Cycloidal-spiral sampling for three-modal x-ray CT flyscans with two-dimensional phase sensitivity

DOI: 10.1038/s41598-022-25999-1

Authors: G. Lioliou (University College London (UCL)) , O. Roche I Morgo (University College London (UCL)) , S. Marathe (Diamond Light Source) , K. Wanelik (Diamond Light Source) , S. Cipiccia (University College London) , A. Olivo (University College London) , C. K. Hagen (University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scientific Reports , VOL 12

State: Published (Approved)
Published: December 2022
Diamond Proposal Number(s): 28574

Abstract: We present a flyscan compatible acquisition scheme for three-modal X-Ray Computed Tomography (CT) with two-dimensional phase sensitivity. Our approach is demonstrated using a “beam tracking” setup, through which a sample’s attenuation, phase (refraction) and scattering properties can be measured from a single frame, providing three complementary contrast channels. Up to now, such setups required the sample to be stepped at each rotation angle to sample signals at an adequate rate, to prevent resolution losses, anisotropic resolution, and under-sampling artefacts. However, the need for stepping necessitated a step-and-shoot implementation, which is affected by motors’ overheads and increases the total scan time. By contrast, our proposed scheme, by which continuous horizontal and vertical translations of the sample are integrated with its rotation (leading to a “cycloidal-spiral” trajectory), is fully compatible with continuous scanning (flyscans). This leads to greatly reduced scan times while largely preserving image quality and isotropic resolution.

Subject Areas: Biology and Bio-materials, Medicine


Instruments: I13-2-Diamond Manchester Imaging

Added On: 12/12/2022 10:45

Documents:
s41598-022-25999-1.pdf

Discipline Tags:

Biophysics Life Sciences & Biotech

Technical Tags:

Imaging Tomography