Method and device for determining an NMR distribution in a region of a body

摘要

The method and device for NMR Fourier zeugmatography utilizes amplitude-modulated r.f. pulses (90 DEG and 180 DEG pulses) for the excitation of nuclear spins and the generating of nuclear spin echo signals. For three-dimensional Fourier zeugmatography, r.f. pulse having a large bandwidth (for example 10-50 kHz) are desired. The use of amplitude-modulated signals then implies an undesirably high peak power of the r.f. generator. In accordance with the invention, use is made of a frequency-modulated signal which can have a substantially constant amplitude and which preferably covers the desired frequency spectrum at a uniform speed.