A New Velocity Estimator for Color Flow Mapping

Bonnefous, O.; Pesqué, P.; Bernard, Xavier

doi:10.1109/ultsym.1986.198856

Cited by 51 publications

(21 citation statements)

References 17 publications

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“…Although methods based on measuring the rates of change of phase and particularly autocorrelation methods are now widely used in commercial machines, colour flow mapping can also be implemented using time domain-based techniques such as cross-correlation [36][37][38][39]. These techniques are based on measuring changes in the round-trip time from the transducer to a defined group of scatterers (identified by their scattering signature).…”

Section: ð3:9þmentioning

confidence: 99%

Ultrasonic colour Doppler imaging

2011

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Ultrasonic colour Doppler is an imaging technique that combines anatomical information derived using ultrasonic pulse-echo techniques with velocity information derived using ultrasonic Doppler techniques to generate colour-coded maps of tissue velocity superimposed on grey-scale images of tissue anatomy. The most common use of the technique is to image the movement of blood through the heart, arteries and veins, but it may also be used to image the motion of solid tissues such as the heart walls. Colour Doppler imaging is now provided on almost all commercial ultrasound machines, and has been found to be of great value in assessing blood flow in many clinical conditions. Although the method for obtaining the velocity information is in many ways similar to the method for obtaining the anatomical information, it is technically more demanding for a number of reasons. It also has a number of weaknesses, perhaps the greatest being that in conventional systems, the velocities measured and thus displayed are the components of the flow velocity directly towards or away from the transducer, while ideally the method would give information about the magnitude and direction of the three-dimensional flow vectors. This review briefly introduces the principles behind colour Doppler imaging and describes some clinical applications. It then describes the basic components of conventional colour Doppler systems and the methods used to derive velocity information from the ultrasound signal. Next, a number of new techniques that seek to overcome the vector problem mentioned above are described. Finally, some examples of vector velocity images are presented.

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Section: ð3:9þmentioning

confidence: 99%

Ultrasonic colour Doppler imaging

2011

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“…High dynamic range is, however, not needed, since we intend to perform cross-correlation between consecutive speckle images. Cross-correlation is more sensitive to phase than to amplitude and is known to give good results even with 1-bit data [9]. The PBF is performed on a PC and it takes a few seconds per frame.…”

Section: Parallel Beam-formingmentioning

confidence: 99%

Ultrasonic speckle correlation imaging of 2D particle velocity profiles in multiphase flows

Carlson

Ing

2003

Flow Measurement and Instrumentation

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Two-dimensional ultrasonic speckle correlation velocimetry (USV) is a new technique that allows imaging of moving scattering media, at a high frame-rate. In this paper we apply the technique to determine two-dimensional particle velocity profiles of multiphase flows. Experiments are realized with suspensions of Sonazoid (medical contrast agent) and Magnetite (Fe 3 O 4 ) in water. All measurements are performed in a vertical pipe with the flow moving downwards. The two-dimensional particle velocity profiles are then compared with a reference liquid volume flow velocity. As expected from theory, the heavier Magnetite particles have slightly higher velocity than the liquid, whereas the contrast agent simply follows the liquid motion.The proposed technique can be used in combination with other techniques to measure the mass flow of the solid phase, in solid/liquid multiphase flow. This is generally more interesting than measuring the bulk mass or volume flow. 

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“…It is possible to find the shift in position of the scatterers, when they move between pulses by more than half a wavelength in the beam direction. A technique for doing that using cross-correlation has been suggested by a number of authors (Dotti et al 1976;Bonnefous et al 1986;Foster et al 1990). In this method the high frequency transducer signal is sampled following consecutive transmitted pulses.…”

Section: Traditional Range/velocity Limitationmentioning

confidence: 99%

Range/velocity limitations for time-domain blood velocity estimation

Jensen

1993

Ultrasound in Medicine & Biology

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Abstract--The traditional range/velocity limitation for blood velocity estimation systems using ultrasound is elucidated. It is stated that the equation is a property of the estimator used, not the actual physical measurement situation, as higher velocities can be estimated by the time domain cross-correlation approach. It is demonstrated that the time domain technique under certain measurement conditions will yield unsatisfactory results, when trying to estimate high velocities. Various methods to avoid these artifacts using temporal and spatial clustering techniques are suggested. The improvement in probability of correct detection is derived, and several examples of simulations are shown.

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A New Velocity Estimator for Color Flow Mapping

Cited by 51 publications

References 17 publications

Ultrasonic colour Doppler imaging

Ultrasonic colour Doppler imaging

Ultrasonic speckle correlation imaging of 2D particle velocity profiles in multiphase flows

Range/velocity limitations for time-domain blood velocity estimation

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