The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)

Fig. 5. —Graph shows effect of steady-state-free-precession (SSFP) angle in one TR on signal of fast imaging with steady-state free precession at 70° flip angle plotted for (from top to bottom) cerebral spinal fluid, nonmyelinated white matter, adult gray matter, and adult white matter. Note that if 180° phase alternation is used for radiofrequency excitation, signal is relatively uniform for all brain tissues with about ± 90° tolerance in SSFP angle. With automatic shimming, a line width of 64 Hz at 1.5 T, measured at one tenth of maximum, was routinely achievable. Banding-free images can thus be obtained at TR of 8.0 msec or less. Also note significant signal difference between nonmyelinated and myelinated white matter because of changes in T1/T2, which provides poor contrast between adult gray and white matter.