Premium
Microwave‐induced thermoacoustic tomography: Reconstruction by synthetic aperture
Author(s) -
Feng Dazi,
Xu Yuan,
Ku Geng,
Wang Lihong V.
Publication year - 2001
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1418015
Subject(s) - thermoacoustics , transducer , tomography , microwave , acoustics , iterative reconstruction , aperture (computer memory) , microwave imaging , optics , signal (programming language) , synthetic aperture radar , ultrasonic sensor , noise (video) , materials science , physics , computer science , image (mathematics) , computer vision , quantum mechanics , programming language
We have applied the synthetic‐aperture method to linear‐scanning microwave‐induced thermoacoustic tomography in biological tissues. A nonfocused ultrasonic transducer was used to receive thermoacoustic signals, to which the delay‐and‐sum algorithm was applied for image reconstruction. We greatly improved the lateral resolution of images and acquired a clear view of the circular boundaries of buried cylindrical objects, which could not be obtained in conventional linear‐scanning microwave‐induced thermoacoustic tomography based on focused transducers. Two microwave sources, which had frequencies of 9 and 3 GHz, respectively, were used in the experiments for comparison. The 3 GHz system had a much larger imaging depth but a lower signal–noise ratio than the 9 GHz system in near‐surface imaging.