Portable Patient Training Portable Patient Training Device for Lung Cancer Device for Lung Cancer
TreatmentTreatment
Thomas ChiaThomas ChiaJason EthingtonJason Ethington
Brent GeigerBrent GeigerKawai ChanKawai Chan
Client: Bhudatt Paliwal, PhDClient: Bhudatt Paliwal, PhDAdvisor: Willis Tompkins, PhDAdvisor: Willis Tompkins, PhD
Problem StatementProblem Statement
Lung cancer radiation treatments require Lung cancer radiation treatments require stable patient breathingstable patient breathing
A repeatable breathing trainer is desiredA repeatable breathing trainer is desiredDevice to be used at home and be Device to be used at home and be
portableportableDisplay patient’s real-time breathing Display patient’s real-time breathing
pattern and guiding cyclespattern and guiding cycles
TomotherapyTomotherapy
Radiation Treatment for Radiation Treatment for CancerCancer 3-D Imaging of Target Tissue3-D Imaging of Target Tissue Helical Delivery PatternHelical Delivery Pattern Intensity Modulation Intensity Modulation Radiotherapy Radiotherapy (IMRT)(IMRT)
-Multileaf Collimator (MLC)-Multileaf Collimator (MLC) Radiation Concentrates on Radiation Concentrates on Moving Target TissueMoving Target Tissue
Monitoring Breathing PatternMonitoring Breathing Pattern
Current Devices Used During Procedure Infrared Sensor and ReflectorLaser and Laser Sensor SpirometerPatient Must Breathe with a Repeatable
Pattern
Design Motivations and Design Motivations and RestraintsRestraints
Patient Needs to Practice Steady Repeatable Breathing
Show Patient’s Breathing Pattern and Guiding cycle
Small and PortableUser Friendly
Design AlternativesDesign Alternatives
Breathing Pattern Measurement Hardware
-Thermistor, Inductance Pneumography, or Linear Pneumography, or Linear
Potentiometer Potentiometer Data/Signal Processing
- Visual Basic vs. Labview
User Interface and Display- Laptop vs. PDA
Thermistor Based Breathing Thermistor Based Breathing SensorSensor
Use Nasal Thermistor Use Nasal Thermistor or Thermocouple to or Thermocouple to detect airflowdetect airflow
Thermistor output to Thermistor output to microcontroller for microcontroller for processingprocessing
Wireless RF to PC for Wireless RF to PC for long term Data long term Data AcquisitionAcquisition
Javanov et al.
Inductance PneumographyInductance Pneumography
Measure changes in Measure changes in respiratory volume respiratory volume through changes in through changes in inductanceinductance
Small inductor wire Small inductor wire attached across chestattached across chest
Measured change in Measured change in inductance inductance corresponds to corresponds to amplitude of breathamplitude of breath
Inductance PneumographyInductance Pneumography
AdvantagesAdvantages- - Accurate Accurate
- Minimally invasive- Minimally invasive
DisadvantagesDisadvantages
- Measures chest - Measures chest movement movement
- Prone to motion and - Prone to motion and ECG artifactECG artifact
- Requires proper lead - Requires proper lead placementplacement
- Complex- Complex
Linear Displacement Linear Displacement PotentiometerPotentiometer
Miniature linear Miniature linear displacement displacement potentiometerpotentiometer
Cable extension Cable extension converted to analog converted to analog voltagevoltage
Analog signal Analog signal processing and real processing and real time displaytime display
Linear Displacement Linear Displacement PotentiometerPotentiometer
AdvantagesAdvantages
- - SmallSmall
- Minimally invasive- Minimally invasive
- Simple analog - Simple analog voltage divider outputvoltage divider output
DisadvantagesDisadvantages
- - ExpensiveExpensive
- Requires proper - Requires proper placement based on placement based on breathing habitsbreathing habits
(i.e. stomach vs. chest) (i.e. stomach vs. chest)
Design Matrix
Ranking on a 1- 5 scale (5 is best)
Data and Signal Processing
Data Processing Data Processing
- Visual Basic versus LabView program- Visual Basic versus LabView program
- LabView is a program - LabView is a program designeddesigned specially for real-time data acquisition specially for real-time data acquisition
- Less complicated than Visual Basic- Less complicated than Visual Basic
- Able to develop stand-alone - Able to develop stand-alone programsprograms
User Interface and Display
Laptop versus PDA / Pocket PCLaptop versus PDA / Pocket PC
- Most A/D converters are compatible - Most A/D converters are compatible with laptop. with laptop.
- LabView program works on Laptop.- LabView program works on Laptop.
Proposed Solution
Proposed Solution
High CostHigh CostPotentiometer - $200Potentiometer - $200PDA or video goggle - $300+PDA or video goggle - $300+A/D Converter - $100A/D Converter - $100
Piecing together hardware is straightforwardPiecing together hardware is straightforwardSoftware programming will be difficultSoftware programming will be difficult
Future WorkFuture Work
Build potentiometer into small boxBuild potentiometer into small box Construct attachment strapConstruct attachment strap Interface analog output with LabviewInterface analog output with Labview Design Labview program to recognize and Design Labview program to recognize and
display analog signal display analog signal Display breathing cycle waveform in real-time on Display breathing cycle waveform in real-time on
laptoplaptop Scale entire design to PDAScale entire design to PDA Disclose for patentDisclose for patent
Special ThanksSpecial Thanks
Prof. Willis TompkinsProf. Willis Tompkins
Bhudatt Paliwal, PhD. Bhudatt Paliwal, PhD.
Tiezhi Zhang Tiezhi Zhang
Prof. John WebsterProf. John Webster
Burke O’NealBurke O’Neal
Paul VictoreyPaul Victorey