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MRI CARDIAC EXERCISE DEVICE Team members: Nick Thate, Leader - PowerPoint PPT Presentation

May 23, 2023 •218 likes •401 views

MRI CARDIAC EXERCISE DEVICE Team members: Nick Thate, Leader Andrew Hanske, BSAC Evan Flink, Communicator Tongkeun Lee, BWIG Client: Prof. Naomi Chesler Advisor: Prof. John Webster. Outline Problem Statement Background Information

  1. MRI CARDIAC EXERCISE DEVICE Team members: Nick Thate, Leader Andrew Hanske, BSAC Evan Flink, Communicator Tongkeun Lee, BWIG Client: Prof. Naomi Chesler Advisor: Prof. John Webster.

  2. Outline • Problem Statement • Background Information • Competition and Past BME Designs • Preliminary Testing Results • Design Options • Leg Extension • Leg Press • Stepper • Design Matrix • Final Design • Future Work • Acknowledgements / References

  3. Problem Statement • Design an exercise device to be used in cardiac MRI scans in order to diagnose and assess pulmonary hypertension • Client requirements • MRI compatible materials • Exercise within the bore • Comfortable supine exercise motion • Sufficient resistance to increase cardiac output • Adjustable workloads • Reasonable size and weight • Minimal upper-body movement

  4. Background Information • Pulmonary Hypertension • Abnormally high blood pressure in pulmonary arteries • Decreased artery diameter • Enlarged right ventricle • Chronic decreased blood [O 2 ] • Symptoms • Chest pain or pressure • Fast heart rate, shortness of breath • Fatigue/weakness, light-headedness • Swelling of lower extremities http://health.allrefer.com/health/primary- pulmonary-hypertension-primary-pulmonary- • Traditionally assessed with hypertension.html invasive procedure

  5. Competition • Lode B.V. MRI Ergometer • Expensive ( > $28,000) http://www.lode.nl/en/product s/mri_ergometer • Cycling motion • MRI-compatible Treadmill • Developed at Ohio State University • Exercise occurs outside of the MRI tube • Less accurate results http://www.medcitynews.com/2009/05/commercializati on-ramps-up-on-ohio-state-university-treadmill-used- for-mri-heart-tests/

  6. Past BME Designs • MRI Lower Leg Exerciser • MRI Leg Exercise Device • Spring 2010 • Fall 2010 • Excess friction • Unnatural loading • Insufficient workload • Bulky

  7. Preliminary Testing • Constructed mock MRI bore • Tested exercise options • Excluded biking • Desired Heart Rate: >70-80% of Max HR • Exercise data: Leg Extension Leg Press Stepper Calf Machine Time (min:sec) 3:30 3:00 3:00 1:20 Work Load 90 lb (41 kg) 170 lb (77 kg) 68 rpm 160 lb (73 kg) Heart Rate (bpm) 158 134 164 123

  8. Leg Extension Motion

  9. Leg Extension Design • Pros • Natural motion • Light-weight & relatively small • Effective at raising heart rate • Cons • Some muscle fatigue • Durability concerns

  10. Leg Press Motion

  11. Leg Press Design • Pros • Effective at raising heart rate • Most durable design • Cons • Largest design • Unnatural aerobic motion • Some muscle fatigue • Most upper-body movement

  12. Stepper Motion

  13. Stepper Design • Pros • Natural, comfortable motion • Most effective at raising heart rate • Reduced friction • Cons • More moving parts • May not disassemble easily

  14. Design Matrix Weight Criteria Leg Extension Leg Press Stepper 0.2 Patient Comfort 6 7 9 0.2 Motion Mechanics 9 7 8 0.2 Effectiveness 8 7 9 0.15 Durability 6 8 7 0.1 Ease of Assembly 8 7 6 0.1 Size/Weight 9 6 8 0.05 Cost 9 7 7 Weighted Average 7.65 7.05 8

  15. Final Design • Primary materials: • HDPE, Delrin • Brass fasteners • Glass bearings • Elastic resistance: • Light-weight, resistance can vary, subject to fatigue • Weight resistance: • Heavy/bulky, consistent, durable

  16. Future Work • Order materials and components • Construct and assemble prototype components • Test effectiveness of prototype • Test compatibility of prototype with MRI • Successfully acquire pulmonary blood pressure data through MRI scans before, during, and after exercise

  17. Acknowledgements • Prof. Naomi Chesler • Prof. John Webster • Prof. Darryl Thelen • Alejandro Roldan • Previous BME Design Teams References • Blaivas, A.J. (2010, April 27). Pulmonary hypertension . Retrieved from http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001171/ • Lode B.V. (2008). MRI Ergometer . Retrieved from http://www.lode.nl/en/products/mri_ergometer • McGuire, J., et. al. (2010, December 10). MRI exercise device. Retrieved from http://bmedesign.engr.wisc.edu/websites/project.php?id=332 • Murray, A. (2009, May 14). Ohio state team creates new company based on university invention . Retrieved from http://www.osu.edu/news/newsitem2425 • Yagow, D., et. al. (2010, May 6). An MRI-compatible lower-leg exercising device for assessing pulmonary arterial pressure. Retrieved from http://bmedesign.engr.wisc.edu/websites/project.php?id=29

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