center for fast ultrasound imaging department of electrical engineering using phased array for...
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Center for Fast Ultrasound ImagingDepartment of Electrical Engineering
Using Phased Array for Transverse OscillationVector Velocity Imaging
Michael Johannes Pihl1, Per Haugaard2, and Jørgen Arendt Jensen1
1 Center for Fast Ultrasound Imaging, Building 349
Department of Electrical Engineering Technical University of Denmark
2 Bk Medical, Mileparken 34, 2730 Herlev Denmark
EUROSON 2010Copenhagen, August 22nd-25th, 2010
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Recap from previous talks
•Vector velocity imaging
•Shallow depths (< 3-4 cm)
QUESTIONS:
Can we get further down?
Can we scan the heart?
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Outline
•Simple principle
•TO setup for phased array
•Simulation setup
•Simulation results
•Conclusion
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Principle of transverse oscillation (TO)
Axial direction Transverse direction
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Principle of transverse oscillation (TO)
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
TO beamforming
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Phased array setupPhased array
Imagearea
TOlines
•2 TO lines
–Fixed angle
–>Spacing increases
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Simulation tool
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Simulation setup
Transducer (Phased array)Elements 128Pitch 0.220 mmCenter freq. 3.5 MHz
SystemPulse rep. freq. 5 kHzNo. shots per est. 64
BloodAngle 90 degreesSpeed 1 m/sRadius 5 mm
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Simulation results
•10 cm
Relative bias: 2.6%Relative std: 6.5%
20 realizations
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Simulation results
•15 cm
Relative bias: 4.2%Relative std: 8.5%
20 realizations
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Conclusion and perspectives
•In simulation: Measure velocities at to 10-15 cm
•Potential for getting that far down in clinical in-vivo measurements
•Clinical perspectives
– Insufficient heart valves
–AAAs
•Further development
–Through simulations
–Through measurements
–3D vector velocity imaging
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Acknowledgements
This work was supported by the Advanced Technology Foundation and B-K Medical Aps.
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Thank you for your attention
Questions?
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Clinical potential
•Vector velocity imaging
– Insufficient valves (in the heart)
–Abdominal aortic aneurisms
–Portal vein
–Renal artery
•Multigating
–Velocity and angle at every pixel
•Develop new quantitative measures