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PURPOSE
MRI relaxation measurements are performed in the presence of a fictitious magnetic field in the recently described technique known as RAFF (Relaxation Along a Fictitious Field). This method operates in the 2(nd) rotating frame (rank n = 2) by using a nonadiabatic sweep of the radiofrequency effective field to generate the fictitious magnetic field.… (More)

- J M J Huttunen, H K Pikkarainen, Janne M J Huttunen, Hanna K Pikkarainen
- 2006

Discretization error in dynamical inverse problems: one-dimensional model case Powered by TCPDF (www.tcpdf.org) Abstract. We examine nonstationary inverse problems in which the time evolution of the unknown quantity is modelled by a stochastic partial differential equation. We consider the problem as a state estimation problem. The time discrete state… (More)

- Janne M J Huttunen, Philip B Stark
- 2011

The Pilot Approximation Trajectory (PAT) contour algorithm can find a contour of a function accurately when it is not practical to evaluate the function on a grid dense enough to use a standard contour algorithm, for instance, when evaluating the function involves conducting a physical experiment or a computationally intensive simulation. PAT relies on an… (More)

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