Systems and Methods for Detecting Contraband

A security scanner configured to detect contraband, said security scanner comprising:

• a detector array configured to acquire tomographic image data of a subject at a plurality of frequencies using low frequency electromagnetic tomography;
• and
• a processing device coupled to said detector array and configured to:
• generate a composite image of the subject at each of the plurality of frequencies using the acquired tomographic image data;
• determine a differentiation parameter for a tissue material at each of the plurality of frequencies;
• determine a differentiation parameter for a non-tissue material at each of the plurality of frequencies;
• decompose the composite images into a tissue image and a non-tissue image using the determined differentiation parameters, wherein the tissue image contains any region of the subject composed of the tissue material and the non-tissue image contains any region of the subject composed of the non-tissue material;
• and
• determine whether the non-tissue image contains any non-tissue material.

One or more computer-readable storage media having computer-executable instructions embodied thereon for scanning a subject for contraband, wherein when executed by at least one processor, the computer-executable instructions cause the at least one processor to:

• instruct a detector array to acquire tomographic image data of the subject at a plurality of frequencies using low frequency electromagnetic tomography;
• generate a composite image of the subject at each of the plurality of frequencies using the acquired tomographic image data;
• determine a differentiation parameter for a tissue material at each of the plurality of frequencies;
• determine a differentiation parameter for a non-tissue material at each of the plurality of frequencies;
• decompose the composite images into a tissue image and a non-tissue image using the determined differentiation parameters, wherein the tissue image contains any region of the subject composed of the tissue material and the non-tissue image contains any region of the subject composed of the non-tissue material;
• and
• determine whether the non-tissue image contains any non-tissue material.