Article Figures & Data
Figures
- Fig 1.
Schematic representation of the PRESS sequence used to acquire spectral data. The unshaded gradients pulsed are applied in the x, y, and z axes for voxel selection. The shaded gradient pulses are dephase-rephase gradients, which remove the spurious signal intensity generated by RF inhomogeneities. The 90° and 180° RF pulses are indicated. The time window for data sampling is also indicated.
- Fig 2.
T2-weighted axial image demonstrating voxel placement in the region of the left basal ganglia.
- Fig 3.
Global phase difference for PRESS (solid line) as a function of gating delay from the R wave. Note that the global phase change of the water signal intensity is minimal throughout the cardiac cycle. The STEAM (dashed line) data are from previously published work.9
- Fig 4.
PRESS spectra obtained from one subject, illustrating the spectral quality of gated (A) and nongated (B) acquisitions. This figure demonstrates that there is no difference in spectral quality between the 2 methods.
Tables
Peak area measurements for individual metabolites, from gated and nongated point-resolved spectroscopy acquisitions
Metabolite Peak Area (au) P-value Gated Nongated NAA 1225.9 ± 121.5 1152.8 ± 85.5 .137 Cr 967.3 ± 107.0 1007.5 ± 89.6 .375 Cho 754.0 ± 60.8 752.0 ± 107.1 .959 Note:—NAA indicates N-acetylaspartate; Cr, total creatine; Cho, choline-containing compounds. For comparisons between gated and nongated acquisitions, P > .05 is nonsignificant. Arbitrary units, as defined in Methods.
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