Volume 23, Number 151 (1-2017)                   RJMS 2017, 23(151): 43-51 | Back to browse issues page


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Ataei G, khadem abolfazli M, shabestani monfared A. Evaluation of X-radiation beam quality characteristics of experimental and simulated surface. RJMS. 2017; 23 (151) :43-51
URL: http://rjms.iums.ac.ir/article-1-3236-en.html

Abstract:   (1214 Views)

One of the most common methods used in radiation therapy for the treatment of superficial skin lesions using the ortho-voltage radiation X (the kVp 300), respectively. One of the most important indicators for the treatment of this type of device, the quality of the X-ray output is usually half the thickness of the absorption (HVL) Vanrzhy show photons effective. However, in this study, the coefficient of homogeneity was examined as a factor. Materials and Methods: In this study, the half-absorption layer (HVL) and homogeneity coefficient of the X-ray surface voltage was determined kV180 experimental and simulated with Monte Carlo method and the results were compared with the EGSnrc code. Using the measured absorption curve for this exposure through the layers of the weakening of the clinic was drawn with appropriate interpolation of the curve, the half-absorption layer (HVL) and homogeneity coefficient, respectively. The package EGSnrc, the code BEAMnrc to simulate photon and electron transfer up to receive daily intravaginal and BEAMDP for coefficient homogeneity systematically and draw the output spectrum (using data from phase space code BEAMnrc) and the code DOSXYZnrc to trace the curve of percentage depth dose the water phantom was used. The results show that the mean percentage difference between the HVL and homogeneity coefficient obtained from simulation and experiment 2, 96/4% and 01/3%, respectively. Conclusion: According to previous studies that measured HVL of difference between experimental and simulated 2% to over 10% were reported as the mean difference between the 96/4%, respectively. The difference is that this is reasonable. Homogeneity coefficient was calculated from the above previous reports due to differences in the code is justified. Considering the limitations of the clinics, the present method because of the simplicity of the layout and the similarity of the clinical conditions seem to have good performance.

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Type of Study: Research | Subject: Biophysics

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