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40-MHz high-frequency vector Doppler imaging for superficial venous valve flow estimation.
Med Phys. 2020 Jul 01 [Online ahead of print]MP

Abstract

PURPOSE

Doppler ultrasound imaging has been used widely for diagnosing vascular diseases. Recently, vector Doppler imaging (VDI) has been proposed for visualizing the blood flow in all directions to yield more detailed information for estimating flow conditions. Increasing the resolution of VDI is important for the structural mapping of superficial vessels with microstructure. However, VDI that operates under a high-frequency ultrasound (HFUS; >30 MHz) is rare. In this study, a 40-MHz high-frequency VDI (HFVDI) based on ultrafast ultrasound imaging was developed to obtain the vector information of blood flow around the superficial venous valve.

METHODS

The use of HFUS imaging system causes an overload of data acquisition easily. In order to provide sufficient recording time, the frame rate should be reduced. Because the aliasing problem worsens due to a low frame rate when operating Doppler imaging, phase-unwrapping processing methods based on spatial and temporal continuities were applied. Flow phantom experiments were performed to validate the accuracy. In vivo experiments were performed on the valve of superficial veins of healthy volunteers.

RESULTS

The experimental results from the phantom study indicated that the error of velocity estimation was <10% in most cases. Dynamic changes of valve movements and flow conditions (including velocity profiles and vector) were observed. Because of the high resolution of HFVDI, the jet and vortex phenomena were observed between the leaflets and in the sinus pocket, respectively.

CONCLUSIONS

Flow velocities ranging from 2 to 15 mm/s were measured at different locations around the venous valve during the opening and closing phases. All the results indicated that HFVDI has the potential to be a useful tool for vessel duplex scanning.

Authors+Show Affiliations

Department of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan.Department of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan.Department of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan. Medical Device Innovation Center, National Cheng Kung University, Tainan, Taiwan.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32609885

Citation

Huang, Hsin, et al. "40-MHz High-frequency Vector Doppler Imaging for Superficial Venous Valve Flow Estimation." Medical Physics, 2020.
Huang H, Chen PY, Huang CC. 40-MHz high-frequency vector Doppler imaging for superficial venous valve flow estimation. Med Phys. 2020.
Huang, H., Chen, P. Y., & Huang, C. C. (2020). 40-MHz high-frequency vector Doppler imaging for superficial venous valve flow estimation. Medical Physics. https://doi.org/10.1002/mp.14362
Huang H, Chen PY, Huang CC. 40-MHz High-frequency Vector Doppler Imaging for Superficial Venous Valve Flow Estimation. Med Phys. 2020 Jul 1; PubMed PMID: 32609885.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - 40-MHz high-frequency vector Doppler imaging for superficial venous valve flow estimation. AU - Huang,Hsin, AU - Chen,Pei-Yu, AU - Huang,Chih-Chung, Y1 - 2020/07/01/ PY - 2020/03/31/received PY - 2020/05/26/revised PY - 2020/06/17/accepted PY - 2020/7/2/pubmed PY - 2020/7/2/medline PY - 2020/7/2/entrez KW - blood flow measurement KW - high-frequency ultrasound KW - ultrafast ultrasound imaging KW - vector Doppler imaging KW - venous valve JF - Medical physics JO - Med Phys N2 - PURPOSE: Doppler ultrasound imaging has been used widely for diagnosing vascular diseases. Recently, vector Doppler imaging (VDI) has been proposed for visualizing the blood flow in all directions to yield more detailed information for estimating flow conditions. Increasing the resolution of VDI is important for the structural mapping of superficial vessels with microstructure. However, VDI that operates under a high-frequency ultrasound (HFUS; >30 MHz) is rare. In this study, a 40-MHz high-frequency VDI (HFVDI) based on ultrafast ultrasound imaging was developed to obtain the vector information of blood flow around the superficial venous valve. METHODS: The use of HFUS imaging system causes an overload of data acquisition easily. In order to provide sufficient recording time, the frame rate should be reduced. Because the aliasing problem worsens due to a low frame rate when operating Doppler imaging, phase-unwrapping processing methods based on spatial and temporal continuities were applied. Flow phantom experiments were performed to validate the accuracy. In vivo experiments were performed on the valve of superficial veins of healthy volunteers. RESULTS: The experimental results from the phantom study indicated that the error of velocity estimation was <10% in most cases. Dynamic changes of valve movements and flow conditions (including velocity profiles and vector) were observed. Because of the high resolution of HFVDI, the jet and vortex phenomena were observed between the leaflets and in the sinus pocket, respectively. CONCLUSIONS: Flow velocities ranging from 2 to 15 mm/s were measured at different locations around the venous valve during the opening and closing phases. All the results indicated that HFVDI has the potential to be a useful tool for vessel duplex scanning. SN - 2473-4209 UR - https://www.unboundmedicine.com/medline/citation/32609885/40-MHz_High-Frequency_Vector_Doppler_Imaging_for_Superficial_Venous_Valve_Flow_Estimation L2 - https://doi.org/10.1002/mp.14362 DB - PRIME DP - Unbound Medicine ER -
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