发明名称 |
System and method for measuring, estimating and displaying rms current density maps |
摘要 |
A method of performing synthetic aperture magnetometery on the signals from a target organ using an array of biomagnetic sensors positioned in a predetermined manner around the target organ, each sensor in the array having a position vector and an orientation vector relative to a common coordinate system encompassing the target organ. The method includes the steps of: simultaneously measuring EM signals from each sensor positioned in the array for a selected time interval; computing a covariance matrix of the measured EM signals over a user-selected time sub-interval within the selected time interval; selecting a set of coordinates for a region of interest to be imaged and a distance between voxels to form a grid of voxels; computing a forward solution for a current element at each of the voxels for each of the sensors in the array sensors; computing an RMS current density estimate for each voxel from the covariance matrix and the forward solution for that voxel; and displaying the voxels estimating RMS current density as a first image. The method is particularly well suited for evaluating brain activity in a human subject. |
申请公布号 |
AU2043699(A) |
申请公布日期 |
1999.08.09 |
申请号 |
AU19990020436 |
申请日期 |
1999.01.20 |
申请人 |
CTF SYSTEMS INC. |
发明人 |
STEPHEN ELLIS ROBINSON |
分类号 |
A61B5/05;A61B5/04;A61B5/0476;G06K9/00 |
主分类号 |
A61B5/05 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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