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17 October 2022 Dark-field imaging on a clinical CT system: modelling of interferometer vibrations
Clemens Schmid, Manuel Viermetz, Nikolai Gustschin, Jakob Haeusele, Tobias Lasser, Thomas Koehler, Franz Pfeiffer
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Proceedings Volume 12304, 7th International Conference on Image Formation in X-Ray Computed Tomography; 1230428 (2022) https://doi.org/10.1117/12.2646676
Event: Seventh International Conference on Image Formation in X-Ray Computed Tomography (ICIFXCT 2022), 2022, Baltimore, United States
Abstract
X-ray computed tomography (CT) is an invaluable imaging technique for non-invasive medical diagnosis. However, for soft tissue in the human body the inherent small difference in attenuation limits its significance. Grating-based X-ray phase-contrast is a relatively novel imaging method which detects additional interaction mechanisms between photons and matter, namely refraction and small-angle scattering, to generate additional images with different contrast. The experimental setup involves a Talbot-Lau interferometer whose susceptibility to mechanical vibrations hindered acquisition schemes suitable for clinical routine in the past. We present a processing pipeline to identify spatially and temporally variable fluctuations occurring in the first interferometer installed on a continuously rotating clinical CT gantry. The correlations of the vibrations in the modular grating setup are exploited to identify a small number of relevant vibration modes, allowing for an artifact-free reconstruction of a sample.
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Clemens Schmid, Manuel Viermetz, Nikolai Gustschin, Jakob Haeusele, Tobias Lasser, Thomas Koehler, and Franz Pfeiffer "Dark-field imaging on a clinical CT system: modelling of interferometer vibrations", Proc. SPIE 12304, 7th International Conference on Image Formation in X-Ray Computed Tomography, 1230428 (17 October 2022); https://doi.org/10.1117/12.2646676
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KEYWORDS
Interferometers
Visibility
Principal component analysis
Sensors
Diffusion
Refractive index
Signal attenuation
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