Inherent insensitivity to RF inhomogeneity in FLASH imaging

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Danli WangXiaoping Hu

Abstract

Radiofrequency (RF) field inhomogeneity is an unavoidable problem in MRI, and it becomes severe at high magnetic fields due to the dependence of B1 on the sample. It leads to nonuniformities in image intensity and contrast, causing difficulties in quantitative interpretation and image segmentation. In this work, it is observed that with the fast low-angle shot (FLASH) sequence, which is often used for anatomic imaging and morphometric studies, sensitivity to RF inhomogeneity can be substantially reduced when the same coil is used for both transmission and reception, and an appropriate nominal flip angle is employed. This observation can help us understand the signal behavior of FLASH in the presence of RF inhomogeneity, and provide a guide for selecting parameters in FLASH imaging.

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Citations

Jul 11, 2007·Topics in Magnetic Resonance Imaging : TMRI·Mark E Ladd
Aug 28, 2009·International Journal of Biomedical Imaging·Ping-Feng ChenHamid Krim
May 18, 2005·NeuroRx : the Journal of the American Society for Experimental NeuroTherapeutics·Roland BammerGary H Glover
Sep 26, 2007·Magnetic Resonance Imaging Clinics of North America·Lindsay Turnbull, Susanne Booth
Jan 17, 2012·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Mustapha Bouhrara, Jean-Marie Bonny
Jun 24, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Antoine LuttiNikolaus Weiskopf
Sep 8, 2006·Journal of Magnetic Resonance Imaging : JMRI·Matt A BernsteinHeidi A Ward
Feb 29, 2008·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Gunther HelmsPeter Dechent
May 25, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Paula Ramos DelgadoThoralf Niendorf

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