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Factorized sensitivity estimation for artifact suppression in phase-cycled bSSFP MRI.
NMR in Biomedicine ( IF 2.7 ) Pub Date : 2020-01-27 , DOI: 10.1002/nbm.4228 Erdem Bıyık 1, 2, 3 , Kübra Keskin 3, 4 , Salman Uh Dar 3, 4 , Aykut Koç 2, 3, 4 , Tolga Çukur 3, 4, 5
NMR in Biomedicine ( IF 2.7 ) Pub Date : 2020-01-27 , DOI: 10.1002/nbm.4228 Erdem Bıyık 1, 2, 3 , Kübra Keskin 3, 4 , Salman Uh Dar 3, 4 , Aykut Koç 2, 3, 4 , Tolga Çukur 3, 4, 5
Affiliation
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OBJECTIVE
Balanced steady-state free precession (bSSFP) imaging suffers from banding artifacts in the presence of magnetic field inhomogeneity. The purpose of this study is to identify an efficient strategy to reconstruct banding-free bSSFP images from multi-coil multi-acquisition datasets.
METHOD
Previous techniques either assume that a naïve coil-combination is performed a priori resulting in suboptimal artifact suppression, or that artifact suppression is performed for each coil separately at the expense of significant computational burden. Here we propose a tailored method that factorizes the estimation of coil and bSSFP sensitivity profiles for improved accuracy and/or speed.
RESULTS
In vivo experiments show that the proposed method outperforms naïve coil-combination and coil-by-coil processing in terms of both reconstruction quality and time.
CONCLUSION
The proposed method enables computationally efficient artifact suppression for phase-cycled bSSFP imaging with modern coil arrays. Rapid imaging applications can efficiently benefit from the improved robustness of bSSFP imaging against field inhomogeneity.
中文翻译：
用于相周期bSSFP MRI中伪影抑制的因式分解灵敏度估计。
目的平衡稳态自由进动（bSSFP）成像在磁场不均匀的情况下会出现带状伪影。本研究的目的是确定一种有效的策略，以从多线圈多采集数据集中重建无带状bSSFP图像。方法先前的技术要么假设先验地进行了线圈组合，先导致了次优的伪影抑制，要么分别对每个线圈进行了伪影抑制，但代价是计算量大。在这里，我们提出了一种量身定制的方法，该方法可将线圈和bSSFP灵敏度曲线的估计因子化，以提高准确性和/或速度。结果体内实验表明，该方法在重建质量和时间上均优于单纯的线圈组合和逐线圈处理。结论所提出的方法能够有效地抑制具有现代线圈阵列的相位循环bSSFP成像的伪影。快速成像应用可以有效地受益于bSSFP成像针对场非均匀性而提高的鲁棒性。
更新日期：2020-03-09
中文翻译：
用于相周期bSSFP MRI中伪影抑制的因式分解灵敏度估计。
目的平衡稳态自由进动（bSSFP）成像在磁场不均匀的情况下会出现带状伪影。本研究的目的是确定一种有效的策略，以从多线圈多采集数据集中重建无带状bSSFP图像。方法先前的技术要么假设先验地进行了线圈组合，先导致了次优的伪影抑制，要么分别对每个线圈进行了伪影抑制，但代价是计算量大。在这里，我们提出了一种量身定制的方法，该方法可将线圈和bSSFP灵敏度曲线的估计因子化，以提高准确性和/或速度。结果体内实验表明，该方法在重建质量和时间上均优于单纯的线圈组合和逐线圈处理。结论所提出的方法能够有效地抑制具有现代线圈阵列的相位循环bSSFP成像的伪影。快速成像应用可以有效地受益于bSSFP成像针对场非均匀性而提高的鲁棒性。
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