Fat/water separation in a single MRI image with arbitrary phase shift

M. Dylan Tisdall; M. Stella Atkins

doi:10.1117/12.655128

2 March 2006 Fat/water separation in a single MRI image with arbitrary phase shift

M. Dylan Tisdall, M. Stella Atkins

Proceedings Volume 6142, Medical Imaging 2006: Physics of Medical Imaging; 61423X (2006) https://doi.org/10.1117/12.655128
Event: Medical Imaging, 2006, San Diego, California, United States

Abstract

Signal from fat is normally removed from MR images either by fat separation techniques that distinguish water from fat signal after the data has been received, or by fat suppression techniques that prevent the fat signal from being received. Most approaches to fat separation are variations on Dixon imaging. The primary downside to Dixon imaging is the requirement for multiple images with stationary anatomy, often with specific TEs. An alternate approach is to take only one image, estimate phase errors to correct for inhomogeneity or other effects, and then separate the water and fat using the known phase shift. This has shown promise in previously published work, but the water and fat signals were always perpendicular, requiring a fixed TE. We consider the possibility of separation from a single, phase-corrected image with an arbitrary angle between water and fat signals. We note that a change of basis will separate water and fat signals into two images with additive zero-mean Gaussian noise. However, as the angle between water and fat nears pi or 0, the noise power in the separated images increases rapidly. We discuss techniques for reducing this noise magnification.

Citation Download Citation

M. Dylan Tisdall and M. Stella Atkins "Fat/water separation in a single MRI image with arbitrary phase shift", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61423X (2 March 2006); https://doi.org/10.1117/12.655128

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KEYWORDS

Signal to noise ratio

Commercial off the shelf technology

Magnetic resonance imaging

Phase shifts

Error analysis

Image restoration

Interference (communication)

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