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Breast density assessment using a 3T MRI system: comparison among different sequences.

Alberto Tagliafico1, Bianca Bignotti2, Giulio Tagliafico3

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Different MRI sequences yield varying breast density measurements. T1-weighted sequences closely align with Iterative Decomposition of water and fat with Echo Asymmetry and Least squares estimation (IDEAL) sequences for accurate breast density assessment.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Accurate breast density measurement is crucial for breast cancer risk assessment.
  • Magnetic Resonance Imaging (MRI) offers advanced capabilities for breast density evaluation.
  • Standardization of MRI sequences for breast density is needed.

Purpose of the Study:

  • To compare various MRI sequences for breast density quantification.
  • To evaluate Iterative Decomposition of water and fat with Echo Asymmetry and Least squares estimation (IDEAL) as a reference standard.
  • To assess breast density measurements on a 3T MRI system.

Main Methods:

  • 46 women underwent 3T MRI scans during days 5-15 of their menstrual cycle.
  • MRI sequences included T1-tSE, T2-tSE, VIBRANT, and IDEAL (FatOnly and WaterOnly).
  • Semi-automated software calculated breast density; non-parametric tests analyzed differences.

Main Results:

  • Mean breast density percentages varied across sequences (e.g., T1-tSE 56%, T2-tSE 52%, VIBRANT 55%).
  • Significant differences were found between T2-tSE and T1-tSE/VIBRANT, and T1-tSE and IDEAL sequences.
  • High positive linear correlation (r ≥ 0.93) observed among all sequences.

Conclusions:

  • MRI sequences demonstrate variability in breast density percentage measurements.
  • T1-weighted sequences show similar results to IDEAL sequences for breast density assessment.
  • Further standardization may be needed for consistent breast density evaluation.