A pulse sequence is a specific type of programmed sequence of radiofrequency (RF) pulses and gradients used in magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) spectroscopy. The purpose of a pulse sequence is to manipulate the magnetic properties of nuclei in a sample to obtain desired spectral or imaging information. In MRI, for instance, pulse sequences are critical for creating images of the body. Each pulse sequence can optimize certain imaging parameters, such as contrast, resolution, or acquisition speed.
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