Algorithm

Multi-Energy algorithm to improve Automatic Threat Detection (ME-ATD)

Customers want an operationally viable solution to improve their existing x-ray systems and keep them current with the evolving threat. They want to combine hardware and software in a unique solution to discriminate, quantify and identify materials without the penalty of a high false alarm rate that leads to reduced throughput and passenger facilitation. Working closely with its partners, MultiX is ready to offer the ME-ATD algorithm to improve ATD for security applications.

The MultiX ME-ATD algorithm runs in concert with the MultiX ME-100 data acquisition system (DAS) to provide state-of-the-art automated threat detection for both solid and liquid explosives. The ME-ATD algorithm can be installed on any existing transmission X-ray system (XRT) with ATD (single, dual or multi-view) providing it has been retrofitted with the MultiX ME-100 DAS.

The ME-ATD takes full advantage of the high resolution spectral information generated by the ME-100 to provide compliant solid and liquid explosives detection performance at very low false alarm rates without any reduction in throughput.

The ME-ATD improves the image segmentation steps of the threat detection algorithm to ensure objects are correctly identified and then refines the object classification based on analysis of the complete attenuation spectra. This enables materials, for example home made explosives (HMEs) with very similar X-ray attenuation properties to benign materials to be distinguished even in complex bag situations leading to much improved detection and false alarm rates. Existing OEM algorithms based on conventional dual energy DAS are limited in performance by the lack of accuracy and precision afforded by the detectors themselves and hence can never approach the performance levels demonstrated by the ME-ATD algorithm used with the ME-100 DAS.

Advanced features:

Runs on existing OEM host computer with no image processing throughput penalty.

Has a flexible configuration and can run on single, dual and multi-view systems (when upgraded with the ME-100).

Offers an upgrade path to existing systems via a retrofit with the ME-100 and therefore extends the life of existing systems.

A factor 3 reduction in false alarm rate when the ME-ATD is applied to divested liquid, aerosols and gels (LAGs) screening compared to existing dual energy based algorithms.

Detection rates above 90% with false alarms less than 5% has been observed in operational-like conditions.