Spectral CT Angiography Contrast Protocol
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Solution Overview
Problem
Current methods for creating CT angiographies often result in inadequate representation of vascular structures, particularly in emergency situations, due to poor differentiation of acute bleeding and insufficient contrast in areas with altered circulation times, leading to increased radiation exposure and risk of contrast-induced nephropathy.
Innovation Solution
A method and system for an X-ray device that involves a novel contrast medium protocol with two distinct applications: a first application for presaturating the body region to achieve a desired equilibrium concentration, and a second application of a larger bolus for enhanced contrast, combined with spectral image data recording and concentration-dependent image reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional scans or examinations are performed to improve vascular structure representation, then image quality and diagnostic accuracy are improved, but radiation exposure increases
Solution Approach 1:
The patent applies parameter changes by utilizing spectral CT technology to capture image data at multiple energy levels (80 kV and 140 kV). This enables differentiation of iodine contrast medium from calcium deposits and other tissues through their distinct spectral signatures, achieving improved vascular structure representation without requiring additional scans and thereby reducing radiation exposure.
Solution Approach 2:
The patent introduces a new dimension by adding spectral energy information to the traditional single-energy CT imaging. By acquiring and processing data at multiple energy levels, the system creates material-specific images that enhance vascular visualization through spectral unmixing algorithms, eliminating the need for repeated scans.
2Measurement precision
If additional doses of contrast medium are administered to improve contrast, then vascular structure visibility is improved, but the risk of contrast-induced nephropathy increases
Solution Approach 1:
The patent utilizes parameter changes by exploiting the energy-dependent attenuation characteristics of iodine contrast medium. Through spectral unmixing of multi-energy data, the system enhances contrast visibility by selectively emphasizing iodine-containing structures, allowing for reduced contrast medium dosage while maintaining diagnostic quality.
Solution Approach 2:
The patent replaces the mechanical approach of increasing contrast medium quantity with a computational approach. Spectral CT processing algorithms substitute for the need for higher contrast doses by extracting material-specific information from multi-energy measurements, thereby improving visibility without proportionally increasing nephropathy risk.
3Productivity
If conventional single-energy CT imaging is used, then the imaging process is simple and fast, but the differentiation of acute bleeding and vascular structures is inadequate
Solution Approach 1:
The patent adds the spectral energy dimension to conventional CT imaging without significantly compromising imaging speed. By using dual-energy or spectral CT detectors that simultaneously or rapidly alternate between multiple energy levels, the system captures additional material discrimination information while maintaining clinical workflow efficiency.
Solution Approach 2:
The patent applies segmentation through spectral unmixing algorithms that separate contributions from different materials (iodine, calcium, blood, soft tissue) based on their distinct spectral attenuation profiles. This enables precise differentiation of acute bleeding from vascular structures by isolating iodine-enhanced vessels from non-contrast blood and other tissues.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the quality of CT angiography images by ensuring adequate contrast, reducing radiation exposure, and minimizing the risk of contrast-induced nephropathy, while allowing for more accurate representation of vascular structures and pathology.
Implementation Method 1
recording spectral image data (D) at at least two different beam energies
Data Source
AI summary
An operating method comprises: triggering administration of a first contrast medium application for presaturation of the body region with contrast medium, wherein the first contrast medium application is administered to achieve a desired equilibrium concentration; triggering administration of a second contrast medium application in the form of a bolus larger than in the first contrast medium application; recording spectral image data at at least two different beam energies; reconstructing images from the spectral image data; and outputting the images.