Vector doppler imaging and secondary flow patterns in vascular prostheses

TY - GEN

T1 - Vector doppler imaging and secondary flow patterns in vascular prostheses

AU - Kokkalis, E.

AU - Hoskins, P. R.

AU - Corner, G. A.

AU - Stonebridge, P. A.

AU - Doull, A. J.

AU - Melzer, A.

AU - Houston, G. J.

PY - 2012

Y1 - 2012

N2 - Flow patterns created by vascular prostheses designed to induce spiral flow, were compared against standard plain grafts using an in-house ultrasound flow phantom. Color Doppler and vector Doppler imaging were applied to visualize and quantify secondary flow motions distally to the grafts outflow. The flow phantom incorporates a piston pump, blood mimic fluid, vessel mimicking tubing consisting of polyvinyl alcohol, in 9% glycerol solution. Spiral Laminar Flow™ Peripheral Vascular (PV) and Access Vascular (AV) grafts (Vascular Flow Technologies, Dundee, UK) were compared with standard control PV and AV grafts. Steady flow rates up to 720 ml min were applied. Color Doppler cine loops were acquired from the left (? = 20) and right (? =-20) projection, with the transducer positioned transverse to the flow direction. The velocity data was subjected to triangulation in order to generate in-plane velocity magnitude and direction maps. Complicated rotational patterns were detected in the connection between the graft and the vessel mimic, with a prevalent single helix for the spiral prostheses and a prevalent double helix for the control devices. A clear single spiral pattern was found distally of the spiral grafts and a double distally of the standard devices. The magnitude of the radial component velocity distally from the PV spiral graft, was found to be significantly higher (p <0.05) compared to the control device. This study compared different vascular graft designs in terms of their outflow patterns, using a dual-beam color Doppler mapping.

AB - Flow patterns created by vascular prostheses designed to induce spiral flow, were compared against standard plain grafts using an in-house ultrasound flow phantom. Color Doppler and vector Doppler imaging were applied to visualize and quantify secondary flow motions distally to the grafts outflow. The flow phantom incorporates a piston pump, blood mimic fluid, vessel mimicking tubing consisting of polyvinyl alcohol, in 9% glycerol solution. Spiral Laminar Flow™ Peripheral Vascular (PV) and Access Vascular (AV) grafts (Vascular Flow Technologies, Dundee, UK) were compared with standard control PV and AV grafts. Steady flow rates up to 720 ml min were applied. Color Doppler cine loops were acquired from the left (? = 20) and right (? =-20) projection, with the transducer positioned transverse to the flow direction. The velocity data was subjected to triangulation in order to generate in-plane velocity magnitude and direction maps. Complicated rotational patterns were detected in the connection between the graft and the vessel mimic, with a prevalent single helix for the spiral prostheses and a prevalent double helix for the control devices. A clear single spiral pattern was found distally of the spiral grafts and a double distally of the standard devices. The magnitude of the radial component velocity distally from the PV spiral graft, was found to be significantly higher (p <0.05) compared to the control device. This study compared different vascular graft designs in terms of their outflow patterns, using a dual-beam color Doppler mapping.

UR - https://www.scopus.com/pages/publications/84882385709

U2 - 10.1109/ULTSYM.2012.0475

DO - 10.1109/ULTSYM.2012.0475

M3 - Conference contribution

AN - SCOPUS:84882385709

SN - 9781467345613

BT - Ultrasonics Symposium (IUS), 2012 IEEE International

PB - IEEE

T2 - 2012 IEEE International Ultrasonics Symposium (IUS)

Y2 - 7 October 2012 through 10 October 2012

ER -