Journal ArticleDOI
Free-breathing whole-heart coronary MRA with 3D radial SSFP and self-navigated image reconstruction.
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TLDR
A self‐navigated, free‐breathing, whole‐heart 3D coronary MRI technique that would overcome shortcomings and improve the ease‐of‐use of coronary MRI is developed and implemented.Abstract:
Respiratory motion is a major source of artifacts in cardiac magnetic resonance imaging (MRI). Free-breathing techniques with pencil-beam navigators efficiently suppress respiratory motion and minimize the need for patient cooperation. However, the correlation between the measured navigator position and the actual position of the heart may be adversely affected by hysteretic effects, navigator position, and temporal delays between the navigators and the image acquisition. In addition, irregular breathing patterns during navigator-gated scanning may result in low scan efficiency and prolonged scan time. The purpose of this study was to develop and implement a self-navigated, free-breathing, whole-heart 3D coronary MRI technique that would overcome these shortcomings and improve the ease-of-use of coronary MRI. A signal synchronous with respiration was extracted directly from the echoes acquired for imaging, and the motion information was used for retrospective, rigid-body, through-plane motion correction. The images obtained from the self-navigated reconstruction were compared with the results from conventional, prospective, pencil-beam navigator tracking. Image quality was improved in phantom studies using self-navigation, while equivalent results were obtained with both techniques in preliminary in vivo studies.read more
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Journal ArticleDOI
4D flow MRI
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Journal ArticleDOI
Respiratory motion models: a review.
Jamie R. McClelland,David J. Hawkes,Tobias Schaeffter,Tobias Schaeffter,Andrew P. King,Andrew P. King +5 more
TL;DR: The state of the art in this important field of respiratory motion modelling is summarized and in the process the key papers that have driven its advance are highlighted.
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Journal ArticleDOI
Motion in cardiovascular MR imaging.
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In vivo MRI cell tracking using perfluorocarbon probes and fluorine-19 detection.
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References
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Journal ArticleDOI
Motion correction with PROPELLER MRI: application to head motion and free-breathing cardiac imaging.
TL;DR: Results are shown in which PROPELLER MRI is used to correct for bulk motion in head images and respiratory motion in nongated cardiac images.
Journal ArticleDOI
Adaptive technique for high-definition MR imaging of moving structures.
Richard L. Ehman,Joel P. Felmlee +1 more
TL;DR: An adaptive technique for measuring and correcting the effects of patient motion during magnetic resonance image acquisition was developed and tested and shows promise for addressing the problem of respiratory motion in thoracoabdominal imaging.
Journal ArticleDOI
Projection reconstruction techniques for reduction of motion effects in MRI.
Gary H. Glover,John M. Pauly +1 more
TL;DR: Projection reconstruction techniques are shown to have intrinsic advantages over spin‐warp methods with respect to diminished artifacts from respiratory motion, and respiratory‐ordered view angle (ROVA) acquisition is found to diminish residual streaking significantly by reducing interview inconsistencies.
Journal ArticleDOI
Respiratory motion of the heart: kinematics and the implications for the spatial resolution in coronary imaging
TL;DR: It was found that during tidal breathing the movement of the heart due to respiration is dominated by superior‐inferior (SI) motion, which is linearly related to the SI motion of the diaphragm.
Journal ArticleDOI
Self-gated cardiac cine MRI
Andrew C. Larson,Richard D. White,Gerhard Laub,Gerhard Laub,Elliot R. McVeigh,Debiao Li,Orlando P. Simonetti,Orlando P. Simonetti +7 more
TL;DR: New “self‐gated” (SG) acquisition technique is developed that enables the acquisition of high temporal and spatial resolution cardiac cine images without the need for ECG gating and with no loss in imaging efficiency.
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