Statistical Shape Analysis
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1 Statistical Shape Analysis Shireen Elhabian, Prateep Mukherjee and Ross Whitaker Saturday, January 4 th, 2014
2 Study of Shape What questions can it answer? Genetics How does a gene mutation change skeletal development? Evolutionary Biology Is the shape of a given bone a good classifier for species? Neuroanatomy Is there a difference in the shape of brain structures between schizophrenic and normal populations? Biomechanics How does the hip joint change as a function of age?
3 Shape analysis is ubiquitous Group Differences Normative Growth Variability in population
4 Statistical Shape Analysis It s all about representation
5 Statistical Shape Analysis It s all about representation y R 2 p k = x k, y k T y M R 2M y 1 x 1 x Configuration Space S i = p i 1 p i 2 p i M Shape Space = x i 1 y i 1 x i M y i M
6 Statistical Shape Analysis It s all about representation R 2 p k = x k, y k T R 3 p k = x k, y k, z k T y y z x Configuration Space x
7 Statistical Shape Analysis It s all about representation Given a collection of shapes, we can use a point based representation for each S i How do we choose the same points??
8 Point Correspondence Model Balancing accuracy vs. low variance Accurate Representation (in Configuration Space) vs. Compact Model (in Shape Space)
9 Correspondence Pipeline
10 ShapeWorks Pipeline Preprocessing Input Segmentation Distance Transform Antialiased Surface Optimization Entropy Minimization Open Surfaces Linear Regression Visualization/ Modes of Variation Group Differences Regression Shape Applications
11 Toy Example Synthetic Tori Population: Tori parameterized by radii (R,r) Generated Correspondences
12 Toy Example Synthetic Tori Modes of variation
13 Applications
14 ShapeWorks for Cardiology Left Atrial Appendage Stroke Prediction The left atrial appendage (LAA) is a muscular pouch connected to the left atrium of the heart. It can be thought of as a left-over heart after we grow up. Functions as a reservoir for the left atrium. If it traps blood longer than it should be, blood clots and causes stroke Can shape analysis aid in predicting whether someone will have a stroke or not?!!
15 ShapeWorks for Cardiology Left Atrial Appendage Stroke Prediction The LAA of two groups was segmented, one group with no history of having stroke while the other group has evident history of having stroke. Group 1: no history of stroke Group difference (group 1 to group 2) Group 2: history of stroke
16 ShapeWorks for Cardiology Left Atrial Appendage Stoke Prediction The significant shape difference between the two groups was found in the fifth PCA mode. A boxplot of the distributions is shown on the right. The p-value for a t-test of significant group mean difference is
17 ShapeWorks for Orthopedics CAM-FAI Characterization Dr. Jeffery Weiss, Dr. Andrew Anderson, Orthopedics Department of Orthopedics, University of Utah CAM-FAI = cam type Femoro Acetabular Impingement Fig: Radiographs of subjects with healthy (left) and cam FAI (right) femurs. Circles indicate the anterolateral head-neck junction. Treatment: surgical debridement How much to shave off? And from where? Objective: quantify 3D variation and morphologic differences between control and cam femurs Harris, Michael D., Manasi Datar, Ross T. Whitaker, Elizabeth R. Jurrus, Christopher L. Peters, and Andrew E. Anderson. "Statistical shape modeling of cam femoroacetabular impingement." Journal of Orthopaedic Research 31, no. 10 (2013):
18 ShapeWorks for Orthopedics CAM-FAI Characterization Dr. Jeffery Weiss, Dr. Andrew Anderson, Orthopedics Department of Orthopedics, University of Utah Mean Shapes Mean shape deviations between control and CAM groups most pronounced at the anterolateral head-neck junction (max = 2.7mm) Fig: Two views (two rows) of the mean control (left) and cam (right) shapes. Mean control shape (center), color coded to depict shape differences in comparison with mean CAM shape Harris, Michael D., Manasi Datar, Ross T. Whitaker, Elizabeth R. Jurrus, Christopher L. Peters, and Andrew E. Anderson. "Statistical shape modeling of cam femoroacetabular impingement." Journal of Orthopaedic Research 31, no. 10 (2013):
19 ShapeWorks for Orthopedics CAM-FAI Characterization Dr. Jeffery Weiss, Dr. Andrew Anderson, Orthopedics Department of Orthopedics, University of Utah Modes of variation Understand morphological variability in Cam-FAI Consistent differences captured by individual modes for control and CAM groups Harris, Michael D., Manasi Datar, Ross T. Whitaker, Elizabeth R. Jurrus, Christopher L. Peters, and Andrew E. Anderson. "Statistical shape modeling of cam femoroacetabular impingement." Journal of Orthopaedic Research 31, no. 10 (2013):
20 ShapeWorks for Orthopedics Multiple Osteochondromas Dr. Kevin Jones, M.D., Huntsman Cancer Institute Department of Orthopedics and Huntsman Cancer Institute, University of Utah Multiple osteochondromas (MO), Individuals with multiple osteochondromas (MO) demonstrate shortened long bones. Possible reason: steal phenomenon Studied using mice models Data: Segmented femurs (50), Segmented tibiae (36) Can we characterize the effects of disease progression? Segmented femur and tibia+fibula used in study Jones, Kevin B., Manasi Datar, Sandhya Ravichandran, Huifeng Jin, Elizabeth Jurrus, Ross Whitaker, and Mario R. Capecchi. "Toward an understanding of the short bone phenotype associated with multiple osteochondromas." Journal of Orthopaedic Research (2012).
21 ShapeWorks for Orthopedics Multiple Osteochondromas Group mean differences Indicate shortening of mutant bones Do not validate steal phenomenon Dr. Kevin Jones, Huntsman Cancer Institute Department of Orthopedics and Huntsman Cancer Institute, University of Utah Fig: Group mean differences for femur Fig: Group mean differences for tibia+fibula Color code: expansion (blue) or contraction (yellow) w.r.t normal Statistically significant group differences (individual p-values < 0.01) Correlation with length evident visually in the group means Jones, Kevin B., Manasi Datar, Sandhya Ravichandran, Huifeng Jin, Elizabeth Jurrus, Ross Whitaker, and Mario R. Capecchi. "Toward an understanding of the short bone phenotype associated with multiple osteochondromas." Journal of Orthopaedic Research (2012).
22 ShapeWorks for Orthopedics Multiple Osteochondromas Dr. Kevin Jones, Huntsman Cancer Institute Department of Orthopedics and Huntsman Cancer Institute, University of Utah Fig: Directional analysis for femur Arrows show local deformation from mean-normal to mean-mutant shape Gives visual indication of the steal phenomenon, with: Tangential deformation in most areas of the mean shape, leading to shortening in length Orthogonal deformation near bumps, leading to local increase in girth Jones, Kevin B., Manasi Datar, Sandhya Ravichandran, Huifeng Jin, Elizabeth Jurrus, Ross Whitaker, and Mario R. Capecchi. "Toward an understanding of the short bone phenotype associated with multiple osteochondromas." Journal of Orthopaedic Research (2012).
23 Correspondence Pipeline
24 Thanks for your attention
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