Patent Number: 
Section: claims

1. An X-ray fluoroscopic imaging system, comprising:an inspection passage (3) through which an inspected object (8) is passed;an electron accelerator (1) comprising an electron accelerating unit (102), an electron emitting unit (101) and a target (103), an electron beam (E) coming from the electron emitting unit and accelerated by the electron accelerating unit bombarding the target to generate an X-ray, wherein the X-ray has different energy distributions at different azimuth angles relative to the target (103);a shielding collimator apparatus (2) comprising a shielding structure (201), and a first collimator (202a) for extracting a low energy planar sector X-ray beam and a second collimator (202b) for extracting a high energy planar sector X-ray beam which are disposed within the shielding structure;a low energy detector array (4) for receiving the X-ray beam from the first collimator;a high energy detector array (5) for receiving the X-ray beam from the second collimator;wherein the shielding structure surrounds the target;wherein the first collimator, the low energy detector array and a target point (O) bombarded by the electron beam are located in a first plane; andwherein the second collimator, the high energy detector array and the target point bombarded by the electron beam are located in a second plane. 2. The X-ray fluoroscopic imaging system according to claim 1, wherein the angles between the directions in which the first and/or second collimators are disposed and the electron beam bombarding the target are 30° to 150°. 3. The X-ray fluoroscopic imaging system according to claim 1, wherein the angle between the axis of the electron accelerator and the inspection passage is less than 60°. 4. The X-ray fluoroscopic imaging system according to claim 1, wherein the first and second collimators are located on the same side of the axis (L) of the electron beam. 5. The X-ray fluoroscopic imaging system according to claim 1, wherein the axis of the electron accelerator is parallel to the inspection passage. 6. The X-ray fluoroscopic imaging system according to claim 1, wherein the angle between the central symmetric line of the first and second collimators and the inspection passage is larger than 45°. 7. The X-ray fluoroscopic imaging system according to claim 1, wherein the central symmetric line of the first and second collimators is perpendicular to the inspection passage. 8. The X-ray fluoroscopic imaging system according to claim 1, wherein the low and high energy detector arrays are in a linear type arrangement, a segmented linear arrangement, a standard L type arrangement or a C type arrangement, and are constituted by a plurality of low and high energy detectors respectively. 9. The X-ray fluoroscopic imaging system according to claim 1, wherein the low and high energy detector arrays are a plurality of detectors arranged in one row or a plurality of rows respectively. 10. The X-ray fluoroscopic imaging system according to claim 1, further comprising:a signal analyzing and image processing subsystem (7) for receiving signals from the low and high energy detector arrays and generating a fluoroscopic image finally by computation and analysis; anda power supply and control subsystem (6) for providing power and control to the operation of the X-ray fluoroscopic imaging system. 11. The X-ray fluoroscopic imaging system according to claim 1, further comprising:a detector arm support (9) for the mounting and fixation of detectors, the detector arm support being formed into an arrangement structure of linear type, segmented linear type, standard L type or C type. 12. The X-ray fluoroscopic imaging system according to claim 11, further comprising:an adjustable fixing apparatus (11) for fixing the detector arm support on the ground independently. 13. The X-ray fluoroscopic imaging system according to claim 1, further comprising any combination of the followings:a conveying apparatus (10) for dragging the inspected object to pass through the inspection passage at a given speed;a scatter shielding structure (12) disposed on one side or both sides of the inspection passage;an equipment room (13) for the mounting and fixation of apparatuses such as the electron accelerator and the like;a control room (14) for providing an equipment operation and working place to the working staffs of the system; anda ramp (24) for increasing the height of the inspected object. 14. The X-ray fluoroscopic imaging system according to claim 1, comprising a plurality of collimators and a plurality of corresponding detector arrays. 15. The X-ray fluoroscopic imaging system according to claim 1, wherein the electron accelerator is a single energy accelerator, a double energy accelerator or a multiple energy accelerator, and the detector arrays are single energy detector arrays, double energy detector arrays or multiple energy detector arrays correspondingly. 16. A combined and fixed type X-ray fluoroscopic imaging system, comprising:the X-ray fluoroscopic imaging system according to claim 1;an equipment room (13) fixed to the ground on one side of the inspection passage and having the electron accelerator and the shielding collimator apparatus mounted therein, the first and second collimators facing the inspection passage at different angles;a conveying apparatus (10) mounted in the inspection passage;a first and second detector arm supports (9) disposed on the other side of the inspection passage, fixed to the ground by an adjustable fixing apparatus, and having the low and high energy detector arrays mounted therein respectively;a scatter shielding structure (12) disposed between the equipment room and the inspection passage; anda control room (14) fixed to the ground, having the signal analyzing and image processing subsystem as well as the power supply and control subsystem mounted therein, and controlling the combined and fixed type X-ray fluoroscopic imaging system. 17. A track moving type X-ray fluoroscopic imaging system, comprising:the X-ray fluoroscopic imaging system according to claim 1;a plurality of tracks (20) disposed in parallel, the inspection passage being disposed between two adjacent tracks;a moving apparatus (21) disposed on the tracks;an equipment room (13) disposed on the tracks on one side of the inspection passage via the moving apparatus and having the electron accelerator and the shielding collimator apparatus mounted therein, the first and second collimators facing the inspection passage at different angles;two L type detector arm supports (9), a vertical segment bottoms thereof being disposed on the tracks on the other side of the inspection passage via the moving apparatus, the other ends being connected and fixed to the top of the equipment room, and the low and high energy detector arrays being mounted therein respectively; anda control room (14) fixed to the ground, having the signal analyzing and image processing subsystem as well as the power supply and control subsystem mounted therein, and controlling the track moving type X-ray fluoroscopic imaging system. 18. A vehicle-mounted moving type X-ray fluoroscopic imaging system, comprising:the X-ray fluoroscopic imaging system according to claim 1; anda chassis vehicle (30), and an X-ray source cabin (32), an equipment cabin (33), a working cabin (34), a low energy detector arm support system and a high energy detector arm support system mounted on the chassis vehicle;wherein the electron accelerator and the shielding collimator apparatus are mounted in the X-ray source cabin, and low and high energy X-ray beams are extracted to one side of the chassis vehicle at different angles through the first and second collimators respectively;wherein the low energy detector arm support system has the low energy detector array mounted therein, and in a working state, the low energy detector arm support system is opened on one side of the chassis vehicle, forms a “gate” type structure with the chassis vehicle, and makes the low energy detector array locate in the first plane in which the first collimator situates, and in a non-working state, the low energy detector arm support system is folded and stored on the top of the chassis vehicle;wherein the high energy detector arm support system has the high energy detector array mounted therein, and in a working state, the high energy detector arm support system is opened on one side of the chassis vehicle, forms a “gate” type structure with the chassis vehicle, and makes the high energy detector array locate in the second plane in which the second collimator situates, and in a non-working state, the high energy detector arm support system is folded and stored on the top of the chassis vehicle;wherein the low and high energy detector arm support systems are located on the same side of the chassis vehicle and form two “gate” type structures one after another with the chassis vehicle, and an internal passage formed by the two “gate” type structures becomes the inspection passage;wherein the equipment cabin has the power supply and control subsystem as well as the signal analyzing and image processing subsystem mounted therein; andwherein the working cabin has system operation and office equipments mounted therein and controls the vehicle-mounted moving type X-ray fluoroscopic imaging system.