Exact frequency-domain reconstruction for thermoacoustic tomography--II: Cylindrical geometry.
other · Level V
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Abstract
Microwave-induced thermoacoustic tomography (TAT) in a cylindrical configuration is developed to image biological tissue. Thermoacoustic signals are acquired by scanning a flat ultrasonic transducer. Using a new expansion of a spherical wave in cylindrical coordinates, we apply the Fourier and Hankel transforms to TAT and obtain an exact frequency-domain reconstruction method. The effect of discrete spatial sampling on image quality is analyzed. An aliasing-proof reconstruction method is proposed. Numerical and experimental results are included.
Medical subject headings
- Algorithms
- Image Enhancement
- Microwaves
- Signal Processing, Computer-Assisted
- Tomography
- Ultrasonography