Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : Simulation of ultrasound nonlinear propagation on GPU using a generalized angular spectrum method | Varray et al. EURASIP Journal on Image and Video Processing 2011 2011 17 http content 2011 1 17 D EURASIP Journal on Image and Video Processing a SpringerOpen Journal RESEARCH Open Access Simulation of ultrasound nonlinear propagation on GPU using a generalized angular spectrum method 1 2 1 Francois Varray Christian Cachard Alessandro Ramalli Piero Tortoli and Olivier Basset Abstract Acoustic simulation has always played an important role in the development of new ultrasound imaging techniques. In nonlinear ultrasound imaging particularly the simulators are accurate but time-consuming because of the high derivative order of the propagation equation and to the classic solution based on finite difference schemes. This article presents a fast 3D t nonlinear ultrasound simulator based on a generalized angular spectrum method particularly fit for the graphics processing unit GPU . Indeed the Fourier domain approach decreases the derivative order of the propagation thus significantly speeding up the simulation time. The simulator was implemented and optimized on a central processing unit CPU and a GPU respectively. The processing times measured on two different graphic cards show that compared to the CPU GPU-based implementation is times faster. 1. Introduction The use of harmonic imaging in ultrasound has become popular because of the improvement it offers in terms of axial and lateral resolution with respect to standard B-mode imaging 1 . The new modality exploits the nonlinear propagation of ultrasound waves in human tissues yielding the presence of significant harmonics in the ultrasound echoes which can be selected on the receiver. The great interest in nonlinear propagation and its applications has stimulated the development of simulation programs capable of predicting the behavior of a large class of ultrasound waves in different tissues. The main strategies to simulate the distortion of a propagating wave are based on the
