PURPOSE: The goal of this study is to characterize and improve the accuracy of 2D magnetic resonance fingerprinting (MRF) scans in the presence of slice profile (SP) and B1 imperfections, which are two main factors that affect quantitative results in MRF. METHODS: The SP and B1 imperfections are characterized and corrected separately. The SP effect is corrected by simulating the radiofrequency pulse in the dictionary, and the B1 is corrected by acquiring a B1 map using the Bloch-Siegert method before each scan. The accuracy, precision, and repeatability of the proposed method are evaluated in phantom studies. The effects of both SP and B1 imperfections are also illustrated and corrected in the in vivo studies. RESULTS: The SP and B1 corrections improve the accuracy of the T1 and T2 values, independent of the shape of the radiofrequency pulse. The T1 and T2 values obtained from different excitation patterns become more consistent after corrections, which leads to an improvement of the robustness of the MRF design. CONCLUSION: This study demonstrates that MRF is sensitive to both SP and B1 effects, and that corrections can be made to improve the accuracy of MRF with only a 2-s increase in acquisition time. Magn Reson Med 78:1781-1789, 2017.
PURPOSE: The goal of this study is to characterize and improve the accuracy of 2D magnetic resonance fingerprinting (MRF) scans in the presence of slice profile (SP) and B1 imperfections, which are two main factors that affect quantitative results in MRF. METHODS: The SP and B1 imperfections are characterized and corrected separately. The SP effect is corrected by simulating the radiofrequency pulse in the dictionary, and the B1 is corrected by acquiring a B1 map using the Bloch-Siegert method before each scan. The accuracy, precision, and repeatability of the proposed method are evaluated in phantom studies. The effects of both SP and B1 imperfections are also illustrated and corrected in the in vivo studies. RESULTS: The SP and B1 corrections improve the accuracy of the T1 and T2 values, independent of the shape of the radiofrequency pulse. The T1 and T2 values obtained from different excitation patterns become more consistent after corrections, which leads to an improvement of the robustness of the MRF design. CONCLUSION: This study demonstrates that MRF is sensitive to both SP and B1 effects, and that corrections can be made to improve the accuracy of MRF with only a 2-s increase in acquisition time. Magn Reson Med 78:1781-1789, 2017.
Authors: Philipp Ehses; Nicole Seiberlich; Dan Ma; Felix A Breuer; Peter M Jakob; Mark A Griswold; Vikas Gulani Journal: Magn Reson Med Date: 2012-02-29 Impact factor: 4.668
Authors: Carl Ganter; Marcus Settles; Isabel Dregely; Francesco Santini; Klaus Scheffler; Oliver Bieri Journal: Magn Reson Med Date: 2013-02-04 Impact factor: 4.668
Authors: Dan Ma; Vikas Gulani; Nicole Seiberlich; Kecheng Liu; Jeffrey L Sunshine; Jeffrey L Duerk; Mark A Griswold Journal: Nature Date: 2013-03-14 Impact factor: 49.962
Authors: Charlie Yi Wang; Simone Coppo; Bhairav Bipin Mehta; Nicole Seiberlich; Xin Yu; Mark Alan Griswold Journal: Magn Reson Med Date: 2018-10-30 Impact factor: 4.668
Authors: Zidan Yu; Tiejun Zhao; Jakob Assländer; Riccardo Lattanzi; Daniel K Sodickson; Martijn A Cloos Journal: Magn Reson Imaging Date: 2018-09-05 Impact factor: 2.546
Authors: Zhengwei Zhou; Pei Han; Bill Zhou; Anthony G Christodoulou; Jaime L Shaw; Zixin Deng; Debiao Li Journal: Magn Reson Med Date: 2018-05-30 Impact factor: 4.668
Authors: Eva M Serrao; Dimitri A Kessler; Bruno Carmo; Lucian Beer; Kevin M Brindle; Guido Buonincontri; Ferdia A Gallagher; Fiona J Gilbert; Edmund Godfrey; Martin J Graves; Mary A McLean; Evis Sala; Rolf F Schulte; Joshua D Kaggie Journal: Sci Rep Date: 2020-10-16 Impact factor: 4.379