Correction for Mechanical Inaccuracies in a Scanning Talbot-Lau Interferometer.

Area of Science:

• Medical Imaging
• Biophysics
• Radiography

Background:

• Grating-based X-ray phase-contrast and dark-field radiography show promise for medical imaging.
• Investigating dark-field imaging for early diagnosis of human pulmonary diseases.
• Scanning interferometers used in these studies have reduced mechanical stability, leading to image artifacts from vibrations.

Purpose of the Study:

• To develop a novel method for estimating motion in grating-based X-ray imaging setups.
• To prevent image artifacts caused by vibrations in scanning interferometers.
• To improve the reliability of dark-field imaging for pulmonary disease diagnosis.

Main Methods:

• A novel maximum likelihood method was developed for motion estimation.
• The method is specifically tailored for scanning X-ray setups.
• It does not require sample-free areas and accounts for motion during and between exposures.

Main Results:

• The proposed method effectively estimates motion in grating-based X-ray imaging.
• Artifacts caused by vibrations were prevented.
• The technique is applicable to scanning setups without sample-free regions.

Conclusions:

• The novel maximum likelihood method enhances the quality of grating-based X-ray dark-field images.
• This advancement supports the use of dark-field imaging for early detection of lung diseases.
• The method offers improved motion correction for scanning radiography systems.