= Gradient echo
{wiki=Gradient_echo}
A gradient echo (GRE) is a type of magnetic resonance imaging (MRI) technique used to create images of internal structures in the body. It utilizes a combination of rapidly alternating magnetic field gradients and radiofrequency (RF) pulses to generate images. Unlike spin echo techniques that rely on 180-degree refocusing pulses to correct for inhomogeneities in the magnetic field, gradient echo sequences use gradients to manipulate the phase of the spins directly, allowing for faster imaging times.
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