Some contrast mechanisms like in- and out-of-phase contrasts of fat and water come into play at sub-millisecond echo times(TE) at high field strengths above 3T, and under-recognition of them can lead to misunderstanding of signal intensities and inappropriate interpretation of normal and disease pathology. Here the TEs including the sub-millisecond ones were estimated at various field strengths and it was demonstrated by phantom and human lung imaging that contrast mechanisms are apparently seen at the sub-millisecond TE and thus should not be overlooked at high field strengths when using UTE imaging techniques that can cover the range of sub-millisecond TE.
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