An MRI derived articular cartilage visualization framework

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Presentation transcript:

An MRI derived articular cartilage visualization framework S. Akhtar, M.B.B.Ch., C.L. Poh, Ph.D., R.I. Kitney, D.Sc. (Eng), Ph.D. Osteoarthritis and Cartilage Volume 15, Issue 9, Pages 1070-1085 (September 2007) DOI: 10.1016/j.joca.2007.03.009 Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 An illustration of different means of measuring cartilage thickness. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 A flow diagram indicating the development of our methodology and the scope of this paper. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 Important anatomical features in a sagittal knee MR image (a 3D SPGR image). Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 4 A segmented cartilage image showing the positions of the corresponding inner and outer edge coordinates used to determine the thickness at a particular position on the cartilage. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 5 The color scheme that was employed. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 6 3D WearMap and Bonemesh. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 7 Showing the relationship between the segmented imaged volume and the matrix array that allows production of the 2D WearMaps. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 8 A schematic diagram indicating the relationship between a point selected on the 2D WearMap and its position on the 3D WearMap via anti-morphing that (a) relates directly to its position on the original MR image and (b) is exploited for TrackBack. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 9 Diagram indicating how measurements between the two selected points (yellow stars) can be made by not considering (a) and by considering (b) the cartilage contour where dr is the distance between successive points sampled. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 10 From left to right-characteristic sagittal plane MR images of three volunteers displaying a normal knee, a knee with early signs of OA and a severely affected OA knee. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 11 Diagram showing the scope of cartilage visualization derived from the detected cartilage points due to segmentation. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 12 2D WearMap (right) of example Patient 1 and corresponding Reference template (left) of a normal patient. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 13 2D WearMap (right) of example Patient 2 and corresponding reference template (left) of a patient with early OA. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 14 2D WearMap (right) of example Patient 3 and corresponding reference template (left) of a severely OA affected. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 15 A schematic diagram indicating the TrackBack procedure using Patient 2 as an example. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 16 Diagram to show the mechanisms by which dimensions of a particular defect (within the white circle) may be obtained. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

Fig. 17 A schematic diagram to represent the automatic framework for visualization of articular cartilage. Osteoarthritis and Cartilage 2007 15, 1070-1085DOI: (10.1016/j.joca.2007.03.009) Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions