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KMID : 1151820180120050659
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Journal of the Korean Society of Radiology
2018 Volume.12 No. 5 p.659 ~ p.667
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The Effect of Body Mass Index on Entrance Surface Air Kerma in Abdominal X-ray Radiography Using Automatic Exposure Control
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Koo No-Hyun
Yoon Hee-Soo
Choi Kwan-Woo
Lee Jong-Eun
Kim Jeong-Jin
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Abstract
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The purpose of this study was to determine the effect of body mass index (BMI) on entrance surface air kerma (ESAK) in abdominal X-ray radiography using automatic exposure control (AEC). This study included 321 patients who underwent abdominal X-ray using AEC, and we correlated ESAK with height, weight, BMI and compared mean ESAK according to BMI grades (Underweight, Normal, Overweight, Obese 1, Obese 2). As a result, Weight (R 2 =0.777, p<.001) and BMI (R 2 =0.835, p<.001) were positively associated with ESAK, but no significant association was found between height (R 2 =0.075, p<.001) and ESAK. The mean ESAK with respect to BMI grades showed statistically significant difference and in the post-hoc analysis, the existence of 5 subgroups at the significance level of 0.05 indicated that there were differences in the ESAK in all BMI grades. Also, as the increment of ESAK between two neighboring BMI grades increases from Underweight to Obese 2, the exposure dose dramatically increased as the BMI increased. Thus, an excessive exposure dose due to increasing BMI when using AEC should be acknowledged and Efforts to reduce dose should be taken, such as: by fixing the exposure conditions.
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KEYWORD
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Body mass index, Automatic exposure control, Abdominal X-ray radiography
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