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Related Experiment Videos

Motion artifact reduction for IVUS-based thermal strain imaging.

Yan Shi1, F Javier de Ana, Stanley J Chetcuti

  • 1University of Michigan, Biomedical Engineering Department, Ann Arbor, MI 48109, USA. yans@umich.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|October 26, 2005
PubMed
Summary

Thermal strain imaging (TSI) with intravascular ultrasound (IVUS) can detect vulnerable plaques. Cardiac motion is a challenge, but spatial interpolation and a novel imaging scheme effectively compensate for it, enabling in vivo lipid detection.

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Imaging
  • Medical Diagnostics

Background:

  • Intravascular ultrasound (IVUS) is used for diagnosing acute coronary syndromes.
  • Identifying lipid pools in rupture-prone arterial plaques is crucial for risk stratification.
  • Current IVUS systems lack the ability to directly assess plaque vulnerability based on composition.

Purpose of the Study:

  • To evaluate the feasibility of thermal strain imaging (TSI) using IVUS for detecting lipid pools in atherosclerotic plaques.
  • To address the challenge of cardiac motion artifacts in in vivo TSI applications.
  • To propose and validate a practical imaging scheme for accurate TSI in the presence of cardiac motion.

Main Methods:

  • Simulations were performed using an artery model with a lipid-filled plaque.

Related Experiment Videos

  • Bulk motion compensation was achieved using spatial interpolation techniques.
  • A linear least squares fitting strategy was employed to minimize mechanical strains from tissue deformation.
  • The proposed imaging scheme was tested on clinical data with artificially superimposed thermal displacements.

    • Main Results:

    • Effective bulk motion compensation was demonstrated within a specific motion range.
    • The proposed imaging scheme successfully minimized mechanical strains caused by tissue deformation.
    • A temperature rise of 1-2 degrees C was found to be sufficient for in vivo lipid detection in atherosclerotic plaques.

    Conclusions:

    • Thermal strain imaging (TSI) holds significant potential as a supplement to current IVUS systems for diagnosing acute coronary syndromes.
    • The developed methods effectively address the challenges posed by cardiac motion for in vivo TSI.
    • TSI, with a 1-2 degrees C temperature rise, can reliably detect lipids in atherosclerotic plaques, improving plaque vulnerability assessment.