公开(公告)号：US5773975A

公开(公告)日：1998-06-30

申请号：US718807

申请日：1996-09-24

申请人： Jan F. L. De Becker ,  Thomas L. M. Hoogenboom ,  Miha Fuderer

发明人： Jan F. L. De Becker ,  Thomas L. M. Hoogenboom ,  Miha Fuderer

IPC分类号： G01N24/00 ,  A61B5/055 ,  G01R33/48 ,  G01R33/563 ,  G01V3/00

CPC分类号： G01R33/56308 ,  G01R33/56316

摘要： A method of determining a velocity of moving matter by magnetic resonance, includes a application of a phase contrast method in at least one measuring direction so as to determine a velocity. Upon determination of the velocity by means of phase contrast MRA, the cyclic nature of the phase introduces an ambiguity in the velocity determination. This ambiguity is removed by performing an additional measurement in an additional direction and by combining the velocity measured in the additional direction with the previously determined velocity. It has also been found that there is an optimum direction for this additional measurement. The advantage of the method of the invention is that the velocities can be determined and corrected in the three basic directions. As a result, low flow velocities can be determined and corrected in the three basic directions. As a result, low flow velocities can be measured, so that slow liquid flows in small blood vessels can be made visible in an MR image.

摘要翻译： 通过磁共振确定移动物体的速度的方法包括在至少一个测量方向上应用相位对比方法以确定速度。 在通过相位对比度MRA确定速度时，相位的循环特性在速度确定中引入了歧义。 通过在附加方向上执行额外的测量并且将在附加方向上测量的速度与先前确定的速度组合来消除这种模糊性。 还已经发现，对于该附加测量，存在最佳方向。 本发明的方法的优点在于可以在三个基本方向上确定和校正速度。 结果，可以在三个基本方向上确定和校正低流速。 结果，可以测量低流速，使得在MR图像中可以使在小血管中流动的液体缓慢。