Abbreviated quantitative UTE imaging in anterior cruciate ligament reconstruction

Figures

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  Fig. 1. \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {T}_{2s}^{\ast } $$\end{document}T2s∗ and fbw estimation bias over a range of values clinically relevant for ACL grafts. The proposed baseline-corrected mono-exponential model for short T2* component evaluation was used for estimation of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {T}_{2s}^{\ast } $$\end{document}T2s∗ (c) and fbw (d). The bias compares the estimated values of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {T}_{2s, app}^{\ast } $$\end{document}T2s,app∗ (a) and fbw, app (b) to the simulated values of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym}…

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  Fig. 2. \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {T}_{2s}^{\ast } $$\end{document}T2s∗ and fbw estimation bias over a large range of fbw values. The proposed baseline-corrected mono-exponential model for short T2* component evaluation was used for estimation of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {T}_{2s}^{\ast } $$\end{document}T2s∗ (c) and fbw (d). The bias compares the estimated values of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {T}_{2s, app}^{\ast } $$\end{document}T2s,app∗ (a) and fbw, app (b) to the simulated values of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts}…

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  Fig. 3. UTE images and signal fitting at TE of 0.1 ms (a) and 4 ms (b), corresponding signal decay with bi-exponential model fitting (blue lines) and baseline-corrected mono-exponential model fitting (red lines) for the ACL (c) and patellar tendon (d) for a healthy subject

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  Fig. 4. UTE images at the 6 imaged TEs (a) and the corresponding signal decay profile with baseline-corrected mono-exponential fitting from the intra-articular graft region (b) for a representative ACL reconstruction subject. Note that the TE2 images are scaled by a factor of 1.2 for display purposes

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  Fig. 5. Sagittal and axial UTE image with TE of 4 ms for a representative ACL reconstruction subject. The left column shows the images in the sagittal plane and the right column shows images from the axial planes denoted by the yellow lines in the sagittal plane images. The red lines delineate the ACL graft. The first row depicts the femoral intra-bone graft and graft/bone interface, the second row depicts the intra-articular graft, and the third row depicts the tibial intra-bone graft and graft/bone interface. The outlines of the ACL graft on the sagittal plane images have been shrunk by 2 voxels for illustration purposes. The ACL graft outlines on the axial plane images were not shrunk by 2 voxels. The ACL graft outlines on the axial plane images of the femoral and tibial graft tunnels are thicker than the ACL graft outlines on the axial plane image of the intra-articular graft because they include the graft/bone interface (outer 2 voxels)

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  Fig. 6. Regions of interest for a typical ACL reconstruction subject overlaid on the UTE image with TE of 4 ms. ROIs are color coded as follows: orange, femoral graft/bone interface; red, femoral intra-bone graft; yellow, intra-articular graft; green, tibial intra-bone; blue, tibial graft/bone interface

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  Fig. 7. Ladder plots of the \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {T}_{2s}^{\ast } $$\end{document}T2s∗, fbw, and angle relative to B0 from 8 ACL reconstruction subjects at 3- and 6-months post-ACL reconstruction surgery