Search results for: D.K. Iakovidis

Items from 1 to 20 out of 26 results

article

Telemonitoring predicts in advance heart failure admissions

G. Koulaouzidis, D.K. Iakovidis, A.L. Clark

International Journal of Cardiology > 2016 > 216 > C > 78-84

Heart failure (HF) is increasingly common and characterised by frequent admissions to hospital. To reduce the risk of HF hospitalisation (HFH), approaches as telemonitoring (TM) have been introduced. This study aimed to develop an algorithm for detecting patients at high risk of HFH, using daily collected physiological data (blood pressure, heart rate, weight) by non-invasive TM.The analysis was based...

article

Reduction of capsule endoscopy reading times by unsupervised image mining

D.K. Iakovidis, S. Tsevas, A. Polydorou

Computerized Medical Imaging and Graphics > 2010 > 34 > 6 > 471-478

The screening of the small intestine has become painless and easy with wireless capsule endoscopy (WCE) that is a revolutionary, relatively non-invasive imaging technique performed by a wireless swallowable endoscopic capsule transmitting thousands of video frames per examination. The average time required for the visual inspection of a full 8-h WCE video ranges from 45 to 120min, depending on the...

chapter

Automatic evaluation of the progress of bacterial pulmonary infections in temporal radiographic image sequences

S. Tsevas, D.K. Iakovidis

2009 9th International Conference on Information Technology and Applications in Biomedicine > 1 - 4

2009 9th International Conference on Information Technology and Applications in Biomedicine (ITAB 2009)

Pulmonary radiographs are essential tools to the evaluation and diagnosis of suspected infections of the lower respiratory system. Interpretation of a radiograph in the clinical context is a valuable diagnostic adjunct to the selection and the management of a specific clinical protocol for therapy. The key element in the proper diagnosis of a bacterial pulmonary infection is the analysis of the radiographic...

chapter

Active shape model aided by selective thresholding for lung field segmentation in chest radiographs

D.K. Iakovidis, M. Savelonas

2009 9th International Conference on Information Technology and Applications in Biomedicine > 1 - 4

2009 9th International Conference on Information Technology and Applications in Biomedicine (ITAB 2009)

Active shape models (ASMs) are statistical, deformable models, exhibiting a remarkable performance for the segmentation of the lung fields in plain chest radiographs. In this paper we propose a novel approach to improving the robustness of the original ASM against weak lung field boundaries, which can cause leaking of the shape's contour into the lung fields. The ASM is shielded against leaking by...

chapter

An ontology of image representations for medical image mining

D.K. Iakovidis, D. Schober, M. Boeker, S. Schulz

2009 9th International Conference on Information Technology and Applications in Biomedicine > 1 - 4

2009 9th International Conference on Information Technology and Applications in Biomedicine (ITAB 2009)

Ontologies are an effective means to formally specify and constrain knowledge. They have proved their utility in various data mining applications, especially in annotating text to render it machine interpretable. More challenging research perspectives arise when ontologies are used to annotate images where the information is encoded in numeric pixel values rather than in natural language. Current...

chapter

Towards the construction of intuitionistic fuzzy cognitive maps for medical decision making

E.I. Papageorgiou, D.K. Iakovidis

2009 9th International Conference on Information Technology and Applications in Biomedicine > 1 - 4

2009 9th International Conference on Information Technology and Applications in Biomedicine (ITAB 2009)

FCMs are appropriate to explicitly encode the knowledge and experience accumulated on the operation of a complex system. Once constructed for a particular domain, an FCM allows a qualitative simulation of the system. In this paper, we investigate a first approach to introduce intuitionistic fuzzy logic into the construction process of FCMs for improved medical decision making. The theory of intuitionistic...

chapter

Hierarchical Discovery of Patterns of Infections in Chest Radiographs Using Non-Negative Matrix Factorization

D.K. Iakovidis, S. Tsevas

2009 16th International Conference on Systems, Signals and Image Processing > 1 - 4

2009 16th International Conference on Systems, Signals and Image Processing

Chest radiography is a screening tool for the detection and the primary assessment of abnormalities consistent with the infections of the lower respiratory tract. Most commonly, the radiographic manifestations of bacterial infection are areas of consolidation with a segmental or lobar distribution which appear as areas of increased pulmonary opacity. This paper addresses the problem of the discovery...

article

A Pattern Similarity Scheme for Medical Image Retrieval

D.K. Iakovidis, N. Pelekis, E.E. Kotsifakos, I. Kopanakis, more

IEEE Transactions on Information Technology in Biomedicine > 2009 > 13 > 4 > 442 - 450

In this paper, we propose a novel scheme for efficient content-based medical image retrieval, formalized according to the PAtterns for Next generation DAtabase systems (PANDA) framework for pattern representation and management. The proposed scheme involves block-based low-level feature extraction from images followed by the clustering of the feature space to form higher-level, semantically meaningful...

article

Active Contours Guided by Echogenicity and Texture for Delineation of Thyroid Nodules in Ultrasound Images

M.A. Savelonas, D.K. Iakovidis, I. Legakis, D. Maroulis

IEEE Transactions on Information Technology in Biomedicine > 2009 > 13 > 4 > 519 - 527

Thyroid nodules are solid or cystic lumps formed in the thyroid gland and may be caused by a variety of thyroid disorders. This paper presents a novel active contour model for precise delineation of thyroid nodules of various shapes according to their echogenicity and texture, as displayed in ultrasound (US) images. The proposed model, named joint echogenicity-texture (JET), is based on a modified...

chapter

Automatic frame reduction of Wireless Capsule Endoscopy video

S. Tsevas, D.K. Iakovidis, D. Maroulis, E. Pavlakis

2008 8th IEEE International Conference on BioInformatics and BioEngineering > 1 - 6

2008 8th IEEE International Conference on Bioinformatics and BioEngineering

Wireless Capsule Endoscopy (WCE) is a non-invasive colour imaging technique that has been introduced for the screening of the gastrointestinal tract and especially the small intestine. WCE is performed by a wireless swallowable endoscopic capsule that transmits more than 50,000 video frames per examination. The visual inspection of the resulting video is a highly time-consuming task even for the experienced...

chapter

Versatile approximation of the lung field boundaries in chest radiographs in the presence of bacterial pulmonary infections

D.K. Iakovidis

2008 8th IEEE International Conference on BioInformatics and BioEngineering > 1 - 6

2008 8th IEEE International Conference on Bioinformatics and BioEngineering

The most common radiographic manifestation of bacterial pulmonary infections are foci of consolidation which are visible as bright shadows interfering with the interior lung intensity. In critically-ill patients this interference can be severe leading to vague or invisible lung field boundaries which are difficultly distinguished even by experienced physicians. This problem is amplified if the radiographs...

chapter

Automatic DNA microarray gridding based on Support Vector Machines

D. Bariamis, D. Maroulis, D.K. Iakovidis

2008 8th IEEE International Conference on BioInformatics and BioEngineering > 1 - 5

2008 8th IEEE International Conference on Bioinformatics and BioEngineering

This paper presents a novel method for DNA microarray gridding based on support vector machine (SVM) classifiers. It employs a set of soft-margin SVMs to estimate the lines of the DNA microarray grid by maximizing the margin between the lines and the spots. This process comprises an efficient and effective approach of separating the spots into distinct rows and columns. The classifiers are trained...

chapter

Unsupervised summarisation of capsule endoscopy video

D.K. Iakovidis, S. Tsevas, D. Maroulis, A. Polydorou

2008 4th International IEEE Conference Intelligent Systems > 1 > 3-15 - 3-20

2008 4th International IEEE Conference "Intelligent Systems" (IS)

Capsule endoscopy is a non-invasive imaging technique commonly used for screening of the entire small intestine. It is performed by a wireless swallowable endoscopic capsule capable of transmitting thousands of video frames per examination. The visual inspection of the vast amount of images acquired during such an examination is a subjective and highly time consuming task even for experienced gastroenterologists...

chapter

Automatic segmentation of the lung fields in portable chest radiographs based on Bézier interpolation of salient control points

D.K. Iakovidis, G. Papamichalis

2008 IEEE International Workshop on Imaging Systems and Techniques > 82 - 87

2008 IEEE International Workshop on Imaging Systems and Techniques

Portable chest radiographs are performed on the most critically-ill patients, who need highly skilled patient care and the best diagnostic tools. However, such radiographs are usually of low quality, mainly due to misaligned body positioning during their acquisition, and subject to a higher misinterpretation rate than the ones obtained with a non-portable X-ray device. This paper presents a pioneering...

chapter

Computer-Aided Malignancy Risk Assessment of Nodules in Thyroid US Images Utilizing Boundary Descriptors

M.A. Savelonas, D.E. Maroulis, D.K. Iakovidis, N. Dimitropoulos

2008 Panhellenic Conference on Informatics > 157 - 160

2008 12th Panhellenic Conference on Informatics

This paper investigates the diagnostic potential of boundary descriptors calculated on delineations of thyroid nodules in ultrasound images. The utilized set of boundary descriptors includes compactness, chain code histogram and fractal dimension. Experiments were conducted on thyroid US images, so as to evaluate the discriminating capability of each boundary descriptor for the classification of thyroid...

chapter

Thyroid Texture Representation via Noise Resistant Image Features

E.G. Keramidas, D.K. Iakovidis, D. Maroulis, N. Dimitropoulos

2008 21st IEEE International Symposium on Computer-Based Medical Systems > 560 - 565

21st IEEE International Symposium on Computer-Based Medical Systems (CBMS 2008)

The robustness of textural features on speckle noise is of vital importance for ultrasound imaging. A set of novel fuzzy features for thyroid ultrasound texture representation, demonstrating noise-resistant properties, is presented, analyzed and evaluated in this study. The textural feature extraction scheme is based on the fuzzyfication of the local binary pattern approach. The proposed features...

chapter

Computational Characterization of Thyroid Tissue in the Radon Domain

M.A. Savelonas, D.K. Iakovidis, N. Dimitropoulos, D. Maroulis

Twentieth IEEE International Symposium on Computer-Based Medical Systems (CBMS'7) > 189 - 192

Twentieth IEEE International Symposium on Computer-Based Medical Systems (CBMS'07)

This paper investigates a novel computational approach to thyroid tissue characterization in ultrasound images. It is based on the hypothesis that tissues in thyroid ultrasound images may be differentiated by directionality patterns. These patterns may not be always distinguishable by the human eye because of the dominant image noise. The encoding of the directional patterns in the thyroid ultrasound...

article

FPGA architecture for fast parallel computation of co-occurrence matrices

D.K. Iakovidis, D.E. Maroulis, D.G. Bariamis

Microprocessors and Microsystems > 2007 > 31 > 2 > 160-165

This paper presents a novel architecture for fast parallel computation of co-occurrence matrices in high throughput image analysis applications for which time performance is critical. The architecture was implemented on a Xilinx Virtex-XCV2000E-6 FPGA using VHDL. The symmetry and sparseness of the co-occurrence matrices are exploited to achieve improved processing times, and smaller, flexible area...

article

Variable Background Active Contour Model for Computer-Aided Delineation of Nodules in Thyroid Ultrasound Images

D.E. Maroulis, M.A. Savelonas, D.K. Iakovidis, S.A. Karkanis, more

IEEE Transactions on Information Technology in Biomedicine > 2007 > 11 > 5 > 537 - 543

This paper presents a computer-aided approach for nodule delineation in thyroid ultrasound (US) images. The developed algorithm is based on a novel active contour model, named variable background active contour (VBAC), and incorporates the advantages of the level set region-based active contour without edges (ACWE) model, offering noise robustness and the ability to delineate multiple nodules. Unlike...

article

Microarray-MD: A system for exploratory analysis of microarray gene expression data

D.E. Maroulis, I.N. Flaounas, D.K. Iakovidis, S.A. Karkanis

Computer Methods and Programs in Biomedicine > 2006 > 83 > 2 > 157-167

In this paper, we present Microarray Medical Data explorer (Microarray-MD), a novel software system that is able to assist in the exploratory analysis of gene expression microarray data. It implements a combination scheme of multiple Support Vector Machines, which integrates a variety of gene selection criteria and allows for the discrimination of multiple diseases or subtypes of a disease. The system...

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Keywords

MEDICAL IMAGE PROCESSING (13)
BIOMEDICAL IMAGING (7)
FEATURE EXTRACTION (7)
LUNGS (7)
DATA MINING (6)
DIAGNOSTIC RADIOGRAPHY (6)
IMAGE SEGMENTATION (6)
BIOMEDICAL ULTRASONICS (5)
BACTERIAL PULMONARY INFECTIONS (4)
BIOLOGICAL TISSUES (4)
CHEST RADIOGRAPHS (4)
DISEASES (4)
ENDOSCOPES (4)
LUNG (4)
ULTRASONIC IMAGING (4)
BIOLOGICAL ORGANS (3)
COMPUTER-AIDED DIAGNOSIS (3)
ENDOSCOPY (3)
IMAGE EDGE DETECTION (3)
IMAGE TEXTURE (3)
MEDICAL DIAGNOSTIC IMAGING (3)
PIXEL (3)
RADIOGRAPHY (3)
SHAPE (3)
TEXTURE (3)
THYROID NODULES (3)
THYROID ULTRASOUND IMAGES (3)
ACTIVE CONTOURS (2)
DISTANCE MEASUREMENT (2)
FUZZY C-MEANS ALGORITHM (2)
HISTOGRAMS (2)
IMAGE CLASSIFICATION (2)
IMAGE REPRESENTATION (2)
IMAGE RETRIEVAL (2)
INFORMATION RETRIEVAL (2)
MATRIX DECOMPOSITION (2)
MEDICAL IMAGES (2)
MICROORGANISMS (2)
NOISE (2)
NONNEGATIVE LAGRANGIAN RELAXATION (2)
NORMAL LUNG PARENCHYMA (2)
ONTOLOGIES (ARTIFICIAL INTELLIGENCE) (2)
PATIENT MONITORING (2)
SEMANTICS (2)
SPINAL CORD (2)
SUPPORT VECTOR MACHINES (2)
SVM (2)
ULTRASOUND (2)
ULTRASOUND (US) (2)
VIDEO (2)
VIDEO SIGNAL PROCESSING (2)
VISUAL INSPECTION (2)
WIRELESS CAPSULE ENDOSCOPY (2)
ABNORMAL TISSUE FINDINGS (1)
ACTIVE CONTOUR MODEL (1)
ACTIVE CONTOUR MODELS (1)
ACTIVE CONTOUR WITHOUT EDGES MODEL (1)
ACTIVE SHAPE MODEL (1)
ACTIVE SHAPE MODELS (1)
ANNOTATE IMAGES (1)
APPROXIMATION METHODS (1)
AREA UNDER CURVE (1)
ART GRIDDING APPROACH (1)
AUTOMATIC DNA MICROARRAY GRIDDING (1)
AUTOMATIC FRAME REDUCTION (1)
AUTOMATIC IMAGE SEGMENTATION (1)
AUTOMATIC SEGREGATION (1)
B&#X00E9;ZIER CURVES (1)
B-MODE THYROID ULTRASOUND IMAGES (1)
BACTERIAL INFECTION (1)
BACTERIAL INFECTIONS (1)
BEZIER INTERPOLATION (1)
BIOINFORMATICS (1)
BIOLOGICAL TECHNIQUES (1)
BIOMEDICAL OPTICAL IMAGING (1)
BIOMEDICAL SYSTEM (1)
BLOCK-BASED LOW-LEVEL FEATURE EXTRACTION (1)
BOUNDARY DESCRIPTORS (1)
CANCER (1)
CAPSULE ENDOSCOPY VIDEO (1)
CAUSE-EFFECT RELATIONSHIPS (1)
CHAIN CODE HISTOGRAM (1)
CHEST RADIOGRAPHY (1)
CLUSTER MERGING (1)
CLUSTERING ALGORITHMS (1)
CO-OCCURRENCE MATRIX (1)
COGNITION (1)
COLOR TEXTURE ANALYSIS (1)
COLORECTAL LESIONS (1)
COMPACTNESS (1)
COMPLEX SYSTEM (1)
COMPUTED TOMOGRAPHY (1)
COMPUTER AIDED DIAGNOSIS (1)
COMPUTER-AIDED DELINEATION (1)
COMPUTER-AIDED MALIGNANCY RISK ASSESSMENT (1)
COMPUTERIZED TOMOGRAPHY (1)
CONSOLIDATION FOCI (1)
CONTENT BASED RETRIEVAL (1)
CONTENT MANAGEMENT (1)
CONTENT-BASED IMAGE INDEXING (1)
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Elsevier (6)

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Search results for: D.K. Iakovidis

Telemonitoring predicts in advance heart failure admissions

Reduction of capsule endoscopy reading times by unsupervised image mining

Automatic evaluation of the progress of bacterial pulmonary infections in temporal radiographic image sequences

Active shape model aided by selective thresholding for lung field segmentation in chest radiographs

An ontology of image representations for medical image mining

Towards the construction of intuitionistic fuzzy cognitive maps for medical decision making

Hierarchical Discovery of Patterns of Infections in Chest Radiographs Using Non-Negative Matrix Factorization

A Pattern Similarity Scheme for Medical Image Retrieval

Active Contours Guided by Echogenicity and Texture for Delineation of Thyroid Nodules in Ultrasound Images

Automatic frame reduction of Wireless Capsule Endoscopy video

Versatile approximation of the lung field boundaries in chest radiographs in the presence of bacterial pulmonary infections

Automatic DNA microarray gridding based on Support Vector Machines

Unsupervised summarisation of capsule endoscopy video

Automatic segmentation of the lung fields in portable chest radiographs based on Bézier interpolation of salient control points

Computer-Aided Malignancy Risk Assessment of Nodules in Thyroid US Images Utilizing Boundary Descriptors

Thyroid Texture Representation via Noise Resistant Image Features

Computational Characterization of Thyroid Tissue in the Radon Domain

FPGA architecture for fast parallel computation of co-occurrence matrices

Variable Background Active Contour Model for Computer-Aided Delineation of Nodules in Thyroid Ultrasound Images

Microarray-MD: A system for exploratory analysis of microarray gene expression data

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