| 摘要 |
<p>The invention relates to a device for MRI of a body (7) placed in an examination volume. The device (1) comprises means (2) for establishing a substantially homogeneous main magnetic field in the examination volume, means (3, 4, 5) for generating switched magnetic field gradients superimposed upon the main magnetic field, means (6) for radiating RF pulses towards the body (7), control means (12) for controlling the generation of the magnetic field gradients and the RF pulses, means (10) for receiving and sampling MR signals, and reconstruction means (14) for forming MR images from the signal samples. According to one aspect of the invention, the device (1) is arranged to acquire a plurality of k-space blades according to the PROPELLER scheme, the k-space blades being rotated about a center of k-space, wherein the rotation angle of the k-space blades is incremented during MR signal acquisition by the Golden Angle (or by the half Golden Angle). According to another aspect of the invention, the device (1) is arranged to acquire an MR reference data set from a central portion of k-space prior to a multi-slice PROPELLER acquisition. According to still another aspect of the invention, the device (1) is arranged to weight the acquired MR data, wherein weighting factors are computed on the basis of acquisition times for contrast manipulation, correlation measures for motion compensation, and on the basis of the geometry of the overlapping areas of the k-space blades.</p> |
