scholarly journals Model-Based Analysis of Flow-Mediated Dilation and Intima-Media Thickness

2008 ◽  
Vol 2008 ◽  
pp. 1-10 ◽  
Author(s):  
G. Bartoli ◽  
G. Menegaz ◽  
M. Lisi ◽  
G. Di Stolfo ◽  
S. Dragoni ◽  
...  
Keyword(s):  
Low Cost ◽  
A Priori ◽  
Automatic Measurement ◽  
Intima Media Thickness ◽  
Image Features ◽  
Flow Mediated Dilation ◽  
User Friendliness ◽  
Real Time Processing ◽  
Media Thickness

We present an end-to-end system for the automatic measurement of flow-mediated dilation (FMD) and intima-media thickness (IMT) for the assessment of the arterial function. The video sequences are acquired from a B-mode echographic scanner. A spline model (deformable template) is fitted to the data to detect the artery boundaries and track them all along the video sequence. The a priori knowledge about the image features and its content is exploited. Preprocessing is performed to improve both the visual quality of video frames for visual inspection and the performance of the segmentation algorithm without affecting the accuracy of the measurements. The system allows real-time processing as well as a high level of interactivity with the user. This is obtained by a graphical user interface (GUI) enabling the cardiologist to supervise the whole process and to eventually reset the contour extraction at any point in time. The system was validated and the accuracy, reproducibility, and repeatability of the measurements were assessed with extensivein vivoexperiments. Jointly with the user friendliness, low cost, and robustness, this makes the system suitable for both research and daily clinical use.

scholarly journals Geographic Origin as a Determinant of Carotid Artery Intima-Media Thickness and Brachial Artery Flow-Mediated Dilation

2005 ◽  
Vol 25 (2) ◽  
pp. 392-398 ◽  
Author(s):  
Markus Juonala ◽  
Jorma S.A. Viikari ◽  
Mika Kähönen ◽  
Leena Taittonen ◽  
Tapani Rönnemaa ◽  
...  
Keyword(s):  
Carotid Artery ◽  
Brachial Artery ◽  
Geographic Origin ◽  
Intima Media Thickness ◽  
Flow Mediated Dilation ◽  
Media Thickness ◽  
Artery Flow

scholarly journals FLOW MEDIATED DILATION AND CAROTID INTIMA MEDIA THICKNESS IN PATIENTS WITH CHRONIC GASTRITIS ASSOCIATED WITH HELICOBACTER PYLORI INFECTION

2017 ◽  
Vol 54 (4) ◽  
pp. 300-304 ◽  
Author(s):  
Arezo JUDAKI ◽  
Siros NOROZI ◽  
Mohammad Reza Hafezi AHMADI ◽  
Samira Mis GHAVAM ◽  
Khairollah ASADOLLAHI ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Endothelial Dysfunction ◽  
Chronic Gastritis ◽  
Intima Media Thickness ◽  
Carotid Intima Media Thickness ◽  
Control Group ◽  
Flow Mediated Dilation ◽  
Infection Group ◽  
Media Thickness ◽  
H Pylori

ABSTRACT BACKGROUND: Endothelial dysfunction is one of the early stages of vascular diseases. OBJECTIVE: The aim of this study was to investigate the endothelial dysfunction markers in patients with chronic gastritis associated with Helicobacter pylori (H. pylori) infection. METHODS: By a cross sectional study, basic and clinical information of 120 participants (40 patients with positive H. pylori infection, 40 patients with negative H. pylori infection and 40 healthy people) were analyzed. Carotid intima media thickness and flow-mediated dilation levels were measured in all patients and controls. Soluble vascular cell adhesion molecule-1 (sVCAM-1) and intercellular adhesion molecule-1 (ICAM-1) were measured with Elisa for all subjects. IgG level was assessed in chronic gastritis patients. RESULTS: The flow-mediated dilation level in patients with positive H. pylori infection (0.17%±0.09) was significantly lower than those with negative H. pylori infection (0.21% ±0.10, P<0.05) and compared to the control group (0.27% ±0.11, P<0.05). Carotid intima media thickness level in patients with positive H. pylori infection (0.58±0.13 mm) was significantly higher than those with negative H. pylori infection (0.48±0.32 mm, P<0.05) and compared to the control group (0.36±0.44mm, P<0.05). The mean level of sICAM-1 in positive H. pylori infection group (352.16±7.54 pg/mL) was higher than negative H. pylori infection group (332.64±8.75 pg/mL =0.75) and compared to the control group (236.32±12.43 pg/mL, P<0.05). A direct relationship was revealed between flow-mediated dilation and carotid intima media thickness changes and between sICAM-1 and sVCAM-1 associated with the level of H. pylori IgG in chronic gastritis. CONCLUSION: The levels of flow-mediated dilation, carotid intima media thickness and sICAM-1 were higher among patients with positive H. pylori infection. Patients with chronic gastritis associated with H. pylori infection are at risk of endothelial dysfunction due to flow-mediated dilation and carotid intima media thickness abnormalities and increased level of sICAM-1 and sVCAM-1.

The Research and Design of Portable Leaf Disease Spots Image Acquisition System

2011 ◽  
Vol 128-129 ◽  
pp. 1480-1483
Author(s):  
Kai Song ◽  
Zhe Wang ◽  
Feng Ju Shen
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Image Acquisition ◽  
Processing System ◽  
Image Features ◽  
Acquisition System ◽  
Ultra Low Power ◽  
Real Time Processing ◽  
Leaf Disease ◽  
Image Acquisition System

The crop leaf disease spots image recognition technology has a great significance in identifying diseases and in effective spraying of pesticides to liminate diseases. We researched and designed the portable leaf disease spots image acquisition system since current PC-based processing system is high cost and lack of flexibility and real-timing, This system uses a high-performance 32-bit DSP chip based DM642 as its main processor, and also uses ultra-low power consumption and ultra-small size video decoder chips, large-capacity memories and high-performance communicator interfaces. As a result of the reasonable design of hardware architecture, this system realized leaf disease spots image features collecting and processing ，video transmitting, and achieved strong real-time processing capability, easy operation, low cost, anti-interference ability and other characteristics. The system prototype works well, and meets the design requirements.

Noninvasive Measurement of Brachial Wall Mechanics During Flow-Mediated Vasodilation Using 2D Ultrasound Strain Tensor Imaging

2008 ◽  
Author(s):  
Ahmed M. Mahmoud ◽  
Phoebe A. Stapleton ◽  
Jefferson C. Frisbee ◽  
Osama M. Mukdadi
Keyword(s):  
Fluid Shear Stress ◽  
Low Cost ◽  
Measurement Techniques ◽  
Strain Tensor ◽  
Automatic Measurement ◽  
Relative Displacement ◽  
Contributing Factors ◽  
Arterial Diameter ◽  
Luminal Diameter

Atherosclerosis has become one of the contributing factors of cardiovascular diseases. Endothelial dysfunction is considered a key factor in the development of atherosclerosis [1]. Flow-mediated vasodilatation (FMD) measurement in brachial and other conduit arteries has become a common method to asses the endothelial function in vivo [2]. Fluid shear-stress increases due to blood flow increases, thus stimulating endothelial cell production and release of nitric oxide, a potent endogenous vasodilator. The mechanical behavior of the arterial wall during vasodilatation is considered an indication for endothelial health. In FMD measurement, the endothelium-dependent variation in arterial diameter in response to reactive ischemia-induced hyperemia is measured by comparing the luminal diameter of the brachial artery before and after the ischemia of the forearm induced by pressurizing a cuff [3]. Ultrasound imaging modalities has been widely used in the FMD analysis as a noninvasive low-cost tool, which can be used to track the arterial diameter change with time. Most of the FMD measurements in the literature are based on tracing the vessel wall boundary manually. Since this process is time consuming and may introduce human errors, automatic measurement techniques have been implemented [3,4]. These techniques utilize image processing algorithms to identify the edges of arterial walls, and then calculate the relative displacement change with time.

scholarly journals Relationship Between Carotid Artery Intima-Media Thickness and Brachial Artery Flow-Mediated Dilation in Middle-Aged Healthy Men

2005 ◽  
Vol 45 (12) ◽  
pp. 1980-1986 ◽  
Author(s):  
Raymond T. Yan ◽  
Todd J. Anderson ◽  
Francois Charbonneau ◽  
Lawrence Title ◽  
Subodh Verma ◽  
...  
Keyword(s):  
Carotid Artery ◽  
Brachial Artery ◽  
Intima Media Thickness ◽  
Flow Mediated Dilation ◽  
Middle Aged ◽  
Healthy Men ◽  
Media Thickness ◽  
Artery Flow
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