FINSIG 05

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FINSIG 2005Kuopio, Finland1020304050603512 410 20 30 40 50 60Phantom consists of 5 tissue types with spatiallyconstant activity in each.Activity/pixel within each tissue type iscomputed using given blood input function(time-activity curve of ROI #2) and the 1-compartment modelFor the Kalman smoother the state equationis a random walk model, that is F t ≡ I.This means that no information about theblood input or transportation is used in thereconstruction.Simulated activitiesNormalized activity concentration10.80.60.40.200 50 100 150t (s)ROI #1ROI #2ROI #3ROI #4ROI #5Projection bin10203040506070809020 40 60 80 100Projection number350300250200150100500Mikko Kervinen, Department of Applied Physics, University of Kuopio Slide 17
FINSIG 2005Kuopio, FinlandNormalized activity concentration10.80.60.40.2Least SquaresROI #1ROI #2ROI #3ROI #4ROI #5True Kalman Smoother Least Squares00 50 100 150t (s)Kalman SmootherNormalized activity concentration10.80.60.40.2ROI #1ROI #2ROI #3ROI #4ROI #500 50 100 150t (s)Mikko Kervinen, Department of Applied Physics, University of Kuopio Slide 18
Page 1 and 2: Mikko Kervinen † , Marko Vauhkone
Page 3 and 4: FINSIG 2005Kuopio, FinlandIntroduct
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Page 9 and 10: FINSIG 2005Kuopio, FinlandTomograph
Page 11 and 12: FINSIG 2005Kuopio, FinlandNotations
Page 13 and 14: FINSIG 2005Kuopio, Finland In SPECT
Page 15 and 16: FINSIG 2005Kuopio, FinlandState-spa
Page 17 and 18: FINSIG 2005Kuopio, Finland In case
Page 19 and 20: FINSIG 2005Kuopio, Finland In SPECT
Page 21: FINSIG 2005Kuopio, FinlandResults P
Page 25 and 26: FINSIG 2005Kuopio, Finland When pri
Page 27: FINSIG 2005Kuopio, FinlandConclusio

FINSIG 05

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