Journal Officiel de la Société de Radiologie d’ Afrique Noire Francophone / Official Journal of the Radiological Society of Francophone Africa

Local reference dose level evaluation in chest radiography in Yaounde

Odette N. Samba, Jean Yomi, Romeo Talla F., Alain G. Juimo, Fai C. Lukong

Résumé


Objectif: Les doses re§ues durant les examens de radiologie conventionnelle ne sont pas pr©cis©ment connues. Le but de cette ©tude ©tait de r©aliser un audit de dose pour les examens du thorax post©rieur-ant©rieur (PA) et lat©ral (LAT), dâanalyser les proc©dures et ©tablir le niveau local de r©f©rence diagnostique (NLRD).

M©thode : Un nombre total de 715 patients pour 882 radiographies issues de sept institutions sanitaires de la ville de Yaound© ont particip©   cette ©tude. La dose   la surface dâentr©e (ESD) des patients adultes effectuant les examens de thorax PA et de thorax LAT a ©t© ©valu©e en utilisant un algorithme math©matique et le facteur de r©trodiffusion standard.

R©sultats: Les ESDs moyennes variaient de 0,28   0,73 mGy pour le thorax PA et de 0,39   2,09 mGy pour le thorax LAT. Pour chaque incidence, il a ©t© not© une grande variation des doses aux patients dans un mªme h´pital et entre les h´pitaux. Le 75¨me percentile de la valeur ESD, 0,39 mGy, de lâexamen du thorax PA est sup©rieure au niveaux de r©f©rence diagnostiques (NRD) obtenus dans des ©tudes similaires dans certains pays dâAfrique et les NRD ©tablis par les organisations internationales. La valeur de 1,33 mGy obtenue   lâexamen du thorax LAT est comparable aux NRD ©tablis par les organisations internationales.

Conclusion : Lâutilisation des courtes distances foyer-film (DFF) et les charges (mAs) ©lev©es ont ©t© identifi©e comme les principales causes de d©passement de dose aux patients.  Les autres facteurs ont ©t© lâabsence du control qualit© et la performance des ©quipements.Cette ©tude montre la n©cessit©du respect des protocoles et techniques dâexamens radiologiques, de contr´le qualit© des ©quipements et de lâassurance qualit© permettant de r©duire la dose aux patients dans nos h´pitaux. 


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