X-ray Imaging Heel Effect Harnessing for Spectral Discrimination
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Solution Overview
Problem
Traditional X-ray imaging lacks material discrimination due to its energy integrating nature, which fails to distinguish between different materials based on attenuation, as it treats both high-density thin materials and low-density thick materials similarly, and requires expensive dedicated hardware for spectral imaging.
Innovation Solution
The proposed solution harnesses the heel effect in X-ray imaging by altering the imaging geometry to expose each pixel sequentially to different spectra from the anode and cathode sides of the X-ray beam, using existing X-ray imagers without additional hardware, or employs a movable filter with different materials to change the beam spectrum, allowing for spectral imaging without dedicated hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional energy integrating X-ray imaging is used, then the imaging system is simple and cost-effective, but material discrimination capability is lost
Solution Approach 1:
The patent applies periodic action by alternating the X-ray tube orientation between anode-up and cathode-up positions during image acquisition. This periodic switching enables the same detector pixel to be exposed to different spectral components (harder spectrum from anode side, softer spectrum from cathode side) at different time points, thereby capturing spectral information that would otherwise be lost in conventional energy-integrating imaging.
2Measurement precision
If dedicated spectral imaging hardware is used, then spectral imaging capability is achieved, but device cost and complexity increase
Solution Approach 1:
The patent applies self-service by utilizing the inherent heel effect of the existing X-ray tube to generate spectral differences, rather than requiring external spectral-shaping components. The X-ray tube's own geometric configuration (anode angle and orientation) naturally produces the spectral variation needed for material discrimination, allowing the system to serve its own spectral imaging needs without additional hardware.
Solution Approach 2:
The patent applies universality by enabling conventional X-ray imaging systems to perform both traditional energy-integrating imaging and spectral imaging functions using the same hardware. By programmatically controlling the tube orientation and coordinating with detector readout timing, a single X-ray system can switch between imaging modes, eliminating the need for separate dedicated spectral imaging equipment.
3Loss of information
If sequential exposure to different spectra is implemented, then material discrimination is enabled, but imaging time increases
Solution Approach 1:
The patent applies continuity of useful action by acquiring both spectral components (anode-side and cathode-side exposures) in a continuous sequence during a single imaging session. Rather than requiring separate imaging sessions for different spectral acquisitions, the system alternates tube orientation and accumulates spectral data continuously, minimizing idle time and maintaining efficient workflow.
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
Enables spectral X-ray imaging using existing X-ray imagers, providing material-specific images and reducing the need for costly dedicated hardware, while maintaining image quality and material discrimination capabilities.
Implementation Method 1
the beam having different spectra on its anode side and cathode side caused by the heel effect when the X-ray source is in operation
Data Source
AI summary
An X-ray imaging apparatus (XI) including an X-ray source (XS) with a cathode (C) and an anode (A). The source (XS) is to generate an X-radiation beam (XB). An X-ray detector (XD) detects the X-radiation after interaction with an imaged object (OB). The beam (XB) has different spectra on its anode side (AS) and cathode side (CS) caused by the heel effect when the X-ray source (XS) is in operation. -ray imaging apparatus (XI) has a heel-effect-harnessing (HH) mechanism configured to cause a pixel (PX) of the detector (XD) to be alternately exposed to both, the anode side (AS) and the cathode side (CS) of the beam (XB).