center for fast ultrasound imaging department of electrical engineering using phased array for...
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![Page 1: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/1.jpg)
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
![Page 2: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/2.jpg)
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?
![Page 3: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/3.jpg)
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
![Page 4: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/4.jpg)
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Principle of transverse oscillation (TO)
Axial direction Transverse direction
![Page 5: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/5.jpg)
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Principle of transverse oscillation (TO)
![Page 6: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/6.jpg)
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
TO beamforming
![Page 7: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/7.jpg)
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
![Page 8: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/8.jpg)
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Simulation tool
![Page 9: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/9.jpg)
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
![Page 10: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/10.jpg)
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
![Page 11: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/11.jpg)
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
![Page 12: Center for Fast Ultrasound Imaging Department of Electrical Engineering Using Phased Array for Transverse Oscillation Vector Velocity Imaging Michael Johannes](https://reader035.vdocuments.us/reader035/viewer/2022081519/56649f465503460f94c68be6/html5/thumbnails/12.jpg)
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
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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.
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Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Thank you for your attention
Questions?
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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