Meeting Banner
Abstract #4176

ZTE in highly inhomogeneous B0 regime.

Jose Borreguero1,2, Fernando Galve2, Jose Miguel Algarín2, and Joseba Alonso 2
1Tesoro Imaging SL, Valencia, Spain, 2Institute for Molecular Imaging and Instrumentation (i3M), Spanish National Research Council (CSIC) and Universitat Politècnica de València (UPV), Valencia, Spain

Synopsis

Keywords: Image Reconstruction, Image Reconstruction, Short T2 sequences, Inhomogeneous B0

Motivation: : ZTE has proven to be a powerful MRI sequence for ultrashort T2 tissues, but it fails to produce useful images in the presence of strong field inhomogeneities.

Goal(s): To develop a method to correct artifacts induced by strong B0 inhomogeneities in ZTE sequences, based on on-the-fly B0 maps.

Approach: A B0 map, obtained by phase difference between two fast SPRITE sequences, is fed into an encoding matrix for posterior image reconstruction by Kaczmarz’s Algebraic Reconstruction Techniques.

Results: Geometric distortions and hyperintense regions resulting from B0 strong quadratic components are largely reverted with this approach.

Impact: This method can be exploited for e.g. dental imaging with ZTE in affordable low-field MRI systems, and can be generalized to other non-Cartesian sequences. Furthermore, it may prove useful for imaging with extreme magnet geometries as in e.g. single-sided MRI.

How to access this content:

For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.

After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.

After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.

Click here for more information on becoming a member.

Keywords