X-Ray Material Decomposition Calibration Using Phantom Pathlengths
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Solution Overview
Problem
Standard calibration procedures for X-ray imaging systems do not accommodate material decomposition, making it difficult to guarantee robust operation and requiring human intervention, which leads to inefficiencies and errors.
Innovation Solution
An X-ray imaging system incorporating a calibration phantom and an X-ray beam limiting device with calibration elements, configured to acquire projection data and determine pathlengths for material decomposition calibration, enabling automated or semi-automated calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If standard calibration procedures are used for X-ray imaging systems, then the calibration process is simple and familiar, but material decomposition cannot be performed and human intervention is required leading to errors and inefficiencies
Solution Approach 1:
A calibration phantom with known material pathlengths is introduced as an intermediary object between the X-ray source and detector. This phantom enables automated material decomposition calibration by providing reference measurements that the system uses to calculate basis material decomposition without human intervention, while avoiding the need for complex manual calibration procedures
Solution Approach 2:
The calibration phantom is positioned and prepared in advance before the actual imaging process. The system performs preliminary calibration measurements using the phantom to establish baseline data for material decomposition, enabling subsequent automated calibration during operation without requiring complex real-time adjustments
2Reliability
If material decomposition calibration is implemented without specialized calibration procedures, then the system can perform material decomposition, but robust operation cannot be guaranteed and service time increases
Solution Approach 1:
The calibration system performs self-calibration using the calibration phantom as a reference standard. The system automatically acquires projection data from the phantom, determines material pathlengths, and updates calibration parameters without requiring external intervention or lengthy service procedures, thereby ensuring reliable operation while minimizing service time
Solution Approach 2:
The calibration phantom provides known reference values for material pathlengths that serve as feedback for the calibration algorithm. The system compares measured projection data against these known values and automatically adjusts calibration parameters to minimize errors, ensuring robust and repeatable calibration results
3Productivity
If manual calibration procedures are used, then the system can be calibrated, but human errors occur and efficiency is reduced
Solution Approach 1:
Manual manual calibration operations are replaced with an automated computational system that processes projection data from the calibration phantom. The image processing circuitry automatically determines material pathlengths and performs calibration calculations, eliminating human errors while maintaining high precision through algorithmic consistency
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
Facilitates robust and efficient material decomposition calibration, reducing human error and service time by automating the calibration process.
Implementation Method 1
The X-ray source emits X-rays, which pass through a subject or object being imaged and received by the X-ray detector. The emitted X-rays are attenuated by the subject or object as they pass through, and the resulting transmitted X-rays are measured by the X-ray detector.
Data Source
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AI summary
An X-ray imaging system, such as a computed tomography (CT) computed tomography (CT) imaging system is provided for material decomposition calibration and intended for use with a calibration phantom. The X-ray imaging system comprises an X-ray source configured to emit X-rays and an X-ray detector arranged in the X-ray beam path configured to generate detector data. The calibration phantom is located in the X-ray beam path. The X-ray imaging system further comprises an X-ray beam limiting device including at least one calibration element in the X-ray beam path. The X-ray imaging system also comprises image processing circuitry configured to acquire projection data for a set of projections based on the detector data, and to determine pathlengths through at least one material of the at least one calibration element and at least one material of the calibration phantom, at least partly based on acquired projection data, for performing material decomposition calibration.