METHOD AND DEVICE FOR DETERMINING AN NMR DISTRIBUTION IN A REGION OF A BODY

摘要

Method and device for determining an NMR distribution in a region of a body. The method and device for NMR Fourier zeugmatography utilizes amplitude-modulated r.f. pulses (90.degree. and 180.degree. 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.