20 research outputs found

    Optimal order quantities with remanufacturing across new product generations

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    <p>Full dataset (384 slices) of the<br>highest resolution 3D MPRAGE scan (shown in Fig. 7).</p

    Experimental setup for motion tracking during the MRI measurements.

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    <p>The tracking systems CLU was mounted on the inner cover inside the magnet bore. The MPT marker was presented at a distance of ≈ 11–14 cm from the camera on the extension of the dental brace reaching out of the 32-channel helmet-design head coil.</p

    Dental brace and MPT marker.

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    <p>An individually manufactured dental brace (A) was worn by the subject during the measurement. A passive marker similar to the one shown in (B) was mounted on the brace’s extension reaching out of the helmet-design head coil. Planar grating patterns were printed on both sites of a transparent substrate forming moiré patterns. The retro reflective background of the marker ensured visibility to the camera and lighting unit (CLU) at low light exposure levels.</p

    One slice of the highest resolution MPRAGE scan.

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    <p>Note the sharpness in small structures such as vessels and the folia in the cerebellum in this 0.44 mm isotropic 3D MPRAGE data. Magnifications of the marked regions are shown below. See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0133921#pone.0133921.s002" target="_blank">S2 Video</a> for full data set.</p

    GRE comparison scans.

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    <p>0.25 Ă— 0.25 Ă— 2 mm gradient echo with motion correction off (A) and on (B) and magnifications of the marked regions.</p

    In vivo MRI scans: amount of motion during the scans.

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    <p>Standard deviation and absolute range of the X-, Y- and Z- translations and rotations measured by the tracking system for all in vivo scans.</p><p>In vivo MRI scans: amount of motion during the scans.</p

    MPRAGE comparison scans.

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    <p>0.44 mm isotropic 3D MPRAGE with motion correction off (A) and on (B) and magnifications of the marked regions. The plot shows the signal intensity profile of the line marked in the magnifications. Image-degrading effects caused by motion artifacts include noise amplification and creation of bogus structures e.g. doubled borders (a), blurring of structures such as flattening of signal intensity gradients (b) and plateaus (c).</p

    In vivo MRI scans: scan parameters.

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    <p>Scan parameters for the GRE and MPRAGE comparison scans with and without motion correction and for the highest resolution GRE, MPRAGE and ToF scans with motion correction.</p><p>In vivo MRI scans: scan parameters.</p

    One slice of the highest resolution GRE scan.

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    <p>At a resolution of 0.12 Ă— 0.12 Ă— 0.6 mm structures of one to two pixel in width are identifiable and clearly defined. Magnifications of the marked regions are shown below. See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0133921#pone.0133921.s001" target="_blank">S1 Video</a> for full data set.</p
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