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Proton magnetic resonance spectroscopy and ultrasound for hepatic fat quantification

  • Imperial College London
    ,
  • Imperial College Healthcare NHS Trust
Research Output:
Contribution to journal
Article
 Peer-review

Abstract

Aim:  The increasing prevalence of fatty liver disease requires routine assessment methods. Proton magnetic resonance spectroscopy (1H MRS) is increasingly used for steatosis measurement, but due to cost, is unlikely to become a widely-used screening tool. Ultrasound is cheaper and more widely available, although subject to observer variability. Our aim was to determine the sensitivity and specificity of ultrasound against 1H MRS, using MRS as a gold standard, for the detection and quantification of hepatic fat content. Methods:  Fifty adults participated (43 men, seven women) in this study. Hepatic steatosis was assessed by ultrasound and 1H MRS. Images were graded by two independent radiologists to classify severity and distribution of liver fat. Results:  Ultrasound detected liver fat infiltration in 82% of cases measurable by 1H MRS, while liver fat was detectable in 44% of cases graded absent by ultrasound. Ultrasound grading was subjective, with the radiologists in agreement in 53% of cases (κ = 0.39, P = 0.002). Considerable overlap in intrahepatocellular lipid content was observed between different grades: absent (0.0–1.58%), mild (2.2–16.2%), moderate (4.9–26.7%) and severe (8.1–76.8%) steatosis. Ultrasound could not detect liver fat levels below 2% as measured by 1H MRS Conclusion:  Ultrasound is less sensitive than 1H MRS in detecting very low levels of liver fat content, but is sensitive to fatty infiltration greater than 2%. There is a tendency of higher ultrasound grades to correlate with higher degrees of fatty infiltration, although some overlap exists. Our findings are still consistent with ultrasound being useful as a low cost screening tool.

Publication Information

Output type

Research Output:
Contribution to journal
Article
 Peer-review

Original language

English

Pages from-to (Number of pages)

Pages 399-406

Journal (Volume, Issue Number)

Hepatology Research (Volume 40, Issue 4)

Publication milestones

  • Published - 01/04/2010

Publication status

Published - 01/04/2010

ISSN

1386-6346

Publication IDs

  • handle.net: 10547/594762
  • Scopus: 77954353659

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