Subject Position Monitoring with Excluded Rotational Corrections
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Solution Overview
Problem
Existing medical systems face challenges in correcting angular deviations of subjects during positioning, which can lead to system malfunction or safety issues, requiring time-consuming adjustments to planning image data or risky workarounds.
Innovation Solution
A computer-implemented method that determines positional deviations, excluding rotational corrections when necessary, and sets reference data for monitoring, allowing for flexible and safe position corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotational corrections are performed to correct angular deviations of the subject, then positioning accuracy is improved, but safety risks increase due to potential unsafe states on the subject support unit
Solution Approach 1:
The correction procedure is segmented into translational corrections and rotational corrections. The system selectively applies only translational corrections when rotational corrections would create unsafe states, while still achieving acceptable positioning accuracy for the radiation target.
Solution Approach 2:
The system applies partial correction by excluding rotational corrections from the position correction procedure when safety concerns arise. This partial action (only translational corrections) is sufficient to maintain positioning accuracy within acceptable ranges without triggering unsafe states.
2Measurement precision
If the subject support unit is rotated to correct angular deviations, then positioning accuracy is improved, but device complexity and operational limits are exceeded due to angular limits and gravitational effects
Solution Approach 1:
The correction procedure is divided into translational corrections (applied) and rotational corrections (excluded). This segmentation allows the system to achieve positioning accuracy through translational adjustments alone, avoiding the need to operate the subject support unit beyond its angular limits.
Solution Approach 2:
Instead of rotating the subject support unit to correct angular deviations (conventional approach), the system inverts the approach by using only translational corrections of the subject while excluding rotational corrections, thereby avoiding the physical constraints of the support unit.
3Reliability
If safety features are activated to prevent unsafe states, then subject safety is improved, but system productivity decreases due to treatment interruptions
Solution Approach 1:
The system performs preliminary determination of correction data before the treatment begins, identifying which rotational corrections to exclude in advance. This preliminary action prevents treatment interruptions by ensuring the correction procedure is configured to avoid unsafe states from the start.
Solution Approach 2:
The system uses feedback from the deviation determination to dynamically adjust the correction procedure. By monitoring the deviation and selectively excluding rotational corrections based on safety criteria, the system maintains treatment continuity while ensuring subject safety.
Data Source
AI summary
The disclosed method for monitoring a subject position comprises determining a deviation of a position of a predetermined portion of a subject from a predetermined position of the predetermined portion of the subject, and, based on the deviation, determining correction data, the correction data specifying one or more corrections to be performed on the subject position as part of a position correction procedure and specifying one or more rotational corrections as being excluded from the position correction procedure. The method further comprises setting reference data as a reference for subsequent monitoring of changes of the subject position, wherein the reference data comprises the correction data and initial image data acquired prior to performing the position correction procedure and/or corrected initial image data that has been corrected based on the correction data.