Adaptive Energy Threshold X-ray Imaging for Noise Reduction
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Solution Overview
Problem
Existing energy-resolved X-ray imaging systems face challenges in achieving high image quality due to improper setting of energy threshold values, which can result in excessive noise, especially when object properties vary significantly over the imaged area or volume, as global threshold settings fail to account for local attenuating characteristics.
Innovation Solution
A method that adapts energy threshold values locally for each pixel based on initial X-ray intensity values acquired in a preliminary step, allowing for optimized discrimination between low-energy and high-energy X-ray photons, thereby compensating for beam hardening effects and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If global energy threshold settings are used, then device complexity is reduced, but image quality deteriorates due to excessive noise when object properties vary significantly
Solution Approach 1:
The patent applies local quality by transitioning from global to local energy threshold settings. For each pixel, the system determines local object properties (density, thickness) and adapts the energy threshold accordingly. This allows the threshold to be optimized for local attenuating characteristics rather than using a uniform global setting, thereby improving image quality in regions with varying object properties while managing complexity through automated local adaptation.
Solution Approach 2:
The patent employs preliminary action by first acquiring preliminary X-ray intensity values for all pixels before determining the final energy thresholds. This preliminary measurement provides information about local object properties that guides the subsequent optimization of energy thresholds. By performing this preparatory step, the system can adapt thresholds to local conditions without requiring complex real-time adjustments during the main imaging process.
2Measurement precision
If energy threshold values are adapted locally for each pixel, then spectral information accuracy is improved, but acquisition time increases due to additional preliminary measurements
Solution Approach 1:
The patent merges the acquisition of preliminary X-ray intensity values with the main imaging process. The preliminary measurements are integrated into the overall acquisition workflow rather than being performed as separate additional steps. This combining approach allows the system to gather necessary local property information while maintaining an efficient acquisition timeline, balancing spectral accuracy with time constraints.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that the preliminary measurement phase seamlessly transitions into the main imaging acquisition. The system continuously collects data throughout the process, using preliminary intensity values to inform threshold optimization without interrupting the overall imaging workflow. This continuous approach minimizes idle time and maintains productive action throughout the acquisition process.
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 enables the generation of energy-resolved X-ray images with enhanced quality by optimizing energy threshold settings according to local object features, reducing noise and improving spectral information accuracy.
Implementation Method 1
an X-ray beam coming from an X-ray source is typically directed through a region of interest of an object and an X-ray detector is used to detect X-ray intensity of the X-ray beam after being transmitted through the object
Data Source
AI summary
A method for generating an energy-resolved X-ray image is proposed, usable e.g. for mammography or CT applications. First, a preferably low-dose X-ray beam (5) is directed through a region of interest of an object (15) such as a female breast and initial X-ray intensity values are acquired. Based on these initial X-ray intensity values, energy threshold values of for example a photon-counting energy-resolving X-ray detector (9) are specifically adapted to local properties and features of the object (15). With such adapted energy threshold values, energy-resolved main X-ray intensity values are acquired for finally generating the energy-resolved X-ray image. The principle of such specific adapting of energy threshold values in energy-resolved X-ray image acquisition may be advantageously implemented in scanning X-ray systems wherein first detector elements (17) of a scanned X-ray detector (9) are used to acquire the initial X-ray intensity values in order to then set the energy threshold values for subsequent detector elements (17) with which main X-ray intensity values are acquired.