Windows XP professional operating system; Large scale LCD with touch screen and a friendly user interface; Leading detector with 0.2 mm / 0.4 mm pixel pitch; c an detect small foreign objects such as metal, stone, glass, plastic, etc; Advanced image processing algorithms and pattern recognition techniques; Detect foreign objects in products packaged with aluminium foil; Detect foreign objects in glass canned food and iron canned food; Unwanted metal objects can be detected, while the metal parts belong to product itself can be ignored by our algorithm; Special pattern recognition algorithms for special products; Anode current of X-ray source below 1 mA assure safety for operators; The various protective devices assure safety for operators; Pass the testing of Shanghai Radiate Environment Supervisury Station.