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R2* relaxometry for the quantification of hepatic iron overload: biopsy-based calibration and comparison with the literature.
Henninger, B; Zoller, H; Rauch, S; Finkenstedt, A; Schocke, M; Jaschke, W; Kremser, C.
Afiliação
  • Henninger B; Radiology, Medical University of Innsbruck, Austria.
  • Zoller H; Internal Medicine, Medical University of Innsbruck, Austria.
  • Rauch S; Radiology, Medical University of Innsbruck, Austria.
  • Finkenstedt A; Internal Medicine, Medical University of Innsbruck, Austria.
  • Schocke M; Radiology, Medical University of Innsbruck, Austria.
  • Jaschke W; Radiology, Medical University of Innsbruck, Austria.
  • Kremser C; Radiology, Medical University of Innsbruck, Austria.
Rofo ; 187(6): 472-9, 2015 Jun.
Article em En | MEDLINE | ID: mdl-25877992
PURPOSE: We compared the calibration of hepatic iron based on R2* relaxometry and liver biopsy with similar studies that have already been published to investigate the transferability of published calibration curves. MATERIALS AND METHODS: 17 patients with clinically suspected hepatic iron overload (HIO) were enrolled. All patients underwent liver biopsy and MRI of the liver using a multi-echo gradient echo sequence (TR = 200 ms; TE-initial 0.99 ms; Delta-TE 1.41 ms; 12 echos; flip-angle: 20 °). R2* parameter maps were analyzed using manually placed regions of interest and R2* values were correlated with liver iron concentration (LIC) obtained from liver biopsy. In addition, the results of our study were compared with 6 similar, already published studies. RESULTS: A linear relationship between R2* and LIC was found. Regression analysis yielded a correlation coefficient of 0.926, a slope of 0.024 (s mg/g) [95 % CI 0.013 - 0.024] and an intercept of 0.277 (mg/g) [95 % CI -0.328 - 2.49]. We found a significant correlation between the calibration curves obtained from our study in comparison to 3/6 similar studies. The other 3 studies used a different reference standard or sequence parameters which lead to a significant difference for slope, intercept or both in comparison to our data. CONCLUSION: Calibration curves from published studies that are based on a correlation of liver biopsy and R2* can be used for the estimation of liver iron concentration, although different scanning parameters and post-processing protocols were used. Low initial TEs might be a prerequisite for pooling data for liver iron quantification. KEY POINTS: • Calibration curves from different studies can be used for liver iron quantification• For that purpose calibration curves from published studies should be based on liver biopsy• Low initial TEs might be a prerequisite for pooling data for liver iron quantification.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Imageamento por Ressonância Magnética / Sobrecarga de Ferro / Hepatopatias Tipo de estudo: Diagnostic_studies / Evaluation_studies / Guideline / Prognostic_studies Limite: Adult / Aged / Female / Humans / Male / Middle aged País/Região como assunto: Europa Idioma: En Ano de publicação: 2015 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Imageamento por Ressonância Magnética / Sobrecarga de Ferro / Hepatopatias Tipo de estudo: Diagnostic_studies / Evaluation_studies / Guideline / Prognostic_studies Limite: Adult / Aged / Female / Humans / Male / Middle aged País/Região como assunto: Europa Idioma: En Ano de publicação: 2015 Tipo de documento: Article