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Three-Dimensional Phase Resolved Functional Lung Magnetic Resonance Imaging
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Availability of a simplified lung ventilation imaging algorithm based on four-dimensional computed tomography.

Yuan Tian1, Junjie Miao1, Zhiqiang Liu1

  • 1Department of Radiation Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing 100021, China.

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)
|August 21, 2019
PubMed
Summary

A new simplified ventilation imaging algorithm (VIAAVG) using average CT (AVG CT) offers high accuracy and efficiency for clinical use. It outperforms other four-dimensional computed tomography (4DCT) ventilation imaging algorithms in accuracy and speed.

Keywords:
4DCTDeformable vector fieldDice similarity coefficientSPECTVentilation image

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Area of Science:

  • Medical Imaging
  • Radiotherapy Physics
  • Computational Anatomy

Background:

  • Accurate ventilation imaging is crucial for radiotherapy planning in lung and esophageal cancer.
  • Current four-dimensional computed tomography (4DCT) ventilation imaging algorithms vary in accuracy and efficiency.
  • A simplified algorithm requiring only average CT (AVG CT) input could improve clinical workflow.

Purpose of the Study:

  • To propose and evaluate a simplified 4DCT-based ventilation imaging algorithm (VIAAVG).
  • To quantitatively compare the accuracy and efficiency of VIAAVG against three other popular algorithms (VIAJAC, VIAHU, VIAPRO).

Main Methods:

  • Fifty patients undergoing radiotherapy for lung or esophageal cancer were included.
  • 4DCT and single photon emission computed tomography (SPECT) ventilation images (VI-SPECT) were acquired.
  • Four 4DCT ventilation imaging algorithms (VIAJAC, VIAHU, VIAPRO, VIAAVG) were applied, and computation times were recorded.
  • Dice Similarity Coefficients (DSCs) were calculated between each CT-derived ventilation image (CTVI) and VI-SPECT to assess accuracy.

Main Results:

  • VIAAVG demonstrated the highest mean DSC (0.5958), comparable to VIAPRO (0.5865).
  • VIAAVG had the shortest average computation time (15.0 s), significantly faster than VIAHU (24.2 s) and VIAPRO (144.8 s).
  • VIAJAC showed the lowest accuracy (0.3255) and moderate speed (18.3 s).

Conclusions:

  • The simplified VIAAVG algorithm provides accurate and efficient ventilation imaging.
  • VIAAVG requires minimal input (AVG CT) and is suitable for clinical application.
  • VIAAVG represents an advancement in 4DCT-based ventilation imaging for radiotherapy.