th  - 1988 - 51st ENC Conference

WED ii:00 J
HUMAN IN VIVO SPECTROSCOPY AT 4.0T
Dietmar Hentschel, Jurgen Vetter, Ralf Ladebeck, and Michael J. Albright*
Siemens AG, D-8520 Erlangen, FDG
A 4 T six-coil SCM with a warm bore of 1.25 m diameter was designed
with high homogeneity for use with in vivo spectroscopy. Computer optimized
design was used to correct terms up to 10th order. The magnet can be ramped
to 4 T in 1 hour. The rated current is 376 A, and the stored field energy is 39
MJ. The field drift is less than 3.6 x 10-e/h, and bare homogeneity of 100 ppm
can be corrected to less than +2.5 ppm for a 50 cm dsv. The total magnet
weight is 10.6 tons.
Increased spectral dispersion will be shown by comparison with 2 T
spectra. Human in vivo 31p spectra at 4 T show resolution of the different
PDE resonances, and, on some spectra, separation of the dinucleotides and
nucleoside diphosphosugars upfield of the (z-ATP peak.
High field RF penetration will be demonstrated with a 1H image at 4 T.
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