2019
DOI: 10.1002/nbm.4159
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Diffusion tensor imaging of the abdominal organs: Influence of oriented intravoxel flow compartments

Abstract: Water flow in partially oriented intravoxel compartments mimics an anisotropic fast‐diffusion regime, which contributes to the signal attenuation in diffusion‐weighted images. In the abdominal organs, this flow may reflect physiological fluid movements (eg, tubular urine flow in kidneys, or bile flow through the liver) and have a clinical relevance. This study investigated the influence of anisotropic intravoxel water flow on diffusion tensor imaging (DTI) of the abdominal organs. Diffusion‐weighted images wer… Show more

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Cited by 7 publications
(8 citation statements)
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“…In addition, models that allow for carefully restricted While it is well known that anisotropic diffusion tensors are required to adequately capture water diffusion in the brain, the relevance of tensor-aware IVIM models in the brain (or in most other biological tissues) is less clear. Only a few studies have demonstrated evidence for anisotropic blood flow properties (e.g., in the renal medulla 15,16 or in the liver 7 ), and first preliminary evaluations have been published for the human brain. 17,47 A major challenge in the combined evaluation of conventional diffusion tensors and IVIM-related tensors is the large number of free parameters that must be fitted by such models.…”
Section: Discussionmentioning
confidence: 99%
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“…In addition, models that allow for carefully restricted While it is well known that anisotropic diffusion tensors are required to adequately capture water diffusion in the brain, the relevance of tensor-aware IVIM models in the brain (or in most other biological tissues) is less clear. Only a few studies have demonstrated evidence for anisotropic blood flow properties (e.g., in the renal medulla 15,16 or in the liver 7 ), and first preliminary evaluations have been published for the human brain. 17,47 A major challenge in the combined evaluation of conventional diffusion tensors and IVIM-related tensors is the large number of free parameters that must be fitted by such models.…”
Section: Discussionmentioning
confidence: 99%
“…While it is well known that anisotropic diffusion tensors are required to adequately capture water diffusion in the brain, the relevance of tensor‐aware IVIM models in the brain (or in most other biological tissues) is less clear. Only a few studies have demonstrated evidence for anisotropic blood flow properties (e.g., in the renal medulla 15,16 or in the liver 7 ), and first preliminary evaluations have been published for the human brain 17,47 …”
Section: Discussionmentioning
confidence: 99%
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“…These methods have been now applied broadly in renal function in both health and disease 6 and can supply robust biomarkers, but it is well known that each is only a partial description of the full signal behavior, and more advanced variants could be more representative. 7,[13][14][15][16][17][18] In that spirit, some hybrid methods jointly measure flow and structural anisotropy, [13][14][15]18 either assigning the flow anisotropy to the perfusion fraction, the pseudodiffusivity, or both. Furthermore, tubular and vascular flow both contribute to apparent perfusion fraction, and some studies have suggested that they can be resolved via the rate of pseudodiffusion with multicompartment analysis, including triexponential representations or full spectral measurement.…”
mentioning
confidence: 99%
“…Two important representations are diffusion tensor imaging (DTI), 9,10 which measures directional anisotropy of water motion, and intravoxel incoherent motion (IVIM), 11,12 which separately quantifies microcirculation and microstructural restriction. These methods have been now applied broadly in renal function in both health and disease 6 and can supply robust biomarkers, but it is well known that each is only a partial description of the full signal behavior, and more advanced variants could be more representative 7,13–18 …”
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confidence: 99%