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Dong-Su Kim1,2, Seungwan Lee3, Tae-Ho Kim1,2

  • 1Department of Biomedical Engineering and Research Institute of Biomedical Engineering, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.

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This study introduces respiratory-guided 4D digital tomosynthesis (DTS) to reduce imaging dose and improve image quality. Visual guidance during DTS significantly reduces motion artifacts and enhances image quality compared to free-breathing methods.

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Area of Science:

  • Medical Imaging
  • Radiological Physics
  • Respiratory Gating

Background:

  • 4D digital tomosynthesis (DTS) is crucial for imaging moving organs.
  • Respiratory motion introduces artifacts in DTS, impacting image quality.
  • Current methods for managing respiratory motion in DTS can be improved.

Purpose of the Study:

  • To introduce and evaluate a novel respiratory-guided slow gantry rotation 4D DTS system.
  • To assess the impact of visual respiratory guidance on image quality and data acquisition.
  • To compare the performance of guided DTS with free-breathing DTS.

Main Methods:

  • Ten volunteers underwent free-breathing and visually guided DTS using a pressure-sensing system.
  • Virtual projections were acquired using Varian on-board imager geometry for mSL and XCAT phantoms.
  • Image reconstruction utilized modified filtered back-projection, with comparisons based on SSIM and NRMSE.

Main Results:

  • Respiratory-guided DTS (SwG) demonstrated reduced motion-related artifacts compared to free-breathing (SuFB).
  • SwG required fewer projections (NPA) while yielding higher SSIM and lower NRMSE values.
  • SwG resulted in a more regular distribution of projections per phase.

Conclusions:

  • The proposed respiratory-guided 4D DTS effectively reduces imaging dose.
  • This technique improves image quality by minimizing motion artifacts.
  • Visual respiratory guidance offers a promising approach for enhanced 4D DTS imaging.