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http://dx.doi.org/10.3348/kjr.2013.14.6.894

MR Imaging in Patients with Suspected Liver Metastases: Value of Liver-Specific Contrast Agent Gadoxetic Acid  

Lee, Kyung Hee (Division of Abdominal Imaging, Department of Radiology, Seoul National University College of Medicine)
Lee, Jeong Min (Division of Abdominal Imaging, Department of Radiology, Seoul National University College of Medicine)
Park, Ji Hoon (Division of Abdominal Imaging, Department of Radiology, Seoul National University Bundang Hospital)
Kim, Jung Hoon (Division of Abdominal Imaging, Department of Radiology, Seoul National University College of Medicine)
Park, Hee Sun (Department of Radiology, Konkuk University School of Medicine)
Yu, Mi Hye (Division of Abdominal Imaging, Department of Radiology, Seoul National University College of Medicine)
Yoon, Jeong-Hee (Division of Abdominal Imaging, Department of Radiology, Seoul National University College of Medicine)
Han, Joon Koo (Division of Abdominal Imaging, Department of Radiology, Seoul National University College of Medicine)
Choi, Byung Ihn (Division of Abdominal Imaging, Department of Radiology, Seoul National University College of Medicine)
Publication Information
Korean Journal of Radiology / v.14, no.6, 2013 , pp. 894-904 More about this Journal
Abstract
Objective: To compare the diagnostic performance of gadoxetic acid-enhanced magnetic resonance (MR) imaging with that of triple-phase multidetector-row computed tomography (MDCT) in the detection of liver metastasis. Materials and Methods: Our institutional review board approved this retrospective study and waived informed consent. The study population consisted of 51 patients with hepatic metastases and 62 patients with benign hepatic lesions, who underwent triple-phase MDCT and gadoxetic acid-enhanced MRI within one month. Two radiologists independently and randomly reviewed MDCT and MRI images regarding the presence and probability of liver metastasis. In order to determine additional value of hepatobiliary-phase (HBP), the dynamic-MRI set alone and combined dynamic-and-HBP set were evaluated, respectively. The standard of reference was a combination of pathology diagnosis and follow-up imaging. For each reader, diagnostic accuracy was compared using the jackknife alternative free-response receiver-operating-characteristic (JAFROC). Results: For both readers, average JAFROC figure-of-merit (FOM) was significantly higher on the MR image sets than on the MDCT images: average FOM was 0.582 on the MDCT, 0.788 on the dynamic-MRI set and 0.847 on the combined HBP set, respectively (p < 0.0001). The differences were more prominent for small (${\leq}$ 1 cm) lesions: average FOM values were 0.433 on MDCT, 0.711 on the dynamic-MRI set and 0.828 on the combined HBP set, respectively (p < 0.0001). Sensitivity increased significantly with the addition of HBP in gadoxetic acid-enhanced MR imaging (p < 0.0001). Conclusion: Gadoxetic acid-enhanced MRI shows a better performance than triple-phase MDCT for the detection of hepatic metastasis, especially for small (${\leq}$ 1 cm) lesions.
Keywords
Gadoxetic acid; Magnetic resonance imaging; Computed tomography; Hepatic metastasis;
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