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Motion-resolved and free-breathing liver MRF.

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This study presents a new motion-resolved magnetic resonance fingerprinting (MRF) method for free-breathing liver imaging. The developed protocol achieves accurate T1 and T2 mapping, overcoming motion artifacts in liver scans.

Keywords:
Free-breathing MRFIterative reconstructionLiver MRFMRF reconstructionProstate MRF

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Radiology

Background:

  • Liver magnetic resonance fingerprinting (MRF) is crucial for tissue characterization.
  • Free-breathing techniques are desirable to improve patient comfort and reduce scan time.
  • Motion artifacts can significantly degrade the quality of liver MRF data.

Purpose of the Study:

  • To develop and validate a motion-resolved and free-breathing liver MRF protocol.
  • To enable accurate T1 and T2 mapping of the liver during free breathing.

Main Methods:

  • Deformation maps were derived from MRF data and incorporated into the reconstruction.
  • A sliding window reconstruction with L1 wavelet regularization was employed.
  • The protocol was tested on four healthy volunteers with specific imaging parameters.

Main Results:

  • The developed method achieved a nominal frame rate of 2.5 Hz for motion-resolved imaging.
  • Accuracy of deformation maps was validated with a normalized root mean square error (NRMSE) of 0.19.
  • T1 and T2 values obtained were consistent with previous reports, showing low NRMSEs (0.13 for T1, 0.18 for T2) compared to breath-hold MRF.

Conclusions:

  • A motion-resolved MRF protocol for free-breathing liver imaging was successfully demonstrated.
  • The method effectively corrects for motion, enabling accurate liver parameter quantification.
  • This technique holds promise for improved liver MRI diagnostics without breath-holding requirements.