Dosimetric, mechanical, and geometric verification of conformal dynamic arc treatment
Autor: | O. Caspiani, L. Marmiroli, Valeria Landoni, T. Malatesta, A. Bonanni, F. Tortoreto, M. Leone, L. Begnozzi, R. Capparella, A. Bufacchi, R. Fragomeni, S. delle Canne |
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Rok vydání: | 2003 |
Předmět: |
conformal dynamic arc
Radiation Phantoms Imaging business.industry Radiotherapy Planning Computer-Assisted dosimetric verification Isocenter Radiotherapy Dosage Conformal map Radiotherapy Computer-Assisted Imaging phantom Arc (geometry) Multileaf collimator Ionization chamber Geometric verification Humans Radiation Oncology Physics Medicine geometric verification Radiology Nuclear Medicine and imaging Radiotherapy Conformal Nuclear medicine business Radiation treatment planning Instrumentation |
Zdroj: | Journal of Applied Clinical Medical Physics |
ISSN: | 1526-9914 |
Popis: | A conformal dynamic arc (CD‐arc) technique has been implemented at the S. Giovanni Calibita‐Fatebenefratelli Hospital Radiotherapy Center. This technique is performed by rotational beams and a dynamic multileaf collimator (DMLC): during the treatment delivery the gantry rotates and the field shape, formed by the DMLC changes continuously. The aim of this study was to perform dosimetric, mechanical, and geometric verification to ensure that the dose calculated by a commercial treatment planning system and administered to the patient was correct, before and during the clinical use of this technique. Absolute dose values, at the isocenter and at other points placed in dose heterogeneity zone, have been verified with an ionization chamber in a solid homogeneous phantom. In uniform dose regions measured dose values resulted in agreements with the calculated doses within 2%. Isodose distributions have also been determined by radiographic films and compared with those predicted by the planning system. Distance to agreement between calculated and measured isodoses in dose gradient zone was within 2 mm. In conclusion, our results demonstrated the feasibility and the accuracy of the CD‐arc technique for achieving highly conformal dose distributions. Up till now 20 patients have been treated with CD‐arc therapy. PACS number(s): 87.53.Kn, 87.53.Dq, 87.53.Oq, 87.53.St, 87.53.Tf |
Databáze: | OpenAIRE |
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