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Activities and Seminars

Wolf Blecher, Max Planck Institute for Biological Cybernetics
 
Date: Aug 05, 2011

What: Acoustic noise reduced acquisition and nonlinear image reconstruction


What: Acoustic noise reduced acquisition and nonlinear image reconstruction

When: Friday, August 5th, 4:00pm

Who: Wolf Blecher, Max Planck Institute for Biological Cybernetics, Tuebingen, Germany

Where: BCBL, Paseo Mikeletegi 69, Floor 2.

Summary:

Acoustic noise reduction of MR image acquisition is a topic that has not gained much attention since the invention of MR. With the trend to higher field strength acoustic noise becomes more severe. Acoustic noise is not an annoyance to the subject in the scanner or the operator, but has an influence on functional MRI scans due to crossmodal effects. Recent developments like parallel imaging techniques or nonlinear reconstruction have been shown to be able to reduce the acoustic noise during imaging but more as a by product than with the aim of reducing acoustic noise in first place. In the first part of the talk, I will present the Hilbert-Moore sequence, a pulse sequence for image acquisition based on self-similar k-space trajectories design to reduce acoustic noise during image acquisition. The second part of the talk deals with the application of the nonlinear reconstruction framework to Gradient REcalled Echo Planar Imaging (GRE EPI) and presents our model that allows sparse acquisition/reconstruction of EPI data. Finally I will introduce some ideas on how to combine self-similar k-space trajectories and nonlinear reconstruction to develop a new pulse sequence with high image quality and reduced acoustic noise.