Meeting Banner
Abstract #4622

In-vivo correction of B0-induced distortions in a portable Halbach scanner

Jose Borreguero1, Fernando Galve1, Jose Miguel Algarín1, Eduardo Pallás1, Rubén Bosch2, Jesús Conejero2, Marina Fernández2, Pablo García-Cristobal2, Teresa Guallart-Naval2, Lucas Swistunow2, and Joseba Alonso2
1MRI-lab, Institute for Instrumentation in Molecular Imaging (Spanish National Research Councial (CSIC) & Universitat Politècnica de València (UPV)), Valencia, Spain, 2Institute for Instrumentation in Molecular Imaging (Spanish National Research Councial (CSIC) & Universitat Politècnica de València (UPV)), Valencia, Spain

Synopsis

Keywords: Image Reconstruction, Image Reconstruction

Motivation: Permanent, Halbach-based magnets are suitable for lightweight and affordable scanners for brain and musculoskeletal imaging. Unfortunately, they tend to suffer from poor B0 homogeneity, creating distortions that compromise standard reconstructions.

Goal(s): We aim to evaluate the performance of a new approach for distortion correction in-vivo in a 90 mT Halbach system.

Approach: We employ a single-point double-shot (SPDS) sequence prior to the acquisition to map the magnetic field in an undistorted image space. This information is included in an Encoding Matrix and images result from applying algebraic reconstruction techniques (ART).

Results: Model-based reconstructions after SPDS surpass the quality of standard reconstruction methods.

Impact: The value of brain and musculoskeletal images obtained in low-cost scanners can be significantly enhanced with respect to standard methods when the main magnetic field deviates substantially from an ideal, homogeneous distribution.

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