evaluation of depth dose characteristics of superficial x-rays machine using different kvp and applicators diameter

Authors

m. ismail department of physics, the islamia university of bahawalpur, bahawalpur, pakistan

m. afzal department of physics, the islamia university of bahawalpur, bahawalpur, pakistan

m. nadeem bahawalpur institute of nuclear medicine and oncology (bino), bahawalpur, pakistan

a.m. rana department of physics, bahauddin zakariya university, multan, pakistan

abstract

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

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Journal title:

iranian journal of radiation research

جلد ۹، شماره ۳، صفحات ۱۵۹-۱۶۶

Keywords

[ ' r a d i o t h e r a p y t r e a t m e n t ' , ' p a n t a k t h e r a p a x s x t ' , 1 5 0 , ' d e p t h d o s e ' , ' a p p l i c a t o r s d i a m e t e r ' , ' k v p ' , ' s u p e r f i c i a l x ' , ' r a y m a c h i n e ' ]

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