Downloads
Abstract
Purpose: Compare percent depth dose (PDD) and off-center ratio (OCR) measured by the CC13 ionization chamber and the RAZOR silicon diode in small photon beams.
Method and Materials: Some dosimetric characteristics, such as PDD, OCR, penumbra and radiation field size, were considered in this study for 2x2, 3x3, and 4x4 cm2 field sizes. We used the CC13 ionization chamber and the RAZOR silicon diode to measure dose distribution with depth along the axis and off-center of the beam. From the results obtained, the team investigated the differences in radiation parameters mea- sured by the two types of probes above.
Results: There are significant differences in the radiation parameters investigated for the CC13 ioniza- tion chamber and the RAZOR silicon diode, especially the width of penumbra. For PDD curves, the differ- ence is less than 5% from dmax to 30 cm, however the difference becomes greater in the build-up region, which reaches to 33% at the water phatom surface. The width of penumbra measured by CC13 is always larger than that of RAZOR, the ratio of the penumbra width between two detectors is 1.8 and 1.3 for ener- gies of 6 MV and 15 MV, respectively.
Conclusion: The RAZOR silicon diode has better dose response than the CC13 ionization chamber for measuring the PDD and the OCR in small photon beams.
References
IAEA (2017), TRS 483: Dosimetry of Small Static Fields Used in External Beam Radiotherapy, Vienna, Austria.
H Keivan, D. Shahbazi-Gahrouei, A. Shanei (2018), Evaluation of Dosimetric Characteristics of Diodes and Ionization Chambers in Small Megavoltage Photon Field Dosimetry, International Journal of Radiation Research, Volume 16, No3.
Indra J. Das, George X. Ding, Andres Ahnesjo (2007), Small Fiels: Nonequilibrium Radiation Dosimetry, Med. Phys.
J. U. Wuerfel (2013), Dose Measurement in Small Fields, Medical Physics International Journal, vol 1, No 1.
Rezaee V, Shahbazi-Gahrouei D, Monadi S, Saeb M (2016), Evaluaton of error doses of treatment planning software using solid Anthropomorphic phantom, J Isfahan Med Sch.
Stefaan Tavernier (2010), Experimental Techniques in Nuclear and Particle Physics, Springer.
Timothy C.Zhu (2010), Small Fields: Dosimetry in Electron Disequilibrium Region, Journal of Physics: Conference Series 2050.
T. Siji Cyriac. et al. (2015), Out-of-Field Photon Dosimetry Study Between 3-D Conformal and Intensity Modulated Radiation Therapy in the Management of Prostate Cancer, International Journal of Radiation Research, Volume 13, No2.
Wrya Parwaie. et al. (2018), Different Dosimeters/ Detectors Used in Small-Field Dosimetry: Pros and Cons, Journal of Medical Signals & Sensors.
| Published | 21-12-2020 | |
| Fulltext |
|
|
| Language |
|
|
| Issue | No. 66 (2020) | |
| Section | Original article | |
| DOI | 10.38103/jcmhch.2020.66.15 | |
| Keywords | trường chiếu nhỏ, buồng ion hóa, diode bán dẫn, đo liều small photon beam, ionization chamber, silicon diode, dosimetry |
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright (c) 2025 Journal of Clinical Medicine Hue Central Hospital