This paper addresses problem of CT based investigation of pulmonary airways. Especially algorithm for airway tree segmentation is introduced. The algorithm is based on 3D seeded region growing. In the proposed method region growing is repeated twice with different settings. First, in order to avoid leakages into the lungs, algorithm is performed with very strict criteria. Next it works only in ...

Accurate knowledge of the airway geometry is needed when constructing physical models of the airway tree and for numerical modeling of flow or sound propagation in the airways. Human and animal experiments are conducted to validate these models. Many studies documented the geometric details of the human airways. However, information about the geometry of pig airways is scarcer. Earlier studies ...

Quantifying local changes to the airway wall surfaces from computed tomography images is important in the study of diseases such as chronic obstructive pulmonary disease. Current approaches segment the airways in the individual time point images and subsequently aggregate per airway generation or perform branch matching to assess regional changes. In contrast, we propose an integrated approach ...

OBJECTIVES To evaluate the influence of exposure parameters and raw-data-based iterative reconstruction (IR) on computer-aided segmentation and quantitative analysis of the tracheobronchial tree on multidetector computed tomography (MDCT). MATERIAL AND METHODS 10 porcine heart-lung-explants were mounted inside a dedicated chest phantom. MDCT was performed at 120kV and 80kV with 120, 60, 30 an...

Segmentation of tubular structures like blood vessels and airways in 3D volume data is of vital interest for medical applications like diagnosis and surgical planning. The proposed method uses a vessel detection filter, which is based on a novel multiscale medialness function and also provides a radius estimate. Based on the filter ouput, centerlines of the tubes are extracted and the vessel tr...

introduction: klippel feil syndrome (kfs) is a rare entity which is characterized by failure of normal segmentation of cervical vertebrae resulting in short neck with restricted movement and cervical instability. this anomaly increases the risk of neurological damage during airway instrumentation like laryngoscopy and positioning for surgery. case rports: we report three patients, a 42 year old...

At present, there is very limited information on the ecology, distribution, and structure of Cambodia's tree species to warrant suitable conservation measures. The aim of this study was to assess various methods of analysis of aerial imagery for characterization of the forest mensuration variables (i.e., tree height and crown width) of selected tree species found in the forested region around t...

The segmentation of tubular tree structures like vessel systems in volumetric medical images is of vital interest for many medical applications. However, a diverse set of challenging objectives and problems is related to this task in different application domains. In this work, we develop and evaluate methods to address these issues. To accomplish the segmentation of heavily branched structures...