Improved reproducibility of simple quantitative indices from 99mTc-GSA liver functional imaging View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2013-04-18

AUTHORS

Gou Ogasawara, Yusuke Inoue, Yoshihiro Itoh, Satomi Tagami, Keiji Matsunaga, Kenji Miki

ABSTRACT

OBJECTIVE: We evaluated intra- and interoperator reproducibilities in calculating the conventional indices HH15 and LHL15 from (99m)Tc-diethylenetriamine pentaacetic acid galactosyl human serum albumin ((99m)Tc-GSA) scintigraphy, and proposed new, simple methods for the calculation of quantitative indices. METHODS: The results of (99m)Tc-GSA scintigraphy in 33 patients were retrospectively analyzed. Heart and liver ROIs were drawn manually to cover cardiac blood pool and entire liver, respectively, and HH15 and LHL15 were calculated. In addition, square regions of interest (ROIs) of fixed sizes were placed at the highest activity in blood pool and the liver. Using the square heart ROI, sHH15, an equivalent of HH15, was computed. Fractional liver uptake at 15 min (FLU15) was calculated using the square heart and liver ROIs. Intra- and interoperator reproducibilities, as well as correlation with Indocyanine green retention rate at 15 min (ICG R15), were assessed for these four indices by linear regression analysis. RESULTS: Substantial intra- and interoperator variabilities were found for HH15 and LHL15. The correlation coefficients for intra- and interoperator comparisons were 0.884 and 0.869 for HH15, respectively, and 0.919 and 0.917 for LHL15, respectively. The use of square ROIs instead of hand-drawn ROIs improved reproducibility. The correlation coefficients for intra- and interoperator comparisons were 0.988 and 0.973 for sHH15, respectively, and 0.989 and 0.975 for FLU15, respectively. Correlation with ICG R15 was better for sHH15 (r = 0.619) and FLU15 (r = -0.656) than for HH15 (r = 0.439) and LHL15 (r = -0.490). CONCLUSIONS: HH15 and LHL15 showed substantial intra- and interoperator variabilities, and the use of square ROIs are indicated to provide better reproducibility. More... »

PAGES

487-491

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s12149-013-0689-5

DOI

http://dx.doi.org/10.1007/s12149-013-0689-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1001079296

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/23595899


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