Meeting Banner
Abstract #4422

Gradient swept adiabatic pulses for out of slice inversion and outer volume suppression.

Ronald Ouwerkerk1, Nader S. Metwalli1, and Ahmed M Gharib1
1Biomedical and Metabolic Imaging Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, United States

Synopsis

Keywords: RF Pulse Design & Fields, RF Pulse Design & Fields, adiabatic, outer-volume supression, black blood

Motivation: Slice selective adiabatic pre-pulses have many uses in magnetic resonance. Using gradient waveforms to create adiabatic rotations creates new ways to prepare magnetization.

Goal(s): Explore adiabatic pulse with frequency sweeps created by gradient wave forms instead of RF frequency waveforms.

Approach: Gradient swept adiabatic inversion pulses were tested with numerical Bloch simulations and on a phantom in a 3T scanner.

Results: The pulses can invert magnetization outside a well-defined non-perturbed slice. Sub-adiabatic use allows outer volume suppression, and the non-perturbed slice can be transformed into a wedge with additional constant orthogonal gradients.

Impact: A new class of adiabatic inversion pulses with frequency sweeps generated by gradient waveforms to yield inversion outside a well-defined non-perturbed slice or wedge delivers new options for pre-pulses for contrasts, spatial selection, or outer volume suppression.

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