1. µPET/CT Heating Device
Team Leader – Justin Schmidt
Communicator – Eric Printz
BWIG – Victoria Vasys
BSAC – Eric Bader
Client – Dr. Robert Jeraj Ph.D
Advisor – Professor Brenda Ogle Ph.D

2. Overview Description of µPET/CT Medical Imaging Tool
Causes of Hypothermia on the Animals
Proposal
Heating System Requirements
Heating System Design-Current Design
Heating System Design-Modifications/Design Matrices
Future Work

3. µPET/CT Medical Imaging Tool
Used to study cancerous cells in small animals
PET tracks intensity of cells’ metabolic rate
CT provides detailed anatomy image
Together they represent complete image

4. Hypothermia of the Animals
Metabolic rates of the animals under anesthesia are greatly reduced
Can lead to hypothermia or death
Currently heat lamps provide non-uniform temperatures

5. Proposal
Design a heating device to prevent hypothermia and help increase accuracy of scans

6. Heating System Requirements
Client Requirements
No metal parts
Controllable temperature near subjects body temperature
No moving parts
Device must fit inside µPET/CT scanning chamber (10 cm. diameter)

7. Current Design Mouse enclosure Two chamber system Removable platform
Poor Insulation

8. Current Design
Heater
Nichrome
Insulation
DC Power Supply

9. Current Design
Pump
Fish tank air pump
Tubing
Poor Insulation
Vinyl

10. Modifications Mouse enclosure Outer insulation Wrap-around tube
Platform
Accessibility
118°F required in
lower chamber

11. Platform Design Matrix
Criteria
Weights
Mesh
Polyethylene
Acrylic
Cost
0.1
0.2
0.3
Conductivity
0.35
1.05
0.7
Machineability
0.4
0.6
Mouse Health
TOTAL 1
1.80
2.45
1.75

12. Modifications Heater Nichrome Insulation Plug in power Two Coils
Thicker PVC
Plug in power

13. Heater Design Matrix Criteria Weights Thicker PVC Copper
Thermo-Insulated
Cost
0.1
0.3
0.2
Insulation
0.6
1.2
1.8
Machineability
0.9
TOTAL
1.00
2.4
1.4
2.2

14. Modifications
Tubing
Vinyl Tubing
Poor Insulation

15. Tubing Design Matrix Criteria Weights Insulation Wrap PVC Teflon
0.5
1.5
1.0
Machineability
0.1
0.3
0.2
Durability
0.6
0.4
Cost
TOTAL
1.6
2.7
1.7

16. Future Work Heater Mouse Enclosure Calibration and Testing Assemble
Build Power Supply
Test Output
Mouse Enclosure
Wrap Around Tubing
Platform
Insulate
Calibration and Testing

17. Acknowledgements
Mahesh Mahanthappa
Professor Ogle
Paul Fraser Mo

18. Questions?

19. Heat Transfer Calculations

20. References
MatWeb – Online Material Data Sheet. Online.
Webster, J. G Bioinstrumentation. Hoboken, NJ: John Wiley & Sons, Inc.