Page Comparison

Topics covered:

1. Introduction to Verasonics Vantage 32LE Ultrasound Research System.

2. Introduction to ultrasound transducers.

3. Introduction to ultrasound imaging modes.

4. Real-time data acquisition using Verasonics.

5. Time-of-Flight measurement of common carotid artery (cca) using ultrasound and image processing.

6. Flow measurement and colour doppler imaging using ultrasound.

Experiment details:

Introduction

This experiment involves the use of the Verasonics Vantage 32LE, a sophisticated ultrasound research system, to explore various aspects of ultrasound imaging and data acquisition. Participants will gain hands-on experience with different ultrasound imaging modes, including A-Mode, B-Mode, Colour Doppler, and Power Doppler, while understanding the applications of linear array, curvilinear/convex, and phased array transducers. The experiment will also cover real-time data acquisition using the Verasonics system, focusing on measuring Time-of-Flight values for echoes and analyzing the power spectrum of ultrasound signals in Doppler mode. This comprehensive approach will provide a deeper understanding of both the technical and practical aspects of ultrasound technology.

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• A-Mode (Amplitude Mode):

  • Explain the concept of A-mode imaging and its historical significance.

  • Demonstrate the use of A-mode to measure distances within tissues.

• B-Mode (Brightness Mode):

  • Describe B-mode as the most common imaging mode for real-time 2D imaging.

  • Show how to set up and acquire B-mode images of the common carotid artery (CCA).

  • Discuss the interpretation of B-mode images, focusing on anatomical structures.

• Color Colour Doppler Imaging:

  • Introduce the principles of Doppler ultrasound and how it measures blood flow velocity.

  • Demonstrate the setup and acquisition of Color Doppler images, focusing on blood flow within the CCA.

  • Discuss the interpretation of Color Doppler images, with emphasis on flow direction and velocity.

• Spectral Doppler Imaging:

  • Explain the concept of Spectral Doppler and its use in quantifying blood flow velocity.

  • Demonstrate how to acquire a Spectral Doppler waveform and interpret the results, focusing on the CCA.

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• Use the B-mode images acquired previously to identify the CCA and measure the depth of the anterior and posterior walls.

• Calculate the TOF for ultrasound pulses reflecting from these walls using the equations described in the theoretical background section.

• Use image processing software to analyze the B-mode images and extract TOF data.

• Discuss the significance of TOF measurements in clinical practice, such as assessing arterial wall thickness.

6. Flow Measurement and Color Colour Doppler Imaging Using Ultrasound

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• Procedure:

  Set up the Verasonics system for

  Color

  Colour Doppler imaging of the CCA.

• Acquire Color Doppler images, ensuring that the flow is visualized across the vessel.

• Use Spectral Doppler to obtain a waveform of the blood flow velocity.

• Measure key parameters from the Doppler waveform, such as peak systolic velocity (PSV) and end-diastolic velocity (EDV).

• Analyze the flow patterns, and discuss potential clinical implications, such as identifying stenosis or other vascular conditions.

Report requirements:

The report for this part is expected to include: 

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