Similarity score for screening phase-retrieved maps in X-ray diffraction imaging – characterization in reciprocal space

Takayama, Y.; Nakasako, M.

doi:10.1107/S1600577523009827

Figure 5
Characterization of the 1000 maps retrieved from the diffraction pattern of an aggregate of more than 20 colloidal gold particles of 400 nm diameter recorded in the SR-XDI experiment. (a) Diffraction pattern from the aggregate. The upper-right quadrant is a magnified view of the small-angle region up to 10 µm⁻¹. (b) Distribution of the retrieved maps in the ten classes on the plane spanned by the first and second PC vectors. The symbols indicate the positions of the maps on the plane and are colored according to the scheme at the top of the panel. The coloring scheme for the ten classes are used throughout the panels. The number of the maps in each class are shown in the parentheses. The enlarged map at the top right is the reference map, which is one of a pair yielding the smallest similarity score among all the maps. The bottom panel compares the class-representative maps displaying the smallest similarity score against the reference in each class. Frequency distributions of the similarity score (c) and the Fourier error (d) of the maps in each class. (e) Resolution-dependences of the averaged cosine (left) and sine (right) terms of equation (7)

in each class. The curves of class 2 of the two terms are depicted using red open circles and error bars for the standard deviations of the two terms. The open circles are the two terms for the pair of maps yielding the smallest similarity scores among the 1000 maps. The dashed line indicates the values of the two terms for the random phase limit [equation (8)

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 31| Part 1| January 2024| Pages 95-112

https://doi.org/10.1107/S1600577523009827

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