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MLEM deconvolution of protein X-ray diffraction images based on a multiple-PSF model

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Abstract

In this paper we analyze the degradation of protein X-ray diffraction images by diffuse light distortion (DLD). In order to correct the degradation, a new multiple point spread function (PSF) model is introduced and used to restore X-ray diffraction image data (XRD). Raw PSFs are collected from isolated spots in high-resolution areas on the diffraction patterns which represent the orientation of DLDs. An adaptive ridge regression (ARR) technique is used to remove noise from the raw PSF data. A target Gaussian function is used to model the raw PSFs. A maximum likelihood expectation maximization (MLEM) algorithm combined with a multi-PSF model is employed to restore high intensity, asymmetrical protein X-ray diffraction data. Experimental results using a single and multiple PSFs are presented and discussed. We show that using a multiple PSF model in the deconvolution algorithm improved the quality of the XRD and as a result the spot integration error (?2) and corresponding electron density map are improved.

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Original languageEnglish
Pages (from-to)95-102
Number of pages8
JournalIEEE Transactions on Nanobioscience
Volume5
Issue number2
DOIs
Publication statusPublished - 30 May 2006
Peer-reviewedYes

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