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Adiabatic refocusing pulse which compensates for variable of power and off-resonance effects

✍ Scribed by M. Robin Bendall; Michael Garwood; Kâmil Uǧurbil; David T. Pegg


Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
419 KB
Volume
4
Category
Article
ISSN
0740-3194

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✦ Synopsis


Adiabatic 180 degrees inversion rf pulses can be converted to 180 degrees refocusing pulses by inverting the effective field midway during the pulse. Suitable pulses retain insensitivity to large variations in the rf field strength and act over a reasonable spectral width. Such pulses may find application in studies utilizing surface coils.


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Application of AFP (adiabatic fast passage) pulses for removal of systematic errors associated with multiple spin-echo sequences is demonstrated. The adiabatic fast passage pulses facilitate minimization of cumulative pulse errors for all three components of magnetization. It is also shown that off-