Portable Patient Training Portable Patient Training Device for Lung Cancer Device for Lung Cancer

TreatmentTreatmentBME 400BME 400

Thomas ChiaThomas ChiaJason EthingtonJason Ethington

Brent GeigerBrent GeigerKawai ChanKawai Chan

Client: Bhudatt Paliwal, PhDClient: Bhudatt Paliwal, PhDTiezhi Zhang, PhDTiezhi Zhang, PhD

Advisor: Justin Williams, PhDAdvisor: Justin Williams, PhD

BackgroundBackground

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

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 desiredDesign device to measure and display Design device to measure and display

patient’s breathing patternpatient’s breathing patternDisplay patient’s real-time breathing Display patient’s real-time breathing

pattern against a guiding cyclepattern against a guiding cycle

Client RequirementsClient Requirements

Device must be small and portableStill function as a training device for

used outside of treatmentUsed to monitor patient breathing

while undergoing Tomotherapy treatment

Previous WorkPrevious Work

Continuation from BME 301Completed a functioning prototypeThree major components:

-Sensing hardware

-Data acquisition

-LabView program

Previous Work – Sensing HardwarePrevious Work – Sensing Hardware

Linear potentiometer attached around chest

Voltage change corresponds to chest movement

9 Volt battery and switch

Previous Work – User Interface and Previous Work – User Interface and Data AcquisitionData Acquisition

National Instruments PCMCIA DAQ-6024E A/D converter

Laptop with PCMCIA port and LabView 7.0

Previous Work – LabView Software Previous Work – LabView Software ProgramProgram

Displayed breathing pattern against guiding pattern

Ability to save multiple guiding patterns

Current Work – Sensing Current Work – Sensing HardwareHardware

Design measurement hardware as small as possible

Attach only potentiometer to strapBattery and switch housed away from

strap All materials must be evaluated for

compatibility with radiation

Current Work – Sensing Current Work – Sensing HardwareHardware

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

Current Work – PDA and Data Current Work – PDA and Data Acquisition Acquisition

Previous version on a laptopPrevious version on a laptopScale the patient feedback Scale the patient feedback

interface down to portable PDAinterface down to portable PDANeed a data acquisition card Need a data acquisition card

(A/D converter) to fit inside (A/D converter) to fit inside PDAPDA

Current Work – PDA and Data Current Work – PDA and Data Acquisition Acquisition

Asus: MyPal A620Asus: MyPal A620Windows PocketPCWindows PocketPC400MHz Intel XScale400MHz Intel XScaleSupports Compact Flash Supports Compact Flash

(CF)(CF)MSRP: $300MSRP: $300

Current Work – PDA and Data Current Work – PDA and Data Acquisition Acquisition

Compact Flash Data Compact Flash Data Acquisition CardAcquisition Card

24-bit Analog Input24-bit Analog InputSupports LabVIEW PDASupports LabVIEW PDAMSRP: $850MSRP: $850

Current Work – LabView 7.1 Current Work – LabView 7.1 Software Software

Improve display of guiding cycle vs. real-Improve display of guiding cycle vs. real-time breathing patternstime breathing patterns (i.e. waveform (i.e. waveform graph)graph)

Convert to PDA format that is compatible Convert to PDA format that is compatible with the use of Pocket PCwith the use of Pocket PC

Current Work – LabView 7.1 Current Work – LabView 7.1 Software Software

Compile LabView software program into Compile LabView software program into PDA formatPDA format

Design and test in PDA emulator to mimic Design and test in PDA emulator to mimic the actual PDA devicethe actual PDA device

Sampling rate on PDA can be 1000 Sampling rate on PDA can be 1000 samples/sec+samples/sec+

Future Work Future Work

File patent application disclosureFile patent application disclosureContact IRB regarding human subjects Contact IRB regarding human subjects

implicationsimplicationsBegin testing of device outside of Begin testing of device outside of

Tomotherapy machineTomotherapy machineTest device inside Tomotherapy machineTest device inside Tomotherapy machine

Special ThanksSpecial ThanksDr. Bhudatt Paliwal Dr. Bhudatt Paliwal

Professor of Human Oncology & Medical PhysicsProfessor of Human Oncology & Medical Physics

Director Radiation Oncology Physics                         Director Radiation Oncology Physics                        

Tiezhi ZhangTiezhi Zhang Assistant Researcher Assistant Researcher

Human Oncology DepartmentHuman Oncology Department

Justin WilliamsJustin WilliamsProfessor Biomedical EnginneeringProfessor Biomedical Enginneering

University of Wisconsin MadisonUniversity of Wisconsin Madison

Adam SweetAdam SweetNational Instruments ConsultantNational Instruments Consultant

Questions?Questions?