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FIG 2. Phantom profile for water signal intensity with the 180° Hamming-weighted sinc pulse of the PRESS CSI sequence (solid line with black boxes) obtained by selecting the right-left dimension of the 100-mm VOI (vertical lines). Profile shifted by 10 mm (dashed line with white boxes). This displacement approximately corresponds to the chemical-shift difference between water and NAA with the typical excitation bandwidth of 1500 Hz for the section-selective 180° pulse. Images shows the difference between the original profile and the shifted profile spanning the VOI (dotted line with gray circles). The water intensity on the y axis is expressed in institutional units (i.u.), and the x axis corresponds to the 10-mm voxels in the 160-mm FOV.
