Non-parametric intravoxel incoherent motion analysis in patients with intracranial lesions: Test-retest reliability and correlation with arterial spin labeling

NeuroImage: Clinical

Tobias Weiss¹  Matthias Guckenberger²  Oliver Riesterer²  Sonja Stieb²  Moritz C. Wurnig³  Cristina Rossi³  Andreas Boss³  Pinar S. Özbay³ 

[1] Department of Neurology, University Hospital Zurich and University of Zurich, Switzerland;Department of Radiation Oncology, University Hospital Zurich and University of Zurich, Switzerland;Institute of Diagnostic and Interventional Radiology, University Hospital Zurich and University of Zurich, Switzerland;

关键词: Intravoxel incoherent motion;    IVIM;    Arterial spin labeling;    ASL;    Test-retest reliability;    Glioblastoma multiforme;   

DOI  :  10.1016/j.nicl.2016.05.022

来源: DOAJ

【 摘 要 】

Intravoxel incoherent motion (IVIM) analysis of diffusion imaging data provides biomarkers of true passive water diffusion and perfusion properties. A new IVIM algorithm with variable adjustment of the b-value threshold separating diffusion and perfusion effects was applied for cerebral tissue characterization in healthy volunteers, computation of test-retest reliability, correlation with arterial spin labeling, and assessment of applicability in a small cohort of patients with malignant intracranial masses. The main results of this study are threefold: (i) accounting for regional differences in the separation of the perfusion and the diffusion components improves the reliability of the model parameters; (ii) if differences in the b-value threshold are not accounted for, a significant tissue-dependent systematic bias of the IVIM parameters occurs; (iii) accounting for voxel-wise differences in the b-value threshold improves the correlation with CBF measurements in healthy volunteers and patients. The proposed algorithm provides a robust characterization of regional micro-vascularization and cellularity without a priori assumptions on tissue diffusion properties. The glioblastoma multiforme with its inherently high variability of tumor vascularization and tumor cell density may benefit from a non-invasive clinical characterization of diffusion and perfusion properties.

【 授权许可】

Unknown