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TAs: Süleyman Yasin Peker |
Topics covered:
Introduction to Verasonics Vantage 32LE Ultrasound Research System.
Introduction to ultrasound transducers.
Introduction to ultrasound imaging modes.
Real-time data acquisition using Verasonics.
Time-of-Flight measurement of common carotid artery (cca) using ultrasound and image processing.
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.
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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Set up the Verasonics system for Colour Doppler imaging of the CCA.
Acquire Color Colour 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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Using the acquired B-Mode images, select the frames that could be the possible systolic and diastolic blood pressure frames. Calculate the artery diameter change and discuss the discuss the health situation of the subject by giving references to the literature.
Using the raw RF signals acquired during the Colour Doppler Imaging, calculate the spectrogram of a single channel data and observe the flow pattern. If flow pattern is not visible, change the processed channel and calculate again. Plot the spectrogram of the signal.