Samenvatting

The recently developed HyperCollar applicator was specifically designed to heat tumors in the head and neck region. The applicator uses twelve antennas to create an EM interference pattern, which applies heat to the target area. Patients' position and movement needs to be tightly monitored and controlled during treatment for optimal result. The purpose of the project is the development of a passive tracking system, which uses a camera to track the infrared light from a number of light sources positioned on the patient.
Several measurements were performed to find the accuracy and precision of the system. A frame holding the three infrared LEDs was moved along separate axes while being tracked. The error of the system is obtained by subtracting the fixed known displacement of the three dimensional frame from the tracked data. The measurement error increases as the object is placed further away from the centre.
A linear calibration method was used to correct measured data for the error. After calibration, the range in which the error stays below 5 mm is extended from ±30 mm to ±50 mm for the centre.
A measurement is performed in a clinical setting to get an initial idea of how much a person moves his head during a treatment. The results have shown that a healthy person moves his head a maximum of 5 mm and 3° from the centre position.
The results have shown that a infrared tracking system can be applied to track the movement of a patient after calibration. Subsequent development and implementation of a clinical setup will have to show how much a patient moves his head during an actual Hyperthermia treatment.