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KMID : 1103720170770020089
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Journal of the Korean Society of Radiology
2017 Volume.77 No. 2 p.89 ~ p.96
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Effective Dose in Abdominal Digital Radiography: Patient Factors
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Jang Ji-Sung
Koo Hyun-Jung
Yang Hyung-Jin
Park Jung-Hoon
Cho Young-Chul
Do Kyung-Hyun
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Abstract
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Purpose: To identify independent patient factors associated with an increased radiation dose, and to evaluate the effect of patient position on the effective dose in abdominal digital radiography.
Materials and Methods: We retrospectively evaluated the effective dose for abdominal digital radiography in 222 patients. The patients were divided into two groups based on the cut-off dose value of 0.311 mSv (the upper third quartile of dose distribution): group A (n = 166) and group B (n = 56). Through logistic regression, independent factors associated with a larger effective dose were identified. The effect of patient position on the effective dose was evaluated using a paired t-test.
Results: High body mass index (BMI) (≥ 23 kg/m2), presence of ascites, and spinal metallic instrumentation were significantly associated with a larger effective dose. Multivariate logistic regression analysis revealed that high BMI [odds ratio (OR), 25.201; p < 0.001] and ascites (OR, 25.132; p < 0.001) were significantly associated with a larger effective dose. The effective dose was significantly lesser (22.6%) in the supine position than in the standing position (p < 0.001).
Conclusion: High BMI and ascites were independent factors associated with a larger effective dose in abdominal digital radiography. Significant dose reduction in patients with these factors may be achieved by placing the patient in the supine position during abdominal digital radiography.
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KEYWORD
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Radiation Dosage, Abdominal Radiography, Digital Radiography
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