Spiral imaging does not produce apparent flow artifacts. However, it remains sensitive to rapid rigid body motion. In this abstract, a motion correction technique using an orbital navigator “ring” in interleaved spiral imaging is presented. In this technique, a circular k-space trajectory is incorporated into each spiral interleaf. Data inconsistency due to both rotation and translation can be ...

Head motions during functional magnetic resonance imaging (fMRI) impair fMRI data quality and introduce systematic artifacts that can affect interpretation of fMRI results. Electroencephalography (EEG) recordings performed simultaneously with fMRI provide high-temporal-resolution information about ongoing brain activity as well as head movements. Recently, an EEG-assisted retrospective motion c...

PURPOSE Diffusion contrast in diffusion-weighted steady-state free precession magnetic resonance imaging (MRI) is generated through the constructive addition of signal from many coherence pathways. Motion-induced phase causes destructive interference which results in loss of signal magnitude and diffusion contrast. In this work, a three-dimensional (3D) navigator-based real-time correction of t...

Prospective motion correction methods using an optical system, diffusion-weighted prospective acquisition correction, or a free induction decay navigator have recently been applied to correct for motion in diffusion tensor imaging. These methods have some limitations and drawbacks. This article describes a novel technique using a three-dimensional-echo planar imaging navigator, of which the con...

INSERM UMR1101, LaTIM, Brest, France Respiratory motion in PET/MR imaging leads to reduced quantitative and qualitative image accuracy. Correction methodologies include the use of respiratory synchronized gated frames which lead to low signal to noise ratio (SNR) given that each frame contains only part of the count available throughout an average PET acquisition. In this work, 4D MRI extracted...

Patient motion during myocardial SPECT profusion imaging may result in the formation of artifacts in the reconstructed images. This study attempts to present a method on the basis of modeling image frames through optimum-degree polynomial curves and fitting 2D curves to detect and correct heart motion at pixel and subpixel accuracy. To evaluate our method, NCAT phantom was shifted during data a...

UNLABELLED Several studies have described nonuniform blurring of myocardial perfusion imaging (MPI) due to respiration. This article describes a technique for correcting the respiration effect and assesses its effectiveness in clinical studies. METHODS Simulated phantoms, physical phantoms, and patient scans were used in this study. A heart phantom, which oscillated back and forth, was used t...

Introduction Recent developments in partially parallel imaging (PPI) techniques provide new opportunities for motion artifact reduction [1-2]. One PPI technique that exhibits great potentials in many motion detection and correction scenarios is the GRAPPA operator [3], as the GRAPPA kernels can be flexibly positioned for k-space interpolation and extrapolation in any direction. This work propos...

Background Diffusion cardiac imaging has been challenging due to respiratory and heart motion. Recent developments in cardiac diffusion imaging proposed more robust spin echoes encoding scheme, like Acceleration Motion Correction(AMC)(1), to tackle cardiac motion. In addition, free breathing acquisition with prospective motion correction like slice following technique (2) has been shown to redu...