Fig. 1
Acquisition scheme of the 3D ECG-triggered UTE sequence used to reconstruct either 10 High Spatial Resolution cine images or 40 High Temporal Resolution cine images. a Blocks of 4 Free Induction Decays (FIDs) corresponding to 4 k-space trajectories (named « 1-2-3-4 » for the first R-R interval, « 5-6-7-8 » for the second R-R interval…) were repeatedly acquired 10 times along one R-R interval. b (up) Point surface showing the end-point of the acquired half-projections in a 3D k-space and (bottom) the corresponding projections on the kx-ky plane, acquired 10 times for one R-R interval. The reconstructed images display high space resolution (HSR) and lower time resolution. c (up) Point surface showing the ends of the first acquired half-projection of each block in a 3D k-space and (bottom) the corresponding projections on the kx-ky plane of the end-point of trajectories. The reconstructed images display higher time resolution (HR) at the expense of space-resolution. d Projections on the kx-ky plane of the end-point of the second trajectories of each block used for HTR2, 6,… images in red, the third trajectories of each block used for HTR3, 7, … images in green and the fourth trajectories of each block used for HTR4, 8, … images in magenta