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Daily patient set-up control in radiation therapy by coded light projection.
R Krempien1, S Daeuber, H Hoppe
1University of Heidelberg, Department of Clinical Radiology, Germany.
Studies in Health Technology and Informatics
|October 2, 2004
Summary
This study introduces a surface scanning method for daily patient positioning in conformal radiation therapy. It ensures accurate treatment delivery by correcting set-up errors quickly and reliably.
Area of Science:
- Medical Physics
- Radiation Oncology
- Image-Guided Therapy
Background:
- Conformal radiation therapy dose escalation is limited by patient set-up uncertainties.
- Accurate patient positioning is critical for effective radiation delivery and minimizing off-target exposure.
Purpose of the Study:
- To evaluate the patient's surface for daily set-up control and monitoring in radiation therapy.
- To implement and assess a novel surface-based system for precise patient alignment.
Main Methods:
- Utilized a structured light projection surface scanner for daily patient data acquisition.
- Registered daily surface scans with CT-based planning data to assess positional accuracy.
- Performed manual repositioning based on surface comparison maps until acceptable alignment (error < 1 mm) was achieved.
Main Results:
- The surface scanning system enabled accurate registration of patient position with planning data.
- Repositioning was required in some cases, with an average of 3 repetitions needed for acceptable alignment.
- The entire procedure, including registration and correction, took approximately 20 seconds per repetition.
Conclusions:
- Structured light projection surface scanning is a noninvasive, efficient, and reliable method for daily set-up control in radiation therapy.
- This technique effectively addresses set-up uncertainties, enhancing the safety and precision of conformal radiation therapy.
- The system offers a cost-effective solution for improving image-guided radiation therapy workflows.