Comparison of Carotid Artery Blood Velocity Measurements by Vector and Standard Doppler Approaches

Tortoli, Piero; Lenge, Matteo; Righi, D.; Ciuti, Gabriele; Liebgott, Hervé; Ricci, Stefano

doi:10.1016/j.ultrasmedbio.2015.01.008

Cited by 66 publications

(53 citation statements)

References 35 publications

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“…The measurement of the peak velocity in veins by SDUS has limitations due to spectral broadening which may cause overestimation of the estimate 29 . Studies have indicated that TOUS underestimates flow velocities [19][20][21]30,31 .…”

Section: Discussionmentioning

confidence: 99%

Blood flow velocity in the popliteal vein using transverse oscillation ultrasound

et al. 2016

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Chronic venous disease is a common condition leading to varicose veins, leg edema, post-thrombotic syndrome and venous ulcerations. Ultrasound (US) is the main modality for examination of venous disease. Color Doppler and occasionally spectral Doppler US (SDUS) are used for evaluation of the venous flow. Peak velocities measured by SDUS are rarely used in a clinical setting for evaluating chronic venous disease due to inadequate reproducibility mainly caused by the angle dependency of the estimate. However, estimations of blood velocities are of importance in characterizing venous disease. Transverse Oscillation US (TOUS), a non-invasive angle independent method, has been implemented on a commercial scanner. TOUS's advantage compared to SDUS is a more elaborate visualization of complex flow. The aim of this study was to evaluate, whether TOUS perform equal to SDUS for recording velocities in the veins of the lower limbs. Four volunteers were recruited for the study. A standardized flow was provoked with a cuff compressiondecompression system placed around the lower leg. The average peak velocity in the popliteal vein of the four volunteers was 151.5 cm/s for SDUS and 105.9 cm/s for TOUS (p <0.001). The average of the peak velocity standard deviations (SD) were 17.0 cm/s for SDUS and 13.1 cm/s for TOUS (p <0.005). The study indicates that TOUS estimates lower peak velocity with improved SD when compared to SDUS. TOUS may be a tool for evaluation of venous disease providing quantitative measures for the evaluation of venous blood flow.

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Section: Discussionmentioning

confidence: 99%

Blood flow velocity in the popliteal vein using transverse oscillation ultrasound

et al. 2016

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“…TO is described thoroughly by Jensen, Munk and Udesen [8,9,10]. Vector velocity is a novel technique, and recent studies have indicated that TO is ready for clinical scanning [11][12][13][14][15]. Clinical TO examinations have until now been limited by the implementation, as TO only worked on a linear array transducer with a scan depth of approximately 60mm.…”

Section: Introductionmentioning

confidence: 99%

Velocity estimation of the main portal vein with Transverse Oscillation

Brandt

Hansen

Nielsen

et al. 2015

2015 IEEE International Ultrasonics Symposium (IUS)

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“…Peak systolic velocities were 77 and 82 cm s 21 with UIV and Doppler, respectively. The difference is likely to be due to the practical difficulty of aligning the transducer with the centre of the aorta and holding it steady, as well as the known errors in Doppler ultrasound; in vivo Doppler velocity measurement errors may be up to 75% even with an experienced sonographer [10,50]. Peak systolic flow was calculated to be 175 ml min 21 , within the range found for similar anaesthetized rabbits [51].…”

Section: In Vivo Experimentsmentioning

confidence: 75%

Ultrasound imaging velocimetry with interleaved images for improved pulsatile arterial flow measurements: a new correction method, experimental and in vivo validation

Fraser

Poelma

Zhou

et al. 2017

J. R. Soc. Interface.

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Blood velocity measurements are important in physiological science and clinical diagnosis. Doppler ultrasound is the most commonly used method but can only measure one velocity component. Ultrasound imaging velocimetry (UIV) is a promising technique capable of measuring two velocity components; however, there is a limit on the maximum velocity that can be measured with conventional hardware which results from the way images are acquired by sweeping the ultrasound beam across the field of view. Interleaved UIV is an extension of UIV in which two image frames are acquired concurrently, allowing the effective interframe separation time to be reduced and therefore increasing the maximum velocity that can be measured. The sweeping of the ultrasound beam across the image results in a systematic error which must be corrected: in this work, we derived and implemented a new velocity correction method which accounts for acceleration of the scatterers. We then, for the first time, assessed the performance of interleaved UIV for measuring pulsatile arterial velocities by measuring flows in phantoms and in vivo and comparing the results with spectral Doppler ultrasound and transit-time flow probe data. The velocity and flow rate in the phantom agreed within 5-10% of peak velocity, and 2-9% of peak flow, respectively, and in vivo the velocity difference was 9% of peak velocity. The maximum velocity measured was 1.8 m s 21 , the highest velocity reported with UIV. This will allow flows in diseased arteries to be investigated and so has the potential to increase diagnostic accuracy and enable new vascular research.

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Comparison of Carotid Artery Blood Velocity Measurements by Vector and Standard Doppler Approaches

Cited by 66 publications

References 35 publications

Blood flow velocity in the popliteal vein using transverse oscillation ultrasound

Blood flow velocity in the popliteal vein using transverse oscillation ultrasound

Velocity estimation of the main portal vein with Transverse Oscillation

Ultrasound imaging velocimetry with interleaved images for improved pulsatile arterial flow measurements: a new correction method, experimental and in vivo validation

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