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Second-order motion compensation improves cardiac diffusion tensor imaging by reducing sensitivity to heart motion. This allows for better visualization of myocardial microstructure throughout the cardiac cycle.

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Area of Science:

  • Cardiovascular Imaging
  • Biomedical Engineering
  • Diffusion Tensor Imaging

Background:

  • Probing myocardial microstructure in vivo is challenging.
  • Spin echo diffusion-weighted imaging is sensitive to cardiac motion.

Purpose of the Study:

  • Compare second-order motion-compensated diffusion encoding with first-order methods.
  • Assess the impact of cardiac motion during systole on diffusion imaging.

Main Methods:

  • Implemented first- and second-order motion-compensated diffusion encoding in a triggered single-shot spin echo sequence.
  • Investigated the effect of contractile motion on apparent diffusion coefficients and tensor orientations in vivo.

Main Results:

  • Second-order motion compensation significantly expanded the range of systolic trigger delays.
  • Diffusion tensor analysis with second-order compensation provided more physiological transmural distributions.

Conclusions:

  • Higher-order motion compensation reduces cardiac motion sensitivity in diffusion tensor imaging (DTI).
  • Enables cardiac DTI acquisition over a broader range of systolic time points.