A Feasibility Study on the Use of Microwave Imaging for In-Vivo Screening of Knee Prostheses

This article provides a concept study on the feasibility of microwave imaging for in-vivo screening of knee implants. Using microwave imaging for condition monitoring would avoid the patient's exposure to X-ray, which is hazardous to human health. Therefore, it seems worthwhile to investigate the potentials of such a technique. Two essential aspects are investigated in the study 1) The propagation properties in human tissue and 2) The imaging capabilities of microwave synthetic aperture radar for screening polyethylene knee inlays. The first point addresses the challenge of the strong absorption in human tissue. Quantitative investigations were performed. For imaging, a cylindrical synthetic aperture was constructed in order to account for the convex geometry of the human knee. From the results of the two issues an imaging concept can be deduced which could enable a microwave-based screening of the human knee in the future.