Simulator Verification of the Accuracy of Patient Repositioning after Virtual Simulation

Autor: Joan E. Panke, Oliver Micke, Normann Willich, Frank Bruns, Stefan Hesselmann, P. Schüller, Andreas Schuck, Kirsten Horn, Ulrich Schäfer
Rok vydání: 2002
Předmět:
Zdroj: Strahlentherapie und Onkologie. 178:715-721
ISSN: 1439-099X
0179-7158
Popis: To evaluate the frequency and amount of displacements after repositioning a patient on the physical simulator following virtual simulation. Material and Methods: After laser marking at the CT scanner and virtual simulation, patients were repositioned on the simulator. The isocenter obtained from the calculated table movements was checked by fluoroscopically measuring the distances to standardized anatomic landmarks and comparing them to the treatment plan. Results: In 86% of patients, displacements were ≤ 0.5 cm. There was no significant difference between the supine and prone position, diagnosis categories or CT reconstruction indices. The use of immobilization devices and cranial versus body stem localization did make a significant difference. Rates of exact repositioning were high in brain and head and neck patients and comparatively low in abdominal tumors and breast cancer. Conclusions: Immobilization devices play an important role for the precision of radiotherapy. Whenever precixe positioning is possible (e. g. with a head mask), virtual simulation alone might be sufficient. Patients with abdominal and breast tumors, were repositioning precision is often suboptimal, might profit from an additional physical simulation.
Databáze: OpenAIRE
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