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AWT IMAGE

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:: Volume 9, Issue 3 (12-2011) ::
Int J Radiat Res 2011, 9(3): 159-166 Back to browse issues page
Evaluation of depth dose characteristics of superficial X-rays machine using different kVp and applicators diameter
M. Ismail , M. Afzal , M. Nadeem , A.M. Rana , S. Amjad , S.A. Buzdar
, ismaeel_malik@yahoo.com
Abstract:   (11320 Views)
Background: Radiotherapy Treatment Planning requires different dosimetric quantities as input in order to calculate a desired dose distribution. This study has been focused to evaluate the depth dose characteristics of superficial X-rays being used for radiotherapy treatment. Materials and Methods: Computerized 3-D water phantom of multi-data system was used. The measurements were made through PTW (Physikalirsch-Technische Werkstalten) farmer type NT-30006 waterproof ionization chamber of 0.6cc, and PTW electrometer for digital dose rate reading in Gy/min using five different diameter applicators and filters at five different values of accelerating potentials (kVps). Results: The dose rate at various kVp X-ray beams was observed to decrease significantly with increasing depth in water phantom for all applicator diameters from 98% (at 0.1cm depth) down to 43% (at 2cm i.e. reference condition). The dose rate increases by increasing the value of kVp with a maximum at 150 kVp (1.6 and 0.93 Gy/ min for respective applicator diameters 2.5cm and 10cm). Applicator with 2.5cm diameter demonstrates better dose rate at 85kVp at different depths. PDD decreases lower than 50% for all combination of applicators and kVps at/or above 2cm depth so these measurements should not be considered for treatment planning. Conclusion: Higher energy X-rays are suggested to be used for applicators of higher diameters and smaller energy X-rays for applicators having smaller diameters. Iran. J. Radiat. Res., 2011 9(3): 159-166
Keywords: Radiotherapy treatment, Pantak Therapax SXT-150, depth dose, applicators diameter, kVp, superficial X-ray machine
Full-Text [PDF 357 kb]   (9914 Downloads)    
Type of Study: Original Research | Subject: Radiation Biology
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Ismail M, Afzal M, Nadeem M, Rana A, Amjad S, Buzdar S. Evaluation of depth dose characteristics of superficial X-rays machine using different kVp and applicators diameter. Int J Radiat Res 2011; 9 (3) :159-166
URL: http://ijrr.com/article-1-802-en.html


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Volume 9, Issue 3 (12-2011) Back to browse issues page
International Journal of Radiation Research
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