Abstract
We have applied the synthetic-aperture method to linear-scanning microwave-induced thermoacoustic tomography in biological tissues. A non-focused 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 (LMTT) based on focused transducers. Two microwave sources, which had frequencies of 9 GHz 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.
Feng, Dazi (2001). Microwave-induced thermoacoustic tomography: reconstruction by synthetic aperture. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -2001 -THESIS -F39.