| 摘要 |
Magnetic resonance is excited in selected portions of a subject disposed within a temporally uniform magnetic field of a magnetic resonance imaging system. A quadrature coil assembly (30) receives radio frequency magnetic resonance signals from the subject. Commonly, the quadrature coil fails to receive signals in true quadrature over the entire examination region. Resonance signals from a first coil (32) and a second, orthogonal coil (34) are received (40, 42), digitized (44, 46), and Fourier transformed (50, 52) into complex images. Each complex image includes an array or grid of vector data values having a magnitude and a direction or phase angle. If the quadrature coil was truly quadrature over the entire region of interest, the data values of both complex images would be a unit vectors. The vector of one image would be offset by 90 DEG from the vectors of the other. A phase correction board (54) sets the phase angle of the corresponding data values of the first and second complex images to a common vector direction or phase angle. A magnitude correction board (56) adjusts the magnitude of each corresponding data value of the first and second complex images. The phase angle and magnitude corrected complex data images are summed (58) and the real or magnitude image is stored in an image memory (62).
|
