The EMSD has introduced new computed tomography (CT) scanners, which can conduct contraband detection from all angles, for the Customs and Excise Department (C&ED). The new equipment having been put into use in the control ports can enhance the inspection efficiency of the C&ED and help the department to implement the Smart Customs Blueprint.
Certified by the European Civil Aviation Conference and in compliance with the requirements of the Radiation Ordinance, the new scanners can scan objects from 360 degrees, record multiple cross-sectional images of the objects and re-create their three-dimensional (3D) images using computer technology. Compared with conventional scanners which can only produce two-dimensional images, the new scanners are capable of performing 3D scanning and the X-rays of which can even pass through thick metals, reducing interference during the scanning process and creating clearer images, thus effectively enhancing detection sensitivity. Equipped with artificial intelligence (AI), the new scanners can also analyse image data automatically after scanning to help with detecting suspicious items and conducting preliminary screening, so that the C&ED officers can decide whether a thorough check should be conducted.
To ensure that the new equipment can operate precisely, the Works Improvement Team of the EMSD designed test components and printed them with 3D printers. High-precision stainless steel sheets were also cut into different sizes with a laser to simulate the sources of interference in the test. Using these test components, we thoroughly tested the 3D scanning functions of the new scanners as well as their precision and stability.
To further assist the C&ED’s inspection work, we will constantly study the use of the scanners and AI technology, with a view to using the equipment to detect more types of contraband and enhancing the inspection efficiency.