The duration of a 90 or 180 pulse depends on the strength of the B1 field. If a 180
Chapter 15, Problem 15.15(b)(choose chapter or problem)
The duration of a \(90^{\circ}\) or \(180^{\circ}\) pulse depends on the strength of the \(\mathcal{B}_1\) field. If a \(180^{\circ}\) pulse requires \(12.5 \mu \mathrm{s}\), what is the strength of the \(\mathcal{B}_1\) field? How long would the corresponding \(90^{\circ}\) pulse require?
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