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Published September 17, 2018 | Published
Journal Article Open

Large field homogeneous illumination in microwave-induced thermoacoustic tomography based on a quasi-conical spiral antenna


Conventional helical and horn antennas based on frequency selective surfaces have been used to provide microwave illumination in microwave-induced thermoacoustic tomography (TAT). However, the electromagnetic waves radiated from the conventional antennas are not circularly polarized and thus impair image quality. In addition, conventional antennas can provide uniform radiations only within a relatively small area and thus limit their clinical applications (e.g., breast imaging). To address these problems, we propose a quasi-conical log-spiral antenna for homogenous illumination over a large field. We theoretically and experimentally validated this approach. Tissue-mimicking phantoms were imaged. The antenna produced not only an electric field with a circular polarization but also a homogeneous illumination area with a 10 cm diameter. Accordingly, our method has advanced TAT by improving microwave illumination.

Additional Information

© 2018 Published by AIP Publishing. Received 10 June 2018; accepted 7 September 2018; published online 21 September 2018. This work was supported in part by the China 973 program and the China Scholarship Council.

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August 19, 2023
October 18, 2023