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- Fredrik Andersson, Randolph L. Moses, Frank Natterer
- IEEE Transactions on Aerospace and Electronicâ€¦
- 2012

In synthetic aperture radar (SAR) one wishes to reconstruct the reflectivity function of a region on the ground from a set of radar measurements taken at several angles. The ground reflectivity isâ€¦ (More)

- Gengsheng Lawrence Zeng, Daniel Gagnon, Frank Natterer, Wenli Wang, Marc Wrinkler, William Hawkins
- 2001

Residual minimization with the well-known conjugate gradient (CG) algorithm has been applied to medical image reconstruction for years. The main advantage of this method is its fast convergence rate.â€¦ (More)

- Frank Natterer, Erik L. Ritman
- Int. J. Imaging Systems and Technology
- 2002

We give a short account of the history of CT from motion tomography in the early 1930â€™s to sprial CT. We discuss the physical and the mathematical background. Finally we give an outlook on possibleâ€¦ (More)

- Frank Natterer, Helmut Sielschott, Oliver Dorn, Thomas Dierkes, Victor Palamodov
- SIAM Journal of Applied Mathematics
- 2002

In many inverse problems a functional of u is given by measurements where u solves a partial differential equation of the type L(p)u + Su = q. Here, q is a known source term and L(p), S are operatorsâ€¦ (More)

- Frank Natterer, Frank WÃ¼bbeling
- Numerische Mathematik
- 2005

Since supp f âŠ‚ Î©, uÎ¸ satisfies the plain Helmholtz equation with constant wavenumber outside of Î©, the radiation condition and uÎ¸|âˆ‚Î© = gÎ¸. So by solving the exterior problem of the Helmholtz equationâ€¦ (More)

- Frank Natterer
- SIAM J. Imaging Sciences
- 2016

- Frank Natterer
- Handbook of Mathematical Methods in Imaging
- 2015

- Frank Natterer
- Computing
- 1970

Zu FehlerabschÃ¤tzungen und Konvergenzuntersuchungen wird hÃ¤ufig die Norm der Inversen eines Differentialoperators benÃ¶tigt. In dieser Arbeit werden fÃ¼r die Norm der Inversen einesâ€¦ (More)

- Thomas Kosters, Frank Natterer, Frank Wubbeling
- 2006 IEEE Nuclear Science Symposium Conferenceâ€¦
- 2006

In the presence of a strong scatterer, it is inappropriate to perform scatter correction by subtracting scattered from measured events and work on unscattered events only. Take, for example, a strongâ€¦ (More)

- Frank Natterer
- 2010

Different sets of conditions for an estimate of the form * '"Â«Â¿Â«iÂ«.Â» Â«c max Â»r vr+i)nÂ¿ ,n i Â°Â°x I' to hold are given. Here, y" is the Galerkin approximation to the solution v of a boundary valueâ€¦ (More)

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