A Method and a System for Image Integration Using Constrained Optimization for Phase Contrast Imaging with an Arrangement of Gratings

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This invention describes a novel method and system for generating high-quality, artifact-free phase contrast images using a grating-based X-ray setup. Instead of directly integrating noisy differential phase contrast (DPC) images—which often adds noise artifacts—the method uses constrained optimization to recover integrated phase images, producing clearer, more accurate results. This process does not require extra alignment or increased X-ray exposure time, making it efficient and practical for a wide range of imaging applications.

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• Medical imaging (such as mammography or computed tomography) to reveal fine structures with higher contrast and lower radiation dose.
• Industrial inspection lines for quality control and defect detection in materials or products.
• Non-destructive testing (NDT) to image internal structures of components without causing damage, useful in aerospace, automotive, and manufacturing.
• Security screening (such as baggage scanners) to better distinguish materials based on subtle density differences.
• Life science research, allowing imaging of biological tissues or samples with reduced radiation damage.

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• Produces artifact-free, high-quality phase contrast images, improving diagnostic and inspection accuracy.
• Reduces noise-related artifacts (like horizontal stripes) by using constrained optimization instead of direct integration.
• No need for additional alignment or increased X-ray exposure time, making the method efficient and easy to implement in existing systems.
• Applicable with both coherent and incoherent X-ray sources and flexible setups (various grating arrangements and geometries).
• Enables lower radiation doses due to higher phase sensitivity, which is safer for medical and biological applications.
• Generalizable to a variety of 2D imaging applications, potentially setting a new standard in grating-based imaging.

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Patent Abstract

The present invention yields high-quality, artifact free phase contrast images from an object using an arrangement of gratings. The new method suppresses the need of direct image integration and significantly improves the quality of phase contrast images. In comparison with existing techniques, our approach does not need additional alignment work nor increased exposure time. On the other hand it delivers excellent, direct interpretable information about the phase projection within a radiographic experiment. Due to its general applicability and its simplicity in usage, the suggested invention is expected to become a standard method for a variety of 2D imaging applications using gratings arrangements in particular on medical scanners (for instance mammography), inspection at industrial production lines, non-destructive testing, and homeland security.