To assess the intimal thickness, flow velocities, and luminal diameter of carotid arteries using high-resolution B-mode ultrasound doppler imaging

2004 ◽  
Author(s):  
Madhuri Vemuru ◽  
Afzal Jabbar ◽  
Suman Chandra
Keyword(s):  
High Resolution ◽  
Carotid Arteries ◽  
Doppler Imaging ◽  
Luminal Diameter ◽  
Ultrasound Doppler ◽  
Intimal Thickness ◽  
Flow Velocities

scholarly journals Ultrasound Doppler-guided real-time navigation of a magnetic microswarm for active endovascular delivery

2021 ◽  
Vol 7 (9) ◽  
pp. eabe5914 ◽  
Author(s):  
Qianqian Wang ◽  
Kai Fung Chan ◽  
Kathrin Schweizer ◽  
Xingzhou Du ◽  
Dongdong Jin ◽  
...  
Keyword(s):  
Blood Flow ◽  
Real Time ◽  
Targeted Delivery ◽  
Ex Vivo ◽  
Dynamic Environments ◽  
Doppler Imaging ◽  
Great Promise ◽  
Mean Velocity ◽  
Ultrasound Doppler ◽  
Flowing Blood

Swarming micro/nanorobots offer great promise in performing targeted delivery inside diverse hard-to-reach environments. However, swarm navigation in dynamic environments challenges delivery capability and real-time swarm localization. Here, we report a strategy to navigate a nanoparticle microswarm in real time under ultrasound Doppler imaging guidance for active endovascular delivery. A magnetic microswarm was formed and navigated near the boundary of vessels, where the reduced drag of blood flow and strong interactions between nanoparticles enable upstream and downstream navigation in flowing blood (mean velocity up to 40.8 mm/s). The microswarm-induced three-dimensional blood flow enables Doppler imaging from multiple viewing configurations and real-time tracking in different environments (i.e., stagnant, flowing blood, and pulsatile flow). We also demonstrate the ultrasound Doppler–guided swarm formation and navigation in the porcine coronary artery ex vivo. Our strategy presents a promising connection between swarm control and real-time imaging of microrobotic swarms for localized delivery in dynamic environments.

Pulpal Blood Flow Measurement with Ultrasound Doppler Imaging

2010 ◽  
Vol 36 (3) ◽  
pp. 419-422 ◽  
Author(s):  
Min-Jung Yoon ◽  
Euiseong Kim ◽  
Seoung-Jong Lee ◽  
Young-Min Bae ◽  
Sergey Kim ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Measurement ◽  
Doppler Imaging ◽  
Blood Flow Measurement ◽  
Ultrasound Doppler ◽  
Pulpal Blood Flow

Detection of normal mediastinal lymph nodes by ultrasonography

1997 ◽  
Vol 38 (6) ◽  
pp. 965-969 ◽  
Author(s):  
C. F. Dietrich ◽  
M. Liesen ◽  
R. Buhl ◽  
G. Herrmann ◽  
J. Kirchner ◽  
...  
Keyword(s):  
High Resolution ◽  
Lymph Nodes ◽  
Pathological Finding ◽  
Doppler Imaging ◽  
Colour Doppler Imaging ◽  
Asymptomatic Volunteers ◽  
Human Cadavers ◽  
Mean Size ◽  
Almost All ◽  
Node Diameter

Purpose: the detection by US (ín contrast to CT) of lymph nodes of any size in the mediastinum is usually considered to be a pathological finding. the aim of this study was to find out whether it was possible to detect normal lymph nodes by high-resolution mediastinal US Material and Methods: Six different mediastinal regions in 80 healthy asymptomatic volunteers and in 20 human cadavers were examined by means of US (with colour Doppler imaging) to assess US access to the respective regions and to demonstrate the number and size of detectable lymph nodes. All the cadaveric lymph nodes that were detected were examined histologically to exclude inflammatory or malignant infiltration Results: in almost all subjects, we obtained US access to the supra-aortic (100%), paratracheal (95%), prevascular (99%), and pencardial (98%) regions, and to the aorticopulmonary window (98%). US access to the subcarinal region was more difficult (75%). in the healthy subjects, lymph nodes were detected in the paratracheal region (in 35% of these subjects, mean lymph-node diameter 12×7 mm), in the aorticopulmonary window (45%, 14×8 mm), and in the subcarinal region (13%, 13×7 mm). in the cadavers, histologically normal lymph nodes were detected frequently in the paratracheal region (85%, mean size 11×6 mm) and in the aorticopulmonary window (90%, 11×5 mm) Conclusion: These results indicate that normal lymph nodes (and not only pathological lymph nodes) can be demonstrated by high-resolution mediastinal US

scholarly journals A Hospital Based Observational Study on Diagnostic Role of High-Resolution Ultrasound and Doppler Imaging in Evaluation of Non-Thyroidal Neck Masses of Patients Attending the Department of Radiodiagnosis, AMCH, Dibrugarh with FineNeedle Aspiration / Histopathological Correlation

2021 ◽  
Vol 8 (11) ◽  
pp. 597-602
Author(s):  
Kallol Prasad Das ◽  
Pronami Borah ◽  
Mondita Borgohain ◽  
Rudra Kanta Gogoi ◽  
Raamseena N.A.
Keyword(s):  
Lymph Node ◽  
High Resolution ◽  
Lymph Nodes ◽  
Adult Population ◽  
Cervical Lymphadenopathy ◽  
Doppler Imaging ◽  
Neck Swelling ◽  
Colour Doppler ◽  
Female Ratio ◽  
Study Results

BACKGROUND Neck swellings consists of a wide spectrum of pathological entities. These swelling can occur due to a variety of aetiologies consisting of congenital, acquired inflammatory, neoplastic, or vascular origin. It is essential to have an extensive knowledge of the anatomy and contents of each cervical compartment to achieve a diagnosis. The age of presentation and clinical findings often narrows down the differential diagnosis. Ultrasonography (USG) is helpful in differentiating the nature of the lesions and differentiating solid from cystic neck lesions. Ultrasound is often used as an initial modality for pre-treatment assessment of any neck swelling. METHODS Patients with clinically palpable / non-palpable neck swellings were scanned using 7.5 - 11 MHz transducers, excluding patients with diagnosed thyroid swellings. RESULTS In total 120 cases were studied; the mean age of patients was 34 years with a male to female ratio of 1.1:1. The age wise categorisation included paediatric population (34.2 %) and adult population (65.8 %). 96 (80 %) cases presented with painless neck swelling, 76 (63.3 %) cases were non-neoplastic and 44 (36.7 %) cases were neoplastic in nature. Cervical lymphadenopathy being the most common ultrasound finding in both paediatric and adult population. Malignant lesions were most common in adult age group. Heterogeneous echotexture, rounded nodes, intranodal necrosis, loss of echogenic hila, peripheral nodal blood flow and increased pulsatility index (PI) and resistive index (RI) were important features of malignant lymph nodes. Sensitivity and specificity of USG and Doppler in differentiating neoplastic from non-neoplastic lesions were 97.7 % and 98.3 % respectively and for differentiating benign from metastatic nodes were 97.7 % and 98.3 % respectively. CONCLUSIONS Considering the study results and observations, USG is the best initial investigation for the evaluation of inflammatory, cystic and neoplastic swellings in various age groups. It is non-invasive, cost effective readily available and repeatable technique. It is relatively easier to use and does not involve radiation hazards. Colour Doppler can evaluate the vascularity of the lesions and provide details of any vascular invasion of metastatic lesions. Ultrasound can differentiate aetiology of lymph node enlargement to a significant extent. KEYWORDS High Resolution Ultrasound, Paediatric Neck Mass, Metastatic Lymph Node, Histopathology, FNAC, Tubercular Lymph Nodes, Colour Doppler, Non-Thyroidal

Magnetic Navigation of Collective Cell Microrobots in Blood Under Ultrasound Doppler Imaging

2021 ◽  
pp. 1-12
Author(s):  
Qianqian Wang ◽  
Yuan Tian ◽  
Xingzhou Du ◽  
Ho Ko ◽  
Bonaventure Yiu Ming Ip ◽  
...  
Keyword(s):  
Doppler Imaging ◽  
Magnetic Navigation ◽  
Ultrasound Doppler

Pulsed doppler techniques for measuring instantaneous maximum and mean flow velocities in carotid arteries

1984 ◽  
Vol 10 (4) ◽  
pp. 419-426 ◽  
Author(s):  
Karl-Fredrik Lindegaard ◽  
Søren Jacob Bakke ◽  
Arne Grip ◽  
Helge Nornes
Keyword(s):  
Carotid Arteries ◽  
Pulsed Doppler ◽  
Mean Flow ◽  
Doppler Techniques ◽  
Flow Velocities

Simultaneous Fetal Magnetocardiography and Ultrasound/Doppler Imaging

2007 ◽  
Vol 54 (6) ◽  
pp. 1167-1171 ◽  
Author(s):  
Hui Zhao ◽  
Mingli Chen ◽  
Barry D. Van Veen ◽  
Janette F. Strasburger ◽  
Ronald T. Wakai
Keyword(s):  
Doppler Imaging ◽  
Ultrasound Doppler ◽  
Fetal Magnetocardiography
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