Abstract
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.
Original language | English (US) |
---|---|
Pages (from-to) | 2427-2431 |
Number of pages | 5 |
Journal | Medical physics |
Volume | 28 |
Issue number | 12 |
DOIs | |
State | Published - Dec 1 2001 |
Keywords
- Microwave
- Synthetic aperture
- Thermoacoustics
- Tomography
ASJC Scopus subject areas
- Biophysics
- Radiology Nuclear Medicine and imaging