23 KB393 KB12 KB200020242000Auer, Dorothea P.Hahn, KlausRodenacker, KarstenWinkler, Gerhardletnik:19številka:36 stranistr. 189-194COBISSID:12683225ISSN:1580-3139URN:URN:NBN:SI:doc-W0Z2UBGPenDruštvo za stereologijo in kvantitativno analizo slike, Medicinska fakultetaImage analysis and stereologyBrain mappingImage processing, computer-assistedjedrska magnetna resonancaMagnetic resonance imagingmatematična morfologijaMathematical computingmožganiobdelava slikslikovna diagnostikaSpatio-temporal data analysis with non-linear filters| brain mapping with fMRI data|Spatio-temporal digital data from fMRI (functional Magnetic Resonance Imaging)are used to analyse and to model brain activation. To map brain functions, a well-defined sensory activation is offered to a test person and the hemodynamic response to neuronal activity is studied. This so-called BOLD effect in fMRI is typically small and characterised by a very low signal to noise ratio. Hence the activation is repeated and the three dimensional signal(multi-slice 2D) is gathered during relatively long time ranges (3-5 min). From the noisy and distorted spatio-temporal signal the expected response has to be filtered out. Presented methods of spatio-temporal signal processing base on non-linear concepts of data reconstruction and filters of mathematical morphology (e.g. alternating sequential morphological filters). Filters applied are compared by classifications of activationsTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaDruštvo za stereologijo in kvantitativno analizo slike