METHOD FOR THE DETERMINATION OF THE NUCLEAR MAGNETIZATION DISTRIBUTION IN A LAYER OF A REGION UNDER INVESTIGATION,AND NUCLEAR SPIN TOMOGRAPH FOR CARRYING OUT THE METHOD

摘要

The invention relates to a sequence with a very short echo time. However, during the measurement, there is a constant gradient, the direction of which is varied from sequence to sequence, while its magnitude remains constant. The shortening of the echo time is achieved in that in the first instance on both sides of the layer to be excited, two comparatively thick regions are excited. The nuclear magnetization excited in these regions is dephased, and subsequently a likewise comparatively thick region is excited by a further high-frequency pulse, which encompasses the layer to be excited as well as a part of the regions on both sides of the layer.