Using Phased Array for Transverse Oscillation Vector Velocity Imaging

Michael Johannes Pihl, Per Haugaard, Jørgen Arendt Jensen

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Abstract

Objective Previous in vivo measurements of superficial blood vessels using linear arrays have demonstrated that the Transverse Oscillation (TO) method is able to measure the lateral velocity component contrary to conventional velocity estimators. To broaden its usability, the method should be expanded to phased arrays enabling vector velocity imaging of the heart. Therefore, the performance of the TO estimator has to be evaluated for depths up to 10-15 cm. Methods The TO method is based on creating a double oscillating field. Flow phantoms were simulated with a transverse (90º) parabolic flow profile (peak = 1 m/s) and a vessel radius of 5 mm, and ‘scanned’ orthogonal to the flow with a 3.5 MHz phased array transducer. The performance of the lateral velocity estimates were evaluated by calculating the relative mean bias, Br, and relative mean standard deviation, σr, inside the vessel of N=20 realizations. Results With a F-number of 10 in transmit and receive peaks (spaced 96 elements apart) shaped as Hanning functions, parabolic velocity profiles were be observed for all cases. At depths of 10, 12, and 15 cm, the following results were obtained in pairs of σr & Br: 6.5% & 2.6%, 7.5% & 3.8%, and 8.5% & 4.2%, respectively. Conclusions The results show that the TO estimator performs comparably with a standard axial estimator at depths of 10-15 cm. This demonstrates the potential of the TO method for scanning the heart using a phased array.
Original languageEnglish
Publication date2010
Publication statusPublished - 2010
Event10th International Congress on Interventional Ultrasound - Copenhagen, Denmark
Duration: 22 Aug 201025 Aug 2010
Conference number: 10

Conference

Conference10th International Congress on Interventional Ultrasound
Number10
CountryDenmark
CityCopenhagen
Period22/08/201025/08/2010

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