研究目的
To develop fast modeling methods for estimating the imaging performance of whole body screening using millimeter wave imaging systems, focusing on the simulation of MIMO imaging systems and the improvement of PO and RT methods for faster and more accurate imaging.
研究成果
The study successfully extends conventional PO method to general dielectric objects and proposes two RT schemes for fast estimation of MIMO system imaging performance. The methods demonstrate feasibility through numerical experiments, showing potential for accelerating MIMO system design for whole body screening.
研究不足
The study is limited by the computational resources required for full-wave analysis, the simplification of human skin as a lossless dielectric object, and the assumption of smooth property of body skin dominating the generation of scattered field.
1：Experimental Design and Method Selection:
The study employs a modified PO method for calculating scattered fields for both metal and non-metal dielectric mediums and proposes RT methods for fast estimation of MIMO imaging system performance.
2：Sample Selection and Data Sources:
Human body models with dielectric skin medium and metal objects (e.g., pistols) are used.
3：List of Experimental Equipment and Materials:
A cross structure MIMO array with transmitters on a column and receivers on an arc is utilized.
4：Experimental Procedures and Operational Workflow:
The PO method involves finding illuminated facets, calculating equivalent currents, and computing scattered fields. RT methods involve ray tracing for fast estimation of imaging coverage.
5：Data Analysis Methods:
The image is reconstructed using a back-propagation algorithm, and K-means clustering is used for noise reduction.
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