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Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm
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Evaluating reconstruction algorithms for respiratory motion guided acquisition.

Owen Dillon1,2, Paul J Keall1, Chun-Chien Shieh1,3

  • 1ACRF Image X Institute, Faculty of Medicine and Health, University of Sydney, Sydney, NSW 2006, Australia.

Physics in Medicine and Biology
|June 3, 2020
PubMed
Summary
This summary is machine-generated.

Respiratory-Motion-Guided (RMG) acquisition significantly reduces 4D Cone-Beam CT scan time and radiation dose by 70% and 80% respectively. Motion-compensated reconstruction algorithms maintain image quality, enabling faster and safer thoracic imaging.

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Area of Science:

  • Medical Imaging
  • Radiotherapy Physics
  • Computational Imaging

Background:

  • Conventional 4D Cone-Beam CT (4DCBCT) requires extensive projections (1320) over 4 minutes, leading to high radiation dose and prolonged scan times.
  • Optimizing 4DCBCT acquisition and reconstruction is crucial for improving patient safety and treatment efficiency in radiotherapy.

Purpose of the Study:

  • To evaluate the effectiveness of Respiratory-Motion-Guided (RMG) acquisition with reduced projections (200) for thoracic 4DCBCT.
  • To compare the performance of various reconstruction algorithms, including novel motion-compensated methods, under RMG acquisition protocols.
  • To assess the impact of RMG acquisition on scan time, radiation dose, and image quality metrics.

Main Methods:

  • Simulated 200-projection RMG 4DCBCT data and conventional 1320-projection data from 14 patients' 4DCT volumes.
  • Reconstruction using Feldkamp-David-Kress (FDK), McKinnon-Bates (MKB), ROOSTER, and motion-compensated algorithms (MCFDK, novel MCMKB).
  • Image quality assessed via Root-Mean-Square Error (RMSE), Structural SIMilarity index (SSIM), Tissue Interface Sharpness (TIS), and geometric accuracy.

Main Results:

  • RMG acquisition reduced scan time by an average of 70% and dose by 80% compared to conventional methods.
  • Motion Compensated FDK (MCFDK) reconstruction with RMG acquisition showed comparable image quality to conventional 4DFDK, with mean RMSE, SSIM, TIS, and geometric error of 113, 0.9986, 1.76, and 1.77 mm, respectively.
  • Novel motion-compensated algorithms demonstrated potential for further optimization with minimal computational overhead.

Conclusions:

  • Respiratory-Motion-Guided (RMG) acquisition combined with motion-compensated reconstruction significantly reduces 4DCBCT scan time and dose.
  • This approach maintains diagnostic image quality, offering a safer and more efficient imaging solution for thoracic radiotherapy.
  • The findings support the clinical implementation of RMG acquisition for improved patient care.