发明名称 |
MRI using variable imaging parameter(s) within a single image sequence |
摘要 |
At least one imaging parameter (e.g., the repetition interval TR or the initial nutation angle theta ) is varied during the course of a single MR image sequence. This variation in at least one imaging parameter is preferably controlled so as to increase the contrast and signal-to-noise ratio of lower spatial frequency image components. For example, by using longer TR intervals (or smaller initial nutation angle theta ) during lower spatial frequency phase encoding sub-sequences, relatively more signal is gathered from NMR nuclei having long T1 parameters thus providing a resultant image with many characteristics of a much longer overall sequence (e.g., one using uniform relatively long TR intervals for all spatial frequency phase encoding sub-sequences).
|
申请公布号 |
US5239266(A) |
申请公布日期 |
1993.08.24 |
申请号 |
US19920986570 |
申请日期 |
1992.12.07 |
申请人 |
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA |
发明人 |
KAUFMAN, LEON;KRAMER, DAVID M.;COLEMAN, JOHN M. |
分类号 |
G01R33/54;G01R33/56;G01R33/561 |
主分类号 |
G01R33/54 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|