Experimental study on the association among flow profile shape, systemic and local hemodynamics, wave reflections, based on Vector Doppler imaging

2021 ◽  
Author(s):  
Stefano Ricci ◽  
Carmela Morizzo ◽  
Daniele Mazierli ◽  
Piero Tortoli ◽  
Michaela Kozakova ◽  
...  
Keyword(s):  
Experimental Study ◽  
Doppler Imaging ◽  
Flow Profile ◽  
Wave Reflections ◽  
Profile Shape

scholarly journals A Detailed Numerical, Graphical, and Experimental Study of ObliqueShock Wave Reflections

1985 ◽  
Author(s):  
H.M. Glaz ◽  
P. Colella ◽  
I.I. Glass ◽  
R.L. Deschambault
Keyword(s):  
Experimental Study ◽  
Wave Reflections

Doppler Angiography for the Non-Invasive Investigation of the Carotid Artery in the Neck

1979 ◽  
Author(s):  
Charles Warlow ◽  
Peter Fish
Keyword(s):  
Carotid Artery ◽  
Carotid Arteries ◽  
Internal Carotid ◽  
Doppler Imaging ◽  
Ultra Sound ◽  
External Carotid ◽  
Flow Profile ◽  
Non Invasive ◽  
Velocity Flow ◽  
Internal Carotid Arteries

The accuracy, and possible clinical application of non-invasive ultra sound imaging of the cervical carotid, artery in patients with cerebrovascular disease has been investigated by comparing a pulsed multi-channel directional Doppler imaging devise (“MAVIS” - GEC Medical) with conventional carotid angiography. Of 23 normal or minimally diseased internal carotid arteries only 4 appeared as stenosed on Doppler angiography, the other 19 were normal; of 14 stenosed arteries only 1 appeared normal on imaging,1 appeared occluded end 12 showed clear images of stenosis; all 6 occluded arteries appeared occluded on ultra sound imaging. It was difficult to obtain satisfactory images of the external carotid arteries in all cases. The additional facility to display a velocity flow profile at preselected points along the arterialimage should increase the usefulness of this technique, particularly when there is only minor atheromatous irregularity or ulceration, and such a device will be briefly disrussed.

Doppler Angiography for the Non-Invasive Investigation of the Carotid Artery in the Neck

1979 ◽  
Author(s):  
Charles Warlow ◽  
Peter Fish
Keyword(s):  
Carotid Artery ◽  
Carotid Arteries ◽  
Internal Carotid ◽  
Doppler Imaging ◽  
Ultra Sound ◽  
External Carotid ◽  
Flow Profile ◽  
Non Invasive ◽  
Velocity Flow ◽  
Internal Carotid Arteries

The accuracy, and possible clinical application of non-invasive ultra sound imaging of the cervical carotid artery in patients with cerebrovascular disease has been investigated by comparing a pulsed multi-channel directional Doppler imaging devise (“MAVIS” - GEC Medical) with conventional carotid angiography. of 23 normal or minimally diseased internal carotid arteries only 4 appeared as stenosed on Doppler angiography, the other 19 were normal; of 14 stenosed arteries only 1 appeared normal on imaging, 1 appeared occluded and 12 showed clear images of stenosis; all 6 occluded arteries appeared occluded on ultra sound imaging. It was difficult to obtain satisfactory images of the external carotid arteries in all cases. The additional facility to display a velocity flow profile at preselected points along the arterial image should increase the usefulness of this technique, particularly when there is only minor atheromatous irregularity or ulceration, and such a device will be briefly discussed.

scholarly journals Reliability of Vessel Diameter Measurements Using Power Doppler Imaging: Experimental Study with Doppler Phantom.

Neurosonology ◽  
1998 ◽  
Vol 11 (4) ◽  
pp. 176-182
Author(s):  
Ge DAMRINJAB ◽  
Toshiyuki SHIOGAI ◽  
Kazuki NAGAYAMA ◽  
Mitsuhiro HARA ◽  
Isamu SAITO ◽  
...  
Keyword(s):  
Experimental Study ◽  
Power Doppler ◽  
Vessel Diameter ◽  
Doppler Imaging ◽  
Power Doppler Imaging

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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