| 摘要 |
The invention relates to a method of mapping the local distribution of B1-dispersion of relaxation tim T1 rho of the nucleus of a certain element, such as hydrogen or phosphorus of an object, such as e.g. a human body or a part of it, or the trunk of a tree. In the method of this invention, an object area is first subjected to a first excitation pulse, which tilts the magnetization of the nuclei of said object area preferably 90 DEG and thereafter to a locking pulse, whose phase and frequency are selected in a manner that relaxation with respect to the magnetic vector of this locking pulse takes place, followed by performing the required procedures by applying per se known nuclear spin imaging methods, and the above sequence of operations is repeated as many times as desired by changing the amplitude of said locking pulse. |
