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公开(公告)号：US4613818A
公开(公告)日：1986-09-23
申请号：US505686
申请日：1983-06-20
申请人： Joseph H. Battocletti , Richard E. Halbach , Frederick J. Antonich , Anthony Sances, Jr. , Thomas A. Knox
发明人： Joseph H. Battocletti , Richard E. Halbach , Frederick J. Antonich , Anthony Sances, Jr. , Thomas A. Knox
CPC分类号： G01F1/716 , A61B5/0263 , G01F1/56 , G01R33/563
摘要： Blood flow in human limbs is measured non-invasively by a nuclear magnetic resonance blood flowmeter which includes a pair of polarizing magnets whose fields are stabilized by electromagnets in each pole piece that are energized in accordance with the magnetic flux of the magnets as sensed by a Hall effect sensor. Blood molecules are either self-tagged by the polarizing field or are separately tagged by a tag coil whose field is orthogonal to the polarizing field. Once tagged, the variation in the magnetic moment of the molecule due to the tagging is detected by the variation in voltage in the receiver coil which is located orthogonally to the transmitter coil so as to reduce crosscoupling therebetween. Two sets of scanner coils, one located parallel to and the other orthogonal to the polarizing field directions, respectively, are energized to create a pair of intersecting null planes which act to cancel nuclear magnetic resonance response detected by the receiver everywhere but along the line where the two null planes intersect. By varying the current in the scanner coils, the resulting line of intersection of the null planes can be moved in two dimensions so as to scan the limb thereby allowing blood flow measurement at various locations within the limb.
摘要翻译： 通过核磁共振血流量计非人侵入地测量人体肢体中的血液流量，该核磁共振血流量计包括一对偏振磁体，其磁场由每个极片中的电磁体稳定，根据磁体的磁通量被激励， 霍尔效应传感器 血液分子可以通过偏振场自标记，也可以由场线与偏振场正交的标签线圈单独标记。 一旦被标记，由于标记引起的分子磁矩的变化通过与发射器线圈正交的接收器线圈中的电压变化来检测，从而减小它们之间的交叉耦合。 两组扫描器线圈分别与偏振场方向垂直的扫描器线圈被激励，以产生一对相交的零平面，其作用是消除由接收器到处检测到的核磁共振响应，但沿着线 两个零平面相交。 通过改变扫描器线圈中的电流，可以使二维空间平面的相交线相互移动，从而扫描肢体，从而允许在肢体内的各个位置进行血流测量。
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