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We present a novel method to estimate the variation of kinetic model parameters directly from sinogram time series data. We determine the kinetic parameters independently for each voxel of the target through mmriimim likelihood estimation. The maximum likelihood estimates in the region of interest are collected into histograms. The histograms contain estimation error, which obeys maximum likelihood...
The presented study concerns the application of the pulse-echo ultrasound measurement technique in determining the elastic properties of fibres suspended in water. The two kinds of fibre materials are investigated, nylon 6/6 fibres and softwood pulp fibres. The fibre mass fraction was 0.5 % for nylon and ranges from 0 % up to 1 % for softwood pulp. The ultrasonic measurements are performed in the...
In the process industry there is a need for development of new or improved in-line sensor techniques determining bulk properties of a suspension or different physical properties of the suspended particles. In this study we present a sensing strategy where both acoustical and photoacoustical measurement techniques are integrated and applied to aqueous fibre suspensions. The two measurement techniques...
In order to model reasonably and flexibly the blood flow or perfusion in skeletal muscles with PET using H215O as tracer or radiopharmaceutical we introduce a new stochastic two-block - two-rate constants model with two new measurement equations. The stochastic two-block - two rate constants model utilizes the probability theory to describe the inherent variation of the muscle tissue with similarly...
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