_{Status of Centre of Excellence is granted by the Academy}
_{of Finland for the periods 20062011 and 20122017.}









CENTRE OF EXCELLENCEThe programme for Centres of Excellence (CoEs) in research is a significant funding scheme in the Finnish research system. The CoE programme offers an excellent opportunity for research teams and consortia to carry out research of a high international standard with sixyear funding. The aim of CoE programmes is to create favourable operating conditions for consortia of research teams, create potential for scientific breakthroughs at the interfaces of scientific disciplines and research fields, network Centres of Excellence nationally and internationally and raise the quality standard, international competitiveness, visibility and esteem of Finnish research. A Centre of Excellence is a competitive, innovative and targetoriented research community with a clear and challenging research vision. A Centre of Excellence is at the international cutting edge of research in its field and renews scientific research and expertise and combines international cuttingedge research. CALL FOR PAPERSThe journal Inverse Problems and Imaging, whose EditorinChief is Lassi Päivärinta, announces an upcoming Special Issue on Inverse Problems and Complex Geometrical Optics Solutions Please see this page for more details. 

INVERSE PROBLEMS
Inverse problems appear in several fields, including medical imaging, image processing, mathematical finance, astronomy, geophysics, nondestructive material testing and subsurface prospecting. Typical inverse problems arise from asking simple questions "backwards". For instance, the simple question might be "If we know precisely the structure of the inner organs of a patient, what kind of Xray images would we get from her?" The same question backwards is "Given a set of Xray images of a patient, what is the threedimensional structure of her inner organs?" This is the inverse problem of Computerized Tomography, or CT imaging.
Usually the inverse problem is more difficult than the simple question that it reverses. For example, even though the Earth's gravitational field is governed by Newton's law of gravitation, the inverse problem of finding subsurface structures from minor variations of the gravitational field on the surface is extremely hard. Successful solution of inverse problems requires specially designed algorithms that can tolerate errors in measured data.
Inverse problems research concentrates on the mathematical theory and practical interpretation of indirect measurements. The study of inverse problems is an active area of modern applied mathematics and one of the most interdisciplinary field of science.
FINNISH CENTRE OF EXCELLENCE IN INVERSE PROBLEMS RESEARCHThe Finnish Centre of Excellence in Inverse Problems is internationally recognized as the world's leading unit in the field. It specializes in the theory, implementation and application of inversion methods. The objective is to create fundamentally new, efficient, and theoretically sound solutions to practical inverse problems, especially in following application areas:
The Finnish Centre of Excellence in Inverse Problems Research is a network comprising research groups in the following institutions:
Director in charge of research is professor Lassi Päivärinta from University of Helsinki.  