Chen, W.W.ChenFirle, E.E.Firle2022-03-092022-03-092002https://publica.fraunhofer.de/handle/publica/340972In this paper, we summarize the geometry transformation relations among volume dataset, the volume rendering and the tracker system in free-hand navigation for high dose rate brachytherapy application. Subsequently, three algorithms during free-hand navigation: the calibration of needle tip, registration and active immobilization are proposed.enfree hand navigationBrachytherapycalibrationactive patient immobilization006conference paper