Computer Tomography Method and Assembly for Determining Features of a Measurement Object

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This invention relates to an improved computer tomography (CT) method and system for determining the dimensional features of a measurement object. The method corrects measurement errors caused by physical phenomena such as scattered radiation, beam hardening, and various sensor and reconstruction artifacts. Corrections are performed by using synthetic radiographs generated from an approximate geometric model (like a CAD model) of the object, allowing for the simulation and subsequent compensation of error-inducing effects, thus enabling more precise measurements in CT scans.

Use CasesContent extracted from patent full text and abstract with AI.

• Quality inspection and dimensional measurement of manufactured parts in industrial settings, especially where high accuracy is required.
• Non-destructive testing (NDT) of materials and components for internal faults or structural analysis.
• Medical imaging for improving accuracy in the measurement of anatomical features or implants.
• Archaeological or paleontological research using CT scans to analyze delicate or unique artifacts with higher accuracy.
• Research and development in material science requiring precise internal measurements of composites, metals, or assembled components.
• Accurate reverse engineering by obtaining exact internal and external dimensions of complex objects.

BenefitsContent extracted from patent full text and abstract with AI.

• Significantly improves the accuracy of CT-based measurements by correcting for various physical and equipment-induced errors.
• Flexible: Applicable to a wide range of measurement objects and compatible with multiple types of prior object models (CAD, previous scans, etc.).
• Reduces the impact of errors even when only an approximate geometry of the object is available.
• Enhances reliability of CT measurements in quality-critical fields such as aerospace, automotive, and medical device manufacturing.
• Automates and streamlines the correction process, decreasing the time and expertise required for manual correction or data post-processing.
• Facilitates compliance with strict industry standards for part verification and certification.

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Patent Abstract

The invention relates to a computer tomography method for dimensionally determining features of a measurement object, through which a radiation is passed in several rotational positions, wherein measurement deviations due to the scattered radiation or other physical effects are corrected. In order to avoid or correct measurement deviations in particular due to scattered radiation or due to other physical effects such as beam hardening, afterglow effects, or the like, it is proposed, for example, that the radiographs are corrected by means of synthetic radiographs, calculated from a geometry that is determined in advance or know or from a model of the geometry, wherein the geometry or the model of the geometry at least roughly corresponds to the measurement object.