Philips is committed to driving clinical performance by providing premium image quality. Our goal
is to consistently deliver diagnostic information in an efficient time slot. MultiVane XD is one of
the pillars this builds on; it provides superb motion-free imaging by using robust motion correction.
It can be combined with dS SENSE for a high-speed exam.
MultiVane data collection in k-space
The Philips MultiVane technique has been in use for some years and
has now found an improved successor in MultiVane XD. In MultiVane,
data are collected in concentric rectangular blades rotated around the
k-space origin. The central region of k-space is sampled for every blade,
so the center of k-space is oversampled.
At the heart of MultiVane XD is an extended reconstruction algorithm1.
It contains a smart way of analyzing and correcting blades such that image
distortions due to both translational and rotational components of rigid
body motion are removed. Additionally, the k-space center of blades
corrupted with through-plane motion is removed to further decrease
motion artifacts.
MultiVane XD can be combined with dS SENSE in all directions to increase acquisition speeds.
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MultiVane | MultiVane XD |
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MultiVane XD image quality was tested in a study at Barrow
Neurological Institute using Ingenia 3.0T [1]. In 99% of image comparisons
in volunteers with no motion, small motion or moderate motion,
the MultiVane XD image was rated equal to or better than the standard
MultiVane image.
In addition to T2W-TSE, FLAIR and T1-FLAIR protocols that were already
available with MultiVane, T2*-FFE imaging is now enabled by MultiVane XD.
MultiVane XD protocols are available for several anatomies.
With the extended algorithm [1], the gross motion correction is more robust. It can be switched on in the Motion tab. It is recommended to use minimum or small WFS to prevent water/fat displacement in combination with MultiVane XD.
Comparison between normal Cartesian imaging
and MultiVane XD in a volunteer moving his head
clearly shows the high quality motion correction of
MultiVane XD in these Ingenia 1.5T FFE images.
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Cartesian | MultiVane XD
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dS SENSE factor 2.5 | dS SENSE factor 3
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Ingenia 3.0T. These two images are courtesy of Barrows Neurological
Imaging, Phoenix, Arizona, USA.
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Standard TSE | MultiVane XD |
Standard TSE was done with dS SENSE factor 1.5, scan time 1:18 min.
The MultiVane XD
scan was done with dS SENSE factor 2, scan time 1:24 min.
Ingenia 3.0T.
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Coronal MultiVane XD |
Coronal MultiVane XD.
Ingenia 3.0T, dS SENSE factor 2, scan time 1:36 min.
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Also in liver imaging, MultiVane XD provides excellent image
quality for both T2-weighted and fat suppressed imaging. It is
compatible with use of dS SENSE parallel imaging, which helps
to accelerate MultiVane XD scans.
MultiVane XD for liver imaging is available on 1.5T and 3.0T
systems with dStream digital imaging. Robust protocols are
available on these systems.
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T2W MultiVane XD on Ingenia 1.5T.
Voxels 1.0 x 1.0 x 5.0 mm
dS SENSE factor 2
scan time 2:36 min
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MultiVane with dS SENSE to shorten scan time
This Ingenia 3.0T example compares
MultiVane XD with dS SENSE to MultiVane
without SENSE with the same voxel sizes to
illustrate that the MultiVane XD scan is faster
and overall image quality is better.
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Without SENSE, scan time 4:33 min. | SENSE factor 2, scan time 3:30 min. |
T2W TSE MultiVane
Voxels 1.1 x 1.1 x 5.0 mm
| T2W TSE MultiVane XD
Voxels 1.1 x 1.1 x 5.0 mm
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T2W TSE Single shot | T2W TSE fast MultiVane XD |
Voxels 1.4 x 1.6 x 6.0 mm
SENSE factor 2, scan time 1:45 min.
| Voxels 1.5 x 1.5 x 5.0 mm
SENSE factor 2, scan time 1:03 min.
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In this example, the Ingenia 1.5T MultiVane XD
scan is faster and shows better image quality
and resolution than the single shot scan of the
same patient.
Summary
MultiVane XD provides robust motion correction.
It can be combined with dS SENSE for a high speed exam.
1. Pipe JG, Gibbs WN, Li Z, Karis JP, Schar M, Zwart NR
Revised motion estimation algorithm for PROPELLER MRI
Magn Reson Med. 2013 Sep 4. doi: 10.1002/mrm.24929 (Epub ahead of print)
