The Effect of Kilovoltage and Milliampere-Second Parameters on CT Number: Study Phantom Quality Control CT Scan

CT number is one of the indicators in determining diagnosis disease, so it necessary to ensure level accuracy. The aim determine parameters kilovoltage and tube current value. Descriptive quantitative analytic research method with previously tested linearity suitability number. Furthermore, variation kilovoltage: 80kVp, 100kVp, 140kVp value 192mAs. After that, was continued: 80mAs, 100mAs, 140mAs voltage 120kVp. Phantom image results were analyzed using radiant viewer software a region interest (ROI) size 5mm. Then analyze correlation coefficient degree relationship between milliampere-second test within tolerance limit. For variations , values ​​are water R2=0.09, fat R2=1, soft tissue R2=0.9, bone R2=0.7. As for ​​are: R2=0.7, R2=0.8