Three-dimensional MR-encephalography: fast volumetric brain imaging using rosette trajectories.

MR-Encephalography (MREG) is a technique that allows real time observation of functional changes in the brain that appears within 100 msec. The high sampling rate is achieved at the cost of some spatial resolution. The article describes a novel imaging method for fast three-dimensional-MR-encephalography whole brain coverage based on rosette trajectories and the use of multiple small receiver coils.

Fast functional brain imaging using constrained reconstruction based on regularization using arbitrary projections.

This work describes a novel method for highly undersampled projection imaging using constrained reconstruction by Tikhonov-Phillips regularization and its application for high temporal resolution functional MRI (fMRI) at a repetition time of 80 ms. The high-resolution reference image used as in vivo coil sensitivity is acquired in a separate acquisition using otherwise identical parameters. Activation studies using a standard checkerboard activation paradigm demonstrate the inherent high sensitivity afforded by the possibility to separate activation-related effects from "physiological noise.