نتایج جستجو برای: delineation
تعداد نتایج: 9137 فیلتر نتایج به سال:
Many of the qualities that characterize geographic regions are vague and granular in their nature. In many quality-based classification and delineation systems for geographic regions, therefore, there is a trade-off between the possible precision of the quality-based delineation and the scientific sophistication of the quality-based classification of geographic regions. This poses a dilemma for...
Introduction: Tumor volume delineation is the most important step in the radiation treatment planning. In this study the impact of PET/CT data on the tumor delineation precision of non-small cell lung cancer (NSCLC) was investigated. Methods: PET/CT images of 20 patients with primary NSCLC were obtained and imported to the treatment planning system for im...
Liver is the largest internal organ in human body. It lies under right ribs just beneath right lung, shaped like a pyramid and divided into four different lobes. It is the only internal organ which has the property of regeneration of lost tissue. It plays major role in metabolism, emulsification of lipids and stores nutrients. Accurate segmentation of liver is still a challenge due to differenc...
Introduction: Crater detection algorithms (CDA) have greatly evolved in the last decade and are detecting much smaller structures with higher performances [1-3] which is permitting their use in the construction and upgrade of crater catalogues, namely for Mars [4] and Phobos [5]. Although improvements are still required in the CDA, namely for detecting metric craters in diameter with the same h...
BACKGROUND AND PURPOSE Delineation of clinical target volumes (CTVs) is a weak link in radiation therapy (RT), and large inter-observer variation is seen in breast cancer patients. Several guidelines have been proposed, but most result in larger CTVs than based on conventional simulator-based RT. The aim was to develop a delineation guideline obtained by consensus between a broad European group...
AIM To evaluate whether virtual chromoendoscopy can improve the delineation of small bowel lesions previously detected by conventional white light small bowel capsule endoscopy (SBCE). METHODS Retrospective single center study. One hundred lesions selected from forty-nine consecutive conventional white light SBCE (SBCE-WL) examinations were included. Lesions were reviewed at three Flexible Sp...
Quantitative analysis of the left ventricle wall motion is important for the diagnosis of coronary heart disease. From wall motion, stroke volume, ejection fraction, and velocity of ventricular circumference can be estimated. These are helpful in identifying the state of diseased hearts. This paper describes a left ventricle boundary delineation algorithm which operates on X-Ray image data sets...
BACKGROUND Modern radiotherapy techniques enable delivery of high doses to the target volume without escalating dose to organs at risk, offering the possibility of better local control while preserving good quality of life. Uncertainties in target volume delineation have been demonstrated for most tumour sites, and various studies indicate that inconsistencies in target volume delineation may b...
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