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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:17 |
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Conference: Bucharest University Faculty of Physics 2024 Meeting
Section: Biophysics; Medical Physics
Title:
Dosimetric comparison in Volumetric Intensity Modulated (VMAT) planning for pelvic cancer using a variable number of arcs
Authors:
Denisa-Mihaela DUMITRU (1), Mirabela DUMITRACHE (2)
Affiliation:
1) Department of Electricity, Solid Physics and Biophysics, Faculty of Physics, University of Bucharest, Măgurele, Romania
2) “Colțea” Clinical Hospital, Bucharest
E-mail
denisa.mihaela@yahoo.com
Keywords:
VMAT, DVH, Gamma analysis, homogeneity index (HI), conformity index (CI)
Abstract:
Prostate, rectal and cervical cancer are the most common types of cancer spread throughout the world, representing a percentage of 80 - 90 %. The prevention of the expansion of these tumors can be achieved by radiotherapy, or the combination of radiotherapy and chemotherapy, when the tumor has exceeded stage II. The degree of complexity of the tumor, but also the choice of the specialist are the basic criteria for the application of a treatment method and its planning. The present study uses the Volumetric Intensity Modulated (VMAT) method, with a variable number of arcs for certain types of pelvic cancer. Thus, the study was based on the idea of treating 30 patients diagnosed with a type of pelvic cancer. Therefore, for 10 patients it was used a single arc, for another 10 patients two arcs were used, and for the last 10 patients, an arc and a partial arc (PA) were used. The final analysis, the evaluation of the treatment plan and the comparison of the results were carried out using special tools, such as the dose-volume histogram (DVH), represented by homogeneity (HI) and conformity (CI) indices that provide a precise quality of the treatment plan. For the comparison of dose distributions between the reference and the evaluated one, the Gamma analysis method was used.
References:
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2. ICRU 50, Prescribing, Recording and Reporting Photon Beam Therapy ICRU Report No 50, ICRU, Bethesda, MD., 1993
3. Clinical Oncology-Radiotherapy dose fractionatio, The Royal College Of Radiologists, January 2004
4. Hoskin P. J., Radiotherapy in Practice-External Beam Therapy, Oxford, 2019
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