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Cardiac thrombus detection is better with contrast-enhanced MRI images than with T1 and T2 mapping sequences. While mapping shows potential, contrast imaging remains superior for visualizing thrombus.

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Area of Science:

  • Cardiovascular MRI
  • Medical Imaging Analysis

Background:

  • Cardiac thrombus detection is crucial for stroke prevention.
  • Contrast-enhanced MRI is the current standard for thrombus visualization.
  • T1 and T2 mapping sequences offer potential non-contrast alternatives.

Purpose of the Study:

  • To compare the diagnostic performance of T1/T2 mapping sequences versus contrast-enhanced MRI for cardiac thrombus detection.
  • To evaluate signal-to-noise ratios (SNRs) and contrast-to-noise ratios (CNRs) for thrombus visualization.

Main Methods:

  • Retrospective analysis of MRI scans from 22 patients with cardiac thrombus.
  • Quantitative assessment of SNR and CNR for thrombus, blood pool, and myocardium.
  • Comparison of values obtained from T1 maps, T2 maps, and contrast-enhanced images (early and late gadolinium).

Main Results:

  • Distinguishability of thrombus from surrounding tissues was superior on early (EGE) and late gadolinium-enhanced (LGE) images compared to T1 and T2 maps.
  • Mean CNRs were highest for EGE, followed by LGE, and then mapping sequences.
  • CNR values for EGE and LGE consistently outperformed mapping sequences.

Conclusions:

  • Contrast-enhanced MRI remains the superior method for cardiac thrombus detection.
  • Native mapping sequences show promise but are currently less effective than contrast imaging.
  • Further research is needed to optimize non-contrast mapping techniques for thrombus evaluation.