MRI spatial encoding via RF phase-gradient fields

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I will introduce a new method for performing magnetic resonance imaging (MRI) known as TRansmit Array Spatial Endcoing (TRASE).  TRASE MRI utilizes radio-frequency (RF) phase-gradient fields, rather than standard B0 magnitude gradients, to manage spatial encoding. TRASE may be able to eliminate some of the disadvantages of conventional MRI – such as equipment expense, power consumption, mechanical vibration and acoustic noise – possibly resulting in a cheaper, quieter MRI system.

 

The traversal of k-space with TRASE is achieved not by varying the intensity or duration of a given phase-gradient pulse but through a rapid succession of 180-degree pulses generated by alternate phase-gradient coils.  As a result, RF handling and control can be more demanding with TRASE.  The generation of the phase-gradient fields themselves (i.e., uniform magnitude with linearly varying direction) also requires a rethink of coil design.

 

We’ve been using a low-field MR system with hyperpolarized nuclei (He-3) as a test bed for exploring the fundamental physics and hardware requirements of TRASE.  Some recent results and a few new insights will be presented.  TRASE is at a very early stage in its development – especially if one compares it to the decades of R&D for conventional MRI – and it would certainly benefit from increased interest and involvement from the broader NMR/MRI community.  

UPMC salle 22-23-401

Mardi 13 Juin 2017 12:30
Dr. BIDINOSTI Christopher Bidinosti
University of Winnipeg
Séminaire du département
Unité de rattachement: 
UMR 7203
Equipe de rattachement 7203: 
Equipe 3