====== FourierShellCorrelation ======
Fourier Shell Correlation (FSC) is the most commonly used method for resolution determination of a 3D structure reconstruction.

===== Usage =====
This logic applies the "gold standard" FSC calculation for resolution determination of a 3D structure reconstruction where the data had been split into two randomly chosen halves earlier. After independent reconstruction of both halves, the FSC fall-off at different resolution levels can be used to determine the reconstruction quality. Additionally, a mask can be supplied to limit the 3D volume to be calculated with. 

===== Parameters and I/O =====
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^ Parameters                 ^ Description     ^
| Calculate resolution       | Picks the resolution mode to be used |
| -> Plot threshold curves   | Enabling results in all possible threshold curves being included in the output |
| Mask                       | Enables use of an input mask |
| -> invert mask             | Invert the selected/not selected volume of the mask |
| -> Mask Threshold          | Threshold for counting mask voxel for mean calculation |
| Asymmetric units (3 sigma) | Number of asymmetric units in the 3D |
| Pixel size                 | Used pixel size in the 3Ds (Pixel/Angstrom) |

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^ Input   ^ Description ^
| First3D  | First 3D Structure/Reconstructed 3D from first half of data |
| Mask     | Optional input, can be used to restrict 3D volume to only look at certain parts of the reconstruction |
| Second3D | Second 3D Structure/Reconstructed 3D from second half of data |
| FourierShellCorrelation  | A Graph showing the calculated FSC (y-axis, ranging from 0 to 1) against resolution (x-axis, Angstrom) |

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^ Output   ^ Description ^
| FourierShellCorrelation  | A Graph showing the calculated FSC (y-axis, ranging from 0 to 1) against resolution (x-axis, Angstrom) |

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^ Written Header Values   ^ Description ^
| resolutionAt0.143 | Estimated resolution for FSC cut off at 0.143 |
| resolutionAt0.3 | Estimated resolution for FSC cut off at 0.3 |
| resolutionAt0.5 | Estimated resolution for FSC cut off at 0.5 |
| resolutionAt0.9 | Estimated resolution for FSC cut off at 0.9 |
| resolutionAt3Sigma | Estimated resolution for FSC cut off at 3 Sigma |
| resolution | Estimated resolution at the user chosen cut off value |
| maxResolution | Maximum resolution in the local map |
| meanResolution | Mean resolution in the local map |
| minResolution | Minimum resolution in the local map |
| resolutionVariance | Variance of the resolution in the local map |
| abscissaIsLogarithmical , abscissaMin, abscissaMax | For internal 1D viewer use only, to be hidden |

===== Concept =====
A Paper about FSC theory and applications can be found [[http://www.sciencedirect.com/science/article/pii/S1047847705001292|here]]