Super-resolution x-ray phase-contrast and dark-field imaging with a single 2D grating and electromagnetic source stepping

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T1 - Super-resolution x-ray phase-contrast and dark-field imaging with a single 2D grating and electromagnetic source stepping

AU - Rix, Kristian R.

AU - Dreier, Till

AU - Shen, Tao

AU - Bech, Martin

PY - 2019/8/14

Y1 - 2019/8/14

N2 - Here we report a method for increased resolution of single exposure three modality x-ray images using super-resolution. The three x-ray image modalities are absorption-, differential phase- contrast-, and dark-field-images. To create super-resolution, a non-mechanically movable micro- focus x-ray source is used. A series of almost identical x-ray projection images is obtained while the point source is translated in a two-dimensional grid pattern. The three image modalities are extracted from fourier space using spatial harmonic analysis, also known as the single-shot method. Using super-resolution on the low-resolution series of the three modalities separately results in high- resolution images for the modalities. This approach allows to compensate for the inherent loss in resolution caused by the single-shot method without increasing the need for stability or algorithms accounting for possible motion.

AB - Here we report a method for increased resolution of single exposure three modality x-ray images using super-resolution. The three x-ray image modalities are absorption-, differential phase- contrast-, and dark-field-images. To create super-resolution, a non-mechanically movable micro- focus x-ray source is used. A series of almost identical x-ray projection images is obtained while the point source is translated in a two-dimensional grid pattern. The three image modalities are extracted from fourier space using spatial harmonic analysis, also known as the single-shot method. Using super-resolution on the low-resolution series of the three modalities separately results in high- resolution images for the modalities. This approach allows to compensate for the inherent loss in resolution caused by the single-shot method without increasing the need for stability or algorithms accounting for possible motion.

KW - x-ray

KW - Phase-contrast imaging

KW - dark-field imaging

KW - X-ray phase-contrast imaging

KW - super-resolution imaging

U2 - 10.1088/1361-6560/ab2ff5

DO - 10.1088/1361-6560/ab2ff5

M3 - Article

VL - 64

SP - 1

EP - 8

JO - Physics in Medicine and Biology

T2 - Physics in Medicine and Biology

JF - Physics in Medicine and Biology

SN - 1361-6560

IS - 16

ER -