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| The value of single source dual-energy CT monochromatic images in showing the rectal cancer peritoneal reflection |
| Department of Radiology, the First Affiliated Hospital of Dalian Medical University, Dalian Liaoning 116011, China |
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Abstract Objective: To investigate the value of single source dual-energy CT monochromatic images in showing the rectal cancer peritoneal reflection. Methods: One hundred and five cases of rectal cancer patients with single source dual-energy CT scan and confirmed by pathology were retrospectively analyzed, the appearance of the peritoneal reflection on mixed energy image and 11 groups of monochromatic images(40~140 keV at intervals of 10 keV) were scored by two observers, the Kappa test was used to check the consistency of the score. The Mann-Whitney U test was used to compare the scores of mixed energy image and each monochromatic image. The relationship between rectal cancer and peritoneal reflection on mixed energy image and the highest score monochromatic image were compared with the surgery record, the Chi square test was used to compare the compliance rate. Results: The consistency of the image quality scores by the two observers were better or common. The 50~80 keV images’ quality scores were higher than mixed energy image(P<0.05), the 60 keV image score was the highest. The coincidence rate of the relationship between rectal cancer and peritoneal reflection on mixed energy image and 60 keV image were 80.95%, 89.52%, with significant difference(P<0.05). Conclusion: Single source dual-energy CT of 50~80 keV images displayed peritoneal reflection are better than mixed energy image, the best is 60 keV image, and it has certain clinical value.
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Received: 14 January 2016
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2016, Vol. 27 
