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Related Experiment Video

Updated: Jul 4, 2026

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
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Improved slice selection for R2* mapping during cryoablation with eddy current compensation.

Aiming Lu1, Bruce L Daniel, John M Pauly

  • 1Department of Radiology, Stanford University, Stanford, CA, USA. aiminglu@uic.edu

Journal of Magnetic Resonance Imaging : JMRI
|June 27, 2008
PubMed
Summary
This summary is machine-generated.

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This study introduces a new method to reduce image artifacts from eddy currents during cryoablation imaging. This improves the quality of R2* maps, essential for monitoring the freezing process in tissues.

Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging
  • Cryoablation

Background:

  • Eddy currents degrade image quality in ultrashort echo time (UTE) imaging.
  • Cryoablation monitoring requires high-quality R2* mapping.

Purpose of the Study:

  • To enhance R2* mapping in cryoablation iceballs using UTE imaging.
  • To compensate for eddy currents induced by radiofrequency (RF) pulses and gradients.

Main Methods:

  • Simultaneous measurement of B0 and linear eddy currents using phantom calibration.
  • Redesign of RF pulse and gradient for excitation eddy current compensation.
  • Image reconstruction methods for readout gradient eddy current compensation.

Main Results:

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Last Updated: Jul 4, 2026

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  • Significant reduction in image quality degradation caused by eddy currents.
  • Improved R2* maps of the iceball during cryoablation.
  • Achieved echo times as short as 100 microseconds.

    • Conclusions:

    • The proposed methods effectively compensate for eddy currents during RF excitation and readout.
    • High-quality R2* mapping of frozen tissues is achievable.
    • Enhanced imaging enables better monitoring of cryoablation.