ANALYSIS OF THE EFFECT OF THE X-RAY TUBE CURRENT ON UNIFORMITY IMAGE NOISE VALUES

This research aimed to evaluate the effects of X-ray current tube on uniformity value CT image noise. used images Siemens head water phantom. The phantom was scanned with a Somatom Scope scanner for various tubes (i.e., 180 mAs, 200 220 240 and 260 mAs) voltage 110 kV, slice thickness 3 mm, FOV mm. values in noise were analyzed using standard deviation (SD). SD measured by ROI process 5 different locations, center at o'clock, 6 9 12 o'clock CT. Based result simple linear regression test IBM SPSS ver 25, it found that significantly affected (r2=0,9768, p<0,05). showed increasing can reduce uniformity. highest mAs 0,217 HU, lowest 0,031 HU. also shows all are less than 2 HU still within acceptable limit BAPETEN regulation.