Localized phosphorus NMR spectroscopy: a comparison of the FID, DRESS, CRISIS/CODEX, and STEAM methods in vitro and in vivo using a surface-coil.
The FID, DRESS, CRISIS/CODEX, and STEAM techniques for localized 31P NMR spectroscopy were compared using a Siemens Magnetom SP63 1.5 T whole-body imager and a surface-coil, 80 mm in diameter, acting as transmitter and receiver coil. The comparison was performed with phantom experiments and human in vivo investigations on the calf muscle. The phantom experiments which used the same volume size showed a comparable signal-to-noise ratio for FID and DRESS, while the two fully localized techniques showed a reduction in signal-to-noise ratio to 76% for CRISIS/CODEX and 31% for STEAM. The in vivo measurements confirm the phantom results and reveal that CRISIS/CODEX gains a 2.5 fold higher signal-to-noise ratio than STEAM under the same conditions.
Jung
W I
WI
Max Grundig Klinik, Bühl, Germany.
Küper
K
K
Schick
F
F
Bunse
M
M
Pfeffer
M
M
Pfeffer
K
K
Dietze
G
G
Lutz
O
O
D006801:Humans; D066298:In Vitro Techniques; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation / Q000379:methods*; D008961:Models, Structural