Hendrik de Leeuw1, Marinus A. Moerland2, Marco van Vulpen2, Peter R. Seevinck1, Chris J.G. Bakker1
1Beeld, University Medical Center, Utrecht, Netherlands; 2Radiotherapy, University Medical Center, Utrecht, Netherlands
Treatment of prostate cancer by single fraction High-Dose-Rate (HDR) brachytherapy potentially provides an improvement in prostate cancer treatment, but safe dose delivery is mandatory. Accurate localization of a HDR source requires adequate temporal and spatial resolution, which are not easily achieved by conventional MRI. In this in vitro study, we present a dual plane version of the 3D co-RASOR technique. Two orthogonal 2D center-out encoded slices allow 3D tracking of an HDR brachytherapy source in inhomogeneous tissue. The method was shown to provide a spatial accuracy comparable to CT, with an appropriate temporal resolution, 3.2 seconds, for the intended application.