Browsing by Subject "computer tomography"

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Access status: Open Access ,
Automatyczne wykrywanie konturu wątroby w obrazach tomograficzno-komputerowych
(Wydawnictwa AGH, 2006) Ciecholewski, Marcin; Dębski, Krzysztof
Computed Tomography (CT) has been widely used for liver disease diagnosis. CT scans can bring precise inspection and shape extraction during examination. Computer-assisted methods to help extract organs and classify diseases from medical seans has received considerable interests over the past years. As a first step of gathering necessary data we need to isolate or segment the liver boundary within CT liver image. In the paper a fully automated method to detect a liver contour has been presented. We propose an author's algorithm based on piece-wise linear interpolation which extracts liver boundary. The paper provides necessary background of radiological anatomy and imaging of the liver.
Access status: Open Access ,
Segmentacja wątroby w obrazach TK z wykorzystaniem modelu przybliżonego konturu
(Wydawnictwa AGH, 2006) Ciecholewski, Marcin; Dębski, Krzysztof
The segmentation of the liver structure from a computed tomography (CT) image is an important function of the software designed to assist liver diagnostics, because it allows for the elimination of excess information from the diagnostic process. This paper presents an original method of the automatic segmentation of the liver structure of both healthy organs and those with such specific disorders as hemangiomas and hepatomas. In this paper, the task of segmentation has been implemented through first finding the contour of the liver which is made up of a finite number of joint polylines approximating individual fragments of the liver in the CT image. The initial reference point for the calculations is the lumbar section of the spine which is a central point of any CT image of the liver. Next, the field outside the contour is divided into two polygons and eliminated from the image.