PMID: 9434985Jan 22, 1998Paper

A system for nonradiographic source localization and real-time planning of intraoperative high dose rate brachytherapy

Medical Physics
Y Watanabe, L Anderson

Abstract

We have developed a system for source localization and real-time planning of interstitial volume implants for intraoperative radiation therapy (IORT) using high dose rate remote afterloading techniques. Source localization is realized by using an electromagnetic tracking device, which consists of a transmitter coil, a receiver coil, and a signal processing unit, to generate the coordinates and orientation of the receiver. A drawback of the device is its sensitivity to adjacent metallic objects. Localization accuracy was evaluated in an operating room environment, where the metallic objects closest to the receiver are surgical retractors (that, incidentally, preclude radiographic localization). For achievable separation distances, we found an rms error of 0.7 mm in determining the distance between points 2 cm apart, thereby demonstrating the feasibility of the method. The receiver is mounted on a plastic block from which projects a long stylet and the transmitter is located at about 50 cm from the receiver. The stylet is inserted sequentially into source catheters to obtain the location and orientation data that serve as input to treatment planning software. The planning program optimizes source dwell time to make calculated dos...Continue Reading

References

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Citations

Feb 15, 2005·International Journal of Radiation Oncology, Biology, Physics·James M BalterTimothy P Mate
Jun 28, 2000·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·G StrassmannN Zamboglou
Jul 13, 2000·International Journal of Radiation Oncology, Biology, Physics·G StrassmannN Zamboglou
Oct 19, 1999·International Journal of Radiation Oncology, Biology, Physics·P KneschaurekR Wehrmann
Nov 26, 1998·Medical Physics·W BirkfellnerH Bergmann
Oct 10, 1998·Strahlentherapie und Onkologie : Organ der Deutschen Röntgengesellschaft ... [et al]·P Kneschaurek

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