@article {47484, title = {Modeling truncated pixel values of faint reflections in MicroED images.}, journal = {Journal of Applied Crystallography}, volume = {49}, year = {2016}, month = {2016 May 11}, abstract = {

The weak pixel counts surrounding the Bragg spots in a diffraction image are important for establishing a model of the background underneath the peak and estimating the reliability of the integrated intensities. Under certain circumstances, particularly with equipment not optimized for low-intensity measurements, these pixel values may be corrupted by corrections applied to the raw image. This can lead to truncation of low pixel counts, resulting in anomalies in the integrated Bragg intensities, such as systematically higher signal-to-noise ratios. A correction for this effect can be approximated by a three-parameter lognormal distribution fitted to the weakly positive-valued pixels at similar scattering angles. The procedure is validated by the improved\ refinement\ of an atomic model against\ structure factor\ amplitudes derived from corrected micro-electron diffraction (MicroED) images.

}, doi = {10.1107/S1600576716007196}, author = {Hattne, Johan and Shi, Dan and de la Cruz, M Jason and Reyes, Francis E and Gonen, Tamir} }