منابع مشابه
Sources of distortion in functional MRI data.
Functional magnetic resonance image (fMRI) experiments rely on the ability to detect subtle signal changes in magnetic resonance image time series. Any areas of signal change that correlate with the neurological stimulus can then be identified and compared with a corresponding high-resolution anatomical scan. This report reviews some of the several artefacts that are frequently present in fMRI ...
متن کاملAssessment of Reproducibility of Geometric Distortion in MRI using Phantom Measurements
Introduction: Image distortion is one of the major problems of magnetic resonance imaging (MRI) for use in 3DMRI, velocity MRI, FMRI and radiotherapy treatment planning (RTTP). It is widely known that the most obvious effect of the inhomogenity of the magnetic fields and the nonlinearity of the gradient is the Geometric Distortion of MR tomograms. In this study, the...
متن کاملDistortion Correction Method for Single Echo DTI at 7T MRI using Non-distortion and Distortion Dimension Combined PSF Mapping Technique
S-H. Oh, J-Y. Chung, S-Y. Park, D. Kim, M-H. In, M. Zaitsev, O. Speck, Y-B. Kim, and Z-H. Cho Neuroscience Research Institute, Gachon University of Medicine and Science, Incheon, Incheon, Korea, Republic of, Department of Electrical Engineering, Korea Advance Institute of Science and Technology, Daejeon, Daejeon, Korea, Republic of, Department of Biomedical Magnetic Resonance, Institute for Exp...
متن کاملComparison of EPI Distortion Correction Methods in Diffusion Tensor MRI
Introduction Diffusion weighted images (DWIs) used for Diffusion Tensor (DT) calculation are commonly acquired with Echo-planar imaging (EPI). Unfortunately, EPI is very sensitive to magnetic field (B0 ) inhomogeneities, which result in local geometric distortions in regions close to air-tissue interfaces. These distortions degrade the anatomical accuracy of DT-MRI maps and potentially increase...
متن کاملDistortion of normal pituitary structures in sellar pathologies on MRI.
OBJECTIVE This study was undertaken to assess the displacement patterns and shifts of the normal pituitary gland in sellar pathologies on MRI and to determine if the position of the bright spot (BS) represents a predicting factor for the position of the residual adenohypophysis (RAH) in pathological conditions. METHODS In a control group of 102 patients without any pituitary pathology, the pr...
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ژورنال
عنوان ژورنال: British Journal of Anaesthesia
سال: 1994
ISSN: 0007-0912
DOI: 10.1093/bja/72.6.727-b