Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. GPUaccelerated MatrixFree 3D Ultrasound Reconstruction for Nondestructive Testing
 Institute of Electrical and Electronics Engineers IEEE: IEEE International Ultrasonics Symposium, IUS 2018 : 2225 October 2018, Kobe, Japan Piscataway, NJ: IEEE, 2018 ISBN: 9781538634257 ISBN: 9781538634264 4 pp. 
 International Ultrasonics Symposium (IUS) <2018, Kobe> 
 FraunhoferGesellschaft FhG Fraunhofer Internal Programs; 025601128; ATTRACT 
 Deutsche Forschungsgemeinschaft DFG CoSMoS 

 English 
 Conference Paper 
 Fraunhofer IZFP () 
 Fast Iterative ShrinkageThresholding algorithm (FISTA); Sparse Signal Recovery (SSR); Orthogonal Matching Pursuit (OMP); ultrasound 
Abstract
In this paper, we propose a matrixfree 3D ultrasonic reconstruction scheme based on the Fast Iterative ShrinkageThresholding algorithm (FISTA) implemented on a GPU. The matrixfree implementation allows to reconstruct images even for problem sizes that would be intractable when explicitly calculating the matrix. However, due to the matrixfree implementation, additional steps are necessary to estimate the stepsize parameter required by FISTA, since the optimal stepsize depends on the largest singular value of the operator matrix, which in the matrixfree version is unavailable and cannot be built due to its size. The estimation is performed based on a priori knowledge of the model. We compare our method to 3D SAFT and OMP images of volumetric ultrasound measurement data of a steel specimen to show how FISTA leads to sharper images facilitating sizing and locating of defects within a specimen.