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Supine breast MRI shows potential but presents challenges. Imaging in the supine position can increase B0 field inhomogeneities and B1+ variations compared to prone positioning, requiring further coil development.

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Area of Science:

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

Background:

  • Supine breast MRI offers potential advantages over prone positioning, including improved efficiency, image quality, alignment with clinical procedures, and accessibility.
  • However, technical challenges associated with supine breast MRI need to be characterized to optimize its clinical implementation.

Purpose of the Study:

  • To investigate and quantify the technical challenges of supine breast MRI.
  • Specific challenges examined include B0 field inhomogeneities, B1+ variations, respiratory-induced breast motion, and supine breast geometry.

Main Methods:

  • Ten healthy subjects underwent 3T MRI scans in both prone and supine positions to compare B0 and B1+ parameters.
  • Respiratory motion was assessed in the supine position.
  • Breast shape metrics were analyzed from image volumes of 40 subjects (healthy volunteers and patients) to characterize supine breast geometry.

Main Results:

  • B0 field inhomogeneity increased in the supine position (2SD: 152 ± 15 Hz) compared to the prone position (2SD: 122 ± 25 Hz).
  • B1+ flip angle variations were greater in the supine position (2SD: 7–13°) than in the prone position (2SD: 6–8°).
  • Breast tissue displacement due to respiration was similar in anterior-posterior and right-left directions; breast geometry exhibited significant variation.

Conclusions:

  • Supine breast MRI may result in increased B0 inhomogeneities and B1+ variations compared to prone positioning.
  • Substantial breast motion can occur in the supine position.
  • Characterizing diverse breast geometries is crucial for developing specialized coils for supine breast MRI.