1. MRI Lower Leg Exerciser
Team members:
Deborah Yagow, Team Leader
Colleen Farrell, Communicator
Val Maharaj, BWIG
Amy Lenz, BSAC
Client: Alejandro Roldan
Advisor: Naomi Chesler

2. Overview Problem Statement Project Motivation Client Requirements
Competition
Design Options
Design Matrix
Future Work

3. Problem Statement Design a lower leg exerciser Compatible with:
MR imaging
Ultrasound
Echocardiography
Cardiopulmonary research on pulmonary hypertension patients and healthy volunteers
Repeatable loads
Biofeedback

4. Project Motivation
Researching pulmonary blood flow in hypertensive patients
MRI imaging before and after exercise
Doppler Ultrasound and Echocardiogram studies possible too
Used for patients and normals
Pulmonary Arteries in Blue (

5. Client Requirements MRI compatible Adjustable
Patient
Scanner
Exercise maximal workload and at 40%
30mmHg blood pressure increase
Repeatable
Ergonomic and comfortable
Accurate biofeedback
Taken by Amy Lenz

6. Competition fMRI Mechatronic Ankle Device
Lode MRI-compatible ergometer
Above: Doane et al., 2007
Left:

7. Design Option #1: Cycle Large muscle recruitment Adjustable resistance
Cardio intensive
Simple motion for patients
Self-generated image

8. Option #2: Leg Press Simple motion for patients
Legs move independently
Variable resistance
Spring
Dashpot
Therabands
Self-generated image

9. Option #3: Flexion with Bands
Large range of motion for patient
Simple construction
Interchangeable band resistances
Possible lack of consistency
Self-generated image

10. Design Matrix Category Weight of Category Cycle Leg Press Flexion
Safety 20
Adjustability 15 10 12 13
Client Preference 8
Effectiveness
Price 5 3 4
Durability
Repeatability 14
Ease of Manufacturing
Total
100 87 83 78

11. Future Work Write IRB protocol for preliminary ultrasound testing
Material research
Determine best option for biofeedback
Build prototype

12. Acknowledgements Alejandro Roldan Professor Chesler
Dr. Scott Reeder- Dept. of Medical Physics
Dr. Bill Schrage- Dept. of Kinesiology

13. References
Doane, D. et al. (2007). fMRI compatible mechatronic ankle device. Technical Design Report. Department of Mechanical, Industrial, and Manufacturing Engineering. Northeastern University.
Holverda, S. et al. (2009). Stroke volume increase to exercise in chronic obstructive pulmonary disease is limited by increased pulmonary artery pressure. Heart. Vol. 95:
Handoko, M. et al. (2009). Opposite Effects of Training in Rats With Stable and Progressive Pulmonary Hypertension. Circulation. Vol. 120:
Porges, S. (1992). Vagal Tone: A physiologic marker of stress vulnerability. Pediatrics. Vol. 90:
Pulmonary Artery Image:
Raymer, H. et al. (2006). Characteristics of a MR-compatible ankle exerciser ergometer for a 3.0 T head-only MR scanner. Medical Engineering and Physics. Vol. 28:

14. Questions?