**Definition:** Refers to the minimum image size of an ideal point source and therefore reflects an imaging system’s ability to accurately reproduce the contrast available in the object. It is usually specified in terms of the point spread function (PSF) or line spread function (LSF), or by the modulation transfer function (MTF), which is the frequency space representation of the PSF. Both of these concepts assume that the imaging system is linear and stationary, which is not generally the case. Spatial resolution is often measured in two orthogonal directions: in-plane ($latex x-y$) and cross-plane ($latex z$) Definition: Refers to the minimum image size of an ideal point source and therefore reflects an imaging system’s ability to accurately reproduce the contrast available in the object. It is usually specified in terms of the point spread function (PSF) or line spread function (LSF), or by the modulation transfer function (MTF), which is the frequency space representation of the PSF. Both of these concepts assume that the imaging system is linear and stationary, which is not generally the case. Spatial resolution is often measured in two orthogonal directions: in-plane ($latex x-y$) and cross-plane ($latex z$)

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