Slice selection gradient
process in which we spatially localize a particular slice in a patient is by applying the ______________________________ that creates variation to the magnetic field
A slice selection gradient is a magnetic field gradient used in magnetic resonance imaging (MRI) to selectively excite a specific slice of tissue within the body for imaging. The gradient is applied in the z-axis of the MRI scanner and varies linearly across the field of view. It is used in conjunction with a radiofrequency (RF) pulse that is tuned to the resonant frequency of the tissue of interest, allowing only the specified slice to be excited and produce a signal that can be detected by the MRI scanner.
The slice selection gradient is created by a set of gradient coils in the MRI scanner that produce a magnetic field gradient in a specific direction. By adjusting the gradient strength and timing, a specific slice can be selectively excited while surrounding tissue is not affected. This selective excitation is critical for producing clear and accurate images of specific areas of the body.
The slice selection gradient is just one of several magnetic field gradients used in MRI, including phase encoding and frequency encoding gradients. Together, these gradients allow for precise spatial localization of different tissue types within the body during MRI imaging.
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