| Autor: |
Ismail E. Mohamed, Ayman G. Ibrahim, Hamdy M. Zidan, Hesham S. El-Bahkiry, Adel Y. El-sahragti |
| Jazyk: |
angličtina |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
The Egyptian Journal of Radiology and Nuclear Medicine, Vol 49, Iss 2, Pp 477-484 (2018) |
| Druh dokumentu: |
article |
| ISSN: |
0378-603X |
| DOI: |
10.1016/j.ejrnm.2018.02.003 |
| Popis: |
Outline: To address the correspondence of measured and predicted doses for different malignant tumours utilizing various gamma criteria and QA for confirmation of VMAT with an EPID and 2D array detector. Methods: 24 patients with different malignant tumors were treated by VMAT techniques on Varian IX linear accelerator with 6 MV photon beams. Eclipse treatment planning system (TPS) is used to plan Patient’s charts. Gamma Index (GI) variation was compared to the procedure of pre-treatment verification in VMAT plans. Results: The gamma criteria (DD/DTA) of dose difference and distance to agreement for (3%/3 mm), mean ± SD are γ≤1% = 99.42% ± 0.67%, γmax = 2.11 ± 0.56 and γavg = 0.19 ± 0.05 by EPID, and γ%≤1 = 99.36% ± 0.53%, γmax = 1.65 ± 0.45 and γavg = 0.22 ± 0.05 by using 2D array detector. Conclusions: Specific QA of VMAT patient (using EPID or 2D array) display great possibility to spare time and to verify individual IMRT fields. 3%/3 mm is the most appropriate of gamma criteria (DD/DTA) for VMAT plans quality assurance. Control charts are a beneficial method for verification assessment for patient specific quality control. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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