Alignment Method of Radiation Source and Detector and Detection System

Abstract

The present invention provides an alignment method for a radiation source and a detector, comprising: a magnetic receiving device receives a magnetic signal emitted by a magnetic generating device and generates an electrical signal; based on the electrical signal, the target position coordinates and target attitude data of the magnetic receiving device relative to the magnetic generating device are obtained; based on the target position coordinates and the target attitude data, the central position coordinates of the center point in the detection area and the irradiation position coordinates of the X-ray irradiation point are obtained, and based on the central position coordinates and the irradiation position coordinates, the distance deviation value between the radiation source and the detector is obtained, and, based on the target attitude data, the angle deviation value between the radiation source and the detector is obtained; the alignment between the radiation source and the detector is achieved according to the angle deviation value and the distance deviation value. Through the alignment method provided by the present invention, the problems of poor positioning accuracy, restricted operation and poor customer confidentiality existing in the existing alignment methods are solved.

Description

Technical Field

[0001] The present invention relates to the field of X-ray detection, and particularly to an alignment method for a radiation source and a detector and a detection system. Background Art

[0002] In the intraoral dental market, when orthodontics or tooth extraction is performed, it is necessary to examine the condition of teeth and related tissues to assist doctors in diagnosis. Usually, an intraoral detector and a handheld X-ray source are used to obtain image information of teeth and related tissues. When the handheld X-ray source irradiates the intraoral detector, alignment operation is required. If not aligned, it will result in poor image shooting effect and even retaking is needed.

[0003] Currently, the commonly used alignment methods include: 1) Using infrared or visible light to indicate the orientation or area of the radiation field. However, since the intraoral detector is placed in the mouth, during the alignment process, it will be blocked, and it needs to be aligned by visual inspection by humans, thus the alignment accuracy cannot be guaranteed. 2) Adding Mark points on the intraoral detector and using the method of visual positioning for alignment. However, using this method requires the Mark points on the intraoral detector to be exposed, so the operation is restricted. Moreover, during the detection process, photography is required, which is not conducive to privacy protection. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide an alignment method for a radiation source and a detector and a detection system, which is used to solve the problems of poor positioning accuracy, restricted operation and poor customer confidentiality existing in the existing alignment methods.

[0005] To achieve the above object and other related objects, the present invention provides an alignment method for a radiation source and a detector. A magnetic generating device is installed at the outlet of the radiation source, and a magnetic receiving device is installed in the detection area of the detector. The alignment method includes:

[0006] The magnetic receiving device receives the magnetic signal emitted by the magnetic generating device and generates an electrical signal;

[0007] Based on the electrical signal, obtain the target position coordinates and target attitude data of the magnetic receiving device relative to the magnetic generating device;

[0008] Based on the target position coordinates and the target attitude data, obtain the central position coordinates of the center point in the detection area and the irradiation position coordinates of the X-ray irradiation point, and based on the central position coordinates and the irradiation position coordinates, obtain the distance deviation value between the radiation source and the detector, and based on the target attitude data, obtain the angle deviation value between the radiation source and the detector;

[0009] Align the ray source and the detector according to the angle deviation value and the distance deviation value.

[0010] Optionally, the method for obtaining the target position coordinates and target attitude data of the magnetic receiving device relative to the magnetic generating device based on the electrical signal includes:

[0011] Obtain the target magnetic induction intensity at the position where the magnetic receiving device is located based on the electrical signal;

[0012] Obtain the target position coordinates and target attitude data of the magnetic receiving device relative to the magnetic generating device based on the target magnetic induction intensity and the magnetic dipole model.

[0013] Optionally, the method for obtaining the target position coordinates and target attitude data of the magnetic receiving device relative to the magnetic generating device based on the target magnetic induction intensity and the magnetic dipole model includes:

[0014] Decompose the target magnetic induction intensity into three orthogonal components on the coordinate axes, and obtain the relationship between the three orthogonal components and the target position coordinates according to the magnetic dipole model;

[0015] Obtain the relationship between the electrical signal and the components of the target magnetic induction intensity on the XYZ three axes according to the electromagnetic induction law;

[0016] Establish the relationship between the magnetic induction intensity at the position where the magnetic generating device is located and the components of the target magnetic induction intensity on the XYZ three axes by using the target attitude data;

[0017] Calculate the target position coordinates and the target attitude data based on the above three relationships.

[0018] Optionally, the method for obtaining the angle deviation value between the ray source and the detector based on the target attitude data includes:

[0019] Establish a coordinate system with the center point of the magnetic generating device as the coordinate origin, and the X-ray generated by the ray source passes through the coordinate origin at a first preset angle;

[0020] Take any point on the X-ray as a ray point, and rotate the ray point in the established coordinate system based on the target attitude data and the second preset angle between the magnetic receiving device and the detector;

[0021] Obtain the angle deviation value between the ray source and the detector based on the angle between the ray point after two rotations and the Z axis of the established coordinate system.

[0022] Optionally, the method for aligning the ray source and the detector according to the angle deviation value and the distance deviation value includes: judging whether the ray source and the detector are aligned according to the angle deviation value and the distance deviation value, and when they are not aligned, adjusting the ray source and / or the detector according to the angle deviation value and the distance deviation value.

[0023] Optionally, the method for judging whether the ray source and the detector are aligned according to the distance deviation value and the angle deviation value includes:

[0024] If both the distance deviation value and the angle deviation value are 0, it indicates that the ray source and the detector are already aligned; otherwise, it indicates that the ray source and the detector are not aligned.

[0025] Optionally, the alignment method further includes the step of displaying the distance deviation value and the angle deviation value.

[0026] The present invention also provides a detection system for implementing the alignment method as described in any one of the above. The detection system includes: a ray source, a magnetic generating device, a detector, and at least one magnetic receiving device. Among them, the ray source includes an X-ray emitting device and a first processing unit, and the detector includes a detection device with a detection area and a second processing unit;

[0027] The X-ray emitting device is connected to the first processing unit and is used to emit X-rays under the control of the first processing unit; the first processing unit is wirelessly connected to the second processing unit and is used to receive and process the target magnetic induction intensity from the second processing unit to obtain the angle deviation value and the distance deviation value between the ray source and the detector;

[0028] The magnetic generating device is installed at the outlet of the X-ray emitting device and is connected to the first processing unit, and is used to emit a magnetic signal under the control of the first processing unit;

[0029] The detection device is connected to the second processing unit and is used to detect X-rays and convert them into image signals and send them to the second processing unit; the second processing unit obtains the target magnetic induction intensity of the magnetic receiving device relative to the magnetic generating device based on the received electrical signal and sends it to the first processing unit, and generates a detection image based on the received image signal;

[0030] The magnetic receiving device is installed in the detection area of the detection device and is used to receive the magnetic signal emitted by the magnetic generating device and generate an electrical signal.

[0031] Optionally, the ray source further includes a display unit connected to the first processing unit for displaying the angle deviation value and the distance deviation value.

[0032] Optionally, the magnetic generating device includes at least one transmitting coil.

[0033] As described above, the alignment method and detection system of the ray source and detector of the present invention can accurately calculate the angle deviation value and the distance deviation value of the ray source and the detector based on the electromagnetic positioning technology, ignoring human body obstacles, so as to conveniently achieve the alignment operation and attitude correction, increasing customer satisfaction; moreover, the magnetic field intensity generated by the magnetic generating device is low, and the low-intensity magnetic field has no irritation and harm to patients; compared with the alignment method based on infrared light or visible light, the alignment method of the ray source and detector of the present invention has higher positioning accuracy and more convenient operation; compared with the alignment method based on visual positioning, the alignment method of the present invention has no operation restrictions and good customer confidentiality. Description of the Drawings

[0034] Figure 1 It shows a flowchart of the alignment method of the present invention.

[0035] Figure 2 It shows a schematic coordinate system diagram of the magnetic generating device, the magnetic receiving device and the detector of the present invention.

[0036] Figure 3 It shows a schematic diagram of solving the coordinates of the irradiation point of the present invention.

[0037] Figure 4 It shows a schematic structural diagram of the detection system of the present invention.

[0038] Description of Component Numbers

[0039] 10 Ray source

[0040] 11 X-ray emitting device

[0041] 12 First processing unit

[0042] 121 First processing module

[0043] 122 D / A conversion module

[0044] 123 Driving module

[0045] 13 Display unit

[0046] 20 Magnetic generating device

[0047] 30 Detector

[0048] 31 Detection device

[0049] 32 Second processing unit

[0050] 321 Second processing module

[0051] 322 Filtering and amplifying module

[0052] 323 A / D conversion module

[0053] 40 Magnetic receiving device Detailed implementation manners

[0054] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0055] Please refer to Figures 1 to 4 . It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Although only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation, the form, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout form may also be more complex.

[0056] As Figure 1 shown, this embodiment provides an alignment method for a radiation source and a detector. The alignment method includes: step 1), step 2), step 3), and step 4); wherein, a magnetic generating device 20 is installed at the outlet of the radiation source 10, and a magnetic receiving device 40 is installed within the detection area of the detector 30.

[0057] Step 1) The magnetic receiving device 40 receives the magnetic signal emitted by the magnetic generating device 20 and generates an electrical signal.

[0058] In this embodiment, the electrical signal is the induced electromotive force E generated by the magnetic receiving device 40 based on the magnetic signal. The induced electromotive force E is relatively weak and can be amplified.

[0059] Step 2) Based on the electrical signal, obtain the target position coordinates (x1, y1, z1) and target attitude data (α1, β1, γ1) of the magnetic receiving device 40 relative to the magnetic generating device 20.

[0060] Specifically, the method for obtaining the target position coordinates (x1, y1, z1) and target attitude data (α1, β1, γ1) of the magnetic receiving device 40 relative to the magnetic generating device 20 based on the electrical signal includes: step 21) and step 22).

[0061] Step 21) Obtain the target magnetic induction intensity B at the position where the magnetic receiving device 40 is located based on the electrical signal.

[0062] In this embodiment, the value of the induced electromotive force E is obtained by measurement, and the magnitude of the target magnetic induction intensity B is calculated through the mathematical expression of Faraday's law of electromagnetic induction.

[0063] Step 22) Obtain the target position coordinates (x1, y1, z1) and target attitude data (α1, β1, γ1) of the magnetic receiving device 40 relative to the magnetic generating device 20 based on the target magnetic induction intensity B and the magnetic dipole model.

[0064] More specifically, the method for obtaining the target position coordinates and target attitude data of the magnetic receiving device relative to the magnetic generating device based on the target magnetic induction intensity and the magnetic dipole model includes:

[0065] a) Decompose the target magnetic induction intensity B into three orthogonal components Bx, By, and Bz on the coordinate axes XYZ, and obtain the relational expressions between the three orthogonal components Bx, By, and Bz and the target position coordinates (x1, y1, z1) according to the magnetic dipole model.

[0066] In this embodiment, coordinate systems O-XYZ, O-X’Y’Z’, O-xyz are established as shown. O-XYZ is the coordinate system established with the center point of the magnetic generating device 20 as the coordinate origin, O-X’Y’Z’ is the coordinate system established with the center point of the magnetic receiving device 40 as the coordinate origin, and O-xyz is the coordinate system established with the center point of the detector 30 as the coordinate origin. In the coordinate system O-XYZ, the coordinates of the magnetic receiving device 40 are (x1, y1, z1), and the relational expressions between the orthogonal components Bx, By, and Bz of the target magnetic induction intensity B and the target position coordinates (x1, y1, z1) can be expressed as: Figure 2

[0067]

[0068]

[0069]

[0070] Where, m 2 +n 2 +p 2 =1, B T is a constant related to the magnetic field, and the center coordinates of the magnetic dipole are (0, 0, 0).

[0071] b) Obtain the relational expression between the electrical signal and the components of the target magnetic induction intensity B on the XYZ three axes according to the law of electromagnetic induction.

[0072] Specifically: The signal emitted by the magnetic generating device 20 is a sine signal with a known frequency, then the magnetic induction intensity B' at the position of the magnetic generating device 20 can be expressed as:

[0073]

[0074] Therefore, the relational expression between the induced electromotive force E and the components of the target magnetic induction intensity B on the XYZ three axes:

[0075]

[0076]

[0077]

[0078] c) Use the target attitude data (α1, β1, γ1) to establish the relational expression between the magnetic induction intensity B' at the position of the magnetic generating device 20 and the components of the target magnetic induction intensity B on the XYZ three axes; wherein, the target attitude data (α1, β1, γ1) includes the first azimuth angle α1, the first pitch angle β1 and the first roll angle γ1, Rx(α1) represents the transformation matrix for the magnetic receiving device 40 to rotate by an angle α1 in the positive X-axis direction; Ry(β1) represents the transformation matrix for the magnetic receiving device 40 to rotate by an angle β1 in the positive Y-axis direction; Rz(γ1) represents the transformation matrix for the magnetic receiving device 40 to rotate by an angle γ1 in the positive Z-axis direction, then the specific formulas of Rx(α1), Ry(β1), and Rz(γ1) are as follows:

[0079]

[0080]

[0081]

[0082] The total rotation matrix is:

[0083]

[0084] The relational expression between the magnetic induction intensity B' at the position of the magnetic generating device 20 and the components of the target magnetic induction intensity B on the XYZ three axes:

[0085]

[0086] Among them, the direction information (m, n, p) of the magnetic generating device 20 in a), b), and c) is known, (Ex, Ey, Ez) can be calculated according to the induced voltage E generated by the magnetic receiving device 40, ω, Nx, Ny, Nz, Sx, Sy, Sz are constants that can be calculated. After measuring the amplitude of the electrical signal E, a system of equations is established by combining the above equations, and the target position coordinates (x1, y1, z1) and target attitude data (α1, β1, γ1) of the magnetic receiving device can be obtained.

[0087] Step 3) Based on the target position coordinates and the target attitude data, obtain the central position coordinates of the center point in the detection area and the irradiation position coordinates of the X-ray irradiation point, and based on the central position coordinates and the irradiation position coordinates, obtain the distance deviation value between the ray source and the detector, and, based on the target attitude data, obtain the angle deviation value between the ray source and the detector.

[0088] Specifically, based on the target attitude data (α1, β1, γ1), obtain the angle deviation value between the ray source 10 and the detector 30 The method includes: establishing a coordinate system with the center point of the magnetic generating device 20 as the coordinate origin, and the X-ray generated by the ray source 10 at a first preset angle Pass through the coordinate origin O; take any point on the X-ray as the ray point p, and rotate the ray point p respectively in the established coordinate system based on the target attitude data (x1, y1, z1) and the second preset angle (α2, β2, γ2) between the magnetic receiving device 40 and the detector 30; obtain the angle deviation value between the ray source 10 and the detector 30 based on the angle between the ray point p after two rotations and the Z-axis of the established coordinate system

[0089] Such as Figure 2 As shown, in this embodiment, the ray point p rotates by an angle α1 around the X-axis, rotates by an angle β1 around the Y-axis, and rotates by an angle γ1 around the Z-axis, so that the direction of the ray point p is the same as the direction of the magnetic receiving device 40, that is, the three directions of the XYZ three axes of the ray point p in the coordinate system O-XYZ are the same as the directions of the X', Y', and Z' three axes in the coordinate system O-X'Y'Z'. The coordinates of the ray point p in the O-XYZ coordinate system are (X1, Y1, Z1), and the coordinates in the O-X'Y'Z' coordinate system are (X2, Y2, Z2). The distance between the ray point p and the coordinate origin O is D.

[0090]

[0091]

[0092]

[0093]

[0094] Obtained by the above formula wherein, is the angle between the required ray source 10 and the magnetic receiving device 40.

[0095] After the direction of the ray point p is the same as the axial directions of the three axes of the coordinate system O-X’Y’Z’, then rotate it so that its direction is the same as the directions of the three axes x, y, and z in the coordinate system O-xyz where the detector is located. In the coordinate system O-xyz, the z-axis is perpendicular to the plane where the detector 30 is located, and the x-axis and y-axis are respectively parallel to the straight lines where the two sides of the detector 30 are located. At this time, the rotation angle of the ray point p is the second preset angle (α2, β2, γ2) between the magnetic receiving device 40 and the detector 30. Among them, Rx(α2) represents the transformation matrix for the magnetic receiving device 40 to rotate by an angle α2 in the positive direction of the X-axis; Ry(β2) represents the transformation matrix for the magnetic receiving device 40 to rotate by an angle β2 in the positive direction of the Y-axis, and Rz(γ1) represents the transformation matrix for the magnetic receiving device 40 to rotate by an angle γ2 in the positive direction of the Z-axis. Then the specific formulas of Rx(α2), Ry(β2), and Rz(γ2) are as follows:

[0096]

[0097]

[0098]

[0099] Total rotation matrix:

[0100]

[0101] The coordinates of the ray point p in the O-zyz coordinate system are (X3, Y3, Z3), and the distance between the ray point p and the coordinate origin O is D.

[0102]

[0103]

[0104]

[0105]

[0106] Can be obtained by the above formula wherein, is the included angle between the required X-ray and the plane where the detector is located.

[0107] As Figure 3 shown, the angle deviation value is the included angle between the X-ray and the perpendicular line to the plane where the detector is located, and the sum with the included angle between the X-ray and the detector is 90°. Therefore, according to the obtained the angle deviation value can be obtained.

[0108] In this embodiment, a perpendicular line is drawn from the coordinate origin O to the plane where the detector is located, and the coordinates of the foot of the perpendicular D are (x2, y2, z2). Since the included angle between the X-ray and the plane where the detector is located the distance OA between the center point A and the coordinate origin is known. According to the included angle and the distance OA, the irradiation position coordinates (x3, y3, z3) of the irradiation point B can be obtained. In this embodiment, the target coordinates (x1, y1, z1) of the magnetic receiving device 40 are obtained. According to the distances a, b, c of the magnetic receiving device 40 and the center point in the xyz axis directions, the center position coordinates (x1 + a, y1 + b, z1 + c) of the center point can be obtained. Therefore, according to the irradiation position coordinates (x3, y3, z3) and the center position coordinates (x1 + a, y1 + b, z1 + c), the distance deviation value is obtained.

[0109] Step 4) Align the ray source and the detector according to the angle deviation value and the distance deviation value.

[0110] Specifically, the method for aligning the ray source 10 and the detector 30 according to the angle deviation value and the distance deviation value includes: judging whether the ray source 10 and the detector 30 are aligned according to the angle deviation value and the distance deviation value, and when not aligned, adjusting the ray source 10 and / or the detector 30 according to the angle deviation value and the distance deviation value.

[0111] More specifically, the method for judging whether the ray source 10 and the detector 30 are aligned according to the distance deviation value and the angle deviation value includes:

[0112] If both the distance deviation value and the angle deviation value are 0, it means that the ray source 10 and the detector 30 are already aligned; otherwise, it means that the ray source 10 and the detector 30 are not aligned.

[0113] Specifically, the alignment method further includes: displaying the distance deviation value and the angle deviation value step.

[0114] In this embodiment, after the distance deviation value and the angle deviation value are displayed, the operator can adjust the radiation source 10 and / or the detector 30 according to the displayed data.

[0115] Correspondingly, this embodiment further provides a detection system for implementing the above alignment method. The detection system includes a radiation source 10, a magnetic generation device 20, a detector 30, and at least one magnetic receiving device 40. Among them, the radiation source 10 includes an X-ray emission device 11 and a first processing unit 12, and the detector 30 includes a detection device 31 with a detection area and a second processing unit 32.

[0116] The X-ray emission device 11 is connected to the first processing unit 12 and is used to emit X-rays under the control of the first processing unit 12; the first processing unit 12 is wirelessly connected to the second processing unit 32 and is used to receive and process the target magnetic induction intensity from the second processing unit 32 to obtain the angle deviation value and the distance deviation value between the radiation source 10 and the detector 30.

[0117] Further, the first processing unit 12 includes a first processing module 121, a D / A conversion module 122, and a driving module 123. The first processing module 121 is wirelessly connected to the second processing unit 32 and is connected to the X-ray emission device 11, the D / A conversion module 122, and the display unit 13. It is used to receive and process the target magnetic induction intensity from the second processing module 321 to obtain the angle deviation value and the distance deviation value between the radiation source 10 and the detector 30, and control the X-ray emission device 11 to emit X-rays, and generate a control signal to be transmitted to the D / A conversion module; the D / A conversion module 122 converts the digital signal from the first processing module 121 into an analog signal and transmits it to the driving module 123, and the driving module 123 generates a driving signal to drive the magnetic generation device 20 to generate a magnetic signal.

[0118] In this embodiment, the radiation source 10 includes a handheld radiation source or a radiation source supported by a rack. When it is necessary to adjust the radiation source 10, the handheld radiation source can be adjusted manually or the rack can be controlled by the first processing module 121 for adjustment.

[0119] The magnetic generating device 20 is installed at the outlet of the X-ray emitting device 11 and is connected to the first processing unit 12, and is configured to emit a magnetic signal under the control of the first processing unit 12.

[0120] Specifically, the magnetic generating device 20 includes at least one transmitting coil, usually at least two coils, and the axes of the two transmitting coils are perpendicular to each other. Optionally, in this embodiment, the number of the transmitting coils is three, and the three transmitting coils are mutually orthogonal and concentric circular coils, and the center point thereof coincides with the coordinate origin of the coordinate system, and is configured to emit a magnetic signal with a specific power, frequency, and phase.

[0121] The detection device 31 is connected to the second processing unit 32, and is configured to detect X-rays and convert the same into an image signal and send the image signal to the second processing unit; the second processing unit 32 obtains the target magnetic induction intensity of the magnetic receiving device 40 relative to the magnetic generating device 20 based on the received electrical signal and sends the target magnetic induction intensity to the first processing unit 12, and generates a detection image based on the received image signal.

[0122] In this embodiment, the detection device 31 is placed in the oral cavity to obtain an image signal of the oral cavity.

[0123] Further, the second processing unit 32 includes a second processing module 321, a filtering and amplifying module 322, and an A / D conversion module 323. The second processing module 321 is connected to the A / D conversion module 323 and the detection device 31, and is wirelessly connected to the first processing module 321, and is configured to receive the electrical signal from the A / D conversion module, process the electrical signal to obtain the target magnetic induction intensity, and transmit the magnetic induction intensity to the first processing module 321 by means of wireless communication. At the same time, the second processing module 321 is further configured to receive and process the received image signal to generate a detection image; the filtering and amplifying module 322 amplifies the electrical signal generated by the magnetic receiving device 40, and transmits the amplified electrical signal to the A / D conversion module 323, and the A / D conversion module 323 converts the received analog signal into a digital signal and transmits the digital signal to the second processing unit 32.

[0124] In this embodiment, data transmission is realized between the second processing module 321 and the first processing module 121 by means of wireless communication, and the wireless communication method includes a Bluetooth mode or a WIFI mode, and in actual work, it can be selected according to needs.

[0125] The magnetic receiving device 40 is installed in the detection area of the detection device 32, and is configured to receive the magnetic signal emitted by the magnetic generating device 20 and generate an electrical signal.

[0126] In this embodiment, the number of the magnetic receiving devices 40 is at least one, and the magnetic receiving devices 40 include, but are not limited to, magnetic sensors or receiving coils. In this embodiment, only one magnetic receiving device 40 is required to determine the positional relationship between the center point and the magnetic generating device 20. However, in order to improve the positioning accuracy and prevent the situation where the positioning result is incorrect due to interference with the magnetic receiving device 40, three or more magnetic receiving devices 40 are provided. If one magnetic receiving device 40 is interfered with, it will not affect the judgment of the center point position, thereby improving the stability.

[0127] Specifically, the radiation source 10 further includes a display unit 13, which is connected to the first processing unit 121 and is used to display the angle deviation value and the distance deviation value.

[0128] In this embodiment, the display unit 13 includes, but is not limited to, a display screen or a projector. Optionally, in this embodiment, a display screen is selected, and the display screen can be arranged on the handheld radiation source.

[0129] In summary, for an alignment method and a detection system of a radiation source and a detector according to the present invention, based on the electromagnetic positioning technology, the angle deviation value and the distance deviation value of the radiation source and the detector can be accurately calculated regardless of human body obstacles, so that the alignment operation and the attitude correction can be conveniently realized, thereby increasing customer satisfaction; moreover, the magnetic field intensity generated by the magnetic generating device is low, and there is no stimulation or harm to the patient; compared with the method indicated by infrared light or visible light, the alignment method of the radiation source and the detector of the present invention has higher positioning accuracy and is more convenient to operate; compared with the visual positioning method, the alignment method of the present invention has no operation limitation and good customer confidentiality. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0130] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A method for aligning a radiation source and a detector, characterized in that, A magnetic generating device is installed at the outlet of the ray source, and a magnetic receiving device is installed within the detection area of the detector. The alignment method includes: The magnetic receiving device receives the magnetic signal emitted by the magnetic generating device and generates an electrical signal; Based on the electrical signal, obtain the target position coordinates and target attitude data of the magnetic receiving device relative to the magnetic generating device; Based on the target position coordinates and the target attitude data, obtain the central position coordinates of the center point within the detection area and the irradiation position coordinates of the X-ray irradiation point, and based on the central position coordinates and the irradiation position coordinates, obtain the distance deviation value between the ray source and the detector, and, based on the target attitude data, obtain the angle deviation value between the ray source and the detector; wherein, a coordinate system is established with the center point of the magnetic generating device as the coordinate origin, and the X-ray generated by the ray source passes through the coordinate origin at a first preset angle; take any point on the X-ray as the ray point, and rotate the ray point in the established coordinate system based on the target attitude data and the second preset angle between the magnetic receiving device and the detector; obtain the angle deviation value between the ray source and the detector based on the angle between the ray point after two rotations and the Z-axis of the established coordinate system; Realize the alignment between the ray source and the detector according to the angle deviation value and the distance deviation value.

2. The alignment method of the ray source and the detector according to claim 1, characterized in that, The method for obtaining the target position coordinates and target attitude data of the magnetic receiving device relative to the magnetic generating device based on the electrical signal includes: Based on the electrical signal, obtain the target magnetic induction intensity at the position where the magnetic receiving device is located; Based on the target magnetic induction intensity and the magnetic dipole model, obtain the target position coordinates and target attitude data of the magnetic receiving device relative to the magnetic generating device.

3. The alignment method of the radiation source and the detector according to claim 2, characterized in that The method for obtaining the target position coordinates and target attitude data of the magnetic receiving device relative to the magnetic generating device based on the target magnetic induction intensity and the magnetic dipole model includes: Decompose the target magnetic induction intensity into three orthogonal components on the coordinate axes, and obtain the relationship between the three orthogonal components and the target position coordinates according to the magnetic dipole model; According to the electromagnetic induction law, obtain the relationship between the electrical signal and the components of the target magnetic induction intensity on the XYZ three axes; Use the target attitude data to establish the relationship between the magnetic induction intensity at the position where the magnetic generating device is located and the components of the target magnetic induction intensity on the XYZ three axes; Calculate the target position coordinates and the target attitude data based on the above three relationships.

4. The alignment method of the radiation source and the detector according to claim 1, characterized in that The method for realizing the alignment between the ray source and the detector according to the angle deviation value and the distance deviation value includes: judging whether the ray source and the detector are aligned according to the angle deviation value and the distance deviation value, and when not aligned, adjusting the ray source and / or the detector according to the angle deviation value and the distance deviation value.

5. The alignment method of the radiation source and the detector according to claim 4, characterized in that, The method for judging whether the ray source and the detector are aligned according to the distance deviation value and the angle deviation value includes: If both the distance deviation value and the angle deviation value are 0, it indicates that the ray source and the detector are aligned; otherwise, it indicates that the ray source and the detector are not aligned.

6. The alignment method of the ray source and the detector according to claim 1, characterized in that, The alignment method further includes a step of displaying the distance deviation value and the angle deviation value.

7. A detection system for implementing the alignment method according to any one of claims 1-6, characterized in that, The detection system includes a ray source, a magnetic generating device, a detector, and at least one magnetic receiving device. Among them, the ray source includes an X-ray emitting device and a first processing unit, and the detector includes a detection device with a detection area and a second processing unit; The X-ray emitting device is connected to the first processing unit and is used to emit X-rays under the control of the first processing unit; the first processing unit is wirelessly connected to the second processing unit and is used to receive and process the target magnetic induction intensity from the second processing unit to obtain the angle deviation value and the distance deviation value between the ray source and the detector. Among them, a coordinate system is established with the center point of the magnetic generating device as the coordinate origin, and the X-rays generated by the ray source pass through the coordinate origin at a first preset angle; any point on the X-ray is taken as a ray point, and the ray point is rotated respectively in the established coordinate system based on the target attitude data and the second preset angle between the magnetic receiving device and the detector; the angle deviation value between the ray source and the detector is obtained based on the angle between the ray point after two rotations and the Z-axis of the established coordinate system; The magnetic generating device is installed at the outlet of the X-ray emitting device and is connected to the first processing unit, and is used to emit a magnetic signal under the control of the first processing unit; The detection device is connected to the second processing unit and is used to detect X-rays and convert them into image signals and send them to the second processing unit; the second processing unit obtains the target magnetic induction intensity of the magnetic receiving device relative to the magnetic generating device based on the received electrical signal and sends it to the first processing unit, and generates a detection image based on the received image signal; The magnetic receiving device is installed in the detection area of the detection device and is used to receive the magnetic signal emitted by the magnetic generating device and generate an electrical signal.

8. The detection system according to claim 7, characterized in that, The ray source further includes a display unit, which is connected to the first processing unit and is used to display the angle deviation value and the distance deviation value.

9. The detection system according to claim 7, wherein The magnetic generating device includes at least 1 transmitting coil.

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