Abstract #2675

Detailing and Enhancing Respiratory Motion Induced Myocardial B0 Field Dispersion at 7.0 T: Implications for Cardiac Imaging and Spectroscopy at Ultrahigh Magnetic Field Strengths

Till Huelnhagen¹, Ariane Fillmer², Antje Els¹, Florian Schubert², Bernd Ittermann², and Thoralf Niendorf^1,3,4

¹Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association(MDC), Berlin, Germany, ²Physikalisch Technische Bundesanstalt (PTB), Berlin, Germany, ³Experimental and Clinical Research Center, a joint cooperation between the, Charité Medical Faculty and the Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany, ⁴DZHK (German Centre for Cardiovascular Research), partner site Berlin, Berlin, Germany

Respiratory motion induced B₀ field fluctuations, constitute a challenge for B₀ sensitive CMR like spectroscopy. Accommodating CMRS in a single breath-hold is elusive if not prohibitive. Motion corrected approaches under free breathing were demonstrated to substantially improve CMRS. Yet, B₀ field fluctuations over the respiratory cycle may compromise spectral resolution and data integrity. A compensation strategy like dynamically updated first order shims synchronized with the respiratory motion, offers the potential to enhance spectral quality and permits scan time shortening. This work details respiratory motion induced B₀ fluctuations in the interventricular septum and examines the capability of linear shimming for compensation of myocardial B₀ fluctuations.

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