Dual Phase Grating Interferometer for X-Ray Phase Contrast Imaging

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This invention presents a dual phase grating interferometer system for X-ray phase-contrast imaging that eliminates the need for absorption gratings or high-resolution detectors. Using two phase-shift gratings and a standard X-ray source, it generates high-contrast images of soft and radiation-sensitive materials with greatly improved efficiency and reduced radiation dose. The design is adaptable to high-energy X-rays, scalable to large fields of view, and suitable for both medical and industrial imaging applications.

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• Medical imaging for detailed visualization of soft tissues at lower radiation doses (e.g., mammography, brain imaging).
• Non-destructive testing and quality control of sensitive industrial materials (e.g., composites, electronics).
• Security screening for contraband or explosives with improved material contrast.
• Scientific research in biology, materials science, and physics, particularly for studying low-contrast samples.
• Tomographic scans (3D imaging) for clinical or industrial purposes.

BenefitsContent extracted from patent full text and abstract with AI.

• Greatly improves image contrast for soft and radiation-sensitive materials while minimizing radiation exposure to the sample or patient.
• Increases photon/dose efficiency compared to conventional systems by eliminating absorption gratings.
• Lowers fabrication complexity and costs, especially for high-energy applications, as phase gratings are easier to manufacture than high-aspect-ratio absorption gratings.
• Scalable to large field of view and compatible with existing standard X-ray sources and detectors, facilitating adoption in clinical and industrial settings.
• Allows for fast, single-shot imaging without the need for time-consuming mechanical phase stepping, improving throughput and reliability.
• Offers tunable sensitivity, spatial resolution, and compatibility with a wide energy range, enabling flexible system design.

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Patent Abstract

Since the very first experiments with phase-contrast imaging at synchrotrons, X-ray scientists were quite excited by the potential of this novel approach, as the "holy-grail" of boosting the contrast of soft and radiation sensitive materials under dose-control seemed to be finally at reach. The features of gratings-based interferometry (GI) are well suited for transferring this exciting technology from the exclusive synchrotron's community to a much wider basin of potential users. Particularly for medical applications, the relation between image contrast and dose has triggered tremendous efforts in the development of novel imaging devices. Such systems essentially operate near to the photon-starvation limit to cope with the fundamental dilemma of providing sufficient diagnostic sensitivity and sensibility at an acceptable, as low as reasonably achievable (ALARA) risk for the patient. If a new imaging modality were to be implemented in a clinical environment, it is needless to say that it has to be compliant with the very strict regulatory directives. The present invention proposes a system based exclusively on X-ray phase shifting components, i.e. without the use of an absorption grating, or a mask or a high-resolution detector. The novel approach is applicable at all imaging relevant energies and can be easily scalable to large field of views. The invention solves in one shot most the major limitations so far which were preventing a broad dissemination of phase contrast X-ray imaging on conventional sources.