Vector Doppler: spatial sampling analysis and presentation techniques for real-time systems

Lorenzo Capineri; Marco Scabia; Leonardo F. Masotti

doi:10.1117/12.428201

30 May 2001 Vector Doppler: spatial sampling analysis and presentation techniques for real-time systems

Lorenzo Capineri, Marco Scabia, Leonardo F. Masotti

Author Affiliations +

Proceedings Volume 4325, Medical Imaging 2001: Ultrasonic Imaging and Signal Processing; (2001) https://doi.org/10.1117/12.428201
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

Abstract

The aim of the vector Doppler (VD) technique is the quantitative reconstruction of a velocity field independently of the ultrasonic probe axis to flow angle. In particular vector Doppler is interesting for studying vascular pathologies related to complex blood flow conditions. Clinical applications require a real-time operating mode and the capability to perform Doppler measurements over a defined volume. The combination of these two characteristics produces a real-time vector velocity map. In previous works the authors investigated the theory of pulsed wave (PW) vector Doppler and developed an experimental system capable of producing off-line 3D vector velocity maps. Afterwards, for producing dynamic velocity vector maps, we realized a new 2D vector Doppler system based on a modified commercial echograph. The measurement and presentation of a vector velocity field requires a correct spatial sampling that must satisfy the Shannon criterion. In this work we tackled this problem, establishing a relationship between sampling steps and scanning system characteristics. Another problem posed by the vector Doppler technique is the data representation in real-time that should be easy to interpret for the physician. With this in mine we attempted a multimedia solution that uses both interpolated images and sound to represent the information of the measured vector velocity map. These presentation techniques were experimented for real-time scanning on flow phantoms and preliminary measurements in vivo on a human carotid artery.

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Lorenzo Capineri, Marco Scabia, and Leonardo F. Masotti "Vector Doppler: spatial sampling analysis and presentation techniques for real-time systems", Proc. SPIE 4325, Medical Imaging 2001: Ultrasonic Imaging and Signal Processing, (30 May 2001); https://doi.org/10.1117/12.428201

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KEYWORDS

Doppler effect

Transducers

Spatial resolution

3D acquisition

Visualization

3D image processing

Electronics

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