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...

Due to the long imaging times in SPECT, patient motion is inevitable and constitutes a serious problem for any reconstruction algorithm. The measured inconsistent projection data lead to reconstruction artifacts which can significantly affect the diagnostic accuracy of SPECT if not corrected. Among the most promising attempts for addressing this cause of artifacts is the so-called data-driven m...

OBJECTIVE To compare the breathing effects on dynamic contrast-enhanced (DCE)-MRI between controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA)-volumetric interpolated breath-hold examination (VIBE), radial VIBE with k-space-weighted image contrast view-sharing (radial-VIBE), and conventional VIBE (c-VIBE) sequences using a dedicated phantom experiment. MATERIALS...

UNLABELLED Patient motion during myocardial perfusion SPECT can produce images that show artifactual perfusion defects. The relationship between the degree of motion and the extent of artifactual perfusion defects is not clear for either single- or double-head detectors. Using both single- and double-head detectors and quantitative perfusion SPECT (QPS) software, we studied the pattern and exte...

Patient motion during myocardial perfusion SPECT can produce images that show artifactual perfusion defects. The relationship between the degree of motion and the extent of artifactual perfusion defects is not clear for either singleor double-head detectors. Using both singleand double-head detectors and quantitative perfusion SPECT (QPS) software, we studied the pattern and extent of defects i...

Introduction: Three dimensional (3D) scans are susceptible to motion artifacts because scan times are often long even after acceleration with parallel imaging and because any motion affects the entire volume measurement. Prospective motion correction techniques that directly estimate rigid body motion parameters with the help of navigators and adjust scan coordinates to realign with the subject...

PURPOSE We suggest a motion correction concept that employs free-induction-decay (FID) navigator signals to continuously monitor motion and to guide the acquisition of image navigators for prospective motion correction following motion detection. METHODS Motion causes out-of-range signal changes in FID time series that, and in this approach, initiate the acquisition of an image navigator. Co-...