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1

Automatic estimation of the intima-media thickness of the common carotid artery

Turcza R., Zieliński T. P., Lay-Ekuakille A.

Elektronika : konstrukcje, technologie, zastosowania

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2010

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Vol. 51, nr 3

109-113

EN

In this paper we propose efficient method for automatic estimation of intima and media boundary of common carotid artery (CCA) based on USG image analysis. The distance between intima and media is called intima-media thickness (IMT) and is used to predict cardiovascular events like myocardial infarction and stroke. At present, it is measured by manual segmentation of USG image by physician. Automatic estimation of IMT by freeing physician from this tedious work should speed the process and assure higher reproducibility. The proposed algorithm involves USG image denoising by nonlinear diffusion filtering and iterative image segmentation by modified active contour method with suitable energy function.

PL

W artykule zaproponowano efektywną metodę do automatycznej estymacji położenia brzegów błony wewnętrznej i środkowej tętnicy szyjnej, bazującą na analizie obrazu USG. Odległość pomiędzy brzegami tych błon nosi nazwę grubości intima - media i jest wykorzystywana do prognozowania ryzyka sercowo - naczyniowego (zawałów, udarów). W chwili obecnej grubość intima - media jest mierzona drogą ręcznego podziału na części obrazu USG tętnicy szyjnej przez lekarza. Automatyczna estymacja tej grubości uwolni lekarza od tego czasochłonnego zajęcia i zapewni większą powtarzalność pomiaru. Algorytm obliczeniowy zaproponowany w artykule wykorzystuje nieliniową filtrację dyfuzyjną do skutecznego odszumiania obrazu USG oraz iteracyjną segmentację obrazu za pomocą zmodyfikowanej metody aktywnych konturów, wykorzystującej odpowiednio dobraną funkcję energii.

2

Modelling of examinations of artery wall thickness changes

Powałowski T., Wójcik J., Trawiński Z.

Archives of Acoustics

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2007

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Vol. 32, No. 4

851--857

EN

The developed solver of acoustic field was used for simulation of the artery wall thickness examination. It is capable of describing spatial and time-dependent distribution of an ultrasonic beam, that is emitted by a piezoelectric ring transducer and then backscattered on cylindrical surfaces of the walls in artery models. The electrical signal received corresponds closely with the actual RF signal that is obtained during measurements at the output of the ultrasonic VED apparatus. The theoretical model of the artery for creating the ultrasonic reflected echoes was used. The internal radius of the artery model was equal 3 mm for the diastolic pressure and 3.3 mm for the systolic pressure. The intima-media thickness (IMT) of the artery wall was changed from 0.48 mm to 0.44 mm respectively. The echoes-tracking solver based on the zero-crossing and correlation methods was used for detecting changes of the IMT.

3

The computerised system for measurement of the intima-media thickness

Kwiatkowski J., Kwiatkowska W., Kawa K., Tabakow M.

Journal of Medical Informatics & Technologies

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2000

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Vol. 1

CS 31--39

EN

The quickest developments of non-invasive medical diagnostic methods are observed. One of them is high-resolution ultrasonic imaging. It can demonstrate the layers of the arterial wall with a high degree of clarity. The paper deals with the short description of the computerised system for measurement of the intima-media thickness, which can be used for the evaluation of the vascular wall. The image transformations, which improve quality of the ultrasonography images during computerised medical evaluation, are presented. The measurement can be performed manually or semi-automatic. The system is based on Doppler-duplex ultrasonography system and IBM PC computer with frame grabber board. Measurement are performed off-line on the frozen images recorded on videotape although real-time images are also recorded to simplify the evaluation of the structure. The described system can be use for archival purposes as well for current medical diagnostics. The computer software is written in Visual C++ programming language under WINDOWS system.