Camera-Based Positioning for Mobile Medical X-Ray Accuracy
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Solution Overview
Problem
Existing methods for positioning a mobile medical X-ray device relative to an examination subject are prone to errors due to external influences and require costly external systems, making them difficult to implement, especially in surgical environments.
Innovation Solution
A camera system with defined positioning relative to the X-ray device records data sets of the examination subject's surface structure at different points in time, allowing for accurate determination of deviations and precise positioning through reconciliation of these data sets, enabling accurate three-dimensional reconstruction and reduced error in positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If positioning data from movement apparatus is used, then positioning function is achieved, but positioning accuracy deteriorates due to errors from external influences and slippage
Solution Approach 1:
The patent introduces a camera system as an intermediary to capture images of the examination subject at different positions. Instead of relying directly on error-prone movement apparatus data, the system uses visual markers and image processing to determine actual position, thereby mediating between the movement apparatus and the positioning requirement to achieve higher accuracy.
Solution Approach 2:
The system implements feedback by comparing the actual position (determined from camera images) with the target position and using this information to correct positioning errors. The reconciliation process between first and second data sets provides feedback on positioning accuracy, allowing the system to compensate for errors from external influences.
2Measurement precision
If external systems like laser scanners or tracking systems are used, then positioning accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The camera system serves multiple functions: it captures images for positioning determination, records visual information of the examination subject, and provides data for both navigation and verification. This multi-functionality eliminates the need for separate dedicated positioning systems like laser scanners or external tracking systems, reducing overall system complexity while maintaining high positioning accuracy.
Solution Approach 2:
The mobile medical X-ray device performs its own positioning determination using its integrated camera system, rather than relying on external positioning infrastructure. The device captures images, processes them to determine position, and uses this information for self-navigation, making the system self-sufficient and avoiding the need for costly external systems.
3Length of stationary object
If movement distance increases, then positioning coverage is improved, but positioning accuracy deteriorates due to accumulated errors
Solution Approach 1:
The system performs preliminary action by capturing images at regular intervals during movement and continuously determining position based on these images. Rather than relying on cumulative movement data that accumulates errors over distance, the system repeatedly establishes position from visual references, resetting the error accumulation at each measurement point and maintaining accuracy over long distances.
Data Source
AI summary
A method for increasing accuracy of positioning an X-ray device relative to an examination subject using a camera system includes recording a first data set, acquiring original positioning information pertaining to the X-ray device and specifying a target position of the X-ray device relative to the original position. The X-ray device is positioned out of the original position into a first approach position using the original positioning information, and a second data set is recorded. A deviation between the target position and the first approach position is determined by a reconciliation between the first data set and the second data set. The X-ray device is positioned out of the first approach position into a second approach position using the determined deviation.