Figure 7
From: Imaging human teeth by phosphorus magnetic resonance with nuclear Overhauser enhancement

Schematic representation of SWIFT and ZTE pulse sequences with saturation pulses applied at the proton frequency.
For SWIFT, the excitation pulse is divided into segments, each switching RF power on and off for signal acquisition (yellow colored). For both pulse sequences, the gradients were set to the required direction and amplitude. They remained constant until adjusted for the next repetition. The saturation pulse train comprises of 129 blocks of 10 ms each with a hard pulse of 400 μs width with a delay of 9.6 ms in between.