Journal
MEDICAL PHYSICS
Volume 35, Issue 9, Pages 4026-4032Publisher
WILEY
DOI: 10.1118/1.2966345
Keywords
thermoacoustic tomography; high contrast; breast cancer imaging; modified integration algorithm; velocity potential; absorption contrast
Funding
- National Natural Science Foundation of China [30470494, 30627003]
- Natural Science Foundation of Guangdong Province [7117865]
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A fast thermoacoustic computed tomography system with a multielement linear transducer array was developed to image biological tissues with circular scanning. The spatial resolution of the imaging system and the spectra of the thermoacoustic signals were analyzed. A modified integration backprojection algorithm using velocity potential was employed to recover the direct energy deposition distribution, signal processing methods, and reconstruction algorithms were validated by imaging a phantom. The differences of the microwave-frequency dielectric properties between malignant and normal adipose-dominated tissues in the breast are considerable, and the absorption contrast can reach as large as 6:1 at 1.2 GHz. An experiment of human breast tissue with a tumor was performed with this system; the thermoacoustic images reconstructed by a limited-field-filtered backprojection algorithm and a modified integration backprojection algorithm were also compared with a mammogram. Our results show that the system can provide a rapid and noninvasive approach for high-contrast breast cancer imaging. (C) 2008 American Association of Physicists in Medicine.
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