Clinical performance of a transmission detector array for the permanent supervision of IMRT deliveries
| Autor: | A. Rühmann, N Chofor, Björn Poppe, Kay Willborn, Dietrich Harder, Hui Khee Looe |
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| Rok vydání: | 2010 |
| Předmět: |
medicine.medical_specialty
Quality Assurance Health Care education Radiation Dosage Signal 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Beam delivery Humans Medicine Radiology Nuclear Medicine and imaging Medical physics Detector array business.industry Radiotherapy Planning Computer-Assisted Clinical performance Hematology humanities Oncology Transmission (telecommunications) 030220 oncology & carcinogenesis Reference values business Sensitivity (electronics) Quality assurance |
| Zdroj: | Radiotherapy and Oncology. 95:158-165 |
| ISSN: | 0167-8140 |
| Popis: | Background and purpose Clinical evaluation of a novel dosimetric accessory serving the permanent supervision of MLC function. Materials and methods The DAVID system (PTW-Freiburg, Germany) is a transparent, multi-wire transmission ionization chamber, placed in the accessory holder of the treatment head. Since each of the 37 individual wires is positioned exactly below the associated leaf pair of the MLC, its signal records the opening of this leaf pair during patient treatment. Results The DAVID system closes a gap in the quality assurance program, permitting the permanent in-vivo verification of IMRT plans. During dosimetric plan verification with the 2D-ARRAY (PTW-Freiburg, Germany), reference values of the 37 DAVID signals are collected, with which the DAVID readings recorded during daily patient treatment are compared. This comparison is visually displayed in the control room, and warning and alarm levels of any discrepancies can be defined. The properties of the DAVID system as a transmission device, its sensitivity to beam delivery and leaflet errors as well as its stability have been analyzed for clinically relevant examples. In a recent version, the DAVID system has been equipped with 80 wires. Conclusions The DAVID system permits the on-line detection of clinically relevant MLC discrepancies in IMRT deliveries. |
| Databáze: | OpenAIRE |
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