CT검사시 소아환자의 적정 촬영조건에 관한 연구

Determination of optimal scan exposure factors for pediatric patients in computed tomography

Purpose In this study, In order to decrease of exposure rate and attain better image quality for protect pediatric patients. We investigated to find the optimal exposure factors for pediatric patients in computed tomography. Materials and methods : We performed this study to assesment exposure rates from using the pencil type Ionization chamber. We are using the 16 channel multi detector computed tomography(16-MDCT) on General Electric Lightspeed ultra 16. In this Experimental phantom made of each brain and abdomen types to 5kg, 5~10kg, 10~20kg, 20~40kg, 40~60kg, more 60kg etc(Standard of korea child growth 표). Results The results obtained were as followed : 1) Optimal Exposure factor of brain Phantom is : 100kVp~120kVp, 160mA~200mA(Weighting steps) 2) Optimal Exposure factor for Abdomen Phantom is : 80kVp~100kVp, 60mA~180mA(Weighting steps) 3) Measured Exposure rates : 10%~180%,(using the adult Exposure factor) 4) Measured Exposure rates : -30%~110%,(decease of one steps Exposure factor) 5) Abdomen Phantom Exposure rates is more than brain Phantom caused of beam hardening artifact in brain. Conclusion From the results of these studies, It is suggested that which are using the optimal exposure factor to decrease exposure rate and attain better image quality for protect pediatric patients. We are need to standard official certification in order to avoid of radiation hazard.