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Comparative imaging study reveals that increasing radiation tube current and voltage significantly reduces CBCT fractal dimension values, highlighting the need to standardize scanning parameters.
AbstractObjective: The aim of this study was to evaluate the effects of exposure parameters on fractal dimension values using CBCT images acquired under different exposure conditions.Methods: The VistaVox S device was used to acquire the images with exposure parameters of 5 mA at 79 kVp, 7 mA at 94 kVp, and 9 mA at 94 kVp. Measurements were taken at a total of 90 ROIs, with 30 ROIs identified in each image set. ImageJ version 1.53t was used for fractal dimension analyses.Results: The agreement between measurements was assessed using the intraclass correlation coefficient (ICC). The agreement for the 5 mA/79 kVp and 7 mA/94 kVp parameters was very good (ICC = 0.92–0.93), while the agreement for the 9 mA/94 kVp parameter was good (ICC = 0.80). The fractal dimension decreases consistently as current and voltage increase, and this decrease is statistically significant. In the comparison of pure mA values (7 mA/94 kVp vs. 9 mA/94 kVp), the fractal dimension also differs significantly (p = .019 and p = .003).Conclusion: In fractal dimension measurements, the intra-observer agreement is high, and the fractal dimension decreases significantly with increasing current and voltage.
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GÖKDENİZ et al. (2026) studied this question.
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