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Mamidipalli A, Hamilton G, Manning P, Hong CW, Park CC, Wolfson T, Hooker J, Heba E, Schlein A, Gamst A, Durelle J, Paiz M, Middleton MS, Schwimmer JB, Sirlin CB. Cross-sectional correlation between hepatic R2* and proton density fat fraction (PDFF) in children with hepatic steatosis. J Magn Reson Imaging 2018; 47:418-424. [PMID: 28543915 PMCID: PMC5702271 DOI: 10.1002/jmri.25748] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 04/10/2017] [Indexed: 12/28/2022] Open
Abstract
PURPOSE To determine the relationship between hepatic proton density fat fraction (PDFF) and R2* in vivo. MATERIALS AND METHODS In this Health Insurance Portability and Accountability Act (HIPAA)-compliant, Institutional Review Board (IRB)-approved, cross-sectional study, we conducted a secondary analysis of 3T magnetic resonance imaging (MRI) exams performed as part of prospective research studies in children in whom conditions associated with iron overload were excluded clinically. Each exam included low-flip-angle, multiecho magnitude (-M) and complex (-C) based chemical-shift-encoded MRI techniques with spectral modeling of fat to generate hepatic PDFF and R2* parametric maps. For each technique and each patient, regions of interest were placed on the maps in each of the nine Couinaud segments, and composite whole-liver PDFF and R2* values were calculated. Pearson's correlation coefficients between PDFF and R2* were computed for each MRI technique. Correlations were compared using Steiger's test. RESULTS In all, 184 children (123 boys, 61 girls) were included in this analysis. PDFF estimated by MRI-M and MRI-C ranged from 1.1-35.4% (9.44 ± 8.76) and 2.1-38.1% (10.1 ± 8.7), respectively. R2* estimated by MRI-M and MRI-C ranged from 32.6-78.7 s-1 (48.4 ± 9.8) and 27.2-71.5 s-1 (42.2 ± 8.6), respectively. There were strong and significant correlations between hepatic PDFF and R2* values estimated by MRI-M (r = 0.874; P < 0.0001) and MRI-C (r = 0.853; P < 0.0001). The correlation coefficients (0.874 vs. 0.853) were not significantly different (P = 0.15). CONCLUSION Hepatic PDFF and R2* are strongly correlated with each other in vivo. This relationship was observed using two different MRI techniques. LEVEL OF EVIDENCE 2 Technical Efficacy: Stage 1 J. Magn. Reson. Imaging 2018;47:418-424.
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Affiliation(s)
- Adrija Mamidipalli
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
| | - Gavin Hamilton
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
| | - Paul Manning
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
| | - Cheng William Hong
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
| | - Charlie C. Park
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
| | - Tanya Wolfson
- Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California – San Diego, San Diego, California, USA
| | - Jonathan Hooker
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
| | - Elhamy Heba
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
| | - Alexandra Schlein
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
| | - Anthony Gamst
- Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California – San Diego, San Diego, California, USA
| | - Janis Durelle
- Department of Gastroenterology, Rady Children’s Hospital San Diego, San Diego, California
| | - Melissa Paiz
- Department of Gastroenterology, Rady Children’s Hospital San Diego, San Diego, California
| | - Michael S. Middleton
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
| | - Jeffrey B. Schwimmer
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, University of California - San Diego, San Diego, California
- Department of Gastroenterology, Rady Children’s Hospital San Diego, San Diego, California
| | - Claude B. Sirlin
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
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