Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | |||
| library:time_to_repeat [2025/06/21 18:45] – [TR and Specific Absorption Rate] scott | library:time_to_repeat [2026/05/26 17:07] (current) – [TR in Fast Spin Echo] scott | ||
|---|---|---|---|
| Line 20: | Line 20: | ||
| ===Driven Equilibrium/ | ===Driven Equilibrium/ | ||
| | | ||
| - | This technique is common in spine imaging, and is an option available on almost all scanner generations. At the end of the echo train, an additional -90 degree RF pulse is tacked on to force any remaining magnetization back toward equilibrium. This in effect replaces the the waiting period (the 3000+ TR) needed for T1 recovery, allowing much shorter TR's to be used with heavily T2 weighted images. With typical parameters, fluids will also be brighter than they normally would with comparable TE's. | + | This technique is common in spine imaging, and is an option available on almost all scanner generations. At the end of the echo train, an additional -90 degree RF pulse is tacked on to force any remaining magnetization back toward equilibrium. This in effect replaces the the waiting period (the 3000+ TR) needed for T1 recovery, allowing much shorter TR's to be used with heavily T2 weighted images. With typical parameters, fluids will also be brighter than they normally would with comparable |
| ====TR in Fast Gradient Echo==== | ====TR in Fast Gradient Echo==== | ||