Fig. 6.
The Z-spectrum (blue line), MTRasym of water (red line in the 1st row) or LAasym of fat (red line in the 2nd to 4th row) as a function of irradiation offset from the in vivo lumbar vertebrae of a volunteer with ΔB0 = −100 Hz (1st column), 0 Hz (2nd column) and 100 Hz (3rd column). The LAasym from three groups of fat peaks are displayed separately. The first group (P1) contains one fat peak that is located at 0.60 ppm. The second and third groups contain two peaks which are difficult to be separated (P3 and P4 corresponding to the peaks located at −1.94 and −2.60 ppm; P5 and P6 corresponding to the peaks located at −3.40 and −3.80 ppm). The total Z-spectrum are built by adding the absolute values of the Z-spectra. MTRasym of the total Z-spectrum show that the CEST contrasts are concomitated by LAasym