Audio-Visual Biofeedback for Respiratory Position Tracking
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Solution Overview
Problem
Respiratory motion complicates anatomic position reproducibility in thoracic radiology, necessitating larger margins during radiotherapy planning and causing errors in radiation delivery, as existing respiratory imaging techniques lack effective guidance for intermediate breathing states.
Innovation Solution
An audio-visual biofeedback system that displays a target respiratory position aligned with the current position, using a moving bar to guide patients to synchronize their breathing, with the target position determined by a learned pattern or mathematical algorithm, and displaying only necessary information to enhance tracking of intermediate states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If limiting guides for maximum and minimum breathing extent are displayed, then patients can be guided to stay within breathing limits, but no guidance is provided for intermediate breathing states
Solution Approach 1:
The breathing guide is segmented into multiple discrete markers along the respiratory cycle path, with each marker representing a specific breathing state (end-inhale, end-exhale, and intermediate points). This segmentation allows patients to receive guidance for all breathing phases, not just the extremes, thereby resolving the contradiction between providing comprehensive guidance and avoiding information overload.
Solution Approach 2:
The display transitions from showing only maximum and minimum limits (one-dimensional boundary approach) to displaying a continuous path with multiple markers along the respiratory cycle (two-dimensional trajectory approach). This dimensional change enables patients to track intermediate breathing states while maintaining clarity, as the markers are distributed along the breathing path rather than concentrated at extremes.
2Measurement precision
If multiple breathing guides are displayed continuously, then intermediate breathing states can be tracked, but the display may become overly complex
Solution Approach 1:
The essential guidance information is extracted and represented by discrete markers along the respiratory path, rather than displaying the entire continuous breathing trajectory. This extraction approach simplifies the visual display while maintaining the ability to track intermediate states, as only the critical reference points are shown rather than every moment of the breathing cycle.
Solution Approach 2:
Instead of displaying every possible breathing position (excessive action), the system displays a selective set of markers at key breathing phases (partial action). This partial display approach provides sufficient guidance for intermediate states without overwhelming the patient with unnecessary visual information, thus reducing perceived system complexity.
3Reliability
If comprehensive breathing guidance is provided, then respiratory reproducibility improves, but patient ability to follow guidance may be compromised by information overload
Solution Approach 1:
The comprehensive breathing guidance is segmented into discrete, easily distinguishable markers along the respiratory cycle. This segmentation makes the guidance more digestible for patients, as they can focus on one marker at a time rather than processing a continuous complex display. The segmented approach maintains reliability by covering all breathing phases while improving ease of operation through simplified visual cues.
Solution Approach 2:
Each breathing phase marker is designed with distinct visual characteristics that make it easily distinguishable from other markers. This local differentiation allows patients to quickly identify and respond to specific breathing states without being overwhelmed by the entire display. The localized quality of each marker enhances both reliability (by providing phase-specific guidance) and ease of operation (by making individual markers easily perceivable).
Data Source
AI summary
An improved method and apparatus for respiratory audio-visual biofeedback are disclosed. A guide patterned after a breathing cycle comfortable to the patient serves as a target. The target is displayed as a bar moving vertically upward during inhale and vertically downward during exhale, between fixed end ex-hale and end in-hale limits. The patient's current respiratory position is also displayed as a bar, oriented parallel to the target bar so that the difference between the current position and the target position is easy for the patient to see.