Velocity estimation of the main portal vein with Transverse Oscillation

Brandt, Andreas Hjelm; Hansen, Kristoffer Lindskov; Nielsen, Michael Bachmann; Jensen, Jørgen Arendt

doi:10.1109/ultsym.2015.0068

Cited by 9 publications

(10 citation statements)

References 18 publications

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“…In this study, it was found that VFI underestimated peak velocity compared with venous peak velocity measurements obtained with SDUS. This is in accordance with previously published work indicating that peak systolic velocity was lower in the carotid artery (Pedersen et al 2012) and the portal vein compared with SDUS (Brandt et al 2015) as well as in the ascending aorta compared with SDUS using transesophageal echocardiography (Hansen et al 2013). It is, however, also known that SDUS overestimates peak velocities because of intrinsic spectral broadening (Tortoli et al 2015).…”

Section: Discussionsupporting

confidence: 92%

“…In addition to venous disorders, VFI could also play a role in examination of the carotid and femoral arteries, in cardiology and in abdominal ultrasound, all areas recently examined with VFI (Brandt et al 2015;Hansen et al 2015bHansen et al , 2016Hansen et al , 2017bPedersen et al 2012). The vessels in the thorax and abdomen are deeply located and examined with phased and convex arrays respectively, which means that electronic beam-to-flow angle correction may be limited, and valid velocity estimates may be difficult to attain with SDUS.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Vector and Doppler Ultrasound Velocities Evaluated in a Flow Phantom and the Femoropopliteal Vein

Bechsgaard

Hansen

Brandt

et al. 2017

Ultrasound in Medicine & Biology

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Ultrasound is used for evaluating the veins of the lower extremities. Operator and angle dependency limit spectral Doppler ultrasound (SDUS). The aim of the study was to compare peak velocity measurements in a flow phantom and the femoropopliteal vein of 20 volunteers with the angle-independent vector velocity technique vector flow imaging (VFI) and SDUS. In the flow phantom, VFI underestimated velocity (p = 0.01), with a lower accuracy of 5.5% (p = 0.01) and with no difference in precision, that is, error factor, compared with SDUS (VFI: 1.02 vs. SDUS: 1.02, p = 0.58). In vivo, VFI estimated lower velocities (femoral: p = 0.001; popliteal: p = 0.001) with no difference in precision compared with SDUS (femoral: VFI 1.09 vs. SDUS 1.14, p = 0.37; popliteal: VFI 1.13 vs. SDUS 1.06, p = 0.09). In conclusion, the precise VFI technique can be used to characterize venous hemodynamics of the lower extremities despite its underestimation of velocities.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Vector and Doppler Ultrasound Velocities Evaluated in a Flow Phantom and the Femoropopliteal Vein

Bechsgaard

Hansen

Brandt

et al. 2017

Ultrasound in Medicine & Biology

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“…Complex flow is more elaborately visualized with TOUS compared to SDUS which is an advantage of the technique. The method has been assessed in different regions such as, the portal vein, the ascending aorta and arteriovenous fistulas for hemodialysis [19][20][21][22] . Venous flow in lower limbs has only been characterized with vector velocity US in a single report using plane wave imaging with an experimental scanner 23 .…”

Section: Introductionmentioning

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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“…Brandt et al [182] scanned the portal vein in the liver in subcostal and intercostal views and compared it to traditional spectral velocity estimation for finding the peak velocity. The scans were conducted on ten healthy volunteers over 3-5 heart beats.…”

Section: H Arterial Flow Patterns and Wall Shear Ratesmentioning

confidence: 99%

Ultrasound Vector Flow Imaging: I: Sequential Systems

Jensen

Nikolov²,

et al. 2016

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

108

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Abstract-The paper gives a review of the most important methods for blood velocity vector flow imaging (VFI) for conventional, sequential data acquisition. This includes multibeam methods, speckle tracking, transverse oscillation, color flow mapping derived vector flow imaging, directional beamforming, and variants of these. The review covers both 2-D and 3-D velocity estimation and gives a historical perspective on the development along with a summary of various vector flow visualization algorithms. The current state-of-the-art is explained along with an overview of clinical studies conducted and methods for presenting and using VFI. A number of examples of VFI images are presented, and the current limitations and potential solutions are discussed.

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Velocity estimation of the main portal vein with Transverse Oscillation

Cited by 9 publications

References 18 publications

Vector and Doppler Ultrasound Velocities Evaluated in a Flow Phantom and the Femoropopliteal Vein

Vector and Doppler Ultrasound Velocities Evaluated in a Flow Phantom and the Femoropopliteal Vein

Blood flow velocity in the popliteal vein using transverse oscillation ultrasound

Ultrasound Vector Flow Imaging: I: Sequential Systems

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