K-t FASTER: Acceleration of functional MRI data acquisition using low rank constraints.

ABSTRACT:

Purpose

In functional MRI (fMRI), faster sampling of data can provide richer temporal information and increase temporal degrees of freedom. However, acceleration is generally performed on a volume-by-volume basis, without consideration of the intrinsic spatio-temporal data structure. We present a novel method for accelerating fMRI data acquisition, k-t FASTER (FMRI Accelerated in Space-time via Truncation of Effective Rank), which exploits the low-rank structure of fMRI data.

Theory and methods

Using matrix completion, 4.27× retrospectively and prospectively under-sampled data were reconstructed (coil-independently) using an iterative nonlinear algorithm, and compared with several different reconstruction strategies. Matrix reconstruction error was evaluated; a dual regressi

SUBMITTER: Chiew M 

PROVIDER: S-EPMC4682483 | biostudies-literature | 2015 Aug

REPOSITORIES: biostudies-literature