Abstract #4215
Highly Accelerated SEMAC for MRI of Arthroplasty Implants: Comparison with optimized TSE and conventional SEMAC
Jan Fritz 1 , Gaurav Thawait 1 , Shadpour Demehri 1 , Shivani Ahlawat 1 , Heiko Meyer 2 , Wesley Gilson 3 , Esther Raithel 2 , and Mathias Nittka 2
1
Russell H. Morgan Department of Radiology
and Radiological Science, Johns Hopkins University
School of Medicine, Baltimore, MD, United States,
2
Healthcare
Sector, Siemens AG, Bavaria, Germany,
3
Siemens
Healthcare USA, Baltimore, United States
Slice-encoding metal artifact correction (SEMAC) affords
powerful metal artifact reduction, but may be considered
impractical due to long acquisition times. The inherent
sparsity of SEMAC data, however, offers potential for
substantial acceleration through the use of
pseudo-randomized k-space undersampling and iterative
reconstruction. We show the clinical usability of a
highly accelerated TSE SEMAC sequence prototype
employing incoherent k-space undersampling and iterative
reconstruction resulting in shortening of the
acquisition time by 50-60% when compared to standard TSE
SEMAC sequences and comparable image quality.
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