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Lokalizacija stimuliranega signala audio korteksa posnetega z magnetometrom na kalijeve pare
Jazbinšek, Vojko ; Beguš, Samo ; Trontelj, Zvonko, 1937-2024
Analizirali smo magnetne signale akustično stimuliranega slušnega korteksa, ki so bili posneti z magnetometrom na kalijeve pare (MKP). V primerjavi s SQUID magnetometri, ki se običajno uporabljajo za ...merjenje magnetnega polja možganskih tokov, imajo MKP primerljivo ali boljšo občutljivost, ne potrebujejo hlajenja in omogočajo enostavno izvedbo večkanalnega sistema. MKP temelji na merjenju Larmorjeve precesije elektronov v parah alkalnih kovin. Magnetometer deluje v t.i. SERF (spin-exchange relaxation free) načinu pri zelo nizkem polju in pri visokih gostotah K atomov ter dosega občutljivost v velikostnem razredu fT. Za lokalizacijo stimuliranega signala audio korteksa smo uprabili dva pristopa: i) iskanje optimalnega tokovnega dipola v modelu prevodne krogle z nelinearno metodo najmanjših kvadratov in ii) rekonstrukcijo tokov na površini korteksa z metodo najmanjše norme.
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