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MultiVane k-space sampling method corrects for motion

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Welch, Brian Philips Healthcare

MultiVane employs an in-plane motion correction strategy that uses a novel MR signal sampling trajectory in k-space.

"MultiVane is a non-cartesian technique that oversamples the centers of k-space using separate cartesian vanes," says VUIIS-based Philips clinical scientist Brian Welch, who worked on MultiVane implementation. "Each vane contains k-space samples corresponding to the same low resolution image. If in-plane motion occurs, the low resolution images will move vane-to-vane.


Registering the low resolution images from each vane allows detection of in-plane motion - such as nodding or shaking the head - and correction of the individual vanes," Dr. Welch continues. "MultiVane is particularly well-designed because an individual vane is a Cartesian data set, which enables easier correction than with radial or spiral sampling schemes that are vulnerable to phase differences and off-resonance effects. All vanes are ultimately combined to create a single high resolution image that is sharp and artifact-free. If the low resolution image from a specific vane correlates poorly with other vanes, it is eliminated or underweighted during reconstruction."


Graphic depiction of MultiVane k-space data acquisition.

Data are acquired in a series of rotating vanes (single vane

is shaded), each of which collects data from a central area

of k-space. Each vane contains several phaseencoding lines.



MR protocols that collect many k-space lines in multiple snapshots, such as TSE or TFE, are best suited for MultiVane, because each vane can then be a quick snapshot that freezes the subject's motion. However, MultiVane can be combined with any sequence that is normally collected by a Cartesian trajectory, he explains.



Without MultiVane With MultiVane
Without MultiVane
With MultiVane


MultiVane is a strong competitor to other Cartesian motion correction strategies in its robust motion correction. If motion is occurring, Cartesian images will contain artifacts (primarly ghosts) that cannot be removed except through time-consuming iterative techniques or with the aid of fiducial markers or navigator echoes that must be acquired in addition to imaging to provide information about the motion. Furthermore, any residual motion inconsistencies in a MultiVane reconstruction will result in slight blurring, instead of distinct ghosts that may diminish the diagnostic utility of the images.


"MultiVane is elegant because the imaging data itself acts as a '2D navigator' - that is, the low resolution images contained within each blade," he observes. "The drawback is that the MultiVane trajectory is somewhat longer than the Cartesian equivalent. However, the literature shows that MultiVane can truly provide diagnostic quality images when Cartesian can't."


For more on VUIIS (Vanderbilt University Institute of Imaging Science), see:

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Sep 4, 2007

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