Density-weighted concentric circle trajectories for high resolution brain magnetic resonance spectroscopic imaging at 7T.

ABSTRACT:

Purpose

Full-slice magnetic resonance spectroscopic imaging at ≥7 T is especially vulnerable to lipid contaminations arising from regions close to the skull. This contamination can be mitigated by improving the point spread function via higher spatial resolution sampling and k-space filtering, but this prolongs scan times and reduces the signal-to-noise ratio (SNR) efficiency. Currently applied parallel imaging methods accelerate magnetic resonance spectroscopic imaging scans at 7T, but increase lipid artifacts and lower SNR-efficiency further. In this study, we propose an SNR-efficient spatial-spectral sampling scheme using concentric circle echo planar trajectories (CONCEPT), which was adapted to intrinsically acquire a Hamming-weighted k-space, thus termed density-weighted-CONCE

SUBMITTER: Hingerl L 

PROVIDER: S-EPMC5873433 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature