公开(公告)号：US20090261826A1

公开(公告)日：2009-10-22

申请号：US11570357

申请日：2005-07-21

申请人： Alexander Pines ,  Dimitrios Sakellariou ,  Carlos A. Meriles ,  Andreas H. Trabesinger

发明人： Alexander Pines ,  Dimitrios Sakellariou ,  Carlos A. Meriles ,  Andreas H. Trabesinger

IPC分类号： G01R33/44

CPC分类号： G01R33/445

摘要： A method and system of magnetic resonance imaging does not need a large homogenous field to truncate a gradient field. Spatial information is encoded into the spin magnetization by allowing the magnetization to evolve in a non-truncated gradient field and inducing a set of 180 degree rotations prior to signal acquisition.

摘要翻译： 磁共振成像的方法和系统不需要大的均匀场来截断梯度场。 通过允许磁化在非截断梯度场中演化并在信号获取之前引起一组180度旋转，将空间信息编码为自旋磁化。

公开(公告)号：US07466132B2

公开(公告)日：2008-12-16

申请号：US11740339

申请日：2007-04-26

申请人： John Clarke ,  Alexander Pines ,  Robert F. McDermott ,  Andreas H. Trabesinger

发明人： John Clarke ,  Alexander Pines ,  Robert F. McDermott ,  Andreas H. Trabesinger

IPC分类号： G01V3/00

CPC分类号： G01R33/326 ,  G01R33/0356 ,  G01R33/445

摘要： Nuclear magnetic resonance (NMR) signals are detected in microtesla fields. Prepolarization in millitesla fields is followed by detection with an untuned dc superconducting quantum interference device (SQUID) magnetometer. Because the sensitivity of the SQUID is frequency independent, both signal-to-noise ratio (SNR) and spectral resolution are enhanced by detecting the NMR signal in extremely low magnetic fields, where the NMR lines become very narrow even for grossly inhomogeneous measurement fields. MRI in ultralow magnetic field is based on the NMR at ultralow fields. Gradient magnetic fields are applied, and images are constructed from the detected NMR signals.

摘要翻译： 核磁共振（NMR）信号在微量场中检测。 随后用毫米级直流超导量子干涉仪（SQUID）磁力计检测millitesla场的预偏振。 由于SQUID的灵敏度是频率无关的，所以通过检测极低磁场中的NMR信号来提高信噪比（SNR）和光谱分辨率，即使对于非常不均匀的测量场，NMR线也变得非常窄。 超低磁场中的MRI是基于超低场的NMR。 应用梯度磁场，并根据检测到的NMR信号构建图像。

公开(公告)号：US07750633B2

公开(公告)日：2010-07-06

申请号：US11570357

申请日：2005-07-21

申请人： Alexander Pines ,  Dimitrios Sakellariou ,  Carlos A. Meriles ,  Andreas H. Trabesinger

发明人： Alexander Pines ,  Dimitrios Sakellariou ,  Carlos A. Meriles ,  Andreas H. Trabesinger

IPC分类号： G01V3/00

CPC分类号： G01R33/445

摘要： A method and system of magnetic resonance imaging does not need a large homogenous field to truncate a gradient field. Spatial information is encoded into the spin magnetization by allowing the magnetization to evolve in a non-truncated gradient field and inducing a set of 180 degree rotations prior to signal acquisition.

摘要翻译： 磁共振成像的方法和系统不需要大的均匀场来截断梯度场。 通过允许磁化在非截断梯度场中演化并在信号获取之前引起一组180度旋转，将空间信息编码为自旋磁化。