PURPOSE To develop a multishot magnetic resonance imaging (MRI) pulse sequence and reconstruction algorithm for diffusion-weighted imaging (DWI) in the brain with submillimeter in-plane resolution. MATERIALS AND METHODS A self-navigated multishot acquisition technique based on variable-density spiral k-space trajectory design was implemented on clinical MRI scanners. The image reconstruction ...

This paper extends the Weighted Low Rank Approximation (WLRA) approach towards linearly structured matrices. In the case of Hankel matrices with a special block structure an equivalent unconstrained optimization problem is derived and an algorithm for solving it is proposed.

Transmit diversity through two-transmit and one-receive antennas (DISO) with Alamouti’s Space-Time block coding (STBC) assumes the channel be flat and static over the coding block. Lindskog and Paulraj have extended this scheme for a time dispersive channel by doing the space-time coding over a large data block such as one burst. This helps to achieve diversity gain on a time-dispersive channel...

A Schauder basis (xn) of a Banach space X is said to be lower [upper] semi-homogeneous if every normalized block basic sequence of (xn) dominates [is dominated by] the basis. We show that the unit vector basis of a separable Orlicz sequence space `M , with M(1) = 1 is lower [upper] semihomogeneous if and only if M fulfils some kind of super[sub]-multiplicative inequality on the interval[0, 1]. ...