Dosimetric verification of a commercial 3D treatment planning system for conformal radiotherapy with a dynamic multileaf collimator
| Autor: | S Serretiello, R Pellegrini, Giancarlo Zonca, V Mongioj, Emanuele Pignoli, Renato Marchesini, Anna Somigliana |
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| Rok vydání: | 2000 |
| Předmět: |
Materials science
Conformal radiotherapy Imaging phantom law.invention law medicine Dosimetry Computer Simulation Radiology Nuclear Medicine and imaging Radiometry Radiation treatment planning Photons Radiological and Ultrasound Technology Phantoms Imaging business.industry Radiotherapy Planning Computer-Assisted X-Ray Film X-Rays Reproducibility of Results Collimator Sagittal plane Multileaf collimator medicine.anatomical_structure Ionization chamber Radiotherapy Conformal Nuclear medicine business |
| Zdroj: | Physics in Medicine and Biology. 45:N77-N84 |
| ISSN: | 1361-6560 0031-9155 |
| DOI: | 10.1088/0031-9155/45/8/401 |
| Popis: | The dosimetric accuracy of a 3D treatment planning system (TPS) for conformal radiotherapy with a computer-assisted dynamic multileaf collimator (DMLC) was evaluated. The DMLC and the TPS have been developed for clinical applications where dynamic fields not greater than 10 x 10 cm2 and multiple non-coplanar arcs are required. Dosimetric verifications were performed by simulating conformal treatments of irregularly shaped targets using several arcs of irradiation with 6 MV x-rays and a spherical-shaped, tissue-simulating phantom. The accuracy of the delivered dose at the isocentre was verified using an ionization chamber placed in the centre of the phantom. Isodose distributions in the axial and sagittal planes passing through the centre of the phantom were measured using double-layer radiochromic films. Measured dose at the isocentre as well as isodose distributions were compared to those calculated by the TPS. The maximum percentage difference between measured and prescribed dose was less than 2.5% for all the simulated treatment plans. The mean (+/-SD) displacement between measured and calculated isodoses was, in the axial planes, 1.0 +/- 0.6 mm, 1.2 +/- 0.7 mm and 1.5 +/- 1.1 mm for 80%, 50% and 20% isodose curves, respectively, whereas in the sagittal planes it was 2.0 +/- 1.2 mm and 2.2 +/- 2 mm for 80% and 50% isodose curves, respectively. The results indicate that the accuracy of the 3D treatment planning system used with the DMLC is reasonably acceptable in clinical applications which require treatments with several non-coplanar arcs and small dynamic fields. |
| Databáze: | OpenAIRE |
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