Volume-selective multi-pulse spin-echo spectroscopy and selective suppression of spectral lines.

A method is described allowing the recording of in vivo NMR spectra in sharply bound volume elements preselected on the basis of slice images. Experiments with phantom samples, as well as with a test person in a whole-body instrument, have been carried out to demonstrate the applicability of the technique. In the case of proton spectroscopy, suppression of the water and/or or of the lipid line is often desirable.

Analysis of multiple T2 proton relaxation processes in human head and imaging on the basis of selective and assigned T2 values.

Two-dimensional T2-selective proton imaging of human head has been performed at 10 MHz employing Carr-Purcell-Gill-Meiboom pulse trains with echo separation of 6 and 12 msec. Using the information of 36 spin echoes and applying a recovery time of 2 sec the magnetization decay has been traced. The multi-exponential T2 relaxation curve of each pixel of the image has been deconvoluted into up to three mono-exponential functions which are defined by 1/T2,i and alpha i.

[Thin-layer NMR-imaging with a new T2-weighted 3-D-procedure].

Presentation of first experience with a new 3-dimensional data acquisition method. The new method yields sets of 120 continuous images of the head and brain in all 3 dimensions (slice thickness and spatial resolution both being 1.7 mm.