RF transmission in MRI

[BeulahSpray]

This is known as the RF-bandwidth (different from the receiver bandwidth). The RF-bandwidth depends on the type of pulse used. Spatially selective pulses (such as sinc-like ones) typically excite a relatively narrow range of frequencies (RF bandwidth ≈ 2 kHz). Nonselective pulses (so-called hard or rectangular pulses) excite a much larger range (RF bandwidth ≈ 250 kHz).