In vivo high frame rate vector flow imaging using plane waves and directional beamforming
Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review
Directional beamforming (DB) estimates blood flow velocities accurately when the flow angle is known. However, for automatically finding the flow angle a computationally expensive approach is used. This work presents a method for estimating the flow angle using a combination of inexpensive transverse oscillation (TO) estimators and only 3 directional beamformed lines. The suggested DB vector flow estimator is employed with steered plane wave transmissions for high frame rate imaging. Two distinct plane wave sequences are used: a short sequence (3 angles) for fast flow and an interleaved long sequence (21 angles) for both slow flow and B-mode. Parabolic flow with a peak velocity of 0.5 m/s is measured at beam-to-flow angles of 60° and 90°. The DB method estimates the angle with a bias and standard deviation (STD) less than 2°, and the STD of the velocity magnitude is 2.5 %. This is 7 - 8.5 % when using TO. The long sequence has a higher sensitivity, and when used for estimation of slow flow with a peak velocity of 0.04 m/s, the SD is 2.5 % and bias is 0.1 %. This is a factor of 4 better than if the short sequence is used. The carotid bifurcation was scanned on a healthy volunteer, and the short sequence was used with TO and DB to estimate velocity vectors. The STD of the velocity profile over a cardiac cycle was 6.1 % for TO and 4.9 % for DB.
|Title of host publication||2016 IEEE International Ultrasonics Symposium, IUS 2016|
|Number of pages||4|
|Publisher||IEEE Computer Society Press|
|Publication date||1 Nov 2016|
|Publication status||Published - 1 Nov 2016|
|Event||2016 IEEE International Ultrasonics Symposium, IUS 2016 - Tours, France|
Duration: 18 Sep 2016 → 21 Sep 2016
|Conference||2016 IEEE International Ultrasonics Symposium, IUS 2016|
|Periode||18/09/2016 → 21/09/2016|
|Series||IEEE International Ultrasonics Symposium, IUS|
© 2016 IEEE.