A method for the improvement of the vessel - fabric - contrast in the time - of - flight angiography a magnetic resonance tomography - measurement -

摘要

A method for the improvement of the vessel - fabric - contrast in the time - of - flight angiography a magnetic resonance tomography - - measuring comprising the steps of:– Generating a sequence of high frequency - excitation pulses are each of which have a flip angle and their respective time interval in the sequence is determined by means of a repetition time,– Generation of slice-selective by means of gradient coils in such a way that with the use of an analog - digital converter (adc) the magnetic resonance - answer signals in a as k - matrix layer in the frequency - or k - space to be scanned,– Scanning of the k - matrix in such a way that the spacing of the respective measurement point to the center of the k - matrix is continuously increased or reduced, and– Change of the repetition time during the scanning, wherein the change in the repetition time during the scanning operation on a functional relationship between distance and repetition time is based and / or– Change of the flip angle during the scanning, wherein the change of the flip angle during the scanning operation on a functional relationship between distance and flip angle is based.