Scanner for X-ray transmission and back scattering integrated imaging system

Technical Field

The present invention relates to the field of the nuclear industry, and in particular relates to a X-ray transmission for the back scattering integrated imaging system of the scanner.

Background Art

X-ray imaging system as a widely accepted means of the main safety inspection technology, can realize a quick check of luggage and the like and various land, sea, airports goods inspection. The present X-ray imaging system mainly comprises a transmission and back scatter imaging in two ways. Transmission imaging main display heavy substance of the Image, is detecting firearms, metal cutting tool such as a powerful means of contraband, back scattering imaging can be useful in providing the tarmac surface is relatively low atomic number while the higher-density of the examined objects geometrical shape and space distribution feature, can effectively check the explosive, liquid, drugs and other contraband, back scattering imaging and transmission imaging combined comprehensive detection information can be obtained.

Transmission imaging system usually adopt the scanning mode, the transmission detector using linear array, can meet the high frequency scanning, high Image resolution; back scattering imaging system generally adopt the point scan mode, back scattering detector uses a larger area of the scintillator crystal (group), due to the back scattering signal weak, in order to guarantee a certain signal to noise ratio is very difficult to realize high-frequency scanning, back scattering Image space resolution is transmitting images of the plurality of difference.

At present, the best security check-oriented application with X-ray transmission at the same time and back scatter imaging function of the two functions. The general combining two function taken for equipment in series, X-ray transmission and back scatter imaging system requires the use of X-ray are independent of each other, the collimator and detector to accomplish material scanning detection, generate respective transmission and back scattering Image, is characterized in that the imaging time is long, the transmission Image with the back scattering Image space resolution is not consistent, the volume of the equipment difficulties.

In view of this, the positions of the invention.

Content of the invention

In against the defects of the prior art, the purpose of this invention is to provide a X-ray transmission used for the back-scattering integrated imaging system of the scanner, can realize the use of a machine at the same time X with transmission and back scatter imaging function.

The technical scheme of the present invention are as follows:

A X-ray transmission for the back scattering integrated imaging system of the scanner, including X light pipe, fixed platform housing and collimator; said fixed platform connected to the housing and the collimator; said X light pipe extended into said fixed platform and the casing; the collimator arranged circumferentially of the transmission scans the trough and back scatter scanning hole and can be rotated in order to make the light emission of X X ray passing through the transmission scans the trough or back scattering scanning hole, or make the light emission of X X ray interval through the transmission scans the trough and back scatter scanning hole.

Further, the X-ray transmission used with the back scattering integrated imaging system of the scanner, the fixed platform housing and the collimator are cone-shaped, the two connected to large end.

Further, the X-ray transmission used with the back scattering integrated imaging system of the scanner, and the collimator mouth-end of the inner shaft, the states the inner spindle through the motor bearing and the electric motor driving connection in order to obtain rotary power.

Further, the X-ray transmission used with the back scattering integrated imaging system of the scanner, the motor is connected with a position sensor.

Further, the X-ray transmission used with the back scattering integrated imaging system of the scanner, and the collimator of the end part of the fixed platform or mouth end of the shell is provided with a shielding the reinforcing structure.

Further, the X-ray transmission used with the back scattering integrated imaging system of the scanner, the shielding the reinforcing structure comprises a is convenient for overlapping of the shielding.

Further, the X-ray transmission used with the back scattering integrated imaging system of the scanner, the transmission scans the trough and back scatter scanning hole interval is set, the transmission scans the trough and back scatter scanning hole coplanar, and the plane of the collimator of the inner shaft with the axis of rotation vertical, X light pipe can be placed on the axis of rotation of the collimator.

Further, the X-ray transmission used with the back scattering integrated imaging system of the scanner, and the collimator interval and is provided with 3 a transmission scans the trough and 3 a back scattering scanning hole.

Further, the X-ray transmission used with the back scattering integrated imaging system of the scanner, transmission scans the trough the center of the flare angle is Δ θ=20°, adjacent transmission scanning groove included angle is 100°, adjacent transmission scans the trough at the middle of the back scattering scanning hole; said X light formed by the pipe for the ray beam should be strictly defined as Δ φ=50° the included angle of the fan-shaped beam.

The beneficial effect of the present invention are as follows:

(1) The rotation of the through the collimator, using a X-ray source can be are alternately supplied to the transmission and back scattering scanning ray, can effectively reduce the equipment cost;

(2) X-ray transmission to the back-scattering integrated imaging system using a radiation source, can effectively reduce the volume of the equipment;

(3) The rotation of the collimator in the course of a week, can complete the 3 times a mixture scanning and 3 the back scattering point scanning; the collimator speed is required is not high;

(4) The collimator and scanner is fixed platform by the outer lead made of copper, also can use the high strength steel housing with lead and the internal shielding layer together form. The collimator and scanner is fixed platform X-ray source is surrounded by the outer casing of the internal, can the overwhelming majority of undesirable ray shielding in the interior of the scanner.

Description of drawings

Figure 1 is the structure diagram of the present invention for X-ray transmission to the back-scattering whole imaging scanner.

Figure 2 is the assembly structure diagram of the invention at least one of the housing and the fixed platform.

Figure 3 is the invention of one embodiment transmission scans the trough and back scatter a scanning of the distribution structure.

Figure 4 is the schematic diagram of the present invention realize transmission function.

Figure 5 is the schematic diagram of the present invention back scattering function.

Figure 6 is one embodiment of the invention the working state of change chart at any time.

In the above Figure, 1, fixed platform housing; 2, collimator; 3, built-in collimator; 5, X light pipe; 6, back scattering scanning hole; 7, transmission scans the trough; 8, fixed platform; 9, inner shaft; 10, motor bearing; 11, motor; 12, position sensor; 14, back scatter detector; 15, an object to be measured; 16, the transmission detector.

Mode of execution

The Figure below and embodiment of the invention detailed description.

As shown in Figure 1, the invention provides a method for X-ray transmission to the back-scattering integrated imaging system of the scanner, the scanner is mounted in X-ray transmission and back scatter imaging system on the bench, including X light pipe 5, fixed platform housing 1 (with the fixed platform 8 connected) and a collimator 2; the fixed platform housing 1 and a collimator 2 connected; said X light pipe 5 extended into said fixed platform housing 1 installation; and the collimator 2 is arranged in the circumferential direction of the transmission scans the trough 7 and back scatter scanning hole 6 and can be rotated in order to make the light pipe X 5 X ray passes through the transmitting of the transmission scans the trough 7 or back scattering scanning hole 6, or make the X light pipe 5 emission of X ray interval through the transmission scans the trough 7 and back scatter scanning hole 6.

In this embodiment, the light pipe X 5 X-ray provided, through X light pipe 5 built-in collimator 3 with light pipe X 5 X-ray beam exit window will be restrained from angle 50° planar fan-shaped beam, fan-shaped beam through the collimator 2 on the transmission scans the trough 7 for generating small central angle of the fan-shaped beam transmission; fan-shaped X-ray beam through the collimator 2 on the scanning of the access holes for back scattering of straight line the shape shoots harness.

X-ray source comprises an X light pipe 5, cooling liquid, high-voltage power supply cable, a built-in collimator 3, exit window and the like. The light pipe X 5 X-ray issued, in X light pipe 5 built-in collimator 3 with common under the effect of the exit window, X-ray beam is restrained from angle 50° planar fan-shaped beam, for transmission and back scattering integrated imaging system provided with the scanning beam.

In the collimator 2 in the process of rotating the small central angle of the fan-shaped beam can be continuously from one end to the other end of the sweep, form the periodic line scanning; linear-ray beam can also be continuously from one end to the other end of the sweep, form the periodic point scanning. X light pipe 5 is located in the interior of the scanner, X light pipe 5 can be placed on the axis of the scanner, the scanner for transmission and back scatter imaging system respectively provide different forms of scanning ray. The collimator 2 around the X light pipe 5 focus rotary, X light pipe 5 output of the fan-shaped beam alternately through the collimator 2 on the circumference of the transmission scans the trough 7 and back scatter scanning hole 6 complete to the measured object 15 scanning, during transmission detector 16 and back scatter detector 14 are respectively to obtain the corresponding transmission, back scattering signal, the final form of the measured object 15 of the transmission and the back scattering images. SUMMARY of specific such as shown in the Figure. The collimator 2 in the process of rotation, the fan-shaped X-ray beam alternately through the transmission scans the trough 7 and back scatter scanning hole 6 to form a linear beam to the measured object 15 scanning, the collimator 2 by installing the rotary position of the electric motor 11 and the position of the sensor 12 obtain position information, can control the transmission and back scatter detector 14 obtains the corresponding transmission and back scatter signal, forming the object 15 of the transmission and the back scattering images.

The fixed platform housing 1 and a collimator 2 are cone-shaped, the two connected to large end.

The collimator 2 is rotatable mode, one end of the housing with the fixed platform 1 coupled together at one end, the other end of the rotatable inner shaft is sleeved 9 on, the external motor under the drive of the high-speed rotation. As shown in Figure 2, collimator 2 the small opening end set up the states the inner spindle 9, the states the inner spindle 9 by means of a motor bearing 10 with the electric motor 11 and the driving connection in order to obtain rotary power. The motor 11 is connected with a position sensor 12, to obtain current collimator 2 the rotary angle position.

In this embodiment, a rotating cycle can be completed in 3 scan, a scanning period corresponding to each of the scanner the central angle is 360° / 3=120°. Wherein transmission scans the trough 7 for corresponding to the central angle of the 20°, the included angle between adjacent scans the trough for 100°, the middle position between the adjacent scans the trough scattering scanning hole 6, back scattering scanning hole 6 of the scanning angle is in the range of 100° / 2=50°. In the premise of low scanning rate, transmission scans the trough 7 corresponding to the central angle can be appropriately reduced, in order to further increase the back scattering scanning hole 6 of the scanning angle range.

When the X-ray beam through the collimator 2 on the circumference of the transmission scans the trough 7 in the output, the transmission detector 16 is in a working state, obtaining the object 15 of the transmission signal and transmitting it to the transmission Image processing software, at this moment back scatter detector 14 is in the closed state; when the X-ray beam through the collimator 2 on the circumference of the back scattering scanning hole 6 output, back scatter detector 14 is in a working state, obtaining the object 15 back scattered signal and transmitting it to back scattering Image processing software, at this moment the transmission detector 16 is in the closed state; through the collimator 2 non-stop rotating, the bundle of rays from the collimator 2 on the transmission scans the trough 7 and back scatter scanning hole 6 alternately in the output, the transmission detector 16 with the back scatter detector 14 interval obtaining transmission with the back scattering signal, form the transmission decreases toward the first end and back scatter data in, and back scatter data transmission to the data in the reconstruction of the object to be measured are generated 15 of the transmission and the back scattering images. The scanner of the present invention can keep the transmission Image of the visual effect is not reduced, produced at the same time better signal to noise ratio and resolution has the back scattering images. Because the X-ray transmission and backscatter imaging system only uses one X-ray, can effectively reduce the equipment volume and reduce the cost.

Fixed platform 8 will be X ray source (X light pipe 5) fixed in the inside of the scanner, the outer shell of the can will not be required in the X-ray shielding the interior of the scanner. The collimator 2 and scanner is fixed platform housing 1 adopts the lead made of copper, also can use the high strength steel housing with lead and the internal shielding layer together form. The collimator 2 and scanner is fixed platform housing 1 in the X-ray source will be surrounded by the internal, can the overwhelming majority of undesirable ray shielding in the interior of the scanner. In order to enhance the shielding function, and the collimator 2 or fixed platform-opening end of the housing 1 is provided with a shielding of the end part of the reinforcing structure. Specifically, the shielding the reinforcing structure comprises a is convenient for overlapping of the shielding. When in use, the outer shell of the fixed platform 1 (shielding is fixed to the collimator 2 when on) or a collimator 2 (shielding is arranged on the fixed platform housing 1 when on) is inserted into the groove of the corresponding shield, in the ray direction of propagation of the fixed platform housing 1 and a collimator 2 is formed on the overlapping position, in order to achieve the maximum degree of X-ray shielding ability.

As shown in Figure 4, X-ray through the collimator 2 on the circumference of the transmission scans the trough 7 to form a linear beam output, transmission detector 16 is in a working state, back scatter detector 14 is in the closed state.

As shown in Figure 5, X-ray through the collimator 2 on the circumference of the back scattering scanning hole 6 to form a linear beam output, back scatter detector 14 is in the working state, the transmission detector 16 is in the closed state.

As shown in Figure 6, collimator 2 rotates a circle, X-ray from the collimator 2 on the circumference of the transmission scans the trough 7 and back scatter scanning hole 6 alternately in the output, to the measured object 15 is scanned. At the same time transmission detector 16 and back scatter detector 14 corresponding interval work, receives the transmission and back scatter signal. In the collimator 2 a rotating cycle, t1, t3, t5 moment, transmission scans the trough 7 in the X-ray output, at this moment the transmission detector 16 is in a working state, receives the transmission signal, back scatter detector 14 is in the closed state; in t2, t4, t6 moment, back scattering scanning hole 6 in the X-ray output, at this moment back scatter detector 14 is in a working state, receiving back scatter signal, transmission detector 16 is in the closed state.

The scanner of the present invention can be obtained first transmission and back scatter imaging of the linear beam from and back scatter point scanning beam. Secondly can make the X-ray transmission and back scatter imaging system only uses one X machine, so as to reduce the volume of the device, reducing the cost of the system. Furthermore can make the transmission and back scatter imaging system simultaneously obtains the transmission and back scattering images. In does not reduce the transmission Image visual effect under the conditions, obtain better back scattering images.

Obviously, the field of the present invention technical personnel can make various modifications and variations can not be separated from the spirit and scope of the invention. In this way, if the of the present invention these changes and modify belongs to the invention claim and its equivalent within the scope of the technology, the intention of the present invention also includes those changes and modify the inner.