The multi-echo SWV with the proposed complex signal
modeling method can provide high-SNR and multi-contrast phase masks and SWV
images. The multiplication number of the phase mask for SWV was increased up to
16 without image degradation even at the long TE of 49.8 ms. More detailed vein
structures were visualized with higher- and multiple contrasts than the
conventional single-echo GRE SWV.
