München 2009 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
ST: Fachverband Strahlen- und Medizinphysik
ST 7: Ion Radiation Therapy 2: Target Motion Management
ST 7.3: Talk
Wednesday, March 11, 2009, 16:00–16:15, A021
Volume rendering in treatment planning for moving targets — •Alexander Gemmel1,2, John A Wolfgang2, and George TY Chen2 — 1GSI-Biophysics, Darmstadt, Germany — 2Massachusetts General Hospital, Boston, USA
Advances in computer technologies have facilitated the development of tools for 3-dimensional visualization of CT-data sets with volume rendering. The company Fovia has introduced a high definition volume rendering engine (HDVRTM by Fovia Inc., Palo Alto, USA) that is capable of representing large CT data sets with high user interactivity even on standard PCs. Fovia provides a software development kit (SDK) that offers control of all the features of the rendering engine. We extended the SDK by functionalities specific to the task of treatment planning for moving tumors. This included navigation of the patient’s anatomy in beam’s eye view, fast point-and-click measurement of lung tumor trajectories as well as estimation of range perturbations due to motion by calculation of (differential) water equivalent path lengths for protons and carbon ions on 4D-CT data sets. We present patient examples to demonstrate the advantages and disadvantages of volume rendered images as compared to standard 2-dimensional axial plane images. Furthermore, we show an example of a range perturbation analysis. We conclude that volume rendering is a powerful technique for the representation and analysis of large time resolved data sets in treatment planning.