Contrast To Noise Ratio Quality Against Current (mAs) And Voltage (kV) Variations

Abstract

Contrast to noise ratio (CNR) is a measure of contrast between tissue and background. CNR is able to visualize an object on a background that depends on the object and its contrast, if CNR is increased it will be easier to visualize using the background. This study was conducted to see the difference in variations in current strength and voltage of the X-ray tube on the contrast-to-noise ratio (CNR). Variations in Voltage (kV) and Current Strength (mAs) used are: 50 kV and 60 kV and 4 mAs, 6.4 mAs, 8 mAs, 10 mAs with variations in the thickness of the Thorax phantom, namely: 10 cm and 15 cm using the phantom as an object and an X-ray machine for imaging. The image results will be analyzed using ROI and will be processed in Microsoft Excel to produce a Contrast to noise ratio (CNR) value. The data processing carried out produced an optimal image at a variation of Voltage 60 kV with a Current Strength of 8 mAs and a thickness of 15 cm compared to other variations.