Slator, PJ; Hutter, J; McCabe, L; Gomes, ADS; Price, AN; Panagiotaki, E; Rutherford, MA; ... Alexander, DC; + view all Slator, PJ; Hutter, J; McCabe, L; Gomes, ADS; Price, AN; Panagiotaki, E; Rutherford, MA; Hajnal, JV; Alexander, DC; - view fewer (2017) Placenta microstructure and microcirculation imaging with diffusion MRI. Magnetic Resonance in Medicine 10.1002/mrm.27036.

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Abstract

PURPOSE: To assess which microstructural models best explain the diffusion-weighted MRI signal in the human placenta. METHODS: The placentas of nine healthy pregnant subjects were scanned with a multishell, multidirectional diffusion protocol at 3T. A range of multicompartment biophysical models were fit to the data, and ranked using the Bayesian information criterion. RESULTS: Anisotropic extensions to the intravoxel incoherent motion model, which consider the effect of coherent orientation in both microvascular structure and tissue microstructure, consistently had the lowest Bayesian information criterion values. Model parameter maps and model selection results were consistent with the physiology of the placenta and surrounding tissue. CONCLUSION: Anisotropic intravoxel incoherent motion models explain the placental diffusion signal better than apparent diffusion coefficient, intravoxel incoherent motion, and diffusion tensor models, in information theoretic terms, when using this protocol. Future work will aim to determine if model-derived parameters are sensitive to placental pathologies associated with disorders, such as fetal growth restriction and early-onset pre-eclampsia.

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