| 摘要 |
PCT No. PCT/EP90/01681 Sec. 371 Date Jun. 1, 1992 Sec. 102(e) Date Jun. 1, 1992 PCT Filed Oct. 6, 1990 PCT Pub. No. WO91/09322 PCT Pub. Date Jun. 27, 1991.A method for generating a spectrum of NMR signals with rectangular characteristic in the frequency space by radiating a sequence of RF pulses onto a sample in the homogeneous magnetic field is presented. The RF pulses of the sequence are amplitude modulated and the enveloping function of the sequence consists of a superposition of bell-curve-shaped RF pulses with optimized positions of the maxima, pulse widths and peak amplitudes. The response signals, in dependence on the standardized frequency, shift, approximate virtually ideally, a rectangular function. The method is applicable with success especially in image generation for NMR tomography, in multidimensional NMR spectroscopy, as well as in volume selective NMR spectroscopy.
|
