sorting.
  • Finer phase subdivisions improved amplitude sorting consistency but not phase angle sorting.
  • Air content showed a significantly stronger correlation with respiratory amplitude than phase angle (P < 0.001) for most patients.

Conclusions:

  • Amplitude sorting is a superior method for 4D CT reconstruction in radiation therapy, outperforming phase angle sorting for most patients.
  • This improved motion modeling can lead to more accurate dose delivery and reduced treatment errors.
  • Amplitude sorting provides a more reliable representation of internal motion for treatment planning.