Slice select gradient (SSG)
produces a linear shifting of the magnetic field resulting in a positive and negative tilt
Slice select gradient (SSG) is a type of gradient used in magnetic resonance imaging (MRI) to select a slice from the three-dimensional object being imaged. The SSG operates by applying a gradient in the direction perpendicular to the slice of interest. This gradient causes the spins in the object to precess at a frequency proportional to their position in space. By applying a radiofrequency pulse with a frequency matching this precession, only the spins within the selected slice will be tipped into the transverse plane and detected by the MRI receiver.
The SSG is only one of several types of gradients used in MRI. The other types include phase encoding gradients and frequency encoding gradients, which are used in combination to generate a two-dimensional image from the selected slice. The use of multiple gradients also allows for the capturing of three-dimensional images, which can be reconstructed into various planes for analysis.
Overall, the slice select gradient is a crucial component of the MRI imaging process. Without it, the MRI machine would not be able to generate clear images of specific slices of the body or object being imaged.
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