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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology
  • Radiology

Background:

  • Supine breast MRI offers potential patient comfort and alignment with treatment positions.
  • Novel flexible coil arrays enhance signal-to-noise ratio (SNR) in supine breast imaging.
  • The impact of coil and patient positioning on SNR requires further investigation.

Purpose of the Study:

  • To compare SNR between prone and supine breast MRI positions.
  • To utilize a tissue-independent metric (relative SNR) to account for tissue deformation.
  • To evaluate SNR using appropriate coils for each position.

Main Methods:

  • Proposed a relative SNR (rSNR) metric (breast coil SNR / body coil SNR).
  • Demonstrated rSNR's tissue-independence for accurate comparisons.
  • Scanned 10 female subjects, comparing rSNR in breast tissue, chest wall, and axilla for prone vs. supine positions.

Main Results:

  • Significantly higher rSNR in breast tissue and chest wall for supine positioning.
  • Axilla rSNR showed mixed results: higher in supine for 4, higher in prone for 4, no difference for 2.
  • Supine positioning placed tissue closer to the coil, yielding higher SNR within 4cm.

Conclusions:

  • Supine breast MRI using surface array coils can achieve higher SNR in most relevant regions for most subjects.
  • This finding supports the potential of supine breast MRI for improved imaging quality.
  • Optimized coil and patient positioning are crucial for maximizing SNR in breast MRI.