Svensson, Johanna [WorldCat Identities]

Utvärdering Av Histologisk Differentiering Av Hepatit B

doi: 10.1148/radiol.13122712. Epub 2013 Oct 28. Intravoxel incoherent motion diffusion-weighted MR imaging for characterization of focal pancreatic lesions. BACKGROUND AND PURPOSE: Despite a recent resurgence, intravoxel incoherent motion MRI faces practical challenges, including limited SNR and demanding acquisition and postprocessing requirements. A simplified approach using linear fitting of a subset of higher b-values has seen success in other organ systems. We sought to validate this method for evaluation of brain pathology by comparing Purpose .

2016-07-07 · Objective Intravoxel incoherent motion (IVIM) is an MRI technique with potential applications in measuring brain tumor perfusion, but its clinical impact remains to be determined. We assessed the usefulness of IVIM-metrics in predicting survival in newly diagnosed glioblastoma. Methods Fifteen patients with glioblastoma underwent MRI including spin-echo echo-planar DWI using 13 b-values 2018-11-05 · Intravoxel incoherent motion (IVIM) refers to translational movements which within a given voxel and during the measurement time present a distribution of speeds in orientation and/or amplitude. The concept was introduced in 1986 together with the foundation of diffusion MRI because it had been realized that flow of blood in capillaries (perfusion) would mimic a diffusion process and impact 2019-02-06 · Intravoxel incoherent motion (IVIM) imaging is a magnetic resonance imaging (MRI) technique widely used in clinical applications for various organs.

Intravoxel incoherent motion modeling - Optimization - GUPEA

Intravoxel Incoherent Motion Imaging of Tumor Microenvironment in Locally Advanced Breast Cancer - PubMed Diffusion-weighted imaging plays important roles in cancer diagnosis, monitoring, and treatment. Abstract Purpose: To systematically analyze intravoxel incoherent motion (IVIM) MRI in a perfusable capillary phantom closely matching the geometry of capillary beds in vivo and to compare the validity of the biexponential pseudo-diffusion and the recently introduced phase-distribution IVIM model. At very low diffusion weighting the diffusion MRI signal is affected by intravoxel incoherent motion (IVIM) caused by dephasing of magnetization due to incoherent blood flow in capillaries or other sources of microcirculation.

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Biexponential fits were applied to the diffusion decay curves to … Intravoxel incoherent motion imaging was performed on a 3 T magnetic resonance imaging scanner using 15 b values (0–800 s/mm 2) for 4 phantoms with different area fractions of the flowing water compartment (FWC%), at the infusion flow rates of 0, 1, 2, and 3 mL/min. Images were quantitatively analyzed using monoexponential free biexponential, and segmented biexponential fitting models. Intravoxel incoherent motion (IVIM) allows the separation of perfusion and molecular-based diffusion coefficients [14]. By fitti-b DWI ng multiple data with a biexponential model, three parameters can be obtained from IVIM, including the true diffusion coefficient (D value), perfusion-related pseudodiffusion coefficient (D* value), and perfusion intravoxel dephasing: ( in'tră-voks'ĕl dē-fāz'ing ) Phase difference between flow and stationary nuclei in a voxel. ivim_tools ----- This software package provides the necessary MATLAB scripts, phase distributions and data sets to reproduce the figures in the manuscript "Flow compensated IVIM imaging" by A. Wetscherek, B. Stieltjes and F. B. Laun. 2016-02-10 techniques using diffusion, intravoxel incoherent motion (IVIM) DW-MRI have been employed with increasing frequency in the clinic to evaluate tissue perfusion without the use of contrast agents.

MRI hardware developments have resulted in Nyckelord [en].
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The D and PP values were Diffusion and Intravoxel Incoherent Motion MR Imaging–based Virtual Elastography: A Hypothesis-generating Study in the Liver. Denis Le Bihan, Shintaro Ichikawa, Utaroh Motosugi; Denis Le Bihan , Shintaro Ichikawa, Utaroh Motosugi 2019-12-24 · Currently, little is known regarding the value of quantitative parameters derived from the intravoxel incoherent motion (IVIM) magnetic resonance imaging (MRI) with integrated slice-specific Intravoxel incoherent motion diffusion weighted imaging (IVIM-DWI), with a bi-exponential model, can not only observe the diffusion of tissue water molecules but also reflect the blood perfusion information of tissue microcirculation, compensating for the deficiencies of conventional DWI [15] . Multiparametric intravoxel incoherent motion (IVIM) provides diffusion and perfusion information for the treatment prediction of cancer. However, the superiority of IVIM over dynamic contrast‐enhanced (DCE) magnetic resonance imaging (MRI) in locally advanced hypopharyngeal carcinoma (LAHC) remains unclear.

in 1986 , separates microcirculation perfusion and water molecule diffusion by using a biexponential model [22, 25, 26].
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Collapsed cone dose calculations for heterogeneous tissues

As both intravoxel incoherent motion (IVIM) modeling and dynamic contrast‐enhanced magnetic resonance imaging (DCE‐MRI) provide perfusion parameters, IVIM‐derived perfusion parameters might be expected to correlate with the kinetic features from DCE‐MRI. Se hela listan på academic.oup.com Intravoxel incoherent motion imaging was performed on a 3 T magnetic resonance imaging scanner using 15 b values (0–800 s/mm 2) for 4 phantoms with different area fractions of the flowing water compartment (FWC%), at the infusion flow rates of 0, 1, 2, and 3 mL/min. Images were quantitatively analyzed using monoexponential free biexponential, and segmented biexponential fitting models. Background To compare different fitting methods for determining IVIM (Intravoxel Incoherent Motion) parameters and to determine whether the use of different IVIM fitting methods would affect differentiation of cervix cancer from normal cervix tissue. Methods Diffusion-weighted echo-planar imaging of 30 subjects was performed on a 3.0 T scanner with b-values of 0, 30, 100, 200, 400, 1000 s/mm2 27.