title: Two-dimensional color Doppler flow velocity profiles can be time corrected with an external ECG-delay device.
abstract: Although two-dimensional ultrasound color flow imaging is often considered to be a real-time technique, the acquisition time for two-dimensional color images may be up to 200 msec. Time correction is therefore necessary to obtain correct flow velocity profiles. We have developed a time-correction method in which a specially designed unit detects the QRS complex from the patient and creates a trig pulse that is delayed incrementally in relation to the QRS complex. This trig pulse controls the acquisition of the ultrasound images. A number of consecutively delayed images, with known incremental delay between the sweeps, can thus be stored in the memory of the echocardiograph and transferred digitally to a computer. The time-corrected flow velocity profile is obtained by interpolation of data from the time-delayed profiles. The system was evaluated in a Doppler string phantom test. With this technique it is possible to study time-corrected flow velocity profiles without the need to alter existing ultrasound Doppler equipment.
authors.affiliation: Department of Biomedical Engineering, University of Linköping, Sweden.
authors.forename: L
authors.initials: L
authors.lastname: Eidenvall
authors.forename: B J
authors.initials: BJ
authors.lastname: Sjöberg
authors.forename: P
authors.initials: P
authors.lastname: Ask
authors.forename: D
authors.initials: D
authors.lastname: Loyd
authors.forename: B
authors.initials: B
authors.lastname: Wranne
mesh_terms: D001783:Blood Flow Velocity; D015150:Echocardiography, Doppler / Q000379:methods*; D004562:Electrocardiography / Q000295:instrumentation*; D006801:Humans; D012815:Signal Processing, Computer-Assisted; D013995:Time