The Nyquist sampling theorem defines the basic sampling relationship between image space and K space, and any sampling trajectory must meet this theorem.If the scan field of view (field-of-view, FOV) of the specified image space is FOV, then the interval of the adjacent sampling point snr of the K space must be less than or equal to 1/FOVg;On the other hand, if the expected image space resolution is Ax, then the coverage fOV of the K space must be greater than or equal to 1/0x.If the FOV is too small, the actual effective image resolution is only 1/FOV.When FOVr is reduced in half, the image becomes blurry, meaning that the spatial resolution is reduced.If the sampling interval of the K space Is Ok too large, a volume will be produced in the image;Pseudo.