@inproceedings{4b860fb9b4c84c38b209a87d1bc6153d,
title = "Phase retrieval in femtosecond X-ray nanocrystallography",
abstract = "Protein X-ray crystallography is a method for determining the 3-dimensional structures of large biological molecules arranged in regular arrays inside a crystal. Samples of the Fourier magnitude of the molecular charge density can be measured from the amplitudes of the scattered X-rays but the determination of the Fourier phases requires chemical modification to the sample and collection of additional data. There is thus a need for a direct digital phasing method that does not require modified specimens. The diffraction from very small crystals allows for a finer sampling of the diffraction amplitude and although highly attenuated, these additional samples offer the possibility of iterative phase retrieval without the use of ancillary experimental data. Following on from a previous study [6], we examine in detail the noise characteristics of finite crystal diffraction and propose a data selection strategy to improve 3-dimensional reconstructions of the molecular charge density using iterative phase retrieval algorithms. Simulation results verify that higher noise levels can indeed be tolerated by employing such a strategy to precondition the data.",
keywords = "nanocrystallography, phase retrieval, selective sampling, shape transform, x-ray free-electron laser",
author = "Chen, {Joe P J} and John Spence and Millane, {Rick P.}",
year = "2012",
doi = "10.1145/2425836.2425847",
language = "English (US)",
isbn = "9781450314732",
series = "ACM International Conference Proceeding Series",
pages = "43--48",
booktitle = "Proceedings of IVCNZ 2012 - The 27th Image and Vision Computing New Zealand Conference",
note = "27th Image and Vision Computing New Zealand Conference, IVCNZ 2012 ; Conference date: 26-11-2012 Through 28-11-2012",
}