Symmetry of the fornix using diffusion tensor imaging. 2014

Uta N Sboto-Frankenstein, and Tiffany Lazar, and R Bruce Bolster, and Sunny Thind, and Patricia Dreessen de Gervai, and Marco L H Gruwel, and Stephen D Smith, and Boguslaw Tomanek
Alberta Innovates Technology Futures, MR Technology, Winnipeg, MB, Canada; Biopsychology Program Department of Psychology, University of Winnipeg, Winnipeg, MB, Canada; National Research Council Institute for Biodiagnostics, MR Technology, Winnipeg, MB, Canada.

OBJECTIVE To: 1) Present fornix tractography in its entirety for 20 healthy individuals to assess variability. 2) Provide individual and groupwise whole tract diffusion parameter symmetry assessments prior to clinical application. 3) Compare whole tract diffusion parameter assessments with tract-based spatial statistics (TBSS). METHODS Diffusion tensor imaging (DTI) data were acquired on a 3T Siemens magnetic resonance imaging (MRI) system using a single-shot spin echo planar imaging (EPI) sequence. Individual fornix tractography was conducted and whole tract diffusion parameter symmetries assessed. Whole tract results were compared with asymmetry contrasts conducted with voxelwise statistical analysis of diffusion parameters using TBSS. RESULTS The fornix tract could be visualized in its entirety including the columns, body, crura, and fimbria. Contrary to the crus and body, there were some tractography inconsistencies of the columns and fimbria across subjects. Although whole tract diffusion parameter asymmetries were nonsignificant, fractional anisotropy (FA) values bordered on statistical significance (P = 0.052). Using TBSS, significant FA asymmetries were identified (P ≤ 0.01, corrected). CONCLUSIONS The findings demonstrate consistency of fornix tractography as well as some variability in the columns and fimbria. While parametric assessment demonstrates diffusion parameter symmetry, permutation-based TBSS analysis reveals significant FA asymmetries in the crura and fimbriae.

UI MeSH Term Description Entries
D008297 Male Males
D009413 Nerve Fibers, Myelinated A class of nerve fibers as defined by their structure, specifically the nerve sheath arrangement. The AXONS of the myelinated nerve fibers are completely encased in a MYELIN SHEATH. They are fibers of relatively large and varied diameters. Their NEURAL CONDUCTION rates are faster than those of the unmyelinated nerve fibers (NERVE FIBERS, UNMYELINATED). Myelinated nerve fibers are present in somatic and autonomic nerves. A Fibers,B Fibers,Fiber, Myelinated Nerve,Fibers, Myelinated Nerve,Myelinated Nerve Fiber,Myelinated Nerve Fibers,Nerve Fiber, Myelinated
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D012680 Sensitivity and Specificity Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed) Specificity,Sensitivity,Specificity and Sensitivity
D015203 Reproducibility of Results The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results. Reliability and Validity,Reliability of Result,Reproducibility Of Result,Reproducibility of Finding,Validity of Result,Validity of Results,Face Validity,Reliability (Epidemiology),Reliability of Results,Reproducibility of Findings,Test-Retest Reliability,Validity (Epidemiology),Finding Reproducibilities,Finding Reproducibility,Of Result, Reproducibility,Of Results, Reproducibility,Reliabilities, Test-Retest,Reliability, Test-Retest,Result Reliabilities,Result Reliability,Result Validities,Result Validity,Result, Reproducibility Of,Results, Reproducibility Of,Test Retest Reliability,Validity and Reliability,Validity, Face
D055815 Young Adult A person between 19 and 24 years of age. Adult, Young,Adults, Young,Young Adults
D056324 Diffusion Tensor Imaging The use of diffusion ANISOTROPY data from diffusion magnetic resonance imaging results to construct images based on the direction of the faster diffusing molecules. Diffusion Tractography,DTI MRI,Diffusion Tensor MRI,Diffusion Tensor Magnetic Resonance Imaging,Diffusion Tensor MRIs,Imaging, Diffusion Tensor,MRI, Diffusion Tensor,Tractography, Diffusion
D020712 Fornix, Brain Heavily myelinated fiber bundle of the TELENCEPHALON projecting from the hippocampal formation to the HYPOTHALAMUS. Some authorities consider the fornix part of the LIMBIC SYSTEM. The fimbria starts as a flattened band of axons arising from the subiculum and HIPPOCAMPUS, which then thickens to form the fornix. Fimbria, Brain,Commissura Hippocampi,Commissure of Fornix,Dorsal Hippocampal Commissure,Fimbria (Brain),Fimbria of Hippocampus,Fimbria-Fornix,Fornical Commissure,Fornix (Brain),Fornix-Fimbria,Hippocampal Commissure,Brain Fimbria,Brain Fimbrias,Brain Fornices,Brain Fornix,Commissura Hippocampus,Commissure, Dorsal Hippocampal,Commissure, Fornical,Commissure, Hippocampal,Commissures, Dorsal Hippocampal,Commissures, Fornical,Commissures, Hippocampal,Dorsal Hippocampal Commissures,Fimbria Fornix,Fimbria-Fornices,Fimbrias (Brain),Fimbrias, Brain,Fornical Commissures,Fornices (Brain),Fornices, Brain,Fornix Commissure,Fornix Commissures,Fornix Fimbria,Fornix-Fimbrias,Hippocampal Commissure, Dorsal,Hippocampal Commissures,Hippocampal Commissures, Dorsal,Hippocampi, Commissura,Hippocampus Fimbria,Hippocampus Fimbrias,Hippocampus, Commissura

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