| Info |
|---|
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.
...
The earliest ultrasound mode showed returning echoes in a one dimensional, graphical format (Figure 3). Known as amplitude or A-mode, the information could be used to measure the distance between, or thickness of, tissues. An example is examining the cornea, lens and chambers of the eye.
“B” or Brightness mode represents the amplitude peaks seen in A-mode as dots or pixels of varying brightness (Figure 2).
...
Using B-mode, ultrasound systems can send sequential ultrasound pulses out in different directions to form multiple image lines. This process is completed quickly and repeatedly, creating the typical ultrasound image seen on all systems.
In this display mode, Doppler data received by the ultrasound system is displayed as coloured pixels within the sample box shown on the B-mode image (Figure 6). This gives information about direction and a semi-quantitative assessment of blood flow velocities.
...
A variation of colour Doppler available on most systems is a power Doppler display. This mode ignores the directional information provided by Doppler shift and displays the total Doppler signal strength as shades of one colour (Figure 7). Whilst it does not display any data on flow direction, power Doppler is a useful tool for examining low velocity blood flow and is more sensitive to flow than colour doppler.
...
To find the difference in time-of-flight between the two echoes:
...
Report requirements:
The report for this part is expected to include:
...