Conventional ultrasound flow imaging systems are limited to estimate only the axial component of blood velocity. In this work, a method to produce 2D vector Doppler maps is proposed and experimentally tested. The local displacements between consecutive high frame-rate (HFR) radio-frequency (RF) images are estimated in the frequency domain. Each image is subdivided in partially overlapped matching blocks, and the average local displacements in a block are calculated from the difference of spectral phases in consecutive frames. The method has been tested by simulations and experiments by using the ULA-OP research scanner. Preliminary in-vivo tests have been conducted and an example of the femoral vessels of a healthy volunteer is presented. The performance of the method are evaluated through the relative error bias and standard deviation, presenting values lower than 10% in standard conditions.

Frequency-domain high frame-rate 2D vector flow imaging / M. Lenge; A. Ramalli; E. Boni; A. Cellai; H. Liebgott; C. Cachard; P. Tortoli. - STAMPA. - (2013), pp. 643-646. (Intervento presentato al convegno 2013 IEEE International Ultrasonics Symposium tenutosi a Praga nel July 2013) [10.1109/ULTSYM.2013.0166].

Frequency-domain high frame-rate 2D vector flow imaging

LENGE, MATTEO;RAMALLI, ALESSANDRO;BONI, ENRICO;CELLAI, ANDREA;TORTOLI, PIERO
2013

Abstract

Conventional ultrasound flow imaging systems are limited to estimate only the axial component of blood velocity. In this work, a method to produce 2D vector Doppler maps is proposed and experimentally tested. The local displacements between consecutive high frame-rate (HFR) radio-frequency (RF) images are estimated in the frequency domain. Each image is subdivided in partially overlapped matching blocks, and the average local displacements in a block are calculated from the difference of spectral phases in consecutive frames. The method has been tested by simulations and experiments by using the ULA-OP research scanner. Preliminary in-vivo tests have been conducted and an example of the femoral vessels of a healthy volunteer is presented. The performance of the method are evaluated through the relative error bias and standard deviation, presenting values lower than 10% in standard conditions.
2013
2013 IEEE International Ultrasonics Symposium Proceedings
2013 IEEE International Ultrasonics Symposium
Praga
July 2013
M. Lenge; A. Ramalli; E. Boni; A. Cellai; H. Liebgott; C. Cachard; P. Tortoli
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/828723
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