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Pairing a fast excitation pulse with UTE (A: 24.47 μT RF, 34 µs TE) and a slow excitation pulse with a later echo (B: 1.53 μT RF, 2 ms TE) sensitizes the magnitude difference image to short-T2 signals. Normalizing the difference removes proton density weighting and allows clear depiction of the skull in MR head imaging. Contrast in the normalized difference MR-sim.-CT images resembles that of x-ray CT images (e) acquired from the same subject.
