ANNUAL MEETING RERC on Technologies for Children with

ANNUAL MEETING RERC on Technologies for Children with Orthopedic Disabilities NIDRR H133E100007 Program Director: Gerald F. Harris, Ph.D., P.E. Program Co-Director: Li-Qun Zhang, Ph.D. D3: Biplanar Fluoroscopic System for Dynamic, in vivo Foot and Ankle Motion Analysis Taly Gilat-Schmidt, Ph.D. and Janelle Cross,

M.S. D3: Biplanar Fluoroscopic System for Dynamic, in vivo Foot and Ankle Motion Analysis Subject population normal adults: 5 Project goal Develop a biplane x-ray fluoroscopy system for analyzing in vivo motion of the bare or shod foot

D3 Specific Aims To develop a prototype biplane fluoroscopy system and manual feature extraction method for in vivo studies of subtalar hindfoot kinematics D3 Conceptual Model Walkway with force plate

Bi-plane x-ray images 3D Localization X-ray sources q Image

Intensifiers Milwaukee Foot Model 3D MRI images D3 Tasks Perform phantom study to guide design of fluoroscopy system

Construct biplane fluoroscopy system Develop geometry calibration devices and software Implement image processing software to localize anatomy in 3D from the biplane xray images D3 Tasks Validate localization accuracy with dynamic phantom study Obtain IRB approval for normal subject trial

Normal subject trial to demonstrate feasibility of kinematic and kinetic analysis in bare and shod foot D3 Time Line Activity: Phase 1: Phantom studies with 2D fluoroscopy system Phase 2: Construct biplane fluoroscopy system Phase 3: Develop feature extraction

software Phase 3: Dynamic phantom study Phase 3: Pilot subject studies Year 1 Year 2 Year 3 Year 4

Year 5 D3 Progress Completed: Performed static phantom study - investigated fluoroscopy geometry - quantified gantry crosscontamination effects Completed: Constructed biplane fluoroscopy system Completed: Developed geometry

calibration devices and software D3 Progress In progress: Implementing image processing software to localize anatomy in 3D from the biplane x-ray images In progress: IRB protocol submitted and undergoing review

D3 Accomplishments Abstract accepted for 2013 SPIE Medical Imaging Conference: J. A. Cross, B. McHenry, T.G. Schmidt, Quantifying cross scatter in biplane fluoroscopy motion analysis systems. D3 Challenges & Solutions Challenges/Solutions Challenge: Manual feature extraction for 3D

localization was too time intensive and error prone to be practical. Solution: We evaluated and are implementing public domain software for localization through modelbased tracking. Our attempt at using JointTrack was unsuccessful. We are now using Autoscoper from Brown University D3 Opportunities The image processing software we are using for localization is a conglomeration of several available software packages. A potential

opportunity is to integrate these software algorithms into one package which could be disseminated Follow-up motion analysis study for different shoe wear conditions using developed system Year 3 Plans Complete IRB approval process for normal subject trial Normal subject trial to demonstrate feasibility of kinematic and kinetic analysis in bare and

shod foot

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