This study discusses the effect of variations in exposure index or exposure index (EI) on subjective image quality assessment on lumbosacral radiographic examination. The method used in this research is descriptive quantitative which is done by filling out questionnaires and calculating the radiation output dose. Then to draw conclusions, perform a visual grading analysis (VGA) statistical test using the one-way ANOVA test. The results obtained by varying the EI for AP projections of 2.99 (overexposed), 2.79 (optimal), and 2.33 (underexposed) then for Lateral projections of 2.91 (overexposed), 2.76 (optimal), and 2.46 (underexposed). Furthermore, the dose calculation using the radiation output equation produces 3.158 mGy (overexposed), 0.78 mGy (optimal) and 0.57 mGy (underexposed) for the AP projection while for the lateral projection it produces a radiation dose of 3.61 mGy (overexposed), 1.52 mGy (optimal). , and 0.78 mGy (underexposed). Then to get a conclusion, VGA test was carried out using ANOVA testing, the data generated after performing ANOVA tests on AP and lateral projections showed results of 0.87 and 0.612. Based on the ANOVA results that have been carried out, it can be concluded that all respondents have the same assessment of the quality of the lumbosacral image subjectively or visually, there is no significant difference between each image but has a different EI value, but images with an overexposed EI value have a different image. better than the other two EI indicators.
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