This paper demonstrates the outcomes of a feasibility study of a microwave imaging\nprocedure based on the Huygens principle for bone lesion detection. This study has been performed\nusing a dedicated phantom and validated through measurements in the frequency range of\n1â??3 GHz using one receiving and one transmitting antenna in free space. Specifically, a multilayered\nbone phantom, which is comprised of cortical bone and bone marrow layers, was fabricated.\nThe identification of the lesionâ??s presence in different bone layers was performed on images that were\nderived after processing through Huygensâ?? principle, the S21 signals measured inside an anechoic\nchamber in multi-bistatic fashion. The quantification of the obtained images was carried out by\nintroducing parameters such as the resolution and signal-to-clutter ratio (SCR). The impact of different\nfrequencies and bandwidths (in the 1â??3 GHz range) in lesion detection was investigated. The findings\nshowed that the frequency range of 1.5â??2.5 GHz offered the best resolution (1.1 cm) and SCR (2.22 on\na linear scale). Subtraction between S21 obtained using two slightly displaced transmitting positions\nwas employed to remove the artefacts; the best artefact removal was obtained when the spatial\ndisplacement was approximately of the same magnitude as the dimension of the lesion.
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