pseudodiffusion

pseudodiffusion

[¦sü·dō·di′fyü·zhən]
(geology)
Mixing of thin superpositioned layers of slowly accumulated marine sediments by the action of water motion or subsurface organisms.
References in periodicals archive ?
Both diffusion and perfusion can be quantified or estimated separately by multi-b values according to a bi-exponential model, including D, f, and D*, which represent the pure diffusion coefficient, perfusion fraction, and pseudodiffusion coefficient, respectively.
Measurement reproducibility of perfusion fraction and pseudodiffusion coefficient derived by intravoxel incoherent motion diffusion-weighted MR imaging in normal liver and metastases.
The effect of low b-values on the intravoxel incoherent motion derived pseudodiffusion parameter in liver.
sup][14] The ADC values behaved as a weight of the pure diffusion and pseudodiffusion, pure diffusion restriction was mainly depending on the cellularity which was increasing during fibrogenic process, [sup][5] hence the increasing of pseudodiffusion should be responsible for the ADC upward alteration.
sup][15] The water movement within extracellular space is modeled as pure diffusivity when DWI are acquired with higher b value (over 600-800 s/mm [sup]2 ), while the microapillary perfusion and tubular flow are classified as pseudodiffusion, which is predominant with low b values (under 100-200 s/mm [sup]2 ).