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KMID : 1103720110650050505
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Journal of the Korean Society of Radiology
2011 Volume.65 No. 5 p.505 ~ p.512
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Radiation Doses of Dual-Energy CT for Abdominopelvic CT: Comparison with Single-Energy CT
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Cho Young-Seo
Jung Woo-Kyoung
Kim Yong-Soo
Heo Jeong-Nam
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Abstract
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Purpose:To compare radiation doses of dual-energy CT (DECT) to single-energy CT (SECT) by a phantom experiment, with the application of mean tube currents for abdomino-pelvic CT.
Materials and Methods :This study includes patients who were examined by contrast-enhanced CT for kidney evaluation. We divided the patients into six groups according to sex and body mass index. Each group consisted of five patients and a total of 30 patients were evaluated. We split the body parts (abdomen and pelvis), and calculated the mean tube current of each group as well as investigated the image noise. Applying the mean mAs from a CT scan, we measured the weighted CT dose index (CTDIw) of DECT and SECT. We compared the measured CTDIw to an estimated CTDI value displayed on the CT console. We also compared the radiation dose ratio of DECT to SECT (D/S ratio) for each subgroup. The radiation doses were compared by the student’s t-test and analysis of variance.
Results:The difference of image noise between DECT and SECT was not statistically significant. Radiation dose of DECT was higher than SECT by about 21.6% (10.69 mGy, 8.79 mGy; p < 0.0001), and the measured CTDI of the DECT was significantly higher than the estimated CTDI by about 6% (p < 0.001). The D/S ratio was not significant between the six groups.
Conclusion:The measured CTDIw of abdominopelvic DECT studies were significantly higher than those of SECT.
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KEYWORD
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Dual-Energy CT , Radiation Dose , Weighted CT Dose Index , Body Mass Index
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