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Abstract #1333

The impact of shimming on fat suppression in head-and-neck MRI: current practice vs an image based approach

Tim Schakel1, Jeroen C.W. Siero2, Hans Hoogduin2, and Marielle Philippens1

1Radiotherapy, UMC Utrecht, Utrecht, Netherlands, 2Radiology, UMC Utrecht, Utrecht, Netherlands

In the head-and-neck region, off resonance effects due to magnetic field inhomogeneities can lead to poor fat suppression. In this study we compare the current clinical practice of shimming (volume shim) with the gain of an image based approach. B0 field maps are analyzed using water/fat segmented Dixon images to estimate the fat suppression. Diffusion weighted images are used to verify the estimates for fat suppression. An image based shimming optimization was performed to simulate 1st and 2nd order shim field. Image based shimming is a promising technique to improve subject specific shimming and fat suppression in the head-and-neck region.

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