Evaluasi Nilai Signal to Noise Ratio (SNR) dengan Penerapan Aturan 10 kVp dan 15% kVp pada Objek Stepwedge
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Abstract
Radiographic images are medical images obtained using ionizing radiation. The quality of radiographic images is influenced by many factors, including exposure factors and the presence of anode heel effect. Several strategies are used to improve the quality of radiographic images while still providing a reasonable dose, one of which is the kVp rule. This study discusses the analysis of Signal to Noise Ratio (SNR) values using different rules, the 10 kVp and 15% kVp rules. This study aims to obtain a combination of exposure factors that produce images with the highest SNR. The tube voltage used is 40 kV to 70 kV, varied according to the 10 kVp and 15% kVp rules, with a total of 4 variations of exposure factors for the 10 kVP rule and 5 variations for the 15% kVp rule. An aluminum stepwedge with 10 levels with a height of 2 mm each is used as an object. The stepwedge is placed horizontally, parallel to the examination table with a distance of 100 cm from the focus of the X-ray machine. The results of the study indicate that increasing the exposure factor can increase the SNR value. The higher the tube voltage and mAs, the SNR value will increase. The results of this study indicate that the use of 70 kV and 4 mAs is more recommended because it produces lower noise than the use of 70 kV and 2 mAs.
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