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. Author manuscript; available in PMC: 2017 Oct 1.
Published in final edited form as: NMR Biomed. 2016 Aug 5;29(10):1373–1380. doi: 10.1002/nbm.3579

Figure 1.

Figure 1

The 3D UTE and IR-UTE sequences (A), and radial trajectories with conical view ordering in k-space (B), as well as the contrast mechanisms for UTE imaging of total water (B) and IR-UTE imaging of bound water (D). The 3D UTE sequence employs a short rectangular pulse for signal excitation followed by 3D radial ramp sampling with a minimal nominal TE of 32 µs, allowing detection of both bound and pore water (C). The 3D IR-UTE sequence employs an adiabatic inversion pulse to invert and null the pore water magnetization. The bound water magnetization is not inverted and is detected by a subsequent UTE data acquisition (D).