A step-wise approach for analysis of the mouse embryonic heart using 17.6 Tesla MRI

Rinat Gabbay-Benziv, E. Albert Reece, Fang Wang, Amnon Bar-Shir, Chris Harman, Ozhan M. Turan, Peixin Yang, Sifa Turan

Research output: Contribution to journalArticle

Abstract

Background The mouse embryo is ideal for studying human cardiac development. However, laboratory discoveries do not easily translate into clinical findings partially because of histological diagnostic techniques that induce artifacts and lack standardization. Aim To present a step-wise approach using 17.6 T MRI, for evaluation of mice embryonic heart and accurate identification of congenital heart defects. Subjects 17.5-embryonic days embryos from low-risk (non-diabetic) and high-risk (diabetic) model dams. Study design Embryos were imaged using 17.6 Tesla MRI. Three-dimensional volumes were analyzed using ImageJ software. Outcome measures Embryonic hearts were evaluated utilizing anatomic landmarks to locate the four-chamber view, the left- and right-outflow tracts, and the arrangement of the great arteries. Inter- and intra-observer agreement were calculated using kappa scores by comparing two researchers’ evaluations independently analyzing all hearts, blinded to the model, on three different, timed occasions. Each evaluated 16 imaging volumes of 16 embryos: 4 embryos from normal dams, and 12 embryos from diabetic dams. Results Inter-observer agreement and reproducibility were 0.779 (95% CI 0.653–0.905) and 0.763 (95% CI 0.605–0.921), respectively. Embryonic hearts were structurally normal in 4/4 and 7/12 embryos from normal and diabetic dams, respectively. Five embryos from diabetic dams had defects: ventricular septal defects (n = 2), transposition of great arteries (n = 2) and Tetralogy of Fallot (n = 1). Both researchers identified all cardiac lesions. Conclusion A step-wise approach for analysis of MRI-derived 3D imaging provides reproducible detailed cardiac evaluation of normal and abnormal mice embryonic hearts. This approach can accurately reveal cardiac structure and, thus, increases the yield of animal model in congenital heart defect research.

Original languageEnglish (US)
Pages (from-to)46-53
Number of pages8
JournalMagnetic Resonance Imaging
Volume35
DOIs
StatePublished - Jan 1 2017

Keywords

  • 17.6 Tesla MRI
  • Cardiac development
  • Congenital heart defects
  • Diabetic pregnancy
  • Mouse heart 3D imaging

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

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  • Cite this

    Gabbay-Benziv, R., Reece, E. A., Wang, F., Bar-Shir, A., Harman, C., Turan, O. M., Yang, P., & Turan, S. (2017). A step-wise approach for analysis of the mouse embryonic heart using 17.6 Tesla MRI. Magnetic Resonance Imaging, 35, 46-53. https://doi.org/10.1016/j.mri.2016.08.008