Time-of-flight sensor for respiratory motion gating
Christian Schaller1, Jochen Penne, Joachim Hornegger
1Chair for Pattern Recognition, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr 3, 91058 Erlangen, Germany. christian.schaller@informatik.uni-erlangen.de
Medical Physics
|August 14, 2008
Summary
This study introduces a novel system using time-of-flight (ToF) sensors for real-time, markerless 3D respiratory motion capture. The system accurately tracks chest and abdomen movement, achieving high correlation with existing gating methods.
Area of Science:
- Medical Imaging
- Biomedical Engineering
- Respiratory Physiology
Background:
- Accurate respiratory motion monitoring is crucial for medical imaging and treatment.
- Current methods often rely on markers or complex setups.
- A non-invasive, real-time system is needed for improved patient care.
Purpose of the Study:
- To present a novel system for real-time, multidimensional respiratory signal acquisition.
- To utilize time-of-flight (ToF) technology for 3D surface reconstruction without markers.
- To evaluate the system's performance against a commercial respiratory gating system.
Main Methods:
- A single ToF sensor was used to acquire real-time 3D surface data of the patient's chest and abdomen.
- Multiple regions of interest were defined on the 3D reconstruction.
- Anatomy-adaptive multidimensional respiratory signals were computed.
- The ToF-based signal was compared to a commercial external respiratory gating system.
Main Results:
- The system successfully acquired real-time 3D surface reconstructions.
- High lateral resolution of ToF sensors enabled adaptive signal computation.
- An average correlation coefficient of 0.88 was achieved when comparing the ToF-based signal to the commercial system.
- Markerless, real-time multidimensional respiratory signal acquisition was demonstrated.
Conclusions:
- Time-of-flight technology provides a feasible solution for markerless, real-time respiratory motion monitoring.
- The developed system demonstrates high accuracy and adaptability.
- This approach offers a promising alternative for respiratory gating in clinical applications.
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