Patent ID: 9134394
Filing Date: 2015-09-15
Classification: A61B,G01R

Abstract:
1. A magnetic resonance imaging (MRI) apparatus comprising: an assembly of MRI gantry components including static and gradient magnetic field generators and at least one radio frequency (RF) coil defining an imaging volume; an MRI control system, connected to control said gantry components, including at least one RF transmitter, at least one RF receiver and computer control circuits connected to effect specified MRI data acquisition sequences of RF and gradient magnetic pulses which acquire, from an object located within said imaging volume, RF nuclear magnetic resonance (NMR) spin responses emanating from different spatially located volumes of NMR nuclei respectively corresponding to different positions in k-space as a function of a magnetic field experienced by the nuclei; said computer control circuits being connected to: wherein a k-space data set which includes both k-space data in a low-frequency region and k-space data in a high-frequency region is acquired only for one image data set of the three or more non-contrast-enhanced MRA image data sets, the one image data set corresponding to a longest delay time of the three or more corresponding different delay times, wherein k-space data sets which include k-space data only in a low-frequency region are acquired for all other image data sets of the three or more non-contrast enhanced MRA image data sets, the other image data sets corresponding to delay times other than the longest delay time, and wherein the three or more non-contrast-enhanced MRA image data sets are reconstructed after copying the k-space data in the high-frequency region acquired at the longest delay time into a high-frequency region of each of the k-space data sets acquired at delay times other than the longest delay time.