Impedance Tomography (EIT) Measurement of Blood Flow to Monitor - - PowerPoint PPT Presentation

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Impedance Tomography (EIT) Measurement of Blood Flow to Monitor - - PowerPoint PPT Presentation

Dec 28, 2022 431 likes •699 views

Technical Developments to Enable Electrical Impedance Tomography (EIT) Measurement of Blood Flow to Monitor Cardiac Output Key Engineering Contributions Helga Ross Systems and Computer Engineering, Carleton University, Ottawa, ON Outline

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Technical Developments to Enable Electrical Impedance Tomography (EIT) Measurement

  • f Blood Flow to Monitor Cardiac Output Key

Engineering Contributions

Helga Ross Systems and Computer Engineering, Carleton University, Ottawa, ON

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Outline

  • Introduction
  • Problem
  • Contributions
  • Results
  • Conclusion
  • Future Work
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Introduction

  • Heart Disease: “is a group of conditions affecting

the structure and functions of the heart.”

  • Examples:

– Angina – Arrythmia – Atrial fibrillation – Coronary Artery Disease (CAD) – Etc.

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Introduction (2)

  • CAD

– Most common form of heart disease – Occurs when arteries in the heart are blocked – Complications include

  • Angina (chest pain) due to lack of oxygen to the heart
  • Heart Attack due to part heart muscle death from lack of
  • xygen

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Introduction (3)

  • Gold Standard for Diagnosis of CAD

– Angiography

  • Catheter inserted (groin or arm)
  • Guided through artery to a position near the heart
  • Contrast agent is administered through catheter
  • X-rays are taken in conjunction with release of contrast

agent – Cardiac CT

  • Intravenous pump hookup
  • Contrast agent administered
  • X-ray images are taken in conjunction with the release of

contrast agent

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Introduction (4)

  • EIT

– Experimental imaging technique where changes inside the body can be imaged using a set of electrodes on the surface – Advantages: Portable, non-ionizing, high acquisition rates, relatively inexpensive – Disadvantages: Low resolution, high sensitivity to electrode movement, imaging anomalies are not well understood, use

  • f ill conditioned problem to calculate images

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Problem

  • The goal of this thesis is to develop a collection of

Electrical Impedance Tomography (EIT) techniques to allow for monitoring of cardiac

  • utput and other parameters of heart function

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Contributions

  • EIT Protocol
  • Hardware Toolset
  • Software Toolset

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Contributions (CT Protocol)

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Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Contributions (EIT Protocol)

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Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Contributions (Hardware Toolset)

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Contributions (Hardware Toolset) (2)

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Contributions (Hardware Toolset) (3)

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Contributions (Software Toolset)

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Contributions (Software Toolset) (2)

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Contributions (Software Toolset) (3)

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Results (Simulation)

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Results (Simulation) (2)

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Results (Human Experiment)

  • Subject #1

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Conclusion

  • Goal of this thesis was to design a toolset to

enable the measurement of EIT cardiac parameters

  • The results are promising
  • A colleague is taking over this work

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Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Future Work

  • Compare EIT and CT Blood flow
  • Test toolset on patients at UOHI
  • Tweak EIT and Software Protocol as needed
  • Include other EIT methods to improve cardiac EIT

imaging

  • Try several EIT systems
  • Increase number of patients imaged with final

hardware/software toolset

Introduction → Problem → Contributions → Results → Conclusion → Future Work

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Thank You

  • Questions
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Results (Human Experiment) (2)

  • Subject #2
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Results (Human Experiment) (3)

  • Subject #3
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Results (Simulation) (2)

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Contributions (Software Toolset) (4)