نتایج جستجو برای: variation in lung density

تعداد نتایج: 17112898  

Journal: :Geography, Environment, Sustainability 2023

Digital topographic maps are created in a series of scales from large to small, and the underlying spatial data is commonly organized as multiscale database consisting several levels detail (LoDs). Spatial density features (or objects) such varies both between LoDs (coarser less densely populated with features) within each LoD (feature changes over area). While former type variation caused by g...

Journal: :Japanese Journal of Radiological Technology 1994

Journal: :Journal of Assisted Reproduction and Genetics 2012

Journal: :Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2012
Harry R Marshall Frank S Prato Lela Deans Jean Théberge R Terry Thompson Robert Z Stodilka

UNLABELLED Present attenuation-correction algorithms in whole-body PET/MRI do not consider variations in lung density, either within or between patients; this may adversely affect accurate quantification. In this work, a technique to incorporate patient-specific lung density information into MRI-based attenuation maps is developed and compared with an approach that assumes uniform lung density....

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