Comput Math Methods Med - A semiautomatic segmentation algorithm for extracting the complete structure of acini from synchrotron micro-CT images.

Tópicos

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Resumo

Pulmonary acinus is the largest airway unit provided with alveoli where blood/gas exchange takes place. Understanding the complete structure of acinus is necessary to measure the pathway of gas exchange and to simulate various mechanical phenomena in the lungs. The usual manual segmentation of a complete acinus structure from their experimentally obtained images is difficult and extremely time-consuming, which hampers the statistical analysis. In this study, we develop a semiautomatic segmentation algorithm for extracting the complete structure of acinus from synchrotron micro-CT images of the closed chest of mouse lungs. The algorithm uses a combination of conventional binary image processing techniques based on the multiscale and hierarchical nature of lung structures. Specifically, larger structures are removed, while smaller structures are isolated from the image by repeatedly applying erosion and dilation operators in order, adjusting the parameter referencing to previously obtained morphometric data. A cluster of isolated acini belonging to the same terminal bronchiole is obtained without floating voxels. The extracted acinar models above 98% agree well with those extracted manually. The run time is drastically shortened compared with manual methods. These findings suggest that our method may be useful for taking samples used in the statistical analysis of acinus.

Resumo Limpo

pulmonari acinus largest airway unit provid alveoli bloodga exchang take place understand complet structur acinus necessari measur pathway gas exchang simul various mechan phenomena lung usual manual segment complet acinus structur experiment obtain imag difficult extrem timeconsum hamper statist analysi studi develop semiautomat segment algorithm extract complet structur acinus synchrotron microct imag close chest mous lung algorithm use combin convent binari imag process techniqu base multiscal hierarch natur lung structur specif larger structur remov smaller structur isol imag repeat appli eros dilat oper order adjust paramet referenc previous obtain morphometr data cluster isol acini belong termin bronchiol obtain without float voxel extract acinar model agre well extract manual run time drastic shorten compar manual method find suggest method may use take sampl use statist analysi acinus

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