Online dynamic flat-field correction for MHz microscopy data at European XFEL

Area of Science:

• * X-ray science and instrumentation
• * Advanced microscopy techniques
• * Data analysis and processing

Background:

• * High pulse intensity and repetition rate of the European X-ray Free-Electron Laser (EuXFEL) enable superior temporal resolution.
• * MHz X-ray microscopy offers high contrast and spatial resolution for time-resolved applications.
• * Baseline normalization is crucial for subsequent data processing steps like phase retrieval and modal decomposition in microscopy.

Purpose of the Study:

• * To address the limitations of standard flat-field normalization methods with stochastic X-ray Free-Electron Laser (XFEL) sources.
• * To develop and implement an online, near real-time dynamic flat-field correction method for MHz X-ray microscopy.
• * To improve data quality and aid decision-making during data acquisition at EuXFEL.

Main Methods:

• * Development of a dynamic flat-field correction method utilizing principal component analysis (PCA).
• * Application of PCA to dynamically evolving flat-field images.
• * Implementation as a near real-time analysis tool for normalizing individual X-ray projections.

Main Results:

• * Successful implementation of an online dynamic flat-field correction method.
• * Demonstrated capability to normalize individual X-ray projections in near real-time.
• * The method effectively handles the stochastic nature of XFEL sources for microscopy.

Conclusions:

• * The presented method provides a robust solution for baseline normalization in MHz X-ray microscopy at EuXFEL.
• * Enables improved data quality and facilitates advanced analysis for time-resolved experiments.
• * Enhances the utility of EuXFEL for applications requiring high temporal resolution.