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Reference.org
Fourier shell correlation
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<p>In <a href="/facts/Structural_biology/XRkPtHYv">structural biology</a>, as well as in virtually all sciences that produce three-dimensional data, the Fourier shell correlation (FSC) measures the normalised <a href="/facts/Cross-correlation/Fs1hY3br">cross-correlation</a> coefficient between two 3-dimensional volumes over corresponding shells in <a href="/facts/Fourier_Transform/XXhKJtc8">Fourier</a> space (i.e., as a function of spatial frequency). The FSC is the three-dimensional extension of the two-dimensional Fourier ring correlation (FRC); also known as: spatial frequency correlation function. </p>