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Related Experiment Video

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Quantitative assessment of atrial regional function using motion estimation computed tomography.

Hiroshi Ashikaga1, Jochen Cammin, Qiulin Tang

  • 1From the *Division of Cardiology, †Department of Biomedical Engineering, ‡The Russell H. Morgan Department of Radiology and Radiological Science, and §Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD.

Journal of Computer Assisted Tomography
|July 2, 2014
PubMed
Summary
This summary is machine-generated.

A new image-based motion estimation computed tomographic (CT) technique accurately quantifies regional atrial function in swine. This method reveals subtle dysfunctions missed by global measures.

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Area of Science:

  • Cardiovascular imaging
  • Medical physics
  • Biomedical engineering

Background:

  • Assessing regional atrial function is crucial for understanding cardiac mechanics.
  • Existing methods may not capture subtle, localized changes in atrial activity.

Purpose of the Study:

  • To validate a novel image-based motion estimation computed tomographic (CT) technique (iME) for quantifying swine atrial regional function in vivo.
  • To assess the accuracy and sensitivity of iME in detecting regional variations in atrial contraction.

Main Methods:

  • Domestic swine (n=8) underwent CT scans with contrast.
  • Glass beads were sutured to atria to calculate motion estimation error.
  • Four-dimensional motion vector fields were estimated using iME to calculate the area change ratio (%AC).

Main Results:

  • The iME technique demonstrated high accuracy with an error of 0.76 ± 0.43 mm.
  • %AC revealed significant regional heterogeneity in atrial deformation.
  • Significant differences in %AC time courses were observed between the right and left atria and within the right atrium.

Conclusions:

  • The image-based motion estimation computed tomographic (CT) technique (iME) provides accurate quantitative assessment of atrial regional function.
  • iME can detect subtle regional atrial dysfunction not apparent in global functional indices like ejection fraction.