scholarly journals Analysis of the fast scanning method for tumor ablation with the effect of the large blood vessel by numerical simulation

2012 ◽  
Author(s):  
Shan Qiao ◽  
Guofeng Shen ◽  
Jingfeng Bai ◽  
Yazhu Chen
Keyword(s):  
Numerical Simulation ◽  
Blood Vessel ◽  
Tumor Ablation ◽  
Scanning Method ◽  
Large Blood Vessel

Numerical Simulation of Pulsating Flow over Blood Vessel Robot

2012 ◽  
Vol 591-593 ◽  
pp. 1734-1738
Author(s):  
Chun Yan Huang ◽  
Fan Jiang
Keyword(s):  
Numerical Simulation ◽  
Boundary Condition ◽  
Blood Flow ◽  
Blood Vessel ◽  
Surface Pressure ◽  
Blood Parameters ◽  
Pulsating Flow ◽  
Inlet Velocity ◽  
Blood Density

In order to study the influence of pulsating blood flow to robot and blood vessel, UDF programming of the inlet velocity is defined as the boundary condition, and the model simulate the turbulent blood flow. Moreover, in this situation, this paper analyzes the influence caused by blood parameters for the biggest surface pressure on robot. The results are showed that the variation of pressure and velocity is different on different position at 0.08s and 0.27s, and the surface pressure of the robot become greater by the increase of blood density or viscosity.

scholarly journals Pre-Diabetes Induces Ultrastructural Alterations in the Large Blood Vessel Aorta in Rats

2019 ◽  
Vol 37 (2) ◽  
pp. 647-653
Author(s):  
Abbas O El-Karib ◽  
Mohammad Dallak ◽  
Mohamed Abd-Ellatif ◽  
Refaat A Eid ◽  
Mohamed A Haidara ◽  
...  
Keyword(s):  
Blood Vessel ◽  
Ultrastructural Alterations ◽  
Large Blood Vessel

Numerical simulation of physiologically relevant pulsatile flow of blood with shear-rate-dependent viscosity in a stenosed blood vessel

2018 ◽  
Vol 11 (06) ◽  
pp. 1850082
Author(s):  
Subrata Mukhopadhyay ◽  
Mani Shankar Mandal ◽  
Swati Mukhopadhyay
Keyword(s):  
Numerical Simulation ◽  
Blood Flow ◽  
Blood Vessel ◽  
Pulsatile Flow ◽  
Time Dependent ◽  
Governing Equations ◽  
Rate Dependent ◽  
Realistic Situation ◽  
Newtonian Case ◽  
Dependent Viscosity

Pulsatile flow of blood in a blood vessel having time-dependent shape (diameter) is investigated numerically in order to understand some important physiological phenomena in arteries. A smooth axi-symmetric cosine shaped constriction is considered. To mimic the realistic situation as far as possible, viscosity of blood is taken to be non-uniform, a shear-thinning viscosity model is considered and a physiologically relevant pulsatile flow is introduced. Taking advantage of axi-symmetry in the proposed problem, the stream function–vorticity formulation is used to solve the governing equations for blood flow. Effect of different parameters associated with the problem on the flow pattern has been investigated and disparities from the Newtonian case are discussed in detail.

scholarly journals Interleukin-10 induces E-selectin on small and large blood vessel endothelial cells.

1996 ◽  
Vol 184 (3) ◽  
pp. 821-829 ◽  
Author(s):  
M Vora ◽  
L I Romero ◽  
M A Karasek
Keyword(s):  
Endothelial Cells ◽  
Blood Vessel ◽  
Skin Diseases ◽  
Umbilical Vein ◽  
Quantitative Polymerase Chain Reaction ◽  
Pcr Analysis ◽  
Transcriptional Level ◽  
Neutrophil Accumulation ◽  
Inflammatory Skin Diseases ◽  
Large Blood Vessel

In vitro, expression of E-selectin is largely restricted to endothelial cells activated by inflammatory cytokines. Under activated conditions, cytokines such as interleukin (IL) 10, released by keratinocytes in large quantities, may also increase the expression of E-selectin on the dermal microvasculature. The aim of the present study was to investigate the expression of E-selectin on cultured human dermal microvascular endothelial cells (HDMEC) isolated from neonatal foreskins when exposed to IL-10. Expression of E-selectin was determined by immunofluorescence microscopy, FACS analysis, an HL-60 cell-binding assay, and quantitative polymerase chain reaction (PCR) analysis. For comparison with large blood vessel cells, the expression of E-selectin on human umbilical vein endothelial cells (HUVEC) was also determined in parallel by FACS and reverse transcriptase-PCR analysis under identical conditions. These studies demonstrate that IL-10 induces the expression of E-selectin on both HDMEC and HUVEC and that the level of expression of HDMEC is comparable with that induced by IL-1 beta and tumor necrosis factor-alpha. When HL-60 cells are incubated with HDMEC pretreated with IL-10, a consistent increase in adherence of HL-60 to endothelial cells is observed. This adherence was found to be mediated by L-selectin. PCR analysis and the quantification of E-selectin cDNA by a novel, highly sensitive and specific PCR-immunoassay demonstrate the induction of E-selectin mRNA at the transcriptional level. The induction of the expression of E-selectin by IL-10 on HDMEC may provide additional insights into the pathogenic mechanism of neutrophil accumulation at the site of inflammation in inflammatory skin diseases.

The Comparison of Two Simulation Methods on the Thermal Ablation with Large Blood Vessel

2013 ◽  
Vol 444-445 ◽  
pp. 1177-1181
Author(s):  
Fei Zhai ◽  
Qun Nan ◽  
Hui Juan Zhang ◽  
Xue Mei Guo
Keyword(s):  
Heat Exchange ◽  
Blood Vessel ◽  
Thermal Ablation ◽  
Blood Flow Rate ◽  
Bioheat Transfer ◽  
Microwave Antenna ◽  
Simulation Methods ◽  
Large Blood Vessel ◽  
Significant Difference ◽  
Coupling Algorithm

Purpose: The aim of this study is to contrast the coupling algorithm (CEE) and boundary heat exchange coefficients (Nu) used in treatment of the large blood vessel in thermal ablation. Methods: Based on the Pennes bioheat transfer equation, the models with blood vessel parallel to microwave antenna were built with finite element method. In two kind of simulation, blood flow rate was set in 0.2 m/s or boundary heat exchange coefficients was set in 1750 W / (m2 °C), respectively. Results and conclusions : There was no significant difference on shape of effective ablation areas and 54°C temperature contours by using two kinds of simulation methods, especially the place far away from the blood vessel. At the place near the blood vessel, the method of CEE is closer to real condition which considers directivity of blood. Whats more, there are higher temperature by using method of Nu inside effective ablation areas.

Comparison of Two Techniques for Radio-frequency Hepatic Tumor Ablation through Numerical Simulation

2011 ◽  
Author(s):  
N. Kosturski ◽  
S. Margenov ◽  
Y. Vutov ◽  
Michail D. Todorov ◽  
Christo I. Christov
Keyword(s):  
Numerical Simulation ◽  
Radio Frequency ◽  
Hepatic Tumor ◽  
Tumor Ablation

Numerical simulation of fluid flow in CoCr multilayer modulators and the impact of flow lamination on the blood vessel wall affected by aneurism

2015 ◽  
Vol 208 ◽  
pp. S25
Author(s):  
Tiganescu Tudor Viorel ◽  
Costache Victor ◽  
Matache Liviu ◽  
Trana Eugen ◽  
Ciobanu Emanuela ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Blood Vessel ◽  
Vessel Wall ◽  
Blood Vessel Wall ◽  
The Impact

Large blood vessel cooling in heated tissues: a numerical study

1995 ◽  
Vol 40 (4) ◽  
pp. 477-494 ◽  
Author(s):  
M C Kolios ◽  
M D Sherar ◽  
J W Hunt
Keyword(s):  
Blood Vessel ◽  
Numerical Study ◽  
Large Blood Vessel
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