Three-dimensional position determination of catheters for the purpose of brachytherapy

Stephanie L. Ellenberger; Andre Verweij; Jurrien P. de Knecht

doi:10.1117/12.387725

6 June 2000 Three-dimensional position determination of catheters for the purpose of brachytherapy

Stephanie L. Ellenberger, Andre Verweij, Jurrien P. de Knecht

Proceedings Volume 3979, Medical Imaging 2000: Image Processing; (2000) https://doi.org/10.1117/12.387725
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

Treatment planning in brachytherapy depends heavily on the accurate localization of markers in a catheter implant. We are developing an interactive system to combine the image information of biplane X-ray images to reconstruct the 3D marker positions. Current systems ask the user to identify all corresponding markers in both images manually. Especially in cases where multiple, eventually crossing catheters are present this is very time consuming and difficult as markers that are visible in one image may be hidden in the other image. To improve the procedure of marker detection we apply image-processing techniques. We investigate two approaches. One is based on 3D snakes. This is a model-based technique that is not sensitive to noise or ambiguities in the image. After the user has given a number of corresponding points per catheter, the system automatically detects the complete catheter and determines all 3D-marker positions. The second approach uses edge detection in a small region of interest (ROI). In both cases, knowledge about the catheter is used to guide the marker detection algorithm. The user has to examine the result visually. In case of erroneous marker detection the user can move, add or delete single maker points. To be able to judge the accuracy of the reconstruction it is necessary to locate possible error sources. For an accurate reconstruction of the catheter positions it is important to know the exact geometry of the imaging system. With a mathematical model the influence of uncertainties in parameters on the reconstruction result is studied.

Citation Download Citation

Stephanie L. Ellenberger, Andre Verweij, and Jurrien P. de Knecht "Three-dimensional position determination of catheters for the purpose of brachytherapy", Proc. SPIE 3979, Medical Imaging 2000: Image Processing, (6 June 2000); https://doi.org/10.1117/12.387725

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