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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Apparent tissue sodium concentration quantification across reconstruction methods with different partial volume

Olgica Zaric1, Carmen Leser2, Vladimir Juras3

  • 1Research Centre for Medical Imaging and Image Analysis (MIAAI), Danube Private University, Krems, Austria; Institute for Musculoskeletal Imaging, Karl Landsteiner Society, St. Pölten, Austria.

Zeitschrift Fur Medizinische Physik
|May 6, 2026
PubMed
Summary
This summary is machine-generated.

Compressed sensing (CS) techniques improve sodium (23Na) MRI quality by reducing partial volume effects (PVE). The anatomically guided total variation (AG-TV) method demonstrated superior performance in breast tumor imaging and apparent tissue sodium concentration (aTSC) quantification.

Keywords:
Apparent tissue sodium concentrationBreast cancerCompressed sensingImage reconstructionPartial volume effectsSodium magnetic resonance imaging

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Radiology

Background:

  • Partial volume effects (PVE) in sodium (23Na) MRI lead to errors in apparent tissue sodium concentration (aTSC) quantification.
  • Compressed sensing (CS) reconstruction algorithms offer potential for PVE reduction and improved image quality in 23Na-MRI.

Purpose of the Study:

  • To evaluate the feasibility of CS-based reconstruction techniques for enhancing 23Na-MRI image quality.
  • To assess differences in aTSC quantification based on various image reconstruction methods.

Main Methods:

  • 23Na-MRI scans were acquired on a 7T scanner from healthy participants and breast cancer patients.
  • Images were reconstructed using weighted total variation (wTV), directional total variation (dTV), anatomically guided total variation (AG-TV), and adaptive combine (ADC) methods.
  • Tumor volume consistency (Dice score) and aTSC were quantified and compared across reconstruction methods using Wilcoxon signed-rank tests.

Main Results:

  • All CS methods preserved sodium signal and tissue structures.
  • AG-TV and ADC methods yielded higher mean aTSC values in glandular, adipose, and tumor tissues compared to wTV and dTV.
  • AG-TV demonstrated significantly higher Dice scores for tumor delineation and significantly different aTSC values compared to wTV and dTV (p<0.001).

Conclusions:

  • Breast tumor appearance and aTSC estimations are significantly influenced by the chosen reconstruction method, attributed to varying PVE reduction.
  • The anatomically guided total variation (AG-TV) method exhibited the most favorable performance for 23Na-MRI of breast tumors.