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Quantitative sparse array vascular elastography: the impact of tissue attenuation and modulus contrast on

Steven Huntzicker1, Rohit Nayak1, Marvin M Doyley2

  • 1University of Rochester , Hajim School of Engineering and Applied Sciences, Department of Electrical and Computer Engineering, Rochester, New York 14627.

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Summary

Sparse array (SA) imaging shows promise for vascular elastography, offering reduced artifacts and comparable results to plane-wave (PW) imaging for visualizing vascular tissue shear modulus, despite low transmit power.

Keywords:
carotid arteryelastographyshear modulussparse-arraystrokevascular imaging

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Ultrasound Technology

Background:

  • Quantitative sparse array (SA) vascular elastography visualizes shear modulus in vascular tissues, aiding stroke reduction.
  • Low transmit power in SA imaging may limit clinical utility of elastograms.
  • Vascular tissue characterization is crucial for diagnosing and managing conditions like atherosclerosis.

Purpose of the Study:

  • To evaluate the performance of modulus elastograms from SA imaging compared to conventional linear array (CLA) and plane-wave (PW) imaging.
  • To assess the impact of varying attenuation coefficients and modulus contrasts on elastogram quality.
  • To determine the clinical feasibility of SA imaging for superficial vascular applications.

Main Methods:

  • Simulated and physical vessel phantoms with controlled attenuation and modulus contrasts were used.
  • Modulus elastograms were generated using SA, CLA, and PW imaging techniques.
  • Image quality metrics including artifact presence and modulus contrast-to-noise ratio were analyzed.

Main Results:

  • Plaques were visible in all elastograms; SA and PW images had fewer artifacts than CLA.
  • Modulus contrast-to-noise ratio decreased with increasing modulus contrast and attenuation, especially with SA imaging.
  • Error rates were 10.9%–24% (CLA), 1.8%–12% (SA), and [Formula: see text] (PW). SA and PW results were not significantly different.

Conclusions:

  • SA imaging can produce useful modulus elastograms for superficial organs like the carotid artery, despite low transmit power.
  • SA imaging offers a viable alternative to CLA and PW imaging, with comparable performance to PW.
  • Further research can optimize SA techniques for enhanced vascular imaging and clinical applications.