Abstract
This work presents a new method for the accurate estimation of soft tissue thickness based on near infrared (NIR) laser measurements. By using this estimation, our goal is to develop an improved non-invasive marker-less optical tracking system for cranial radiation therapy. Results are presented for three subjects and reveal an RMS error of less than 0.34 mm.
Highlights
The combination of high acquisition rates with high accuracy has made optical tracking systems more and more popular for a wide range of medical applications
Our research focuses on the development of a non-invasive markerless optical tracking system for cranial radiation therapy
The results show a low matching error for all three subjects, which is the basis for further processing of MRI and near infrared (NIR) data
Summary
The combination of high acquisition rates with high accuracy has made optical tracking systems more and more popular for a wide range of medical applications. In radiation therapy, tracking systems provide a high potential to replace conventional immobilization techniques and x-ray based localization systems to minimize the radiation dose. Many commercial systems for surface recognition are available, a target localization accuracy in sub-millimeter range has not been achieved yet. The optical properties of soft tissue especially affect the accuracy. Our research focuses on the development of a non-invasive markerless optical tracking system for cranial radiation therapy. For this purpose, we want to combine 3D surface information using a commonly used triangulation technique with tissue thickness information from a novel optical technique. We present first 4D tomograms from three human foreheads (Video 1)
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