Safety prompt system and method for implanted device in MR imaging system

Abstract

An embodiment of the present invention provides a safety prompt system and method for an implanted device in an MR imaging system, the safety prompt system comprising an indicating device, which indicates a predetermined safety boundary to indicate a positional relationship between the implanted device of an object under inspection and the safety boundary, wherein the position range defined by the safety boundary is located within a columnar space region within the main magnetic field spatial gradient intensity distribution region of the MR imaging system that allows the implanted device to enter.

Description

Technical Field

[0001] The present invention relates to the field of medical detection, and in particular to a safety prompt system and method for an implanted device in an MR imaging system, and a computer-readable storage medium. Background Art

[0002] Before using magnetic resonance (MR) imaging technology to image the human body, a safety assessment needs to be made for implanted devices in the human body, such as pacemakers, orthopedic implants, and puncture equipment, because these devices may cause safety problems during the MR imaging process. To avoid such problems, some hospitals have regulations prohibiting MR examinations for patients with implanted devices or specific types of implanted devices.

[0003] In recent years, more and more people choose to implant medical, orthopedic, and plastic devices in their bodies. It is predicted that by 2020, the number of patients with implanted devices in their bodies will increase by 71% compared to now. Therefore, restrictions on implanted devices may cause such patients to lose the opportunity to receive appropriate diagnosis and treatment, and will be detrimental to the popularization of MR imaging technology.

[0004] In the prior art, it is proposed to install a sensor on the implant device to monitor the characteristic changes of the implant device to judge the safety. This method requires improvements to the implant device itself. Another method is to set a pickup coil and judge the safety based on the correlation between the signal change of the pickup coil and the characteristic change of the implant device. This method has a large cost, and its main function is to detect safety problems in time when they occur. Both methods cannot intuitively indicate the safety of the implant device, so that safety accidents cannot be effectively avoided during operation.

[0005] It is necessary to provide a safety prompt system and method for an implanted device in an MR imaging system, which can provide an intuitive prompt in the MR imaging system as to whether the implanted device is in a safe area. Summary of the invention

[0006] An object of the present invention is to provide a safety prompt system and method for an implant device in an MR imaging system, which can provide an intuitive prompt in the MR imaging system as to whether the implant device is in a safe area.

[0007] An embodiment of the present invention provides a safety prompt method for an implanted device in an MR imaging system, comprising: indicating a predetermined safety boundary to represent the positional relationship between the implanted device of an object under inspection and the safety boundary, wherein the position range defined by the safety boundary is located within a columnar space region in the main magnetic field spatial gradient intensity distribution region of the MR imaging system that allows the implanted device to enter.

[0008] An embodiment of the present invention provides a safety prompt system for an implant device in an MR imaging system, comprising: an indication device, which indicates a predetermined safety boundary to indicate a positional relationship between the implant device of an object under inspection and the safety boundary, wherein the position range defined by the safety boundary is located within a columnar space region within the main magnetic field spatial gradient intensity distribution region of the MR imaging system, allowing the implant device to enter.

[0009] An exemplary embodiment of the present invention further provides a computer-readable storage medium for storing a computer program, wherein the computer program is installed on a computer system of an MR imaging system and is used to execute the following instructions:

[0010] Generate a boundary indication instruction based on a predetermined safety boundary, the safety boundary indicating a positional relationship between an implant device of the detected object and the safety boundary, wherein a position range defined by the safety boundary is located within a columnar space region within a main magnetic field spatial gradient intensity distribution region of the MR imaging system into which the implant device is allowed to enter;

[0011] The boundary indication instruction is sent to the indication device to control the indication device to indicate the safety boundary.

[0012] Other features and aspects will become apparent from the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention may be better understood by describing exemplary embodiments of the present invention in conjunction with the accompanying drawings, in which:

[0014] Figure 1 It is a structural schematic diagram of a safety prompt system for an implant device in an MR imaging system according to a first embodiment of the present invention;

[0015] Figure 2 A schematic diagram of the structure of a safety prompt system for an implant device provided in a second embodiment of the present invention;

[0016] Figure 3 A schematic block diagram of a safety prompt system for an implant device provided in accordance with a second embodiment of the present invention;

[0017] Figure 4 A schematic diagram of the structure of a safety prompt system for an implant device provided in a third embodiment of the present invention;

[0018] Figure 5 A schematic block diagram of a safety prompt system for an implant device provided in a third embodiment of the present invention;

[0019] Figure 6The block diagram of the MR imaging system is shown exemplarily;

[0020] Figure 7 The above is an example diagram of the main magnetic field spatial gradient intensity distribution of an MR imaging system. Figure 7 Below is a columnar space region that is determined based on the spatial gradient intensity distribution of the main magnetic field and allows the implant device to enter.

[0021] Figure 8 A flowchart of a safety prompt method for an implant device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention will be described below. It should be noted that in the specific description of these embodiments, in order to provide a concise description, it is impossible for this specification to provide a detailed description of all the features of the actual embodiments. It should be understood that in the actual implementation of any embodiment, just as in the process of any engineering project or design project, in order to achieve the specific goals of the developer and to meet system-related or business-related restrictions, various specific decisions are often made, and this will also change from one embodiment to another. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for ordinary technicians in the field related to the content disclosed by the present invention, some changes such as design, manufacturing or production based on the technical content disclosed in this disclosure are just conventional technical means, and should not be understood as insufficient content of this disclosure.

[0023] Unless otherwise defined, the technical or scientific terms used in the claims and the specification shall have the usual meaning understood by persons with ordinary skills in the technical field to which the invention belongs. The words "first", "second" and similar words used in the patent application specification and the claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limitation, but indicate the existence of at least one. "Include" or "comprises" and other similar words mean that the elements or objects appearing before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalent elements, and do not exclude other elements or objects. "Connected" or "connected" and other similar words are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0024] Embodiment 1

[0025] Figure 1This is a schematic diagram of the structure of a safety prompt system for an implant device in an MR imaging system according to a first embodiment of the present invention. Figure 6 A block diagram of the MR imaging system is shown as an example.

[0026] Combination Figure 1 , Figure 6 As shown, the above-mentioned MR imaging system includes a scanning device located in a scanning room 62, and the scanning device 62 includes a main magnet 621 for generating a main magnetic field B0, a gradient coil 622 for linearly changing the main magnetic field B0, a radio frequency coil 623 (which includes a radio frequency transmitting coil for exciting the detected object to generate magnetic resonance and a radio frequency receiving coil for receiving the magnetic resonance signal generated by the detected object), and a support bed for carrying the detected object, and the upper surface of the support bed forms a support surface 625 of the detected object. The hollow part of the main magnet 621 forms a scanning cavity 626, and the detected object and its support bed can move from the outside into the scanning cavity 626 to perform magnetic resonance imaging on the detected object. Among them, the main magnetic field B0 generated by the main magnet 621 causes the detected object in the scanning cavity to generate a longitudinal macroscopic magnetization vector.

[0027] The MR imaging system further includes a spectrometer 641, a radio frequency generator 642, and a gradient controller 643, etc., which are arranged in the equipment room 64. The spectrometer 641 is used to generate an imaging sequence, which includes radio frequency excitation pulses, gradient control pulses, etc.

[0028] The RF generator 642 is used to transmit the RF excitation pulse to the RF transmitting coil 623 to excite the longitudinal magnetization vector of the object to be detected to flip, thereby generating a transverse magnetization vector. After the RF excitation pulse ends, the transverse magnetization vector decays spirally around the external magnetic field at a fixed angular frequency to generate a free induction decay (FID) signal, i.e., a magnetic resonance signal. The gradient controller 643 is used to send the gradient control pulse to the gradient coil 622 to linearly superimpose the gradient magnetic field on the static magnetic field to achieve spatial positioning of the magnetic resonance signal. The magnetic resonance signal with spatial encoding information is collected by the RF receiving coil 624 for subsequent image reconstruction.

[0029] The above-mentioned MR imaging system further includes an operating station arranged in an operating room 66 of the operating room, and the operating station includes a computer system 661. The computer system 661 is used to generate an imaging sequence on the one hand, and to reconstruct an image based on the collected magnetic resonance signals on the other hand.

[0030] An embodiment of the present invention aims to provide a safety prompt system for an implant device, which can provide obvious safety prompts to the operator when the support bed carries the object to be detected from the outside of the scanning device into the scanning cavity 626, so that the operator can observe whether the implant device is in a safe area at any time, and make timely adjustments when observing that the implant device exceeds the safe area.

[0031] Combination Figure 1 , Figure 6 As shown, the safety prompt system for the implant device of this embodiment includes an indication device, which indicates a predetermined safety boundary to indicate the positional relationship between the implant device of the detected object and the safety boundary, wherein the position range defined by the safety boundary is located in a columnar space area in the main magnetic field spatial gradient intensity distribution area of ​​the scanning device of the MR imaging system that allows the implant device to enter.

[0032] The above main magnetic field spatial gradient intensity distribution area is determined by the main magnet 621 used by the MR imaging system, such as Figure 7 As shown, Figure 7 The above is an example diagram of the main magnetic field spatial gradient intensity distribution of an MR imaging system. Figure 7 Below is a columnar space region 75 that is determined based on the spatial gradient intensity distribution of the main magnetic field and allows the implant device to enter. Figure 7 The figure shows the spatial gradient field strength distribution of a 1.5T (Tesla) superconducting magnet. Figure 1 It is also generally disclosed in the corresponding product user manual.

[0033] In this embodiment, the safe area that allows the implant device to enter is a relatively low field strength distribution area, in which the main magnetic field spatial gradient intensity is less than the maximum magnetic induction intensity spatial change rate allowed by the implant device, for example, the main magnetic field spatial gradient intensity in the columnar space area 75 is less than 320 Gauss / cm. Figure 7 The area between the two straight lines 71 and 72 in the figure is the safety area, wherein the straight line 73 between the straight lines 71 and 72 can be understood as the diameter of the cross section of the columnar space area 75. Therefore, the safety area can be determined according to the distribution of the spatial gradient intensity of the main magnetic field, and the positional relationship between the implant device and the safety boundary can be further indicated by indicating a specific boundary in the safety area.

[0034] like Figure 1 As shown, the above-mentioned safety boundary is preferably the side surface of the above-mentioned columnar space area 75. The indicating device of this embodiment includes a projection device 11 installed in the scanning room of the MR imaging system, and the projection device 11 is used to project a cylindrical fog screen 12 that coincides with the side surface of the columnar space area in the main magnetic field spatial gradient intensity distribution area.

[0035] In this way, when the support bed carries the object to be detected 13 and moves relative to the scanning cavity, passing through the above-mentioned cylindrical fog screen 12, the operator can intuitively judge whether the implant device is located within the cylindrical fog screen 12 based on the position of the implant device 14 in the object to be detected 15, that is, whether it is located in the safe area of ​​the main magnetic field spatial gradient intensity distribution area.

[0036] Since the implant device 14 is generally located above the upper surface of the support bed, the columnar mist screen 12 can be projected only above the support surface 625 to form a cylindrical longitudinal section structure, such as a semi-cylindrical mist screen. According to the field intensity distribution of the main magnetic field shown in the embodiment of the present invention, a cylindrical space can be determined as the columnar space area 75 accordingly. In other embodiments, the cross section of the columnar space area 75 can also be other shapes, such as an irregular curved surface structure.

[0037] The projection device 11 may be disposed in a scanning room 62 of the MR imaging system, for example, installed above the scanning device.

[0038] Embodiment 2

[0039] Figure 2 A schematic diagram of the structure of a safety prompt system for an implant device provided in a second embodiment of the present invention. Figure 3 A schematic block diagram of a safety prompt system for an implant device provided in the second embodiment of the present invention. The safety prompt system for an implant device in this embodiment includes an indication device, which indicates a predetermined safety boundary to indicate the positional relationship between the implant device of the detected object and the safety boundary, wherein the position range defined by the safety boundary is located in a columnar space region that allows the implant device to enter in the main magnetic field spatial gradient intensity distribution area of ​​the MR imaging system. The above-mentioned columnar space region has been explained in the first embodiment and will not be repeated here.

[0040] The principles and implementation methods of this embodiment are similar to those of the first embodiment, except that:

[0041] Combination Figure 2 , Figure 6 , Figure 7 As shown, in this embodiment, the safety boundary includes vertical mapping lines of two opposite and parallel straight lines 751 and 752 on the side surface of the columnar space area 75 on the supporting surface 625 of the detected object 13.

[0042] The above-mentioned indicating device comprises a laser projection device 21 installed in the scanning room of the MR imaging system, and the laser projection device 21 is used to project two laser indicating lines 22 and 23 respectively coinciding with the two vertical mapping lines on the supporting surface 625 of the detected object 13.

[0043] Specifically, when the support surface 625 of the detected object 13 is located below the columnar space region, the two opposite, mutually parallel straight lines 751, 752 on the side surface of the cylinder 75 respectively have two vertical mapping lines 22, 23 on the support surface 625, and the two vertical mapping lines 22, 23 define the horizontal movement range of the implant device. In one embodiment, the vertical distance between the two vertical mapping lines 22, 23 depends on the height of the implant device 14 relative to the support surface 625, that is, depends on the vertical distance between the implant device 14 and the central axis 753 of the columnar space region 75. Figure 2 , Figure 7 This is described in detail.

[0044] For example, the vertical distance ( m 2 ) between the implant device and the central axis 753 of the columnar space region 75 can be determined based on the height information of the implant device in the body of the detected object. Figure 2 The height is shown by the dotted line in the middle), and based on the vertical distance, a straight line passing through the implant device and intersecting with the boundary of the cross section of the columnar space area 75 is virtualized as the virtual height line 754. The virtual height line 754 and the boundary of the cross section of the columnar space area 75 generate two intersection points 755, 756. Straight lines 751, 752 on the side surface of the columnar space area respectively passing through the two intersection points 755, 756 and parallel to the central axis 753 can limit the translation range of the implant device along the virtual height line. When it is vertically mapped and indicated on the support surface 625, it can be intuitively judged whether the implant device 14 exceeds the safe area according to the position of the detected object 13 on the support surface 625.

[0045] Therefore, if Figure 3 As shown, the safety prompt system for implant devices according to the second embodiment of the present invention may further include a module for determining the vertical mapping line, which may include an estimation module 26, a first determination module 27 and a second determination module 28 arranged in a computer in an operating room.

[0046] The estimation module 26 is used to estimate the vertical distance between the implant device and the central axis 753 of the columnar space region 75. For example, the vertical distance between the implant device and the central axis 753 of the columnar space region 75 can be estimated based on the weight of the subject input by the operator, the location of the implant device, etc.

[0047] The first determination module 27 is used to determine the virtual height line 754 of the implant device in the cross section of the columnar space area 75 according to the vertical distance, and to determine two intersection points 755 and 756 generated by the intersection of the two ends of the virtual height line 754 with the boundary of the cross section of the columnar space area.

[0048] The second determination module 28 determines the two vertical mapping lines based on the vertical mapping points of the two intersection points 755 and 756 on the support surface 625 of the detected object 13, for example, so that the two vertical mapping lines pass through the two vertical mapping points and are parallel to the central axis 753 of the columnar space area 75.

[0049] In this way, misjudgment due to differences in the body shape of the subjects being tested, differences in the position of the implanted device, etc. can be avoided, thereby ensuring the accuracy of the judgment.

[0050] In order to simplify the operation and calculation process, the two vertical mapping lines can also be pre-stored mapping lines corresponding to a specific combination of the body shape of the object being detected and the position of the implant device. In this way, there is no need to determine the vertical mapping lines in real time, but they can be directly selected according to actual conditions.

[0051] Embodiment 3

[0052] Figure 4 A schematic diagram of the structure of a safety prompt system for an implant device provided in a third embodiment of the present invention. Figure 5 A schematic block diagram of a safety prompt system for an implant device provided in accordance with a third embodiment of the present invention. Figure 4 , Figure 6 , Figure 7 As shown, the safety prompt system for the implant device of this embodiment includes an indication device, which indicates a predetermined safety boundary to indicate the positional relationship between the implant device of the detected object and the safety boundary, wherein the position range defined by the safety boundary is located in a columnar space area in the main magnetic field spatial gradient intensity distribution area of ​​the MR imaging system that allows the implant device to enter.

[0053] In this embodiment, the safety boundary includes vertical mapping lines of two opposite and parallel straight lines 751 and 752 on the side surface of the columnar space area 75 on the support surface 625 of the detected object, and the support surface 625 is the upper surface of the support bed where the detected object is located.

[0054] Combination Figure 4 , Figure 5 , Figure 7As shown, similar to the second embodiment, the safety prompt system for the implant device of the third embodiment of the present invention may further include a module for determining the vertical mapping line, which may include an estimation module 36, a first determination module 37 and a second determination module 38 arranged in a computer in the operating room.

[0055] The estimation module 36 is used to estimate the vertical distance between the implant device 14 and the central axis 753 of the columnar space region 75. For example, the vertical distance between the implant device 14 and the central axis 753 of the columnar space region 75 can be estimated based on the weight of the subject 13 input by the operator, the location of the implant device, etc.

[0056] The first determination module 37 is used to determine the virtual height line 754 of the implant device 14 within the cross-section of the columnar space area 75 according to the vertical distance, and to determine two intersection points 755 and 756 generated by the intersection of the two ends of the virtual height line 754 with the boundary of the cross-section of the columnar space area 75.

[0057] The second determination module 38 determines the two vertical mapping lines based on the vertical mapping points of the two intersection points 755 and 756 on the support surface 625 of the detected object 13, for example, so that the two vertical mapping lines pass through the two vertical mapping points and are parallel to the central axis 753 of the columnar space area 75.

[0058] The safety prompt system for implanted devices provided in the third embodiment of the present invention is similar in principle and implementation to that of the second embodiment, except that:

[0059] The above-mentioned indicating device comprises a display 31 installed in the scanning room 62 of the MR imaging system, for displaying the above-mentioned vertical mapping line ( Figure 4 The two vertical mapping lines displayed by the display 31 are marked as 33 and 34, and the image 32 of the detected object located in the main magnetic field spatial gradient intensity distribution area is displayed simultaneously. The display 31 can be installed on a scanning device.

[0060] Furthermore, if Figure 4 As shown, the image 32 of the detected object includes a virtual model image of the detected object, and the safety prompt system further includes a camera device 35 and an image processing module 39.

[0061] The camera device 35 is installed in the scanning room of the MR imaging system, for example, can be installed on the scanning equipment, and is used to capture the detected object located in the main magnetic field spatial gradient intensity distribution area to obtain an image 32 .

[0062] The image processing module 39 is used to generate a virtual model image of the detected object based on the feature information in the captured image 32, and send the generated virtual model image to the display 31 for display. By displaying the virtual model image of the detected object, interference information in the observation process can be shielded, making the observation more intuitive and conducive to quick judgment.

[0063] The feature information in the image 32 may include, for example, contour information. The image processing module 39 may be disposed in the computer system 661 in the operating room.

[0064] By displaying the vertical mapping line on a display that the operator can observe, and further displaying the image of the detected object located in the main magnetic field spatial gradient intensity distribution area, the operator can judge whether the implanted device in the detected object exceeds the range defined by the safety boundary by observing the relative position between the image of the detected object on the display and the safety boundary (vertical mapping lines 33, 34 displayed on the display 31). Of course, those skilled in the art should understand that the display should be based on the vertical mapping lines 34 and 35 and the actual position information of the detected object 13 on the support surface 625.

[0065] Based on the description of the above embodiments, the present invention further provides a safety prompt method for an implant device in an MR imaging system. Figure 8 A flowchart of a safety prompt method provided by an embodiment of the present invention is shown in FIG. Figure 8 As shown, the method comprises the following steps:

[0066] Step S81: Indicate a predetermined safety boundary to represent the positional relationship between the implant device of the detected object and the safety boundary, wherein the position range defined by the safety boundary is located within a columnar space region in the main magnetic field spatial gradient intensity distribution region of the MR imaging system that allows the implant device to enter.

[0067] Optionally, the spatial gradient intensity of the main magnetic field in the above-mentioned columnar spatial region is less than the maximum spatial change rate of magnetic induction intensity allowed by the implant device.

[0068] The safety boundary is preferably a side surface of the columnar space region, and indicating the predetermined safety boundary includes: projecting a columnar fog screen that coincides with the side surface of the columnar space region in the main magnetic field spatial gradient intensity distribution region.

[0069] Optionally, the safety boundary includes vertical mapping lines of two opposite and parallel straight lines on the side surface of the cylindrical space area on the supporting surface of the detected object.

[0070] Further, indicating the predetermined safety boundary includes: projecting two laser indication lines respectively overlapping with the two vertical mapping lines on a supporting surface of the detected object.

[0071] Optionally, indicating the predetermined safety boundary includes: displaying the two vertical mapping lines on a display, and simultaneously displaying an image of the detected object located in the main magnetic field spatial gradient intensity distribution region.

[0072] Optionally, the image of the detected object includes a virtual model image of the detected object, and the safety indication method also includes the following steps: capturing an image of the detected object located in the main magnetic field spatial gradient intensity distribution area; and generating a virtual model image of the detected object based on feature information in the captured image.

[0073] Optionally, before indicating the predetermined safety boundary, the step further includes:

[0074] estimating a vertical distance between the implant device and a central axis of the columnar space region;

[0075] Determine a virtual height line of the implant device in the cross section of the columnar space region according to the vertical distance, wherein two ends of the virtual height line intersect with the boundary of the cross section of the columnar space region to generate two intersection points;

[0076] The two vertical mapping lines are determined based on vertical mapping points of the two intersection points on the support surface of the detected object, respectively.

[0077] The principle, implementation mode, effect, etc. of the safety indication method for an implant device provided in the embodiment of the present invention have been described in detail in the embodiment of the safety indication system and will not be repeated here.

[0078] An embodiment of the present invention further provides a computer-readable storage medium for storing a computer program, which can be installed on a computer system of an MR imaging system and is used to cause the computer system to perform the following operations:

[0079] Generate a boundary indication instruction based on a predetermined safety boundary, the safety boundary indicating the positional relationship between the implant device of the detected object and the safety boundary, wherein the position range defined by the safety boundary is located in a columnar space region within the main magnetic field spatial gradient intensity distribution region of the MR imaging system, into which the implant device is allowed to enter; and

[0080] The boundary indication instruction is sent to the indication device to control the indication device to indicate the safety boundary.

[0081] The above-mentioned indicating device may include, for example, one or more of a projection device 11 , a laser projection device 21 and a display device 31 .

[0082] The indication device preferably includes a projection device installed in a scanning room of the MR imaging system, the safety boundary is the side surface of the columnar space area, and the boundary indication instruction is used to control the projection device to project a cylindrical fog screen that coincides with the side surface of the columnar space area in the main magnetic field spatial gradient intensity distribution area.

[0083] Optionally, the safety boundary includes vertical mapping lines of two opposite and parallel straight lines on the side surface of the cylindrical space area on the supporting surface of the detected object.

[0084] Furthermore, the indicating device includes a laser projection device installed in the scanning room of the MR imaging system, and the boundary indicating instruction is used to control the laser projection device to project two laser indicating lines respectively overlapping with the two vertical mapping lines on the supporting surface of the detected object.

[0085] Optionally, the indicating device includes a display installed in a scanning room of the MR imaging system, and the boundary indicating instruction is used to control the display to display the two vertical mapping lines and control the display to display an image of the detected object located in the main magnetic field spatial gradient intensity distribution area.

[0086] Optionally, the image of the detected object includes an image of a virtual model of the detected object, and the computer program is further configured to cause the computer system to perform the following operations:

[0087] Acquire an image of the detected object located in the main magnetic field spatial gradient intensity distribution area; and,

[0088] A virtual model image of the detected object is generated based on feature information in the captured image.

[0089] Optionally, the computer program further comprises the following instructions:

[0090] estimating the vertical distance between the implant device and the central axis of the columnar space region;

[0091] Determine a virtual height line of the implant device in the cross section of the columnar space region according to the vertical distance, and determine two intersection points where two ends of the virtual height line intersect with the boundary of the cross section of the columnar space region; and,

[0092] The two vertical mapping lines are determined based on vertical mapping points of the two intersection points on the support surface of the detected object, respectively.

[0093] In an embodiment of the present invention, the safe area of ​​the implant device can be determined based on the distribution of the spatial gradient intensity of the main magnetic field, and the safe area can be limited by indicating a safe boundary. The operator can intuitively judge whether the implant device of the object being detected is within the safe area based on the indicated safety boundary, so that adjustments can be made in time based on intuitive observation results to avoid safety accidents.

[0094] Some exemplary embodiments have been described above, however, it should be understood that various modifications may be made. For example, if the described techniques are performed in a different order and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents, suitable results may be achieved. Accordingly, other implementations also fall within the scope of protection of the claims.

Claims

1. A safety prompt method for an implanted device in an MR imaging system, comprising: The predetermined safety boundary is indicated by an indicating device to intuitively indicate the positional relationship between the implant device of the detected object and the safety boundary, wherein the position range defined by the safety boundary is located in a columnar space region within the main magnetic field spatial gradient intensity distribution region of the MR imaging system, within which the implant device is allowed to enter. wherein the indicating device comprises one or more of a projection device, a laser projection device and a display installed in a scanning room of the MR imaging system, wherein the display is used to display an image of the detected object located in the main magnetic field spatial gradient intensity distribution area, The safety boundary is the side surface of the columnar space region, and indicating the predetermined safety boundary includes: projecting a columnar fog screen that coincides with the side surface of the columnar space region in the main magnetic field spatial gradient intensity distribution region; or The safety boundary includes vertical mapping lines of two opposite and parallel straight lines on the side surface of the columnar space area on the supporting surface of the detected object.

2. The method according to claim 1, characterized in that Indicating the predetermined safety boundary includes: projecting two laser indication lines respectively overlapping the two vertical mapping lines on the supporting surface of the detected object.

3. The method according to claim 1, characterized in that Indicating the predetermined security boundary includes: The two vertical mapping lines are displayed on the display, and an image of the detected object located in the main magnetic field spatial gradient intensity distribution area is displayed.

4. The method according to claim 3, characterized in that The image of the detected object includes a virtual model image of the detected object, and the method further includes: capturing an image of the detected object located in the main magnetic field spatial gradient intensity distribution region; and, A virtual model image of the detected object is generated based on feature information in the captured image.

5. The method according to any one of claims 1 to 4, characterized in that: The method further includes: estimating a vertical distance between the implant device and a central axis of the columnar spatial region; Determine a virtual height line of the implant device in the cross section of the columnar space region according to the vertical distance, wherein two ends of the virtual height line intersect with the boundary of the cross section of the columnar space region to generate two intersection points; The two vertical mapping lines are determined based on vertical mapping points of the two intersection points on the support surface of the detected object, respectively.

6. The method according to claim 1, characterized in that The spatial gradient intensity of the main magnetic field in the columnar space region is less than the maximum spatial variation rate of magnetic induction intensity allowed by the implant device.

7. A safety prompt system for an implanted device in an MR imaging system, comprising: An indicating device intuitively indicates the positional relationship between the implanted device of the detected object and the safety boundary by indicating a predetermined safety boundary, wherein the position range defined by the safety boundary is located in a columnar space region within the main magnetic field spatial gradient intensity distribution region of the MR imaging system within which the implanted device is allowed to enter. The indicating device comprises one or more of a projection device, a laser projection device and a display installed in a scanning room of the MR imaging system, wherein the display is used to display an image of the detected object located in the main magnetic field spatial gradient intensity distribution area, Wherein, the safety boundary is the side surface of the columnar space region, and the projection device is used to project a columnar fog screen that coincides with the side surface of the columnar space region in the main magnetic field spatial gradient intensity distribution region; or The safety boundary includes vertical mapping lines of two opposite and parallel straight lines on the side surface of the columnar space area on the supporting surface of the detected object.

8. The safety prompt system according to claim 7, characterized in that: The laser projection device is used to project two laser indication lines respectively overlapping with the two vertical mapping lines onto the supporting surface of the detected object.

9. The safety prompt system according to claim 7, characterized in that: The display is used to display the two vertical mapping lines.

10. The safety prompt system according to claim 9, characterized in that: The image of the detected object includes a virtual model image of the detected object, and the safety prompt system further includes: An imaging device installed in a scanning room of the MR imaging system, used for capturing an image of the detected object located in a region of spatial gradient intensity distribution of the main magnetic field; and The image processing module is used to generate a virtual model image of the detected object based on feature information in the captured image, and send the generated virtual model image to the display for display.

11. The safety prompt system according to any one of claims 7 to 10, characterized in that: The safety prompt system also includes: An estimation module: used for estimating the vertical distance between the implant device and the central axis of the columnar space area; A first determination module is used to determine a virtual height line of the implant device in the cross section of the columnar space region according to the vertical distance, and to determine two intersection points generated by the intersection of two ends of the virtual height line with the boundary of the cross section of the columnar space region; The second determination module determines the two vertical mapping lines based on vertical mapping points of the two intersection points on the support surface of the detected object.

12. The safety prompt system according to claim 7, characterized in that: The spatial gradient intensity of the main magnetic field in the columnar space region is less than the maximum spatial variation rate of magnetic induction intensity allowed by the implant device.

13. A computer readable storage medium for storing a computer program, wherein the computer program is installed on a computer system of an MR imaging system and is used to execute the following instructions: A boundary indication instruction is generated based on a predetermined safety boundary, wherein the safety boundary intuitively represents the positional relationship between the implant device of the detected object and the safety boundary, wherein: The position range defined by the safety boundary is located in a columnar space region within the main magnetic field spatial gradient intensity distribution region of the MR imaging system, within which the implant device is allowed to enter; The boundary indication instruction is sent to an indication device to control the indication device to indicate the safety boundary, wherein the indication device includes one or more of a projection device, a laser projection device and a display installed in a scanning room of the MR imaging system, wherein the boundary indication instruction is used to control the display to display an image of the detected object located in the main magnetic field spatial gradient intensity distribution area, wherein the safety boundary is a side surface of the columnar space region, and the boundary indication instruction is used to control the projection device to project a columnar fog screen that coincides with the side surface of the columnar space region in the main magnetic field spatial gradient intensity distribution region; or The safety boundary includes vertical mapping lines of two opposite and parallel straight lines on the side surface of the columnar space area on the supporting surface of the detected object.

14. The computer-readable storage medium according to claim 13, wherein: The boundary indication instruction is used to control the laser projection device to project two laser indication lines respectively overlapping with the two vertical mapping lines on the supporting surface of the detected object.

15. The computer-readable storage medium according to claim 13, wherein: The boundary indication instruction is used to control the display to display the two vertical mapping lines.

16. The computer-readable storage medium according to claim 15, wherein: The image of the detected object includes a virtual model image of the detected object, and the computer program further includes the following instructions: Acquire a captured image of the detected object located in the main magnetic field spatial gradient intensity distribution region; and, A virtual model image of the detected object is generated based on feature information in the captured image.

17. The computer-readable storage medium according to any one of claims 13 to 16, characterized in that: The computer readable storage medium also includes the following instructions: estimating a vertical distance between the implant device and a central axis of the columnar spatial region; Determine a virtual height line of the implant device in the cross section of the columnar space region according to the vertical distance, and determine two intersection points generated by the intersection of two ends of the virtual height line with the boundary of the cross section of the columnar space region; The two vertical mapping lines are determined based on vertical mapping points of the two intersection points on the support surface of the detected object, respectively.

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