Comparison of the radiochromic EBT2 responses for4 MV LINAC in calibration processes
DOI:
https://doi.org/10.15392/bjrs.v7i2A.656Keywords:
radiochromic film, dosimetry, calibration processesAbstract
Actually, cancer has gained a larger dimension and become a global public health problem. Radiotherapy (RT) is a neoplasia treatment and RT linear accelerators must undergo a strict dose quality control. Water or solid water phantoms can be used with this intuit. In recent years, radiochromic films with equivalent tissue composition have been widely used as dosimeters in the medical field. In this work the proposal was to analyze two distinct radiochromic film responses in water and solid water phantoms, a LINAC spectrum of 4MV beam. Solid water phantom, water phantom and EBT2 Radiochromic films were set in two distinct process of calibration. Films were exposed to a set of absorbed doses established by distinct monitor units (MU) specified in RT-center. Mathematical relations between the degree of red-intensity from digitized films and the absorbed dose for both methods were established. The coefficients of the polynomial function of the calibration curve were determined from the Origin software. The uncertainty of both processes was analyzed. The efficiency of the two calibration processes was set up. The adjustment of the calibration curve provided the coefficients of the second-order equation that relates the dose absorbed with the optical density of the film. The uncertainty regarding the calibration performed in water and solid water and the dose-error accuracy are in agreement with the literature. Both water and solid water were effective in calibration and can be used in routines of quality-control measurements. The results show that EBT2-radiochromic films are suitable to for dose-calibration in RT.
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References
INCA. Instituto nacional de câncer. Estimativa 2014: Incidência de Câncer no Brasil. Rio de Janeiro, 2014.
ACS. American Cancer Society. Global Cancer Facts and Figures. 3ed. Atlanta: ACS, 2015. Available in:
http://www.cancer.org/acs/groups/content/@research/documents/document/acspc-044738.pdf. Acesso em 07/11/2015.
HALPERIN E. C., PEREZ C. A., BRADY L. W. Principles and Practice of Radiation Oncol-ogy, Fifth Ed. Philadelphia, Pa: Lippincott Williams & Wilkins, 2008.
AAPM. American Association of Physics In Medicine. “Physical aspects of quality Assurance in radiation therapy” – AAPM Report No. 13. United States, 1994.
DIETZE G. “Dosimetric concepts and calibration of instruments”. IRPA 10 Hiroshima, May 2000, EO-3, PP 1-23. Disponível em http://www.irpa.net/irpa10/pdf/E03.pdf, 2001.
IAEA. International Atomic Energy Agency. “Absorbed dose determination in external beam radiotherapy”: An International code of practice for dosimetry based on standards of absorbed dose to water. Vienna: IAEA, 2000.
BUTSON M. J., YU P. K. N., CHEUNG T. P. Metcalfeb. “Radiochromic film for medical radia-tion dosimetry”. Mater Sci Eng: R Rep, 41(3–5), p 61–120, 2003.
ISP. International Speciality Products. Gafchromic EBT2 - self-developing film for radiotheraphy dosimetry. New Jersey: ISP, 2010.
HUET C., DAGOIS S., DERREUMAUX S., TROMPIER F., CHENAF C., ROBBES I. “Characterization and optimization of EBT2 radiochromic films dosimetry system for precise measurements of output factors in small fields used in radiotherapy”. Radiat. Meas. 47, p 40–49. doi:10.1016/j.radmeas.2011.10.020, 2012.
ISP. International Specialty Products. Gatchromic self-developing dosimetry films |EBT2| EBT3|Cyberknife|HD-V2|MD-V3|RTQA2 Ashland Inc – ISP. Available at: www.ashland.com. Accessed in maio de 2014.
DEVIC S., SEUNTJENS J., HEGYI G., PODGORSAK E. B., SOARES C. G., KIROV A. S., ALI I., WILLIAMSON J. F., ELIZONDO A. “Dosimetric properties of improved GafChromic films for seven different digitizers”. Med. Phys. 31, p 2392–2401. doi:10.1118/1.1776691, 2004.
DEVIC S., SEUNTJENS J., SHAM E., PODGORSAK E. B, SCHMIDTLEIN C. R., KIROV A. S., SOARES C. G. “Precise radiochromic film dosimetry using a flat-bed document scanner”, Medical physics. doi:10.1118/1.1929253, 2005.
L. Thompson. Resposta Radiológica e Dosimetria em Phantom Físico de Cabeça e Pescoço para Radioterapia Conformacional 3D. Belo Horizonte. 115 f. Tese (Doutorado em Ciência e Técnicas Nucleares) – Universidade Federal de Minas Gerais, Belo Horizonte, 2013.
“ImageJ – Image Processing And Analysis In Java”. Available in: http://imagej.nih.gov/ij/. Accessed in 19 de maio de 2015
“ORIGINLAB: Origin and OriginPro - Data analysis and graphing – Origin”. Available in: http://www.originlab.com/. Accessed in 19 May 2015, 2015.
CHIU-TSAO S.-T. and CHAN M. F. “Photon beam dosimetry in the superficial buildup region using radiochromic EBT film stack”. Med. Phys. 36, p 2074–2083, doi:10.1118/1.3125134, 2009.
HUGTENBURG R., ADEGUNLOYE A., BRADLEY D. “X-ray microbeam radiation therapy calculations, including polarisation effects, with the Monte Carlo code EGS5”. Nucl. Instrum. Methods Phys. Res. 619, p 221-224, 2010.
ANDREO P., CRAMB J., FRASS B. A., IONESCU-FAREA F., IZEWSKA J., LEVIN V., et al. “Comissioning and quality assurance of computerized planning systems for radiation treat-ment of cancer”. IAEA Technical Reports Series n° 430. Viena: International Atomic Energy Agency (2004).
CAMERON M., CORNELIUS I., CUTAJAR D., DAVIS J., ROSENFEL A., LERCH M., GUATELLI S. “Comparasion of phantom materials for use in quality assurance of microbeam radiation therapy”. J. Synchrotron Rad. 24, p 866-876, 2017.
ALDELAIJAN S., DEVIC S., MOHAMMED H., TOMIC N., LIANQ L.H., DEBLOIS F., SEUNTJENS J. “Evaluation of EBT-2 model GAFCHROMIC™ film performance in water”. Med. Phys. 37(7), p 3687-3693, 2010.
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