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Evaluation of Dosimetric Parameters for Flattening Filter Free Photon Beams in Radiotherapy for Two Recent Linear Accelerator Machines |
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PP: 95-101 |
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doi:10.18576/jrna/100202
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Author(s) |
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Ahmed Rizk,
Khaled. M. El-Shahat,
Khaled. M. El-Shahat,
Mohamed S. Ibrahim,
Mohamed Ali,
Mohamed El Nagdy,
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Abstract |
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| : radiation to target and destroy malignant cells. Linear accelerators (linacs) have greatly improved this field, allowing for precise delivery of radiation doses to tumors while minimizing exposure to surrounding healthy tissues. Flattening filter-free (FFF) beams have emerged as a significant development in Linac technology, providing unique dosimetric advantages and improving treatment efficiency. Flattening filters, traditionally used in linear accelerators, help to create a uniform dose distribution across the radiation beam. Aim of the Work The dosimetric study was conducted using Varian True Beam and Elekta Versa HD linear accelerators, evaluating FFF photon beams at energies of 6 MV and 10 MV. Materials and Methods Measurements included: Percentage Depth Dose, Beam Output Factor, Beam Profiles and Dose Rate Results and Discussions The study found significant differences in dose distribution and clinical implications between the two systems: PDD Curves: Higher energy (10 MV) beams delivered greater doses at deeper tissue levels compared to 6 MV, enhancing clinical outcomes for deeper tumors. Field Size Influence: Larger field sizes improved dose delivery, with the 10 MV FFF beams showing better coverage for larger tumors. Surface Dose Trends: 6 MV FFF beams demonstrated higher surface doses, making them more effective for superficial tumors. Conclusions: The findings underscore the importance of tailored treatment planning based on dosimetric characteristics, energy selection, and machine performance. Clinicians are advised to consider these factors to optimize patient outcomes while minimizing exposure to healthy tissues. |
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