J Digit Imaging - Dual-pass feature extraction on human vessel images.

Tópicos

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Resumo

We present a novel algorithm for the extraction of cavity features on images of human vessels. Fat deposits in the inner wall of such structure introduce artifacts, and regions in the images captured invalidating the usual assumption of an elliptical model which makes the process of extracting the central passage effectively more difficult. Our approach was designed to cope with these challenges and extract the required image features in a fully automated, accurate, and efficient way using two stages: the first allows to determine a bounding segmentation mask to prevent major leakages from pixels of the cavity area by using a circular region fill that operates as a paint brush followed by Principal Component Analysis with auto correction; the second allows to extract a precise cavity enclosure using a micro-dilation filter and an edge-walking scheme. The accuracy of the algorithm has been tested using 30 computed tomography angiography scans of the lower part of the body containing different degrees of inner wall distortion. The results were compared to manual annotations from a specialist resulting in sensitivity around 98 %, false positive rate around 8 %, and positive predictive value around 93 %. The average execution time was 24 and 18 ms on two types of commodity hardware over sections of 15 cm of length (approx. 1 ms per contour) which makes it more than suitable for use in interactive software applications. Reproducibility tests were also carried out with synthetic images showing no variation for the computed diameters against the theoretical measure.

Resumo Limpo

present novel algorithm extract caviti featur imag human vessel fat deposit inner wall structur introduc artifact region imag captur invalid usual assumpt ellipt model make process extract central passag effect difficult approach design cope challeng extract requir imag featur fulli autom accur effici way use two stage first allow determin bound segment mask prevent major leakag pixel caviti area use circular region fill oper paint brush follow princip compon analysi auto correct second allow extract precis caviti enclosur use microdil filter edgewalk scheme accuraci algorithm test use comput tomographi angiographi scan lower part bodi contain differ degre inner wall distort result compar manual annot specialist result sensit around fals posit rate around posit predict valu around averag execut time ms two type commod hardwar section cm length approx ms per contour make suitabl use interact softwar applic reproduc test also carri synthet imag show variat comput diamet theoret measur

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