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ST: Fachverband Strahlen- und Medizinphysik

ST 7: Ion Radiation Therapy 2: Target Motion Management

ST 7.3: Vortrag

Mittwoch, 11. März 2009, 16:00–16:15, A021

Volume rendering in treatment planning for moving targets — •Alexander Gemmel^1,2, 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 (HDVR^TM 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.