نتایج جستجو برای: motion correction
تعداد نتایج: 374011 فیلتر نتایج به سال:
Variability in illumination, signal quality, tilt and the amount of motion pose challenges for post-processing based 3D-OCT motion correction algorithms. We present an advanced 3D-OCT motion correction algorithm using image registration and orthogonal raster scan patterns aimed at addressing these challenges. An intensity similarity measure using the pseudo Huber norm and a regularization schem...
Figure 2 – Reformatted images showing the main coronary arteries of two subjects. Subject 1: 2D Affine + translational motion correction gives superior image quality compared to both 2D translational correction and a gated scan (with ~3x reduction in scan time). Subject 2: 2D motion correction gives similar image quality to the gated scan with ~2x reduction in scan time. Affine correction shows...
Background As has been shown recently, the use of undersampled 3D projection reconstruction (3DPR) and image-based motion correction with 100% acquisition efficiency [1,2] enables highly accelerated coronary MRA (CMRA) with high isotropic resolution. However, streaking artifact from undersampling significantly reduces the apparent signal-to-noise ratio (SNR). Moreover, affine motion correction ...
Background Automated mage registration in cardiac myocardial perfusion is a necessity before quantitative perfusion can be widely accepted in clinical practice. Increasingly complex motion correction algorithms are being developed to deal with cardiac motion. However, the impact of these improvements has not been evaluated in terms of the final clinical diagnosis. Advanced motion correction met...
Introduction: Diffusion weighted imaging (DWI) has become indispensable in clinical routine, especially due to its sensitivity to early stages of brain ischemia. Patient motion during measurements is a major source of artifacts. A distinction must be made between motions during the acquisition of a single diffusion encoded image (intrascan) and movements in between these images (interscan) as w...
Introduction: In most fMRI studies, subject motion is assumed to be restricted to such a small amount that susceptibility-induced distortions can be treated as stationary and independent from motion. However, the ultimate goal of this project is to enable fMRI studies during significant head motion by applying prospective motion correction techniques [1]. In this regime, the motion dependence o...
Respiratory motion is known to degrade image quality in PET imaging. The necessary acquisition time of several minutes per bed position will inevitably lead to a blurring effect due to organ motion. A lot of research has been done with regards to motion correction of PET data. As full-body PET-MRI became available recently, the anatomical data provided by MRI is a promising source of motion inf...
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