EFFECTIVE DOSES ASSOCIATED WITH CT EXAMINATIONS AND RADIATION INDUCED LIFETIME CANCER RISK ESTIMATION

Iqra Tanveer, S Rahman, Ghulam Asghar, Muhammad Munir, Humera Mehmood, Mohammad Faheem
unpublished
BACK GRO UND: Com pute d Tom ograph y (CT) e xam inations are incre as e d s ignificantl y ove r th e pas t th re e de cade s. H ow e ve r CT contribute d s ubs tantial l y h igh e r radiation dos e s as com pare d to conve ntional x-ray proce dure s. In th is s tudy, th e radiation dos e s are e s tim ate d for h e ad and ch e s t CT proce dure s and cal cul ate d th e cance r ris k s on th e bas is of m e as ure d dos e s. M A TERIAL AND M ETH O DS: CT dos e s are e s tim ate d by us ing s
more » ... ne r de rive d param e te rs and th e rm o l um ine s ce nt dos im e te rs (TLD) for h e ad and ch e s t CT proce dure. TLD ch ips w e re pl ace d on th e e xpos e d are a of th e s e l e cte d patie nts and one TLD for e ach patie nt pl ace d outs ide th e fie l d to m e as ure th e s catte re d radiation. Age , w e igh t and h e igh t of al l s e l e cte d patie nts w e re re corde d. To e val uate th e TLD dos e , e xpos e d TLDs w e re re ad w ith TLD re ade r. RESULTS: M e an dos e s of m al e and fe m al e patie nt for h e ad CT proce dure m e as ure d w ith CT ge ne rate d dos e inde x and TLD w e re 57.59 ± 2.354 m Gy and 47.1 ± 5.35 m Gy re s pe ctive l y. M e an dos e s for ch e s t s can ge ne rate d w ith CT dos e inde x w as 8.82 ± 2.09 m Gy and m e as ure d w ith TLD cam e out to be 15.73 ± 5.2 m Gy. Th e m e an e ffe ctive dos e s cal cul ate d for CT and TLD w e re 2.0 ± 0.579 m Sv and 0.443 ± 0.043 m Sv during h e ad CT proce dure and 5.6 ± 0.9 13 m Sv and 1.7 ± 0.754 m Sv found for ch e s t CT e xam ination. Bas e d on m e as ure d data l ife tim e e xce s s cance r ris k s for h e ad and ch e s t CT w e re cal cul ate d. CO NCLUSIO N: Radiation dos e s m e as ure d from s e l e cte d proce dure s in diagnos tic CT e xam inations w e re l ow e r th an th e re com m e nde d dos e l im its and variabl e w ith in th e s am e e xam inations. Th e cal cul ate d dos e s from CT de rive d param e te rs and TLD do not e xce e d th e re com m e nde d s afe l im its for h e ad and ch e s t CT proce dure s. K e y w ords : Th e rm o l um ine s ce nt dos im e te r, e ffe ctive dos e , com pute d tom ograph y, cance r ris k , radiation dos e
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