Real-time tracking of metallic treatment probe in interstitial thermal therapy

In this paper, we propose an inverse scattering method with compressive sensing to image and track the metallic ablation probe during the interstitial thermal therapy. The contrast source inversion (CSI) method is used to solve the inverse scattering problem, which determines the location of the probe by utilizing the scattered field data produced by the contrast source current at the probe surface. A fast spectral gradient-projection method is used to solve the linear inverse problem with sparsity constraints and reconstructs the surface profile of the metallic probe. The proposed method will first be validated numerically by imaging a PEC probe in a realistic interstitial thermal therapy model, and then be validated experimentally with a vector network analyzer based inverse scattering measurement system.