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Updated: Nov 18, 2025
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Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy FSM
Published on: August 5, 2009
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Accurate contrast determination for X-ray speckle visibility spectroscopy
Yanwen Sun1, Jordi Montana-Lopez2, Paul Fuoss1
1Linac Coherent Light Source, SLAC National Accelerator Laboratory, USA.
Journal of Synchrotron Radiation
|February 10, 2021
Summary
Numerical modeling reveals X-ray speckle visibility spectroscopy (XSVS) data interpretation is affected by detector nonidealities. A linear model corrects for errors, enabling efficient on-the-fly analysis of fast dynamics in noncrystalline materials.
Area of Science:
- Materials Science
- Spectroscopy
- X-ray Physics
Background:
- X-ray speckle visibility spectroscopy (XSVS) is a proposed method for studying fast dynamics in noncrystalline materials.
- X-ray free-electron lasers (XFELs) enable high-resolution dynamic measurements.
- Real-world X-ray detectors possess nonidealities that can affect spectroscopic data.
Purpose of the Study:
- To investigate the impact of X-ray detector nonidealities on XSVS data interpretation.
- To analyze systematic errors in contrast extraction algorithms for low-count-rate XSVS.
- To develop a method for correcting these systematic errors.
Main Methods:
- Numerical modeling and simulation of X-ray detector data.
- Analysis of contrast extraction algorithms for XSVS.
- Development and validation of a linear correction model.
Main Results:
- Finite detector charge cloud and pixel size cause photon position determination degeneracy.
- Systematic errors in contrast extraction algorithms can be corrected using a simple linear model.
- The correction model is effective even at low X-ray photon count rates.
Conclusions:
- Detector nonidealities introduce systematic errors in XSVS data.
- A linear correction model, experimentally calibrated, can accurately correct these errors.
- This approach allows for computationally efficient, on-the-fly analysis of fast material dynamics using XSVS.
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