| Investigation of Phase Singularity Problem in Microwave Breast Tomography |
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Seong-Ho Son, Nikolai Simonov, Kwang-Jae Lee, Soon-Ik Jeon |
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Radio Technology Research Department, ETRI |
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| Abstract |
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This paper investigates the phase singularity problem in microwave image reconstruction utilizing unwrapped phase data. The measured phases of the electric fields in most microwave measurement systems are wrapped. Thus, a certain phase unwrapping process is necessary for reconstruction of the image of a high contrast object. This unwrapping, however, is difficult in the presence of scattering nulls on/near the unwrapping path. At the null point, the phase value will be rendered, resulting in a poor image reconstruction. In this paper, we investigate the phase singularity arising from electromagnetic scattering nulls in microwave breast tomographic imaging. We then propose a transformation technique for the measured electric fields that avoids phase singularity. |
| Key words:
Microwave Tomography, Phase Singularity, Phase Unwrapping, Scattering Null |
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