Abstract #3482

Active shimming of the lung for mitigation of bSSFP banding artifacts at high fields

Pavlos Panos^1,2, Grzegorz Bauman^1,2, and Oliver Bieri ^1,2

¹Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland, ²Department of Radiology, Division of Radiological Physics, University Hospital Basel, Basel, Switzerland

Synopsis

Keywords: Shims, Lung, Active Shimming, bSSFP, 3T

Motivation: Balanced steady state free precession (bSSFP) has shown excellent promise for structural and functional lung MRI but is limited at high fields due to prominent off-resonances.

Goal(s): To evaluate the potential of active shimming of the lung to mitigate off-resonance related artifacts for imaging the lung with bSSFP.

Approach: Using sub-millisecond TE, volumetric field maps of the lung were generated at 3T in healthy volunteers. Active shimming of lung tissue is performed off-line.

Results: Predefined active shimming of the lung resulted in an increased field homogeneity and improved results for functional lung MRI with bSSFP at 3T.

Impact: This work shows the potential of dedicated active shimming methods of the lung to mitigate off-resonance related image artifacts for bSSFP-based structural and functional MRI of the lung at high fields.

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