X-ray Image Data Calcium Signal Suppression
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Solution Overview
Problem
Current methods for generating X-ray image data struggle to accurately display blood vessels due to calcium blooming, where calcifications appear enlarged, leading to reduced resolution and increased noise, and often require additional radiation exposure and computational effort.
Innovation Solution
The method involves acquiring X-ray projection data with an energy-selective detector across specific energy windows, determining calcium content through base material analysis, and generating a mixed X-ray projection data record with suppressed calcium content using a weighting factor, followed by reconstruction to reduce calcium blooming in X-ray image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft reconstruction kernel is used, then noise in the reconstructed X-ray image is reduced, but resolution and edge sharpness deteriorate
Solution Approach 1:
The patent segments the X-ray attenuation signal into different material components (iodine contrast medium and calcium) using base material analysis. By separating these components in the projection data before reconstruction, the method allows independent optimization of reconstruction parameters for each material, resolving the contradiction between noise reduction and edge sharpness.
Solution Approach 2:
The patent applies different reconstruction strategies to different regions and materials. By identifying calcium content in the projection data and creating separate projection data records with suppressed calcium signal, the method enables localized optimization where calcium regions are handled differently from soft tissue regions, allowing sharp edges where needed while maintaining noise characteristics where appropriate.
2Manufacturing precision
If a hard reconstruction kernel is used, then calcification mapping is improved, but image noise increases significantly
Solution Approach 1:
The patent performs preliminary base material analysis on the projection data to identify and quantify calcium content before reconstruction. By preparing separate projection data records with suppressed calcium signal in advance, the method enables the use of softer reconstruction kernels that produce lower noise images while still achieving accurate calcification mapping through the suppressed signal representation.
3Measurement precision
If additional scans are performed to calculate calcium signal, then calcium mapping accuracy is improved, but radiation exposure and computational effort increase
Solution Approach 1:
The patent segments the single scan data into multiple projection data records by performing base material analysis to separate iodine and calcium contributions. This allows calcium signal calculation from a single scan without requiring additional scans, thereby maintaining measurement precision while avoiding increased radiation exposure.
Solution Approach 2:
The patent introduces base material analysis as an intermediary processing step that enables calcium signal extraction from the existing projection data. This intermediary approach allows accurate calcium mapping without requiring additional X-ray scans, as the base material analysis acts as a computational mediator to separate calcium signal from the mixed signal.
4Manufacturing precision
If dual-energy systems are used to suppress calcium attenuation, then calcification mapping is improved, but radiation exposure and system complexity increase
Solution Approach 1:
The patent creates a virtual copy of the projection data by generating separate projection data records with suppressed calcium signal through base material analysis. This computational copying approach allows calcium suppression without requiring physical dual-energy X-ray sources, thereby improving calcification mapping while avoiding increased hardware complexity.
Solution Approach 2:
The patent replaces the mechanical/dual-energy physical system with a computational approach using base material analysis on single-energy projection data. By substituting the physical dual-energy separation mechanism with computational base material analysis, the method achieves calcium suppression without requiring complex dual-energy X-ray hardware.
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 effectively reduces calcium blooming, providing a more accurate representation of calcifications and vessel sizes without additional radiation exposure, improving image quality and diagnostic value.
Implementation Method 1
acquire a first and at least one second projection data record in respect of a specific energy window in each case with an energy-selective X-ray detector
Data Source
AI summary
A method is for generating X-ray image data of an examination object with reduced calcium blooming. The X-ray image data is based on X-ray projection data acquired with an energy-selective X-ray detector and in respect of at least two energy windows. An embodiment of the method includes determining a calcium content in the X-ray projection data by way of a base material analysis, the calcium content describing the calcium-determined part of the X-ray attenuation caused by the examination object; generating a mixed X-ray projection data record with calcium content suppressed by way of a weighting factor of less than one; and reconstructing the X-ray image data from the mixed projection data record by applying a reconstruction algorithm.