Arin Ellingson Anika Lohrentz Ben Schoepke Alice Tang Advisor- Paul Thompson Ph.D. Client- Ken Schreibman M.D., Ph.D.

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 Problem Statement  Background  Client Requirements  Previous Semester’s Work  Design Components  Future Work

 Need standard way to image feet  Simulate weight bearing conditions

 Computed tomography (CT)  X-ray imaging from many angles  Computer reconstruction  Client’s focus: ankle CT

 Apply measurable load to feet  Contains no radiopaque materials  Holds feet in standardized position  Portable  Able to be disinfected

 Developed rough prototype to prove concept

1. Air Bladder 2. Air Pump 3. Pressure Measurement 4. Linear Plate Motion

 Requirements  Flat ends  Extends 3-5 in.  Cost effective  Matjack brand  $290  Inflatable cube  $13

 Battery powered  Remote controlled Rena Aquarium Pump ~ $20 Hargraves Diaphragm Pump ~ $50 Pump Control Circuit

 Pressure = Force / Area  Surface area = 64 in 2  Force ~ 50 to 80 pounds  Therefore pressure ~ 0.8 to 1.3 psi  Measured with digital pressure gauge or transducer

 Guide rails + Simple, easy to implement - May not be completely stable  Scissor jack + Stable, purely linear motion - Complex

1. Air Bladder 2. Air Pump 3. Pressure Measurement 4. Linear Plate Motion

 Pursue patent through WARF  Build circuit for pump control  Assemble device  Run through CT scanner with phantom  IRB approval for testing  Conduct research project

 Smith, H. Computed tomography. GE Healthcare Medcyclopaedia 2006, 3 (2006) Questions?