Motion compensation is a crucial step to inverse synthetic aperture radar imaging, and envelope correction is the foundation of motion compensation. Research on envelope correction based on the small-angle imaging model has matured after years of development. However, the small-angle imaging model is not applicable to parameter estimation and imaging of micro-motion targets. According to the ch...

Fetal motion continues to be one of the major artifacts in in-utero functional MRI; interestingly few methods have been developed to address fetal motion correction. In this study, we propose a robust method for motion correction in fetal fMRI by which both inter-slice and inter-volume motion artifacts are jointly corrected. To accomplish this, an original volume is temporally split into odd an...

Motion-induced artifacts are much harder to recognize in magnetic resonance spectroscopic imaging than in imaging experiments and can therefore lead to erroneous interpretation. A method for prospective motion correction based on an optical tracking system has recently been proposed and has already been successfully applied to single voxel spectroscopy. In this work, the utility of prospective ...

INTRODUCTION For high resolution MRI of human brain, subject motion is a major problem which degrades the image quality. Real-time prospective correction (1) is a very promising solution. Based on the motion data, this method updates the coordinates of the imaging volume such that the position and orientation of the subject with respect to the imaging volume remain unchanged for every sequence ...

Respiratory motion customarily degrades the resolution of a routine hepatic scintigram. We have analyzed four analog motion-correction methods and have measured their abilities to maintain good spatial resolution over a broad range of liver scintigraphy parameters. The analog circuit described can maintain the spatial resolution of the scintillation camera within 2 mm of the full width at half ...

UNLABELLED Respiratory and cardiac motion is the most serious limitation to whole-body PET, resulting in spatial resolution close to 1 cm. Furthermore, motion-induced inconsistencies in the attenuation measurements often lead to significant artifacts in the reconstructed images. Gating can remove motion artifacts at the cost of increased noise. This paper presents an approach to respiratory mot...

Magnetic resonance imaging (MRI) is highly susceptible to subject’s motion and can significantly degrade image quality. In brain MRI exams, involuntary headmovements can affect the sampled k-space data. Such unintended alterations may result in visible image artifacts such as blurring, ghosting and others, and therefore potentially disqualify the image fromdiagnostic purposes. Methods to charac...

INTRODUCTION Artifacts caused by motion during the image acquisition are a well known problem at 1.5T and 3T. In high field systems such as 7T the available signal to noise ratio leads to potentially higher resolution than in systems with lower field. Unfortunately higher resolution requires longer acquisition times without patient motion. Therefore an increased need for motion correction exist...

INTRODUCTION Correction of rigid head motion correction is important in diffusion tensor imaging because of the long acquisition times. Rigid head correction can be carried out either retrospectively prospectively. In this study, we compared the effectiveness of these two approaches in correcting motion artifacts in DTI. Retrospective correction was based on MR-based navigator data (1-3), whils...