One version of a new ultrafast gradient-echo-based 3D imaging technique using spatiotemporal encoding (RASE-I) is proposed which can provide very short TEs in some slices. RASE-I maintains most of appealing features of other spin-echo-based SPEN imaging methods including no Nyquist ghosting and high tolerance to field inhomogeneities. It is barely affected by T2* signal modulation and less sensitive to T2* effects due to local rephasing mechanism along the SPEN direction. Its performance is demonstrated by lemon and in-vivo mouse kidney imaging at 9.4T, including the measurement of dose-dependent arterial-input-function (AIF) of kidney-feeding artery.
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