MRI Head Motion Detector

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MRI Head Motion Detector

• Michael L. Wells
• Thomas H. Chia

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Pneumatic Sensors

• Air compartments serve as support
• Air compartments measure pressure change
• Available/existent technology
• Requires multiple sensors
• Poor accuracy

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Sonar/Laser Sensors

• Sonar/Laser sensors placed around head
• Technology similar to laser rulers
• Accurate measurements
• Require multiple sensors
• Require calibrations before use

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Pressure Plates

• Pressure plates measure displacement of head
  weight
• Plates easily incorporated into head support
• Only measures change of weight
• Requires calibration before use

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Optical Image Tracking

• Optical computer mouse technology
• Capable of millimeter resolution
• Sampling of 2000 images/sec.
• Off the shelf technology
• L.E.D. would cast color light

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Proposed Solution

• Optical Tracking Technology
• Complementary Metal Oxide Semiconductor
  (CMOS)-Sensor
• Light Emitting Diode (LED) Illumination Source
• Digital Signal Processor (DSP)- Motion detecting
  algorithm

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Other Advantages

• Off the shelf technology
• Small sensors implantable into head support
• Approximately 20 per sensor
• Avoids direct contact with patient
• Each sensor detects planar movement

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Possible Sensor Locations

• Two sensors
• -Forehead/Behind head
• -Behind ears
• One sensor
• -Behind head with bite bar

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Overview
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Future Work

• Optimal Sensor Placement
• Effects of patients hair
• Avoiding patient distraction
• Greatest head displacement
• Take measurements in simulator
• Analyze potential head movements

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Future Work

• Software Development
• Contact computer science department
• Search of commercial software
• Hardware Testing
• Vendor research-www.agilent.com
• Hardware manipulation

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• Questions?