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Missing pulse steady-state free precession

✍ Scribed by S. Patz; S. T. S. Wong; M. S. Roos

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
788 KB
Volume
10
Category
Article
ISSN
0740-3194

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✦ Synopsis

A fast imaging technique, missing pulse steady-state free precession (MP-SSFF'), is described. MP-SSFP is one of a class of steady-state free precession techniques in which every nth RF pulse is missing. MP-SSFF' has been implemented for the case where every third R F pulse is omitted:

). A RF-refocused echo forms at the time of the missing pulse. This echo is less sensitive to field inhomogeneities than the gradient-recalled echoes used in most fast imaging methods. An analytical expression is obtained for the signal strength as a function of the flip angles 0 , and B2, the interpulse interval T , and the amount of interpulse dephase. The expression shows that 8, and 82 provide two degrees of freedom to optimize the signal-to-noise ratio and improve tissue contrast. Two different cases, 8, = and 19, = -02, are described to demonstrate the difference in contrast. The first case gives a strong signal from spins with short T , and short T , while the second case has contrast very similar to a conventional SSFF' technique. The theoretical expression predicts that the signal consists of multiple components which may be observed experimentally by adjusting the gradient pulses.

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