Do ultrasonic contrast agents artificially increase maximum Doppler shift? In vivo study of human common carotid arteries.

1998 ◽  
Vol 17 (2) ◽  
pp. 97-102 ◽  
Author(s):  
M Gutberlet ◽  
S Venz ◽  
W Zendel ◽  
N Hosten ◽  
R Felix
Keyword(s):  
Contrast Agents ◽  
Doppler Shift ◽  
Carotid Arteries ◽  
In Vivo Study ◽  
Common Carotid Arteries

scholarly journals Design and Implementation of a New Wireless Carotid Neckband Doppler System with Wearable Ultrasound Sensors: Preliminary Results

2019 ◽  
Vol 9 (11) ◽  
pp. 2202 ◽  
Author(s):  
Ilseob Song ◽  
Jongmin Yoon ◽  
Jinbum Kang ◽  
Min Kim ◽  
Won Seuk Jang ◽  
...  
Keyword(s):  
Blood Flow ◽  
Carotid Arteries ◽  
Peak Systolic Velocity ◽  
Resistive Index ◽  
Flow Dynamics ◽  
Doppler System ◽  
Doppler Signals ◽  
Blood Flow Dynamics ◽  
Common Carotid Arteries

Noninvasive monitoring of blood flow in the carotid artery is important for evaluating not only cerebrovascular but also cardiovascular diseases. In this paper, a wireless neckband ultrasound Doppler system, in which two 2.5-MHz ultrasonic sensors are utilized for acquiring Doppler signals from both carotid arteries, is presented for continuously evaluating blood flow dynamics. In the developed wireless neckband Doppler system, the acquired Doppler signals are quantized by 14-bit analog-to-digital-converters running at 40 MHz, and pre-processing operations (i.e., demodulation and clutter filtering) are performed in an embedded field programmable gate array chip. Then, these data are transferred to an external smartphone (i.e., Galaxy S7, Samsung Electronics Co., Suwon, Korea) via Bluetooth 2.0. Post-processing (i.e., Fourier transform and image processing) is performed using an embedded application processor in the smartphone. The developed carotid neckband Doppler system was evaluated with phantom and in vivo studies. In a phantom study, the neckband Doppler system showed comparable results with a commercial ultrasound machine in terms of peak systolic velocity and resistive index, i.e., 131.49 ± 3.97 and 0.75 ± 0.02 vs. 131.89 ± 2.06 and 0.74 ± 0.02, respectively. In addition, in the in vivo study, the neckband Doppler system successfully demonstrated its capability to continuously evaluate hemodynamics in both common carotid arteries. These results indicate that the developed wireless neckband Doppler system can be used for continuous monitoring of blood flow dynamics in the common carotid arteries in point-of-care settings.

The mechanical properties of exposed human common carotid arteries in vivo

1979 ◽  
Vol 74 (5) ◽  
pp. 545-554 ◽  
Author(s):  
R. Busse ◽  
R. D. Bauer ◽  
A. Schabert ◽  
Y. Summa ◽  
P. Bumm ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carotid Arteries ◽  
Common Carotid Arteries

scholarly journals Neuroendovascular Optical Coherence Tomography Imaging and Histological Analysis

Neurosurgery ◽  
2011 ◽  
Vol 69 (2) ◽  
pp. 430-439 ◽  
Author(s):  
Marlon S. Mathews ◽  
Jianping Su ◽  
Esmaeil Heidari ◽  
Elad I. Levy ◽  
Mark E. Linskey ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
High Resolution ◽  
Carotid Arteries ◽  
Ex Vivo ◽  
Infrared Light ◽  
Optical Coherence ◽  
The Common ◽  
Oct Imaging ◽  
Common Carotid Arteries

Abstract BACKGROUND: Intravascular optical coherence tomography (OCT) is a recently developed optical imaging technique that provides high-resolution cross-sectional in situ images from intact tissue based on tissue reflectance of near-infrared or infrared light. OBJECTIVE: To report on the feasibility of neuroendovascular OCT imaging and compare the neuroendovascular OCT findings with histology in nondiseased vessels in an animal, cadaveric, and clinical study. METHODS: Catheter-based in vivo endovascular OCT imaging was performed in the common carotid arteries of 2 pigs and in the intracranial carotid arteries of 3 patients. The endovascular OCT device was delivered to the desired location via groin access and using standard endovascular procedures. Images were obtained via rotational and translational scanning using external motors. In vivo findings were reproduced using ex vivo OCT imaging in corresponding animal and human (cadaveric) harvested tissue segments. These segments underwent histological examination for comparison. RESULTS: The structural compositions of the OCT-imaged segments of the common carotid arteries in pigs as well as the petrous and cavernous intracranial carotid arteries in patients were visualized at high resolution (8 μm). The in vivo images were identical to those obtained ex vivo, demonstrating the imaging capabilities of the endovascular OCT device. The OCT images correlated well with the images obtained after histological sectioning and visualized in vivo the laminar vascular structure. CONCLUSION: Neuroendovascular OCT imaging is feasible for clinical use and can detect with high resolution the structure of arterial segments. Understanding OCT imaging in nondiseased arteries is important in establishing baseline findings necessary for interpreting pathological processes. This allows neuroendovascular optical biopsies of vascular tissue to be obtained without the need for excision and processing.

Time-lag combination therapy for cerebral ischemia using the FNK protein transduction technology and an immunosuppressant, I: In vivo study

2005 ◽  
Vol 25 (1_suppl) ◽  
pp. S57-S57
Author(s):  
Ken-ichiro Kasura ◽  
Megumi Watanabe ◽  
Kumiko Takahashi ◽  
Genki Mizukoshi ◽  
Seiji Ohkubo ◽  
...  
Keyword(s):  
Cerebral Ischemia ◽  
Combination Therapy ◽  
Time Lag ◽  
In Vivo Study ◽  
Protein Transduction
Sign in / Sign up

Export Citation Format

Share Document