Title :
Evaluation of image resolution in X-wave imaging system
Author :
Fatemi, M. ; Arad, M.A.
Author_Institution :
Dept. of Electr. Eng., Amirkabir Univ., Tehran, Iran
Abstract :
A novel pulse-echo imaging system based on X-wave nondiffracting transmission and reception is described. In the theoretical model of this system a position-dependent filter has been used for pulse generation and subsequently for processing of the received echoes. In practice, the system can be implemented using an annular array transducer and a filter bank. The point spread function (PSF) of the imaging system has been derived. The PSF has an asteroid shape with branches extending to infinity. To reduce the effects of branches and improve image resolution, a space-invariant restoration filter is used. The performance of the imaging system, for broadband as well as for bandlimited X-waves, and the restoration process are evaluated by computer simulations. Simulation results indicate that the system is capable of providing high resolution, large depth of field images
Keywords :
acoustic imaging; X-wave imaging system; annular array transducer; asteroid shape; bandlimited X-waves; computer simulations; filter bank; image resolution; point spread function; position-dependent filter; received echos processing; space-invariant restoration filter; theoretical model; Computational modeling; Computer simulation; Filter bank; H infinity control; High-resolution imaging; Image resolution; Image restoration; Pulse generation; Shape; Transducers;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301518
