t1 and a rather low protein content it can be appreciated that in this case it is not possible to achieve a situation in which for example the fat and muscular tissue would issue a zero signal but blood a signal different from zero in fig6 a tissue contrast provided by the sequence shown in fig3 is illustrated in more detail by using the above mentioned exemplary tissues the off resonance radiation effected prior to an inversion pulse has no effect on the magnetization of hydrogen nuclei contained in fat molecules and a very little effect on the magnetization of water molecules contained in blood on the other hand the magnetization of abundantly proteinaceous muscular tissue is distinctively shortened if the parameters amplitude duration and frequency of radiation associated with off resonance radiation are properly selected the result will be a situation as shown in the figure signals corresponding to fat and muscular tissues disappear when value t 0 is selected for inversion time ti in fig7 a tissue contrast provided by the sequence shown in fig4 is illustrated in more detail by using the above mentioned exemplary tissues prior to an inversion pulse the magnetizations are now in the state.