Using Field II Simulator, we want to simulate moving bubble movement. We simulate three different scenarios: Random Walk, Bubbles in Linear Vessels, Bubbles in Circular Vessels. Below simulation schema is valid for all three scenarios.
Simulation Scheme: There are 128 sensors evenly spaced. Width of each sensor is 0.27 mm and empty space between each sensor is 0.03 mm. We assume that there is no attenuation. Image has 50 mm depth(in z direction) and 38 mm width(in x direction). Bubble density is chosen as 260 bubbles per cm2. Transducer frequency is 5 Mhz. There is one single plane wave. Pixel sizes are \( \frac{ \lambda}{8} =0.0385 mm\) in x direction and \( \frac{ \lambda}{10} = 0.0308mm \) in z direction. Total number of pixels in x direction is 990 and total pixels in z direction is 1624.
1) Random Walk: First one is to simulate random walk. In this scenario, there is no blood vessel structure in the scene and the bubbles are moving randomly. Please download the below files to see an example case:
2) Bubbles in Linear Vessels: We implemented three types. In the first case, there is only one vessel and bubbles flowing with constant velocity inside the vessels. In the second case, there multiple parallel vessels with different velocities and so that bubbles are flowing with different velocities. In the third case, there are intersecting blood vessels. Please download the below files to see some example cases:
3) Bubbles in Circular Vessels: We implemented two types. In the first case, there is only one vessel and bubbles flowing with constant angular velocity inside the vessels. In the second case, there multiple vessels with the same angular velocities and so that bubbles are flowing with the same angular velocities. Please download the below files to see some example cases:
