| |
 |
UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:00 |
 |
|
|
|
Conference: Bucharest University Faculty of Physics 2023 Meeting
Section: Biophysics; Medical Physics
Title:
IMRT dosimetric evaluation of the commissioning of treatment planning system using anthropomorphic head and shoulder phantom
Authors:
Roberta M. NEAGOE(1), Mihai T. DUMITRACHE(2), Claudia Gabriela CHILOM(1)
Affiliation:
1) Department of Electricity, Solid Physics and Biophysics, Faculty of Physics, University of Bucharest, Măgurele, Romania
2) Emergency Central Military Hospital “Dr. Carol Davila”, Bucharest, Romania
E-mail
neagoeroberta@yahoo.com
Keywords:
Intensity modulated radiation therapy, end-to-end test, point dose measurements, patient-specific quality assurance.
Abstract:
In the present study, an accurate dosimetric evaluation of the intensity modulated radiation therapy (IMRT) workflow using the “end-to-end” test is considered. This approach follows, with the aid of an anthropomorphic head and shoulder phantom, the pathway of a real head and neck cancer patient, from imaging to dose delivery. The treatment plan was done by IMRT delivery technique with simultaneous integrated boost, using Eclipse treatment planning system (TPS) for medical linear accelerator Varian Unique. The patient-specific quality assurance (PSQA) was performed using MapCHECK device to compare measured to planned doses by Gamma analysis. Further, point dose measurements were performed using a PTW Semiflex ionization chamber in different locations into the phantom: the planning target volume (PTV) and organs at risk (OARs). The dose differences between ion chamber measurements and calculated dose from TPS are within the tolerance limits. Therefore, the results obtained in this study confirm the accuracy of local current practice of dose delivery by IMRT technique.
References:
1. Mayles P., Nahum A.E., Rosenwald J.C., Handbook of Radiotherapy Physics, Taylor & Francis Group, 2007.
2. Clark C., Gershkevitsh E., Lechner W., Van Dyk J., Venencia D., IAEA Supported National „End-to-End” Audit Programme for Dose Delivery Using Intensity-Modulated Radiation Therapy through On-Site Visits to Radiation Therapy Institutions,2019.
3. International Atomic Energy Agency (IAEA), Absorbed Dose Determination in External Beam Radiotherapy: An International Code of Practice for Dosimetry based on Standards of Absorbed Dose to Water, IAEA Technical Reports Series No. 398, IAEA, Vienna, 2000.
4.Low, D.A., Harms, W.B., Mutic, S. and Purdy, J.A., A Technique for the Quantitative Evaluation of Dose Distributions. Medical Physics, 1998.
|
|
|
|