期刊
MAGNETIC RESONANCE IN MEDICINE
卷 69, 期 6, 页码 1501-1511出版社
WILEY
DOI: 10.1002/mrm.24399
关键词
lipid suppression; chemical shift imaging; compressed sensing
资金
- National Institutes of Health [NIH R01 EB007942]
- National Science Foundation [0643836]
- Siemens Healthcare (The Siemens-MIT Alliance)
- CIMIT-MIT Medical Engineering Fellowship
- Division of Computing and Communication Foundations
- Direct For Computer & Info Scie & Enginr [0643836] Funding Source: National Science Foundation
Mapping 1H brain metabolites using chemical shift imaging is hampered by the presence of subcutaneous lipid signals, which contaminate the metabolites by ringing due to limited spatial resolution. Even though chemical shift imaging at spatial resolution high enough to mitigate the lipid artifacts is infeasible due to signal-to-noise constraints on the metabolites, the lipid signals have orders of magnitude of higher concentration, which enables the collection of high-resolution lipid maps with adequate signal-to-noise. The previously proposed dual-density approach exploits this high signal-to-noise property of the lipid layer to suppress truncation artifacts using high-resolution lipid maps. Another recent approach for lipid suppression makes use of the fact that metabolite and lipid spectra are approximately orthogonal, and seeks sparse metabolite spectra when projected onto lipid-basis functions. This work combines and extends the dual-density approach and the lipid-basis penalty, while estimating the high-resolution lipid image from 2-average k-space data to incur minimal increase on the scan time. Further, we exploit the spectral-spatial sparsity of the lipid ring and propose to estimate it from substantially undersampled (acceleration R = 10 in the peripheral k-space) 2-average in vivo data using compressed sensing and still obtain improved lipid suppression relative to using dual-density or lipid-basis penalty alone. Magn Reson Med, 2013. (c) 2012 Wiley Periodicals, Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据