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2001
Journal Article
Titel
Intraoperative Strahlentherapie - Fortschritt durch ein CT-gestütztes Navigationssystem
Alternative
Intraoperative radiotherapy - a CT-guided navigation system
Abstract
Kritiker der intraoperativen Radiotherapie (IORT) bemängeln die Tatsache, dass das verabreichte Bestrahlungsvolumen aufgrund fehlender intraoperativer Bildgebung nicht exakt dokumentierbar ist. Vorgestellt wird ein System zur chirurgischen Navigation und Dokumentation der Flabposition für die intraoperative Brachytherapie in Flabtechnik. Methode: Das System besteht aus einem elektromagnetischen 3D-Digitizer und einer PC-Workstation. Analog zur Neuronavigation werden präoperative Spiral-CT-Daten der Tumorregion zur Navigation und Dokumentation der Flabposition in den CT-Schnitten verwendet. Die Registrierung der erfolgt anhand eines externen Refernzsystems. Am Modellversuch und Patientenbeispiel wird die neue Methode vorgestellt.
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Introduction: The fact that conventional intraoperative radiotherapy (IORT) does not give the opportunity for exact documentation of the applied radiation volume and dose distribution has been criticised. We would like to introduce a system for surgical navigation and documentation of the flab positioning for intraoperative brachytherapy in afterloading flab technique. Methods: Our system consists of an electromagnetic 3D digitizer and a PC workstation. Preoperatively taken spiral CT scans of the tumour region are used for navigation and documentation of the flab positioning, analogous to the procedure in neuronavigation. Registration is done via an external reference system attached to the iliac bone of the patient. Results: The mean accuracy of digitalization of the 100 spheres in a pelvis model is about 2.6 +/- 0.5-3.7 +/- 0.9 mm. Mean navigation accuracy is 2.4 +/- 0.8-3.3 +/- 0.8 mm. These figures correspond to the clinical experience of our surgeons. Conclusions: The optimization of the Rab positioning by CT-guided navigation and the more accurate documentation of the dose volume and distribution in the patient is an important step towards improving the quality of individual radiotherapy. We are of the opinion that surgical navigation in the pelvic region should be subject to additional investigation in order to optimize the procedure.
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