gradient pulse
used to create this variation is the slice select gradient (SSG)
A gradient pulse is a short, high-frequency electromagnetic pulse used in magnetic resonance imaging (MRI) to produce gradients in the magnetic field. It is a brief, localized change in the strength of the magnetic field that is applied to the sample being imaged. Gradient pulses are an essential part of MRI and are used to encode spatial information into the magnetic resonance signal.
Gradient pulses are typically produced by passing a current through a coil, which creates a magnetic field that is superimposed onto the main magnetic field. The gradient pulse causes the atomic nuclei in the sample being imaged to absorb and emit radio waves at a frequency that is proportional to their location within the sample. By varying the strength and duration of the gradient pulses, it is possible to produce a map of the signal that reflects the spatial distribution of the atomic nuclei.
In summary, gradient pulses are an essential component of MRI that are used to encode spatial information into the magnetic resonance signal. The use of gradient pulses allows for the creation of detailed images of the internal structure of biological tissues and provides an important tool for medical diagnosis and research.
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