| 摘要 |
MR lymphography depicts lymph liquid that flows through lymphatic vessels and lymph nodes, such liquids can easily be depicted with no contrast agent. An effective echo time (TEeff) of a pulse sequence is selected to depict the desired lymph liquid. The effective echo time is determined to be relatively long as compared to the T1 relaxation time of blood. For example, an effective echo time may be in the range of 120 to 800 msec when a pulse sequence is based on the FAST method. In this case, it is preferred that an echo train spacing (ETS) is relatively short, for example, ETS=3 to 10 msec. The pulse sequence is performed and an MR signal generated in response to the pulse sequence is acquired. From the MR signal, an image is produced wherein the lymph is highlighted while vessels providing a background are also depicted, although the contrast of the background vessel is kept lower than that of the highlighted lymph liquid.
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