T₂* Mapping from Multi-Echo Dixon Sequence on Gadoxetic Acid-Enhanced Magnetic Resonance Imaging for the Hepatic Fat Quantification: Can It Be Used for Hepatic Function Assessment?.
10.3348/kjr.2017.18.4.682
- Author:
Hyunsuk YOO
1
;
Jeong Min LEE
;
Jeong Hee YOON
;
Hyo Jin KANG
;
Sang Min LEE
;
Hyun Kyung YANG
;
Joon Koo HAN
Author Information
1. Department of Radiology, Seoul National University Hospital, Seoul 03080, Korea. jmsh@snu.ac.kr
- Publication Type:Original Article
- Keywords:
Liver fibrosis;
Liver cirrhosis;
Gadoxetic acid;
T₂* map;
R₂*;
MRI;
Hepatic fat quantification
- MeSH:
Ethics Committees, Research;
Humans;
Informed Consent;
Liver;
Liver Cirrhosis;
Magnetic Resonance Imaging*;
Retrospective Studies;
ROC Curve
- From:Korean Journal of Radiology
2017;18(4):682-690
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVE: To evaluate the diagnostic value of T₂* mapping using 3D multi-echo Dixon gradient echo acquisition on gadoxetic acid-enhanced liver magnetic resonance imaging (MRI) as a tool to evaluate hepatic function. MATERIALS AND METHODS: This retrospective study was approved by the IRB and the requirement of informed consent was waived. 242 patients who underwent liver MRIs, including 3D multi-echo Dixon fast gradient-recalled echo (GRE) sequence at 3T, before and after administration of gadoxetic acid, were included. Based on clinico-laboratory manifestation, the patients were classified as having normal liver function (NLF, n = 50), mild liver damage (MLD, n = 143), or severe liver damage (SLD, n = 30). The 3D multi-echo Dixon GRE sequence was obtained before, and 10 minutes after, gadoxetic acid administration. Pre- and post-contrast T₂* values, as well as T₂* reduction rates, were measured from T₂* maps, and compared among the three groups. RESULTS: There was a significant difference in T₂* reduction rates between the NLF and SLD groups (−0.2 ± 4.9% vs. 5.0 ± 6.9%, p = 0.002), and between the MLD and SLD groups (3.2 ± 6.0% vs. 5.0 ± 6.9%, p = 0.003). However, there was no significant difference in both the pre- and post-contrast T₂* values among different liver function groups (p = 0.735 and 0.131, respectively). A receiver operating characteristic (ROC) curve analysis showed that the area under the ROC curve for using T₂* reduction rates to differentiate the SLD group from the NLF group was 0.74 (95% confidence interval: 0.63–0.83). CONCLUSION: Incorporation of T₂* mapping using 3D multi-echo Dixon GRE sequence in gadoxetic acid-enhanced liver MRI protocol may provide supplemental information for liver function deterioration in patients with SLD.
