Comparison Flattening Filter and Flattening Filter-Free Techniques in Small-Fields Dosimetry with Various Types of Detectors.
| Autor: | Alashkar EM; Physics Department, Faculty of Science, Al-Azhar University, Cairo, Egypt., Abdelhafez HM; Physics Department, Faculty of Science, Al-Azhar University, Cairo, Egypt., Kenawy MA; Physics Department, Faculty of Science, Al-Azhar University, Cairo, Egypt.; Radiology Techniques Department, College of Health and Medical Techniques, Al-Mustaqbal University, Iraq., Hassan GM; Ionizing Radiation Metrology Laboratory, National Institute of Standards (NIS), Giza, Egypt., Ereiba KT; Physics Department, Faculty of Science, Al-Azhar University, Cairo, Egypt., Megahed A; Department of Radiotherapy, Shefaa-Alorman Hospital, Egypt. |
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| Jazyk: | angličtina |
| Zdroj: | Asian Pacific journal of cancer prevention : APJCP [Asian Pac J Cancer Prev] 2024 Jun 01; Vol. 25 (6), pp. 2105-2112. Date of Electronic Publication: 2024 Jun 01. |
| DOI: | 10.31557/APJCP.2024.25.6.2105 |
| Abstrakt: | Purpose: The aim of this study was to investigate the detector size effect on small-field dosimetry and compare the performance of 6MV WFF/FFF techniques. Methods: We investigated the detector size effect on small-field dosimetry and compared the performance of 6MV WFF/FFF techniques. PDD, profile curves, and absorbed dose were measured in water under reference conditions with 6MV (WFF/FFF) techniques. We employed Farmer FC65-P, CC13, CC01, and IBA Razor diode, with Versa Lineac. Subsequently, we replicated this assessment for small-fields under 5cmx5cm dimensions. Results: For both 6MV WFF/FFF, significant dose differences (Dmax=1.47cm), were ±4.55%, ±6.7, ±12.75% and ±33.3% for 4cmx4cm, 3cmx3cm, 2cmx2cm, and 1cmx1cm, respectively. The average difference relative to D10 was observed to be ±4.66%, ±5.73%, ±6.58%, and ±8.75% for the previous field sizes. Differences between WFF/FFF are neglected values at all field sizes>2.3%, also, the output of the largest detector FC65-P is lower at 55% in the smallest field size. Variation in the profile doesn't exceed a difference of >5% in flatness between WFF/FFF at depth10cm, across all fields, while symmetry is >1%, but radiation output is considerably lower at 55% for FC65-P chamber in 2cmx2cm, 1cmx1cm compared to the CC01 chamber and Razor diode. Significant differences in 1cmx1cm, where FC65-P chamber exhibits around 49% difference compared to Razor diode with 6MV (WFF/FFF). Conclusions: Significant differences were observed in doses with various detectors. Detector-size influences the dose. WFF/FFF techniques show no major differences in small-fields dosimetry. Utilize some situations the advantage of FFF boasting a higher dose rate, consequently reducing treatment time to half. |
| Databáze: | MEDLINE |
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