Efficient method for performing K-space channel combination for non-cartesian MRI acquisitions

摘要

A system and method for combining k-space data acquired on multiple different receiver channels in a multichannel receiver is provided. One or more convolution kernels are used to combine the k-space data. Each convolution kernel is designed as the combination of one or more channel combination kernels and an alias-suppressing kernel. The channel combination kernels are designed to have a smaller sample spacing than the acquired data, and the alias-suppressing kernel is designed to suppress aliasing artifacts in stopbands defined by the sample spacing of the channel combination kernels.

主权项

1. A method for combining k-space measurements made on a plurality of different receiver channels in a multichannel receiver that forms a part of a magnetic resonance imaging (MRI) system, the steps of the method comprising:
a) directing the MRI system to acquire a k-space data set for a plurality of different receiver channels in the multichannel receiver; b) forming at least one convolution kernel by combining:
i) at least one coil combination kernel having a sample spacing smaller than a sample spacing in the acquired k-space data sets; andii) an alias-suppressing kernel that is designed based on the sample spacing of the at least one coil combination kernel; c) generating channel combined data by applying the at least one convolution kernel formed in step b) to the k-space data sets acquired in step a); and d) reconstructing an image from the channel combined data generated in step c).