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Effect of off-resonance on T1 saturation recovery measurement in inhomogeneous fields
Chong Duan1, Colm Ryan2, Shin Utsuzawa3
1Schlumberger-Doll Research, Cambridge, MA 02139, USA; Department of Chemistry, Washington University, Saint Louis, MO 63110, USA.
Abstract:
Saturation-recovery measurements with Carr-Purcell-Meiboom-Gill sequences are commonly employed to measure the longitudinal relaxation time constant, T1, in grossly inhomogeneous fields. We show that in general the off-resonant effect generates unexpected extra signals in the T1 measurement. In the present study, we derive a modified T1 kernel that accounts for this off-resonance effect quantitatively. The new kernel has been tested with numerical simulations and experiments, and excellent agreement is found.
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