Abstract #1690

Sharing GRAPPA calibration regions to accelerate quantitative imaging with phase-cycled bSSFP

Berk Can Acikgoz^1,2,3, Yves Moerlen^1,2, Nils M.J. Plähn^1,2,3, Eva S. Peper^1,2, Piotr Radojewski^2,4, and Jessica A.M. Bastiaansen^1,2

¹Department of Diagnostic, Interventional and Pediatric Radiology (DIPR), Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland, ²Translational Imaging Center (TIC), Swiss Institute for Translational and Entrepreneurial Medicine, Bern, Switzerland, ³Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland, ⁴Institute Diagnostic and Interventional Neuroradiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland

Synopsis

Keywords: Parallel Imaging, Parallel Imaging, GRAPPA, phase-cycled bSSFP

Motivation: Quantitative imaging typically relies on repeated acquisitions of data with similar contrast. When combined with GRAPPA undersampling, repeatedly acquiring calibration regions may be redundant and prolong scan time.

Goal(s): To demonstrate that a single acquisition of a calibration region is sufficient for multiparametric mapping.

Approach: Undersampled phase-cycled bSSFP data were acquired and reconstructed using GRAPPA, using a single calibration region which was shared across contrasts and a repeated calibration region. Results were compared with fully sampled brain data obtained in healthy volunteers.

Results: The acquisition of a single calibration region reduced scan time by ~30%, while T1 and T2 quantification was not affected.

Impact: Shared calibration region data across repeated acquisitions in quantitative parametric mapping sequences, significantly accelerates quantitative imaging without compromising image quality.

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.