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Recent evidence suggests that the beam-induced motion of the sample during tilt-series acquisition is a major resolution-limiting factor in electron cryo-tomography (cryoET). It causes suboptimal tilt-series alignment and thus deterioration of the reconstruction quality. Here we present a novel approach to tilt-series alignment and tomographic reconstruction that considers the beam-induced sample motion through the tilt-series. It extends the standard fiducial-based alignment approach in cryoET by introducing quadratic polynomials to model the sample motion. The model can be used during reconstruction to yield a motion-compensated tomogram. We evaluated our method on various datasets with different sample sizes. The results demonstrate that our method could be a useful tool to improve the quality of tomograms and the resolution in cryoET.

Original publication

DOI

10.1016/j.jsb.2018.02.001

Type

Journal article

Journal

Journal of structural biology

Publication Date

02/02/2018

Addresses

Spanish National Research Council (CNB-CSIC), Darwin 3, 28049 Madrid, Spain. Electronic address: jj.fernandez@csic.es.