Comput. Biol. Med. - Gallbladder shape extraction from ultrasound images using active contour models.

Tópicos

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Resumo

Gallbladder function is routinely assessed using ultrasonographic (USG) examinations. In clinical practice, doctors very often analyse the gallbladder shape when diagnosing selected disorders, e.g. if there are turns or folds of the gallbladder, so extracting its shape from USG images using supporting software can simplify a diagnosis that is often difficult to make. The paper describes two active contour models: the edge-based model and the region-based model making use of a morphological approach, both designed for extracting the gallbladder shape from USG images. The active contour models were applied to USG images without lesions and to those showing specific disease units, namely, anatomical changes like folds and turns of the gallbladder as well as polyps and gallstones. This paper also presents modifications of the edge-based model, such as the method for removing self-crossings and loops or the method of dampening the inflation force which moves nodes if they approach the edge being determined. The user is also able to add a fragment of the approximated edge beyond which neither active contour model will move if this edge is incomplete in the USG image. The modifications of the edge-based model presented here allow more precise results to be obtained when extracting the shape of the gallbladder from USG images than if the morphological model is used.

Resumo Limpo

gallbladd function routin assess use ultrasonograph usg examin clinic practic doctor often analys gallbladd shape diagnos select disord eg turn fold gallbladd extract shape usg imag use support softwar can simplifi diagnosi often difficult make paper describ two activ contour model edgebas model regionbas model make use morpholog approach design extract gallbladd shape usg imag activ contour model appli usg imag without lesion show specif diseas unit name anatom chang like fold turn gallbladd well polyp gallston paper also present modif edgebas model method remov selfcross loop method dampen inflat forc move node approach edg determin user also abl add fragment approxim edg beyond neither activ contour model will move edg incomplet usg imag modif edgebas model present allow precis result obtain extract shape gallbladd usg imag morpholog model use

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