Portable Patient Training Device for Lung Cancer Treatment

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Portable Patient Training Device for Lung Cancer
Treatment

• BME 400
• Thomas Chia
• Jason Ethington
• Brent Geiger
• Kawai Chan
• Client Bhudatt Paliwal, PhD
• Tiezhi Zhang, PhD
• Advisor Justin Williams, PhD

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Background

• Radiation Treatment for Cancer
• 3-D Imaging of Target Tissue
• Helical Delivery Pattern
• Intensity Modulation Radiotherapy (IMRT)
• -Multileaf Collimator (MLC)
• Radiation Concentrates on Moving Target Tissue

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Problem Statement

• Lung cancer radiation treatments require stable
  patient breathing
• A repeatable breathing trainer is desired
• Design device to measure and display patients
  breathing pattern
• Display patients real-time breathing pattern
  against a guiding cycle

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Client Requirements

• Device must be small and portable
• Still function as a training device for used
  outside of treatment
• Used to monitor patient breathing while
  undergoing Tomotherapy treatment

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Previous Work

• Continuation from BME 301
• Completed a functioning prototype
• Three major components
• -Sensing hardware
• -Data acquisition
• -LabView program

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Previous Work Sensing Hardware

• Linear potentiometer attached around chest
• Voltage change corresponds to chest movement
• 9 Volt battery and switch

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Previous Work User Interface and Data
Acquisition

• National Instruments PCMCIA DAQ-6024E A/D
  converter
• Laptop with PCMCIA port and LabView 7.0

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Previous Work LabView Software Program

• Displayed breathing pattern against guiding
  pattern
• Ability to save multiple guiding patterns

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Current Work Sensing Hardware

• Design measurement hardware as small as possible
  
• Attach only potentiometer to strap
• Battery and switch housed away from strap
• All materials must be evaluated for compatibility
  with radiation

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Current Work Sensing Hardware

• Use larger strap to allow secure attachment of
  potentiometer to plastic mounting plate
• Potentiometer wire embedded in elastic portion of
  strap
• Extend wires and battery away from strap,
  construct smaller box

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Current Work PDA and Data Acquisition

• Previous version on a laptop
• Scale the patient feedback interface down to
  portable PDA
• Need a data acquisition card (A/D
  converter) to fit inside PDA

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Current Work PDA and Data Acquisition

• Asus MyPal A620
• Windows PocketPC
• 400MHz Intel XScale
• Supports Compact Flash (CF)
• MSRP 300

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Current Work PDA and Data Acquisition

• Compact Flash Data Acquisition Card
• 24-bit Analog Input
• Supports LabVIEW PDA
• MSRP 850

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Current Work LabView 7.1 Software

• Improve display of guiding cycle vs. real-time
  breathing patterns (i.e. waveform graph)
• Convert to PDA format that is compatible with the
  use of Pocket PC

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Current Work LabView 7.1 Software

• Compile LabView software program into PDA format
• Design and test in PDA emulator to mimic the
  actual PDA device
• Sampling rate on PDA can be 1000 samples/sec

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Future Work

• File patent application disclosure
• Contact IRB regarding human subjects implications
• Begin testing of device outside of Tomotherapy
  machine
• Test device inside Tomotherapy machine

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Special Thanks

• Dr. Bhudatt Paliwal
• Professor of Human Oncology Medical Physics
• Director Radiation
  Oncology Physics                        
• Tiezhi Zhang
• Assistant Researcher
• Human Oncology Department
• Justin Williams
• Professor Biomedical Enginneering
• University of Wisconsin Madison
• Adam Sweet
• National Instruments Consultant

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Questions?