Abstract
Large and spatially-linear phase errors along the frequency-encode direction may be induced by several common and hard-to-avoid system imperfections such as eddy currents. For data acquired in dual-echo Dixon techniques, the linear phase error can be more aggravated when compared to that acquired in a single echo and can pose challenges to a phase-correction algorithm necessary for successful Dixon processing. In this work, we propose a two-step process that first corrects the linear component of the phase errors with a modified Ahn-Cho algorithm (Ahn CB and Cho ZH, IEEE Trans. Med. Imaging 6:32, 1987) and then corrects the residual phase errors with a previously-developed region-growing algorithm (Ma J, Magn. Res. Med. 52:415, 2004). We demonstrate that successive application of the two-step process to data from a dual-echo Dixon technique provides a "-2 punch" to the overall phase errors and can overcome local water and fat separation failures that are observed when the region-growing-based algorithm is applied alone.
Original language | English (US) |
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Pages (from-to) | 1250-1255 |
Number of pages | 6 |
Journal | Magnetic resonance in medicine |
Volume | 60 |
Issue number | 5 |
DOIs | |
State | Published - Nov 2008 |
Keywords
- Dixon water/fat separation
- Dual-echo acquisition
- Linear phase errors
- Phase correction
- Region growing
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging