Neck Rotation Device for Use in MRI and CT Scans

1
Neck Rotation Device for Use in MRI and CT Scans

• Client Dr. Victor Haughton
• Group Members
• Kevin Johnson Leader
• Arinne Lyman Communicator
• Micah Brown BWIG
• Jon Cappel BSAC
• Matt Smith BWIG
• Advisor Prof. Mitch Tyler

2
(No Transcript)
3
Overview

• Motivation
• Neck Rotation and Prior Work
• Neck Rotator Modification
• MR Coil
• Validation

4
Problem Statement Motivation

• Develop a method and device for isocentric axial
  and flexion/extension rotations to be used for
  clinical diagnosis of cervical spine disorders.
• This has diagnostic applications in
• Degenerative Disks
• CSF Disorders
• Pinched Nerves

5
Previous Work

• The Device

6
Problems With Old Device

• Axial rotation range too small
• Flexion/extension range too small
• Patient positioning problems
• No compatible surface coils on campus
• No research validation
• No in vivo validation

7
Device Modifications

• Extended upper slot to increase isocentric
  rotation
• Modified inner ring to increase flexion/extension
• Refastened and reinforced ears for
  flexion/extension

8
Future Modifications

• Introduce a mat to change patients position
• Modify base to merge with MR scanner table
• Further investigate head/neck padding

9
MR Coil Background
10
MR Coil

• Few coils compatible
• Flex
• Body
• Quality concerns
• Test to determine coil quality
• Scanned water phantom with 2-MR Sequences
• Computed and compared SNR

11
Flex Coil
Body Coil
Head Coil
C-Spine Coil
12
MR Coil
13
Coil Conclusions

• Body coil sufficient for
• Degenerative disk diagnostics
• Biomechanical studies
• Need better coil for
• Quantitative CSF studies
• Nerve imaging
• Better coils exist
• Flex Array Coils
• Carotid Phase Array Coil

14
Phantom Validation

• To test for true isocentric rotation
• Take MR images at /- angles
• Find center of rotation of image
• Verify that center on image is the center axis of
  phantom
• If not, adjust padding to raise/lower phantom in
  device

15
Phantom
16
Phantom Validation

• To test for flexion/extension reference point
• Take MR images at /- degrees
• Find point of rotation on phantom
• Find point of reference on device to use for
  patient testing

17
In Vivo Validation

• Volunteer test to verify motion
• Line up approximate center of rotation
• Image cervical spine at /- angles
• Find the center of rotation of images
• Verify that center of rotation exists at center
  of spine and flex/ext axis
• Adjust body position accordingly

18
In Vivo Validation

• Patient comfort test
• Have research subjects/patients fill out survey
  before/after exam
• Sample questions
• - Comfort of device?
• - Is rotation smooth?
• - Aesthetically pleasing?

19
Acknowledgements

• Dr. Vic Haughton
• Haughton VM, Rogers B, Meyerand ME, and Resnick
  PK. Measuring the axial rotation of lumbar
  vertebrae in vivo with MR imaging. Amer. Journal
  of Neuroradiology. 231110-1116. Aug 2002.
• Prof. Wally Block
• Prof. Mitch Tyler
• Brian Asti
• Asti B, Connemara R, Hallam M, Nelson T, OBrien
  J, Puccinelli J, Sydnor R, and Wiese S. Insert
  for an MRI gantry that provides graded rotation
  of the spines lumbar vertebrae. University of
  Wisconsin-Madison Biomedical Engineering Design
  Courses. Spring 2001 Archives. 2001.

20
Any Questions?