US 12,169,181 B2
Transmission imaging detection device and its computerized tomography system
Zheng Fang, Xiamen (CN)
Assigned to XIAMEN UNIVERSITY, Xiamen (CN)
Appl. No. 17/600,123
Filed by Zheng Fang, Xiamen (CN)
PCT Filed Sep. 19, 2019, PCT No. PCT/CN2019/106732
§ 371(c)(1), (2) Date Sep. 30, 2021,
PCT Pub. No. WO2021/046883, PCT Pub. Date Mar. 18, 2021.
Prior Publication US 2022/0205932 A1, Jun. 30, 2022
Int. Cl. G01N 23/046 (2018.01); G01N 23/083 (2018.01); G01N 23/10 (2018.01)
CPC G01N 23/046 (2013.01) [G01N 23/083 (2013.01); G01N 23/10 (2013.01); G01N 2223/419 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A transmission imaging detection device for collecting projection diagrams of measured objects on a conveyor belt, wherein the transmission imaging detection device comprises X-ray projection imaging devices and laser occlusion sensing devices, the measured objects translate across the X-ray projection imaging devices and laser occlusion sensing devices on the conveyor belt, and the laser occlusion sensing devices determine whether the measured objects enter detection segments, the X-ray projection imaging devices collect projection data of the measured objects entering the detection segments; wherein the X-ray projection imaging devices comprise a number K of X-ray sources and a number K of X-ray array detectors, the laser occlusion sensing devices comprise a number K of laser transmitters and a number K of laser receivers, the number K of X-ray sources and the number K of X-ray array detectors are located on both sides of the thickness of the conveyor belt, the number K of laser transmitters and the number K of laser receivers are located on both sides of the width of the conveyor belt; a length of each X-ray array detector is A, a length of each X-ray source to the midpoint of the X-ray array detector is D, and a central line of the X-ray source to the X-ray array detector is perpendicular to the X-ray array detector, an angle between the X-ray array detector and the x-z surface is θ, wherein θ=nα, here α is a rotation step angle of CT projection sampling of a CT system, n∈[1,K] and is an integer; when the CT system is designed for full scan mode, α=2π/K; when the CT system is designed for short scan mode, α=(π+2γ)/K, wherein γ is the maximum fan angle; the conveyor belt drives the measured object to move horizontally at a speed of v, a direction of v is defined as z, a direction along the vertical line is defined as y, a direction perpendicular to v is defined as x, and the order of x, y and z axes satisfies the right-handed spiral rule.