Motion correction methods for MRS: experts' consensus recommendations.
Motion correction methods for MRS: experts' consensus recommendations.
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MRS的运动校正方法：专家的共识建议。
DOI：
10.1002/nbm.4364
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发表时间：
2021-05
影响因子：
2.9
通讯作者：
van der Kouwe A
中科院分区：
文献类型：
--
作者：
Andronesi OC;Bhattacharyya PK;Bogner W;Choi IY;Hess AT;Lee P;Meintjes EM;Tisdall MD;Zaitzev M;van der Kouwe A
与MRI相比，由于固有的低信噪比和对高度均匀B 0场的需求而导致的长采集时间使得磁共振波谱（MRS）特别容易受到运动或扫描仪不稳定性的影响。运动引起的定位和匀场的变化（即，B 0均匀性）降低MRS数据质量。为了减轻运动的影响，可以采用三种方法：1）对象固定，2）回顾性校正，以及3）使用内部和/或外部跟踪方法的前瞻性实时校正。前瞻性实时校正方法可以同时更新定位和B 0场，以提高MRS数据质量。虽然定位误差可以用内部（导航器）和外部（光学相机、NMR探头）跟踪方法来校正，但是B 0场校正需要内部导航器方法来测量成像体积内的B 0场，并且需要能够真实的更新扫描仪匀场硬件。内部和外部跟踪可以快速更新MRS定位，具有亚毫米和亚度精度，而扫描器频率和扫描器硬件的一阶导数可以通过内部方法在每次序列重复时更新。这些方法是最发达的神经成像，其中刚性变换是主要适用的。实时校正极大地提高了MRS采集和量化的稳定性，如对易运动受试者（包括儿童和运动障碍患者）的临床研究所示，能够稳健地测量代谢物信号，包括低浓度的代谢物信号，如γ-氨基丁酸（GABA）和谷胱甘肽（GSH）。因此，建议对MR用户进行运动校正，并呼吁MR扫描仪制造商更紧密地集成此类方法并更广泛地使用此类方法。
Long acquisition times due to intrinsically low signal-to-noise and the need for highly homogeneous B0 field make magnetic resonance spectroscopy (MRS) particularly susceptible to motion or scanner instability compared to MRI. Motion induced changes in both localization and shimming (i.e., B0 homogeneity) degrade MRS data quality. To mitigate the effects of motion three approaches can be employed: 1) subject immobilization, 2) retrospective correction, and 3) prospective real-time correction using internal and/or external tracking methods. Prospective real-time correction methods can simultaneously update localization and the B0 field to improve MRS data quality. While localization errors can be corrected with both internal (navigators) and external (optical camera, NMR probes) tracking methods, the B0 field correction requires internal navigator methods to measure the B0 field inside the imaged volume and the possibility to update the scanner shim hardware in real time. Internal and external tracking can rapidly update the MRS localization with sub-millimeter and sub-degree precision, while scanner frequency and 1st order shims of scanner hardware can be updated by internal methods every sequence repetition. These approaches are most well-developed for neuroimaging, for which rigid transformation is primarily applicable. Real-time correction greatly improves the stability of MRS acquisition and quantification as shown in clinical studies on subjects prone to motion, including children and patients with movement disorders, enabling robust measurement of metabolite signals including those with low concentrations, such as gamma-aminobutyric acid (GABA) and glutathione (GSH). Thus, motion correction is recommended for MRS users and calls for tighter integration and wider availability of such methods by MR scanner manufacturers.
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DOI：
10.1002/jmri.25139
发表时间：
2016-08
期刊：
Journal of magnetic resonance imaging : JMRI
影响因子：
--
作者：
Donadieu M;Le Fur Y;Lecocq A;Maudsley AA;Gherib S;Soulier E;Confort-Gouny S;Pariollaud F;Ranjeva MP;Pelletier J;Guye M;Zaaraoui W;Audoin B;Ranjeva JP
通讯作者：
Ranjeva JP
影响因子：
16.6
作者：
Andronesi OC;Arrillaga-Romany IC;Ly KI;Bogner W;Ratai EM;Reitz K;Iafrate AJ;Dietrich J;Gerstner ER;Chi AS;Rosen BR;Wen PY;Cahill DP;Batchelor TT
通讯作者：
Batchelor TT
影响因子：
3.3
作者：
Coutts, GA;Gilderdale, DJ;DeSouza, NM
通讯作者：
DeSouza, NM
DOI：
10.1097/01.rmr.0000136558.09801.dd
发表时间：
2004-08-01
期刊：
Topics in magnetic resonance imaging : TMRI
影响因子：
--
作者：
Blaimer, Martin;Breuer, Felix;Jakob, Peter M
通讯作者：
Jakob, Peter M
影响因子：
4.8
作者：
Dold, Christian;Zaitsev, Maxim;Sakas, Georgios
通讯作者：
Sakas, Georgios