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Article Dans Une Revue Journal of Cerebral Blood Flow and Metabolism Année : 2016

A two-pool model to describe the IVIM cerebral perfusion

Résumé

IntraVoxel Incoherent Motion (IVIM) is a magnetic resonance imaging (MRI) technique capable of measuring perfusion-related parameters. In this manuscript, we show that the mono-exponential model commonly used to process IVIM data might be challenged, especially at short diffusion times. Eleven rat datasets were acquired at 7T using a diffusion-weighted pulsed gradient spin echo sequence with b-values ranging from 7 to 2500 s/mm2 at three diffusion times. The IVIM signals, obtained by removing the diffusion component from the raw MR signal, were fitted to the standard mono-exponential model, a bi-exponential model and the Kennan model. The Akaike information criterion used to find the best model to fit the data demonstrates that, at short diffusion times, the bi-exponential IVIM model is most appropriate. The results obtained by comparing the experimental data to a dictionary of numerical simulations of the IVIM signal in microvascular networks support the hypothesis that such a bi-exponential behavior can be explained by considering the contribution of two vascular pools: capillaries and somewhat larger vessels.

Dates et versions

hal-01429440 , version 1 (08-01-2017)

Identifiants

Citer

Gabrielle Fournet, Jing-Rebecca Li, Alex M Cerjanic, Bradley P Sutton, Luisa Ciobanu, et al.. A two-pool model to describe the IVIM cerebral perfusion. Journal of Cerebral Blood Flow and Metabolism, 2016, ⟨10.1177/0271678X16681310⟩. ⟨hal-01429440⟩
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