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Ultrashort-TE (UTE) pulse sequence diagrams: two-dimensional (2D) UTE sequence with a slice-selective half-pulse excitation, followed by 2D radial ramp sampling (A), and three-dimensional (3D) UTE with a short rectangular hard pulse excitation, followed by 3D radial ramp sampling (B). DAW, data acquisition window; FID, free induction decay; NEX, number of excitations; RF, radiofrequency.
