Simulated VFI ultrasound data for a parabolic flow profile
The RF data was obtained from simulating the flow in a straigth tube
with a parabolic velocity profile by using the Field
II program. The data was then beamformed as described in [1], so they are
usable for vector flow imaging using the Transverse Oscillation (TO) method [1,2].
The data for the simulation are given below:
| Transducer: | 3 MHz, convex array probe with 64 active elements |
| Pulse repetition frequency: | 2.5 kHz |
| Angle between flow and beam: | 90° |
| Ultrasound pulse: | 4 cycles at 3 MHz |
| Axial sampling interval: | 0.0564 mm |
| Lateral sampling interval: | 0.1128 mm |
| Position of vessel center: | 49.2 mm from transducer surface |
| Vessel radius: | 6.0 mm |
| Peak velocity in vessel: | 0.4986 m/s |
| Depth of first sample point: | 40.2 mm from transducer surface |
| Depth of last sample point: | 58.2 mm from transducer surface |
The RF data can be obtained from the zip archives (512 MBytes):
https://courses.healthtech.dtu.dk/22485/files/ult_data/simulation/vfi_data/vfi_data_files.zip
Each of the files contains two variables: TO_data and axial_data. TO_data contains the transverse oscillation
data used for the tranverse velocity component. It is a three-dimensional structure
where the first index is depth, the second is sample number in the transverse signal, and the third index is the emission number.
axial_data contains the RF data in the axial direction and is a two-dimensional matrix, where the first index
is depth and the second is emission number. Each variable contains data fro 129 emissions.
The file is called TO_data_seq_01.mat, where
each file contains 129 emissions. There are 20 of these files of 01 to 20.
The various variables used in the simulation and beamforming can be found in
the file bft3_directional_flow_parameters.mat
References
[1] Jensen, JA 2017, 'Directional Transverse Oscillation Vector Flow Estimation',
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol 64, no. 8, pp. 1194-1204. DOI: 10.1109/TUFFC.2017.2710361
[2] Jensen, JA & Munk, P 1998, 'A New Method for Estimation of Velocity Vectors',
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol 45, no. 3, pp. 837-851. DOI: 10.1109/58.677749
[3] Jensen, JA 2001, 'A new estimator for vector velocity estimation',
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol 48, no. 4, pp. 886-894. DOI: 10.1109/58.935705
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