45 results match your criteria final centerline

Detection of 3D Arterial Centerline Extraction in Spiral CT Coronary Angiography.

J Healthc Eng 2021 21;2021:2670793. Epub 2021 Aug 21.

Changshu Hospital of Chinese Medicine, Changshu 215516, Jiangsu, China.

This paper presents an in-depth study and analysis of the 3D arterial centerline in spiral CT coronary angiography, and constructs its detection and extraction technique. The first time, the distance transform is used to complete the boundary search of the original figure; the second time, the distance transform is used to calculate the value of the distance transform of all voxels, and according to the value of the distance transform, unnecessary voxels are deleted, to complete the initial contraction of the vascular region and reduce the computational consumption in the next process; then, the nonwitnessed voxels are used to construct the maximum inner joint sphere model and find the skeletal voxels that can reflect the shape of the original figure. Finally, the skeletal lines were optimized on these initially extracted skeletal voxels using a dichotomous-like principle to obtain the final coronary artery centerline. Read More

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Ordered multi-path propagation for vessel centerline extraction.

Phys Med Biol 2021 Jul 19;66(15). Epub 2021 Jul 19.

Laboratory of Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, People's Republic of China.

Vessel centerline extraction from x-ray angiography images is essential for vessel structure analysis in the diagnosis of coronary artery disease. However, complete and continuous centerline extraction remains a challenging task due to image noise, poor contrast, and complexity of vessel structure. Thus, an iterative multi-path search framework for automatic vessel centerline extraction is proposed. Read More

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Noise-induced scaling in skull suture interdigitation.

PLoS One 2020 17;15(12):e0235802. Epub 2020 Dec 17.

Graduate school of Medical Sciences, Kyushu University, Fukuoka, Japan.

Sutures, the thin, soft tissue between skull bones, serve as the major craniofacial growth centers during postnatal development. In a newborn skull, the sutures are straight; however, as the skull develops, the sutures wind dynamically to form an interdigitation pattern. Moreover, the final winding pattern had been shown to have fractal characteristics. Read More

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January 2021

Lipid-rich Plaques Detected by Near-infrared Spectroscopy Are More Frequently Exposed to High Shear Stress.

J Cardiovasc Transl Res 2021 Jun 9;14(3):416-425. Epub 2020 Oct 9.

Department of Cardiology, Erasmus MC, Rotterdam, The Netherlands.

High wall shear stress (WSS) and near-infrared spectroscopy (NIRS) detected lipid-rich plaque (LRP) are both known to be associated with plaque destabilization and future adverse cardiovascular events. However, knowledge of spatial co-localization of LRP and high WSS is lacking. This study investigated the co-localization of LRP based on NIRS and high WSS. Read More

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Simulation of three-stage operating temperature for supersaturation water-based condensational growth tube.

J Environ Sci (China) 2020 Apr 24;90:275-285. Epub 2019 Dec 24.

Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; University of Science and Technology of China, Hefei 230026, China; CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address:

In order to realize accurate dynamic control of supersaturation and to study condensation growth characteristics of nanoparticles through different levels of supersaturation, a series of parametric analyses and systematic comparisons between two-stage and three-stage operating temperature designs were simulated with COMSOL Multiphysics. The simulation results showed that the three-stage operating temperature did not change peak supersaturation compared with two operating temperatures, and the three-stage operating temperature was superior in decreasing the amount of water vapor and the temperature, thus lowering particle loss and variation in detection and collection. The peak supersaturation level increased by 0. Read More

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A new method for the 3D reconstruction of coronary bifurcations pre and post the angioplasty procedure using the QCA.

Annu Int Conf IEEE Eng Med Biol Soc 2019 Jul;2019:5757-5760

The aim of this study is to propose a new semi-automated method for three-dimensional (3D) reconstruction of coronary bifurcations arteries using X-ray Coronary Angiographies (CA). Considering two monoplane angiographic views as the input data, the method is based on a four-step approach. In the first step, the image pre-processing and the vessel segmentation is performed. Read More

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Mitral Annulus Segmentation Using Deep Learning in 3-D Transesophageal Echocardiography.

IEEE J Biomed Health Inform 2020 04 12;24(4):994-1003. Epub 2019 Dec 12.

3D Transesophageal Echocardiography is an excellent tool for evaluating the mitral valve and is also well suited for guiding cardiac interventions. We introduce a fully automatic method for mitral annulus segmentation in 3D Transesophageal Echocardiography, which requires no manual input. One hundred eleven multi-frame 3D transesophageal echocardiography recordings were split into training, validation, and test sets. Read More

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Optimization design of magnetic filter for the prototype RF negative ion source at ASIPP.

Rev Sci Instrum 2019 Nov;90(11):115117

Institute of Plasma Physics, Chinese Academy of Science, Hefei 230031, People's Republic of China.

For a prestudy of the key science and technology of the RF negative ion source for fusion application, a negative RF ion source test facility was developed at the Institute of Plasma Physics, Chinese Academy of Science (ASIPP). The magnetic filter field in front of the extraction system plays an important role in reducing the loss of negative hydrogen ions and inhibiting coextraction of electrons. The existing filter field of the prototype ion source is generated by permanent magnets arranged on both sides of the expansion chamber; the gradient and the uniformity of the field are poor, resulting in a large plasma distribution unevenness in the experiment. Read More

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November 2019

Precise estimation of renal vascular dominant regions using spatially aware fully convolutional networks, tensor-cut and Voronoi diagrams.

Comput Med Imaging Graph 2019 10 19;77:101642. Epub 2019 Aug 19.

Graduate School of Informatics, Nagoya University, Nagoya, Japan; Information Technology Center, Nagoya University, Japan; Research Center for Medical Bigdata, National Institute of Informatics, Japan. Electronic address:

This paper presents a new approach for precisely estimating the renal vascular dominant region using a Voronoi diagram. To provide computer-assisted diagnostics for the pre-surgical simulation of partial nephrectomy surgery, we must obtain information on the renal arteries and the renal vascular dominant regions. We propose a fully automatic segmentation method that combines a neural network and tensor-based graph-cut methods to precisely extract the kidney and renal arteries. Read More

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October 2019

Fabrication of Low-Cost Patient-Specific Vascular Models for Particle Image Velocimetry.

Cardiovasc Eng Technol 2019 09 16;10(3):500-507. Epub 2019 May 16.

Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, USA.

Purpose: Particle image velocimetry (PIV), an in vitro experimentation technique that optically measures velocity components to analyze fluid velocity fields, has become increasingly popular to study flow dynamics in various vascular territories. However, it can be difficult and expensive to create patient-specific clear models for PIV due to the importance of refractive index matching of the model and the fluid. We aim to implement and test the use of poly-vinyl alcohol (PVA) in a lost-core casting technique to create low-cost, patient-specific models for PIV. Read More

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September 2019

Quality Control of High Carbon Steel for Steel Wires.

Materials (Basel) 2019 Mar 13;12(6). Epub 2019 Mar 13.

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China.

High-carbon steel wires used for bridge cables, tire reinforcement materials and cutting materials of silicon ingot for photovoltaic industry require an extremely fine diameter and high strength. Poor control of centerline segregation, inclusion and microstructure of high-carbon steel is detrimental to drawability and subsequent fatigue performance. Prof. Read More

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Numerical simulation of patient-specific endovascular stenting and coiling for intracranial aneurysm surgical planning.

J Transl Med 2018 07 21;16(1):208. Epub 2018 Jul 21.

ArteryFlow Technology Co., Ltd, 459 Qianmo Road, Suite C1-501, Binjiang District, Hangzhou, 310000, Zhejiang Province, China.

Background: In this study, we develop reliable and practical virtual coiling and stenting methods for intracranial aneurysm surgical planning. Since the purpose of deploying coils and stents is to provide device geometries for subsequent accurate post-treatment computational fluid dynamics analysis, we do not need to accurately capture all the details such as the stress and force distribution for the devices and vessel walls. Our philosophy for developing these methods is to balance accuracy and practicality. Read More

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Retinal artery/vein classification using genetic-search feature selection.

Comput Methods Programs Biomed 2018 Jul 24;161:197-207. Epub 2018 Apr 24.

Department of Biomedical and Information Engineering, Northeastern University, Shenyang, China; Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands. Electronic address:

Background And Objectives: The automatic classification of retinal blood vessels into artery and vein (A/V) is still a challenging task in retinal image analysis. Recent works on A/V classification mainly focus on the graph analysis of the retinal vasculature, which exploits the connectivity of vessels to improve the classification performance. While they have overlooked the importance of pixel-wise classification to the final classification results. Read More

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Cochlear Implant Insertion Axis Into the Basal Turn: A Critical Factor in Electrode Array Translocation.

Otol Neurotol 2018 02;39(2):168-176

Sorbonne Universités, Université Pierre et Marie Curie Paris 6, Inserm, Unité "Réhabilitation chirurgicale mini-invasive et robotisée de l'audition".

Hypothesis: An inappropriate insertion axis leads to intracochlear trauma during cochlear implantation (CI).

Background: Few studies assessed the relationship between the insertion axis and the electrode scalar location.

Methods: Preimplantation cone-beam CT (CBCT) was performed on 12 human temporal bones. Read More

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February 2018

Outcomes of thoracic endovascular aortic repair in adult coarctation patients.

J Vasc Surg 2018 02 22;67(2):369-381.e2. Epub 2017 Sep 22.

Division of Vascular Surgery and Endovascular Therapy, University of Alabama at Birmingham, Birmingham, Ala.

Background: Aortic coarctation (AC) is most commonly identified in pediatric patients; however, adults can present with late sequelae of untreated coarctation or complications of prior open repair. To date, there are limited data about the role of thoracic endovascular aortic repair (TEVAR) in this group of patients. The purpose of this analysis was to describe our experience with management of adult coarctation patients using TEVAR. Read More

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February 2018

Does the DSA reconstruction kernel affect hemodynamic predictions in intracranial aneurysms? An analysis of geometry and blood flow variations.

J Neurointerv Surg 2018 Mar 2;10(3):290-296. Epub 2017 May 2.

Institute of Neuroradiology, University Hospital Magdeburg, Magdeburg, Germany.

Background: Computational fluid dynamics (CFD) blood flow predictions in intracranial aneurysms promise great potential to reveal patient-specific flow structures. Since the workflow from image acquisition to the final result includes various processing steps, quantifications of the individual introduced potential error sources are required.

Methods: Three-dimensional (3D) reconstruction of the acquired imaging data as input to 3D model generation was evaluated. Read More

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Automated Anatomy-Based Tracking of Systemic Arteries in Arbitrary Field-of-View CTA Scans.

IEEE Trans Med Imaging 2017 06 9;36(6):1359-1371. Epub 2017 Mar 9.

We propose an automated pipeline for vessel centerline extraction in 3-D computed tomography angiography (CTA) scans with arbitrary fields of view. The principal steps of the pipeline are body part detection, candidate seed selection, segment tracking, which includes centerline extraction, and vessel tree growing. The final tree-growing step can be instantiated in either a semi- or fully automated fashion. Read More

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Temporally and Spatially Resolved x-ray Fluorescence Measurements of in-situ Drug Concentration in Metered-Dose Inhaler Sprays.

Pharm Res 2016 Apr 12;33(4):816-25. Epub 2015 Nov 12.

Laboratory for Turbulence Research in Aerospace & Combustion, Department of Mechanical & Aerospace Engineering, Monash University, Melbourne, Victoria, Australia.

Purpose: Drug concentration measurements in MDI sprays are typically performed using particle filtration or laser scattering. These techniques are ineffective in proximity to the nozzle, making it difficult to determine how factors such as nozzle design will affect the precipitation of co-solvent droplets in solution-based MDIs, and the final particle distribution.

Methods: In optical measurements, scattering from the constituents is difficult to separate. Read More

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Effect of interfacial slip on the cross-stream migration of a drop in an unbounded Poiseuille flow.

Phys Rev E Stat Nonlin Soft Matter Phys 2015 Aug 4;92(2):023002. Epub 2015 Aug 4.

Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India.

We analyze the motion and deformation of a buoyant drop suspended in an unbounded fluid which is undergoing a quadratic shearing flow at small Reynolds number in the presence of slip at the interface of the drop. The boundary condition at the interface is accounted for by means of a simple Navier slip condition. Expressions for the velocity and the shape deformation of the drop are derived considering small but finite interface deformation, and results are presented for the specific cases of sedimentation, shear flow, and Poiseuille flow with previously reported results as the limiting cases of our general expressions. Read More

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Analysis of Fundus Fluorescein Angiogram Based on the Hessian Matrix of Directional Curvelet Sub-bands and Distance Regularized Level Set Evolution.

J Med Signals Sens 2015 Jul-Sep;5(3):141-55

Department of Ophthalmology, Isfahan University of Medical Sciences, Isfahan, Iran.

This paper presents a new procedure for automatic extraction of the blood vessels and optic disk (OD) in fundus fluorescein angiogram (FFA). In order to extract blood vessel centerlines, the algorithm of vessel extraction starts with the analysis of directional images resulting from sub-bands of fast discrete curvelet transform (FDCT) in the similar directions and different scales. For this purpose, each directional image is processed by using information of the first order derivative and eigenvalues obtained from the Hessian matrix. Read More

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Outcome-based anatomic criteria for defining the hostile aortic neck.

J Vasc Surg 2015 Jun 28;61(6):1383-90.e1. Epub 2015 Feb 28.

Department of Vascular Surgery, St. Antonius Hospital, Nieuwegein, The Netherlands.

Objective: There is abundant evidence linking hostile proximal aortic neck anatomy to poor outcome after endovascular aortic aneurysm repair (EVAR), yet the definition of hostile anatomy varies from study to study. This current analysis was undertaken to identify anatomic criteria that are most predictive of success or failure at the aortic neck after EVAR.

Methods: The study group comprised 221 patients in the Aneurysm Treatment using the Heli-FX Aortic Securement System Global Registry (ANCHOR) clinical trial, a population enriched with patients with challenging aortic neck anatomy and failure of sealing. Read More

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A novel method for identifying a graph-based representation of 3-D microvascular networks from fluorescence microscopy image stacks.

Med Image Anal 2015 Feb 28;20(1):208-23. Epub 2014 Nov 28.

Dept. Electrical and Computer Engineering, Tufts University, Medford, MA, USA.

A novel approach to determine the global topological structure of a microvasculature network from noisy and low-resolution fluorescence microscopy data that does not require the detailed segmentation of the vessel structure is proposed here. The method is most appropriate for problems where the tortuosity of the network is relatively low and proceeds by directly computing a piecewise linear approximation to the vasculature skeleton through the construction of a graph in three dimensions whose edges represent the skeletal approximation and vertices are located at Critical Points (CPs) on the microvasculature. The CPs are defined as vessel junctions or locations of relatively large curvature along the centerline of a vessel. Read More

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February 2015

An approach to EVAR simulation using patient specific modeling.

Ann Vasc Surg 2014 Oct 6;28(7):1769-74. Epub 2014 Jun 6.

Division of Vascular & Endovascular Surgery, USF Health Morsani School of Medicine, Tampa, FL.

Background: The Simbionix Angiomentor Procedure Rehearsal Studio (PRS) offers accurate virtual anatomy for measurement, stent graft selection, and deployment of endovascular aneurysm repair (EVAR) devices.

Methods: Selected Gore Excluder EVAR cases from our EVAR database were reviewed and DICOM data loaded into the Simbionix Angiomentor simulator using PRS software. Using centerline measurements created on PRS, neck diameter (D1), length from lowest renal artery to each iliac bifurcation (Ll and Lr), and common iliac artery diameter (Dl and Dr) were recorded. Read More

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October 2014

Changes in geometric configuration and biomechanical parameters of a rapidly growing abdominal aortic aneurysm may provide insight in aneurysms natural history and rupture risk.

Theor Biol Med Model 2013 Dec 5;10:67. Epub 2013 Dec 5.

Vascular Surgery Department, University Hospital of Heraklion & University of Crete Medical School, PO Box 1352, Heraklion, Crete 711 10, Greece.

Background: Abdominal aortic aneurysms (AAA) are currently being treated based on the maximum diameter criterion which has often been proven insufficient to determine rupture risk in case of every AAA. We analyzed a rare case of an AAA which presented an extremely fast growth focusing on biomechanical determinants that may indicate a high risk profile. The examination of such a case is expected to motivate future research towards patient-specific rupture risk estimations. Read More

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December 2013

[3D region growing algorithm driven by morphological dilation for airway tree segmentation in image guided therapy].

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 2013 Aug;30(4):679-83, 691

Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China.

The precise three-dimensional (3-D) segmentation of airway from CT image is essential for the image-guided therapy, which helps avoid a serious airway injury. We proposed a new segmentation algorithm for the calculation. Firstly, region growing method was employed to segment the main bronchioles (rough segmentation). Read More

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Vessel visualization using curved surface reformation.

IEEE Trans Vis Comput Graph 2013 Dec;19(12):2858-67

Vienna University of Technology.

Visualizations of vascular structures are frequently used in radiological investigations to detect and analyze vascular diseases. Obstructions of the blood flow through a vessel are one of the main interests of physicians, and several methods have been proposed to aid the visual assessment of calcifications on vessel walls. Curved Planar Reformation (CPR) is a wide-spread method that is designed for peripheral arteries which exhibit one dominant direction. Read More

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December 2013

Airway tree segmentation in serial block-face cryomicrotome images of rat lungs.

IEEE Trans Biomed Eng 2014 Jan 15;61(1):119-30. Epub 2013 Aug 15.

A highly automated method for the segmentation of airways in the serial block-face cryomicrotome images of rat lungs is presented. First, a point inside of the trachea is manually specified. Then, a set of candidate airway centerline points is automatically identified. Read More

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January 2014

The impact of perceptual treatments on driver's behavior: from driving simulator studies to field tests--first results.

Accid Anal Prev 2012 Mar 26;45:91-8. Epub 2011 Dec 26.

Université Paris Est, IFSTTAR-LEPSIS, F-75732 Paris, France.

Our study focused on the lateral position of drivers in relation to risk on rural crest vertical curves, using a field site proposed by a local operator of the French road network (Conseil Général de Maine-et-Loire, 49). The final goal was to test one road treatment on this field site. The study consisted of three stages. Read More

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Orthodontic considerations in restorative management of hypodontia patients with endosseous implants.

J Oral Implantol 2012 Dec 5;38(6):779-91. Epub 2011 Jul 5.

Craniofacial Orthodontics, Children's Hospital Los Angeles, CA, USA.

The use of implant-supported restorations in patients with hypodontia remains challenging and requires a multistage treatment that begins in late mixed dentition and continues into late adolescence. The aim of this article is to review the role of orthodontics in endosseous implant rehabilitation of patients with hypodontia. The MEDLINE, Web of Science, Scopus, Cochrane databases, and necessary scientific textbooks were searched for relevant studies and reviews, and as far as possible, they were only included if they had been cited at least once in the literature. Read More

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December 2012

[Automatic detection of vessels in color fundus images].

Arch Soc Esp Oftalmol 2010 Mar;85(3):103-9

Hospital Puerta del Mar, Cádiz, Departamento de Teoría de Señal y Comunicaciones, Universidad de Sevilla, Sevilla, España.

Purpose: The main purpose of the paper is to evaluate an automated method for blood vessels segmentation in color fundus images, due to its important role in the diagnosis of several pathologies such as diabetes. The final objective is to introduce the algorithm into a Computer Aided Diagnosis (CAD) tool that would be available in those local medical centers without specialists.

Method: An automated method for blood vessels segmentation in color fundus images was implemented and tested. Read More

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