Geometric Distortion Correction of Renal Diffusion Tensor Imaging Using the Reversed Gradient Method
نویسندگان
چکیده
منابع مشابه
Correction of geometric distortion in Propeller echo planar imaging using a modified reversed gradient approach.
OBJECTIVE This study investigates the application of a modified reversed gradient algorithm to the Propeller-EPI imaging method (periodically rotated overlapping parallel lines with enhanced reconstruction based on echo-planar imaging readout) for corrections of geometric distortions due to the EPI readout. MATERIALS AND METHODS Propeller-EPI acquisition was executed with 360-degree rotationa...
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Introduction Diffusion weighted single shot spin-echo planer imaging (DW-EPI) is commonly used for diffusion tensor imaging (DTI). DW-EPI is very sensitive to static magnetic field (B0) inhomogeneities (such as that near air-tissue boundary) that produce geometric distortion, primarily along the phase-encoding direction. As a result, artifacts are severe in the frontal and temporal lobes due to...
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EPIs (I-IIa), corresponding FA maps without (I-IIb), with eddy-correction (I-IIc and I-IId) and the final FA maps with comprehensive distortion correction (III): For comparison, eddy correction was performed with the proposed calibration method (c) and FSL (d) and the results were compared with an reference image without distortion (IIIa). To verify the correction quality more easily, the enlar...
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This paper presents a new procedure to estimate the diffusion tensor from a sequence of diffusion-weighted images. The first step of this procedure consists of the correction of the distortions usually induced by eddy-current related to the large diffusion-sensitizing gradients. This correction algorithm relies on the maximization of mutual information to estimate the three parameters of a geom...
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In echo-planar imaging (EPI), such as commonly used for functional MRI (fMRI) and diffusion-tensor imaging (DTI), compressed distortion is a more difficult challenge than local stretching as spatial information can be lost in strongly compressed areas. In addition, the effects are more severe at ultra-high field (UHF) such as 7T due to increased field inhomogeneity. To resolve this problem, two...
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ژورنال
عنوان ژورنال: Journal of Computer Assisted Tomography
سال: 2021
ISSN: 1532-3145,0363-8715
DOI: 10.1097/rct.0000000000001124