| 摘要 |
<p>A multi-echo magnetic resonance imaging sequence is implemented such that a radio frequency receiver (34) receives magnetic resonance echoes. The resonance data received during each echo are digitized and the resultant echo data are stored in a corresponding echo memory (40,42). The locations of the data within the memories are brought into registration by centering means (52) such that corresponding data in each memory (40,42) is disposed at the same memory address. Because data from later echoes tends to be weaker or at a lower magnitude, the magnitude of the data stored in each memory (40,42) is normalized by normalizing means (60). The phase of the data in each memory (40,42) is brought into coordination by a zero order phase correction means (70). A high pass filter (84) and a complementary low pass filter (86) separate complementary portions of the data from the memories (40,42). The separated portions are combined into a single synthesized data set for storage in a memory (82). The synthesized data are Fourier transformed by two dimensional Fourier transform means (100) to produce a synthetic image which has selected characteristics of an early echo image, e.g. high resolution, and selected characteristics of a late echo image, e.g. good T2 contrast. In this manner, the synthetic image has properties or characteristics which render it more diagnostically valuable than either an early or a late echo image.</p> |
