The application of a gamma distribution model to diffusion-weighted images of the orofacial region.

ABSTRACT:

Objectives

This study evaluated the correlation among the diffusion-derived parameters obtained by monoexponential (ME), intravoxel incoherent motion (IVIM) and γ distribution (GD) models and compared these parameters among representative orofacial tumours.

Methods

Ninety-two patients who underwent 1.5 T MRI including diffusion-weighted imaging were included. The shape parameter (κ), scale parameter (θ), ratio of the intracellular diffusion (ƒ₁), extracellular diffusion (ƒ₂) and perfusion (ƒ₃) were obtained by the GD model; the true diffusion coefficient (D) and perfusion fraction (f) were obtained by the IVIM model; and the apparent diffusion coefficient (ADC) was obtained by the ME model.

Results

ƒ₁ had a strongly negative

SUBMITTER: Chikui T 

PROVIDER: S-EPMC7860948 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature