Variable Bandwidth Turbo Spin-Echo Dixon Imaging

The echo shifts commonly applied in turbo spin-echo Dixon imaging for chemical shift encoding affect the signal-to-noise ratio in the resulting in-phase and water images not only directly through the noise propagation in the water-fat separation, but also indirectly through the turbo spin-echo sequence. In this work, an optimization of the signal-to-noise ratio is proposed under the constraint of a fixed spacing between successive refocusing pulses. On the example of dual-echo Dixon imaging, it is shown to lead to shorter optimal echo shifts and to suggest a variable readout gradient strength, bandwidth and sampling window length per echo shift, which permits enhancing the signal-to-noise ratio.

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