Vector methods based on the transmission of Plane Waves (PWs) produce impressive 2D maps of blood velocity. They are based on complex algorithms that process intensively huge amount of data. Producing 2D vector maps in real-time stresses the system hardware, limiting the achievable Pulse Repetition Frequency (PRF) which is frequently insufficient to measure, e.g., the blood velocities in stenoses, which may be higher than 2m/s. This work shows how the Multi Line Vector Doppler (MLVD) method, implemented on ULA-OP 256, overcomes part of the difficulties by using the new ‘Virtual Real-Time’ (VRT) processing architecture. In real-time, channel data are saved in the system memory, while in VRT data are re-processed from the memory as if they were coming from the probe. The ULA-OP 256 calculation power is used in real-time to achieve maximum PRF at the expenses of image quality, while in VRT the maximum image quality is restored as well. Experiments are reported where MLVD is shown capable of investigating flow jets up to 3 m/s with PRF of 16 kHz.
High velocity investigation with Multi Line Vector Doppler / Valentino Meacci, Stefano Ricci, Claudio Giangrossi, Riccardo Matera, Alessandro Dallai, Enrico Boni, Piero Tortoli. - ELETTRONICO. - (2019), pp. 360-363. (Intervento presentato al convegno 2019 IEEE Ultrasonics Symposium (IUS) tenutosi a Glasgow nel 6-9 ottobre 2019) [10.1109/ULTSYM.2019.8925613].
High velocity investigation with Multi Line Vector Doppler
Valentino MeacciMembro del Collaboration Group
;Stefano RicciMembro del Collaboration Group
;Claudio GiangrossiMembro del Collaboration Group
;Riccardo MateraMembro del Collaboration Group
;Alessandro DallaiMembro del Collaboration Group
;Enrico BoniMembro del Collaboration Group
;Piero TortoliSupervision
2019
Abstract
Vector methods based on the transmission of Plane Waves (PWs) produce impressive 2D maps of blood velocity. They are based on complex algorithms that process intensively huge amount of data. Producing 2D vector maps in real-time stresses the system hardware, limiting the achievable Pulse Repetition Frequency (PRF) which is frequently insufficient to measure, e.g., the blood velocities in stenoses, which may be higher than 2m/s. This work shows how the Multi Line Vector Doppler (MLVD) method, implemented on ULA-OP 256, overcomes part of the difficulties by using the new ‘Virtual Real-Time’ (VRT) processing architecture. In real-time, channel data are saved in the system memory, while in VRT data are re-processed from the memory as if they were coming from the probe. The ULA-OP 256 calculation power is used in real-time to achieve maximum PRF at the expenses of image quality, while in VRT the maximum image quality is restored as well. Experiments are reported where MLVD is shown capable of investigating flow jets up to 3 m/s with PRF of 16 kHz.
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