Iterative phase retrieval in macromolecular crystal diffraction using the gradients of intensities

Bielfeldt, S.; Yefanov, O.; Mnich, M.; Chapman, H.N.

doi:10.1107/S1600576726008137

Figure 9
(a) Average SNR at Bragg peaks as a function of resolution, calculated by $[I_{\rm {true}}/{\rm std}(|I_{\rm {true}}-I_{\rm {noisy}}|)]$ where std computes the standard deviation. The red dot is the signal strength indicator η, which normalizes the SNR within the resolution shell $[{\cal S}]$ between 1.9 and 2.1 Å – in this case to $[\eta = 1]$ . (b) SNR of the molecular gradients, comparing gradients calculated from $[I_{\rm {true}}]$ and $[I_{\rm {noisy}}]$ . The insets give zoomed-in views of the SNR at the Bragg peaks at high resolution.

JOURNAL OF
APPLIED
CRYSTALLOGRAPHY

ISSN: 1600-5767

Volume 59| Part 6| December 2026|

https://doi.org/10.1107/S1600576726008137

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