Meeting Banner
Abstract #4419

Slice-selective universal pulses for brain imaging at 7 Tesla using a birdcage coil

Bastien Guerin1,2, John Drago1,2,3, Juergen Herrler4, Lawrence Wald1,2, and Jason Stockmann1,2
1Massachusetts General Hospital, Charlestown, MA, United States, 2Harvard Medical School, Boston, MA, United States, 3EECS, Massachusetts Institute of Technology, Cambridge, MA, United States, 4Siemens Healthineers, Erlangen, Germany

Synopsis

Keywords: RF Pulse Design & Fields, RF Pulse Design & Fields

Motivation: Most 7T brain MRI sequences require slice-select pulses with good slice profiles and correction of flip-angle (FA) inhomogeneities, which is difficult to achieve.

Goal(s): We design fully optimized (FO) pulses capable of creating uniform in-slice FA excitations and box-like slice profiles using a birdcage coil alone (no pTx).

Approach: We optimize the Caley-Klein parameter beta which allows control of the FA and phase inside and outside the slice.

Results: FO pulses achieve ~10% FA NRMSE in-slice while creating box-like slice profile with little phase variation inside the slice and little excitation outside the slice.

Impact: Slice-selective fully optimized pulses solve the FA brain homogenization problem at 7T using a birdcage coil alone (no pTx) and yield box-slice slice profiles with little phase variation inside the slice and little excitation outside.

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