Apparatus And Method For Multi-Band MR Imaging

摘要

A magnetic resonance method and system are provided for providing improved multi-band (MB) magnetic resonance imaging. The adaptive MB imaging can be achieved by providing one or more modified multi-band excitation pulse sequences that include at least either one nullified “dummy” slice within a slab that is not excited simultaneously with the other slices during a single multislice acquisition sequence, or one excitation slice group that utilizes a non-uniform slice spacing between simultaneously excited slices. Adaptive GRAPPA or slice-GRAPPA kernel sizes can also be used during image reconstruction to improve speed without excessive point spread blurring or MB reconstruction failure. A total leakage factor (TLF) can also be determined based on test images using modified MB excitation sequences, and used to improve the adaptive MB procedure.

主权项

1. An MR imaging system for generating a multi-band (MB) image of a region of interest, comprising:
a radio frequency (RF) signal generator and a magnetic field gradient generator which are together configured to provide a series of RF pulse and magnetic field gradient sequences for acquisition of MB image data, and an image processing unit configured to generate the MB image of the region of interest based on the MB image data, wherein the series of RF pulse and magnetic field gradient sequences comprises at least one adaptive acquisition parameter.