نتایج جستجو برای: vessel
تعداد نتایج: 85393 فیلتر نتایج به سال:
In this paper, a new unsupervised algorithm for automatic retinal blood vessel extraction is presented. A pre-processing step is introduced to eliminating optic disk and back ground noise. Blood vessel highlighting is prepared by a new method inspired by simple cells in human visual system. An adaptive threshold is introduced as an activation function of simple cells. Post-processing step is us...
Introduction: Renal artery stenosis is the most prevalent disease of renal artery and has an important role in making hypertension and renal atrophy. Since in previous researches, despite high frequency of risk of cardiovascular disease in Iran, there did not exist any general research investigating risk factors of coronary artery disease and incidence of contemporary renal artery stenisis, ...
This model focuses on the behavior of capillary-tissue fluid exchange system when the diameter of the capillary is less than that of red cell. In vivo and in vitro observations indicate that the width of the gap between the red cell and the vessel wall is generally small compared to the radius of the capillary for a single file flow of red cell in narrow vessel, particularly if the vessel diame...
In this paper we consider the problem of blood vessel segmentation in retinal images. After enhancing the retinal image we use green channel of images for segmentation as it provides better discrimination between vessels and background. We consider the negative of retinal green channel image as a topographical surface and extract ridge points on this surface. The points with this property are l...
Recognizing the effective parameters on liquid fuel degradation and its shelf life prediction is an important issue. Most of the researches done in this area are limited to synthetic fuels. In this work, the shelf life of hydrocarbon fuel and the effect of vessel material, blanketing gas and vessel temperature on the amount of generated gum in the fuel have been investigated. The results showed...
Introduction: Heart failure is a major hazard for public health. Despite recent advance in medical therapy, there is not enough information on the outcome of off-pump coronary artery bypass (OPCAB) and medical therapy on the patients with severe ventricular dysfunction and triple-vessel (CAD). This study aimed to compare treatment outcomes and mortality rate in patients undergoing off-pump coro...
Background and Objective: This study aimed to evaluate the changes in macular superficial and deep capillary plexus (SCP and DCP) density, Foveal Avascular Zone (FAZ) area, and visual acuity in patients with diabetic macular edema after anti-VEGF therapy. Materials and Methods: This descriptive-analytical study utilized before and after treatment design. In total, 30 eyes of 30 patients with d...
حل مسائل سخت در چند دهه اخیر یکی از چالش های مطرح در حوزه آکادمیک و تحقیقات علمی بوده است. روش های اولیه حل این گونه مسائل، اغلب بر حل دقیق آنها از طریق الگوریتم های دقیق تکیه داشته است. اما با مطرح شدن مسائل سختی با ابعاد بزرگ و به دنبال آن افزایش پیچیدگی این گونه مسائل، ناکارآمدی الگوریتم های دقیق به علت زمان و حافظه بسیار زیادی که در حل مسائل سخت نیاز دارند مشخص گردید. با ظهور الگوریتم ه...
Retinal vessel segmentation is critical in detecting retinal blood vessels for a variety of eye disorders, and consistent computerized method required automatic disorder screening. Many methods are implemented, but these only yielded accuracy lack good sensitivity due to the coherence segmentation. Another main factor low proper technique handle low-varying contrast problem. In this study, we p...
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