External Dynamic InTerference Estimation and Removal (EDITER) for low field MRI.
External Dynamic InTerference Estimation and Removal (EDITER) for low field MRI.
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DOI：
10.1002/mrm.28992
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发表时间：
2022-03
影响因子：
3.3
通讯作者：
Cooley CZ
中科院分区：
文献类型：
--
作者：
Srinivas SA;Cauley SF;Stockmann JP;Sappo CR;Vaughn CE;Wald LL;Grissom WA;Cooley CZ
护理点MRI需要在法拉第屏蔽的房间外操作，通常用于阻止图像降解电磁干扰（EMI）。为了解决这个问题，我们介绍了Editer方法，这是一种基于外部传感器的方法，可追溯从随着时变的外部干扰源中删除图像伪像。
该方法与图像数据采集期间和之间的主要MR线圈同时，从多个EMI检测器（调谐接收线圈以及未调节的电极）同时获得数据。我们对脉冲响应进行动态计算功能，以将数据从检测器映射到变化的伪影的时间，然后从MR数据中删除被转换的被检测到的EMI。在受控的EMI环境中，在幻影和体内成像实验中评估了编辑算法的性能，并在不受控制的EMI设置中使用开放的47.5MT MRI扫描仪进行了评估。
在受控的环境中，对于引入的特定类型的EMI来源，已证明了编辑技术的有效性，其中结构化EMI的降低了97％，并且在Phantom实验中降低了76％的宽带EMI。在不受控制的EMI实验中，我们证明了使用电极和拾取线圈在体内的EMI降低高达99％。我们通过该方法证明了图像SNR的9倍改进。
编辑技术是一种灵活而健壮的方法，可在具有最小的被动屏蔽的便携式MRI系统中提高图像质量，并且可以减少MRI对屏蔽房间的依赖，并允许真正的便携式MRI。
Point-of-care MRI requires operation outside of Faraday shielded rooms normally used to block image-degrading electromagnetic Interference (EMI). To address this, we introduce the EDITER method, an external sensor-based method to retrospectively remove image artifacts from time-varying external interference sources. The method acquires data from multiple EMI detectors (tuned receive coils as well as untuned electrodes placed on the body) simultaneously with the primary MR coil during and between image data acquisition. We calculate impulse response functions dynamically that map the data from the detectors to the time varying artifacts then remove the transformed detected EMI from the MR data. Performance of the EDITER algorithm was assessed in phantom and in vivo imaging experiments in an 80mT portable brain MRI in a controlled EMI environment and with an open 47.5mT MRI scanner in an uncontrolled EMI setting. In the controlled setting, the effectiveness of the EDITER technique was demonstrated for specific types of introduced EMI sources with up to a 97% reduction of structured EMI and up to 76% reduction of broadband EMI in phantom experiments. In the uncontrolled EMI experiments, we demonstrate EMI reductions of up to 99% using an electrode and pick-up coil in-vivo. We demonstrate up to a 9-fold improvement in image SNR with the method. The EDITER technique is a flexible and robust method to improve image quality in portable MRI systems with minimal passive shielding and could reduce the reliance of MRI on shielded rooms and allow for truly portable MRI.
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影响因子：
3.3
作者：
Graedel, Nadine N.;Polimeni, Jonathan R.;Guerin, Bastien;Gagoski, Borjan;Wald, Lawrence L.
通讯作者：
Wald, Lawrence L.
影响因子：
2.2
作者：
Coffey, Aaron M.;Feldman, Matthew A.;Chekmenev, Eduard Y.
通讯作者：
Chekmenev, Eduard Y.
影响因子：
3.3
作者：
Griswold, MA;Jakob, PM;Haase, A
通讯作者：
Haase, A
影响因子：
3.3
作者：
Breuer, FA;Kellman, P;Jakob, PM
通讯作者：
Jakob, PM
DOI：
10.1007/s10334-016-0525-8
发表时间：
2016-08
期刊：
Magma (New York, N.Y.)
影响因子：
--
作者：
Lother S;Schiff SJ;Neuberger T;Jakob PM;Fidler F
通讯作者：
Fidler F