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Abstract #4830

SAR-Constrained kT-Points Pulse Design Applied to B1 Inhomogeneity Mitigation in the Human Abdomen at 3T

Raphaël Tomi-Tricot1, Vincent Gras1, Franck Mauconduit2, Nicolas Boulant1, Pierre Zerbib3, Alain Rahmouni3, Alexandre Vignaud1, Alain Luciani3, and Alexis Amadon1

1CEA-DRF-I2BM-NeuroSpin-UNIRS, Gif-sur-Yvette, France, 2Siemens Healthineers France, Saint-Denis, France, 3Department of Radiology, AP-HP, CHU Henri Mondor, Créteil, France

High field MRI systems offer better performance in terms of signal-to-noise ratio but are burdened with dielectric resonance artefacts inducing zones of weak excitation with major consequences on Signal and Contrast to Noise Ratios. In this work, the interest of subject-tailored kT-points pulse design with joint SAR control over current patient-specific RF-shimming technique is investigated, in the context of human liver imaging at 3T. T1w acquisitions are performed in-vivo to compare quadrature, tailored RF-shimming, and kT-points pulses. The interest of kT-points is clearly demonstrated in terms of signal, contrast and diagnostic power.

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