Localized NMR Spectroscopy with a 1.5 T Whole Body Imager
Volume selective NMR spectroscopy demands a high standard of methodical and experimental prerequisites. We are working with CODEX (1) and an optimized version (2) of the 90° – 180° – 108° double spin echo method (3) as localization sequence which are implemented on a 1.5 T Magnetom whole body imager. The properties of the methods will be discussed shortly. CODEX has a very small T2 sensitive time whereas the double spin echo has variable echo times, so both methods are complimentary and can be appropriatly used. The time stability of the imager and the spectral resolution have been tested with 1H — CODEX using the CH2 — multiplet of ethanol (95%). An observed spectral resolution of better than 2.10-8 and only small drifts fulfill the condition for high resolution localized 1H spectroscopy with small volume element of the size of (13 mm)3.