X-ray Source Calibration via Field of View Analysis
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Solution Overview
Problem
Medical imaging systems with overhead tube suspension systems face misalignment issues due to ceiling warping or shifting, leading to inaccurate positioning of the X-ray source, resulting in deficient images and requiring tedious manual calibration prone to human error.
Innovation Solution
A system and method for calibrating the X-ray source position using a controller that determines the position based on the field of view, generating edge points and distances, and calculating offset values to adjust the field of view, incorporating cameras and sensors for accurate alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration is performed at each location, then positioning accuracy can be ensured, but the process becomes time-consuming and prone to human error
Solution Approach 1:
The system performs self-calibration by automatically capturing images of the calibration object at multiple positions, processing these images to determine positional relationships, and adjusting its own positioning parameters without requiring manual intervention. The controller automatically compares detected positions with expected positions and generates correction values, enabling the system to calibrate itself efficiently and accurately.
2Reliability
If manual calibration is performed by technicians, then calibration can be completed, but human error may occur reducing reliability
Solution Approach 1:
The patent replaces manual mechanical calibration operations with an automated image-based calibration system. The controller automatically captures images, processes them to extract positional information, calculates calibration parameters, and adjusts the positioning system without requiring manual measurement or adjustment operations, thereby eliminating human error while maintaining ease of operation through automated workflows.
3Measurement precision
If the positioning system tracks X-ray source location continuously, then accurate positioning can be maintained, but misalignment may occur due to ceiling warping or shifting over time
Solution Approach 1:
The system performs preliminary calibration by capturing images of a calibration object at multiple predetermined positions before actual imaging operations. It processes these images to determine the relationship between the positioning system and the actual physical positions, generating correction values in advance that compensate for systematic errors such as ceiling warping or installation variations, thereby ensuring stable and accurate positioning throughout operation.
4Adaptability or versatility
If multiple images are taken at different locations, then comprehensive imaging coverage is achieved, but the need for recalibration at each location increases complexity
Solution Approach 1:
The patent implements a universal calibration approach where a single calibration object is used to establish positioning relationships across multiple locations. The controller captures images at various positions, processes them collectively to determine a unified positioning model that applies throughout the imaging area, eliminating the need for separate calibration procedures at each location and simplifying the overall process while maintaining comprehensive imaging coverage.
Data Source
AI summary
A method of calibrating a system for imaging a subject is provided. The method includes determining a position of an X-ray source of the system operative to transmit X-rays through the subject; and calibrating the position of the X-ray source with respect to a detector of the system, based at least in part on a field of view of the X-ray source, the detector operative to receive the X-rays transmitted by the X-ray source. In embodiments, the method includes positioning an X-ray source of the system via a controller at one or more calibration positions based at least in part on at least one camera of the system. In such embodiments the X-ray source is disposed on a mobile arm and operative to transmit X-rays through the subject, and a field of view of the X-ray source is directed substantially towards the detector at each of the calibration positions.