Discussion
How is a T1 relaxation time usually measured?
Answer: D
Inversion recovery applies a one hundred and eighty degree pulse, waits a variable time and then reads the magnetisation with a ninety degree pulse; plotting intensity against delay gives an exponential from which T1 follows, and the delay at which the signal passes through zero is about seventy per cent of T1. Linewidth measures T2 star instead, scan counting measures nothing, and comparing fields would confound relaxation with other field dependent effects. A T1 measurement is the honest way to choose a relaxation delay for quantitative work.
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