Optoelectronic techniques for patient repositioning in radiotherapy

Area of Science:

• Medical Physics
• Radiotherapy Technology
• Biomedical Engineering

Background:

• Patient positioning errors are a significant source of inaccuracy in radiotherapy.
• These errors can lead to increased relapse rates and radiation-induced damages.
• Current repositioning methods may lack the necessary precision for optimal patient treatment.

Purpose of the Study:

• To introduce and evaluate the ELITE movement analysis system for patient repositioning in radiotherapy.
• To develop and implement an automatic correction system for detected patient position errors.
• To enhance the accuracy and reliability of patient setup during radiotherapy sessions.

Main Methods:

• Utilized the ELITE movement analysis system for real-time patient position monitoring.
• Defined two marker disposition models for the supine position using identifiable body landmarks.
• Implemented analytical comparison of 3D coordinates between current and reference positions.
• Synchronized coordinate calculations with the patient's Functional Residual Capacity (FRC) by detecting breathing phases.

Main Results:

• Demonstrated the capability of the ELITE system for precise patient repositioning control.
• Highlighted the limitations in accuracy of commonly used optical laser repositioning systems.
• Confirmed the system's effectiveness in synchronizing measurements with patient respiratory phases.
• Showcased the potential for significant improvements in radiotherapy accuracy and reliability.

Conclusions:

• The ELITE movement analysis system offers a substantial advancement in radiotherapy patient positioning.
• Accurate patient setup is crucial for minimizing treatment errors and improving clinical outcomes.
• ELITE facilitates a balance between efficient treatment setup and precise, safe patient irradiation.