scholarly journals Gray scale and edge detecting method to enhance image quality on liquid diffusivity measurement system

2019 ◽  
Author(s):  
H. Handoyo ◽  
D. Purwantiningsih ◽  
D. Maulidah ◽  
L. Soedarmawan ◽  
M. Aman ◽  
...  
Keyword(s):  
Image Quality ◽  
Measurement System ◽  
Gray Scale ◽  
Diffusivity Measurement ◽  
Liquid Diffusivity ◽  
Edge Detecting ◽  
Detecting Method

scholarly journals A technical note on intra-arterial cone-beam computed tomography for the evaluation of flow-diverter stents: Image quality differences between diluted and non-diluted contrast medium

2019 ◽  
Vol 26 (2) ◽  
pp. 164-169
Author(s):  
Naci Kocer ◽  
Sedat G Kandemirli ◽  
Daniel Ruijters ◽  
Michalis Mantatzis ◽  
Osman Kizilkilic ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Contrast Medium ◽  
Cone Beam Computed Tomography ◽  
Vessel Wall ◽  
Flow Diverter ◽  
Cone Beam ◽  
Gray Scale ◽  
Stent Deployment ◽  
Contrast Technique

Background Design of flow-diverter stents for flexibility, tractability, and low profile limits their radiopacity on conventional digital subtraction angiography. Cone-beam computed tomography (CBCT) offers higher spatial resolution for the evaluation of flow-diverter stents. However, CBCT requires optimal dilution and timing of contrast medium for simultaneous visualization of the stent, arterial lumen, and vessel wall. There are only limited data on the effects of different contrast dilutions on CBCT image quality in neurointerventional applications. Materials and methods In our institution, intra-arterial CBCTs were acquired during stent deployment and at follow-ups with 10% diluted contrast. We had recently started acquiring intra-arterial CBCTs with non-diluted contrast. Retrospective analysis of our flow-diverter data identified eight cases with different aneurysm locations who had intra-arterial CBCT with 10% diluted contrast immediately after flow-diverter stent deployment and with non-diluted contrast technique during follow-ups. For each case, the image quality between diluted and non-diluted contrast techniques was compared qualitatively by assessing stent visualization and quantitatively by plotting gray-scale intensity values along the vessel lumen. Results In two sets of CBCT images per each case, there was no substantial difference between diluted and non-diluted CBTC techniques for the evaluation of stent architecture and lumen opacification. Gray-scale intensity values perpendicular to the lumen revealed similar intensity values along the neighboring parenchyma, vessel wall, and lumen for the two different contrast techniques. Conclusion Intra-arterial CBCT angiography can be performed without contrast dilution and still achieve adequate image quality in certain cerebral aneurysms treated with flow diverter. The non-diluted contrast technique avoids the time loss during preparation of diluted contrast and installation of diluted contrast to the injector in angiography suites with a single power injector.

Thermal diffusivity measurement system applied to polymers

2012 ◽  
Author(s):  
B. Abad ◽  
P. Díaz-Chao ◽  
A. Almarza ◽  
D. Amantia ◽  
S. Vázquez-Campos ◽  
...  
Keyword(s):  
Thermal Diffusivity ◽  
Measurement System ◽  
Thermal Diffusivity Measurement ◽  
Diffusivity Measurement

Integration of IR Video to Enhance Measurements of the Thermal Diffusivity Tensor

2003 ◽  
Author(s):  
Xin Huang ◽  
Sean E. Davis ◽  
Neil T. Wright
Keyword(s):  
Thermal Diffusivity ◽  
Measurement System ◽  
Thermophysical Properties ◽  
A Priori ◽  
Temperature Sensors ◽  
Proper Position ◽  
Thermal Diffusivity Measurement ◽  
Diffusivity Measurement ◽  
Diffusivity Tensor

Proper positioning of temperature sensors is required to minimize error in measurements of thermal diffusivity. Calculating the proper position of these sensors a priori, however, requires knowing the very thermophysical properties of the material one is testing. Presented here are calculations illustrating how IR video might be used to optimize a biaxial, pulsed thermal diffusivity measurement system. Results will be shown for representative elastomers.

LCD motion blur detecting method based on image quality assessment

2015 ◽  
Vol 30 (3) ◽  
pp. 531-537
Author(s):  
邱聚能 QIU Ju-neng ◽  
李辉 LI Hui ◽  
闫乐乐 YAN Le-le ◽  
梁平 LIANG Ping
Keyword(s):  
Image Quality ◽  
Quality Assessment ◽  
Image Quality Assessment ◽  
Motion Blur ◽  
Detecting Method

A Method for Artificial Mark Recognition in Augmented Reality System

2014 ◽  
Vol 568-570 ◽  
pp. 617-621
Author(s):  
Jin Zhe Xie ◽  
Kai Liao ◽  
Jiu Long Xiong ◽  
Zhi Hu Wang
Keyword(s):  
Image Quality ◽  
Augmented Reality ◽  
Binary Image ◽  
Partial Occlusion ◽  
Gray Scale ◽  
Iterative Approximation ◽  
Augmented Reality System ◽  
Gray Scale Image

In this article we present a method to recognize artificial marks in augmented reality system. The distribution of marks is obtained by iterative approximation of the inconsistency between the synthetic gray-scale image and authentic binary image. The result shows our method can accurately recognize the marks, and solve the problem of mark recognition with partial occlusion or poor image quality.

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