A CT dynamic balance correction method and system

Abstract

The present application belongs to the technical field of CT scanners. A CT dynamic balance correction method includes determining the size and position of counterweights to be added / subtracted corresponding to planes I and II based on the initial position of the initial counterweight on the track when the CT scanner body is initially statically balanced, wherein planes I and II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; decomposing the size and position of the counterweights to be added / subtracted on planes I and II, respectively, to obtain decomposition results; obtaining the weight and Z-axis coordinate of a target counterweight to be added on the track based on the decomposition results, wherein the track represents the weight of the target counterweight sliding between planes I and II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on plane I and plane II; and adjusting the track based on the Z-axis coordinates of the target counterweights to obtain target positions of a plurality of target counterweights.

Description

Technical Field

[0001] The present application belongs to the technical field of CT scanners, and in particular relates to a CT dynamic balance correction method and system. Background Art

[0002] CT scanners play a vital role in medical diagnosis, with their stability and precision directly determining imaging quality and diagnostic accuracy. Due to imperfections in the manufacturing and assembly processes, core components of CT scanners, including the X-ray tube and detector system, can become unbalanced during high-speed operation. This can cause vibration, noise, and image distortion, impacting diagnostic results. Therefore, dynamic balancing is crucial to ensuring proper operation and image quality of CT scanners.

[0003] The traditional dynamic balancing correction method mainly eliminates the imbalance by adding or removing weight from the machine, but this method has many inconveniences. The operation process is cumbersome, time-consuming and labor-intensive, and requires the transportation and operation of large counterweights, which places high demands on both the operator and the operation location. In addition, this method is inefficient and difficult to adapt to the fast-paced medical environment. Therefore, improving the CT dynamic balancing correction method to make it simpler and more efficient has become an important issue for improving the performance of medical equipment. There is an urgent need for a new correction method that can reduce the difficulty and complexity of operation and improve the dynamic balancing efficiency of production and after-sales to meet the requirements of modern medical equipment for high efficiency and high precision. Summary of the Invention

[0004] Based on this, it is necessary to provide a CT dynamic balance correction method and system to address the above technical issues.

[0005] In a first aspect, the present application provides a CT dynamic balance correction method, the method comprising:

[0006] When the CT scanner body is initially statically balanced, the size and position of the counterweight to be added / subtracted corresponding to plane I and plane II are determined based on the initial position of the initial counterweight on the track, wherein plane I and plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system;

[0007] Decomposing the size and position of the counterweight to be added / subtracted onto the plane I and the plane II, respectively, to obtain decomposition results;

[0008] According to the decomposition result, the weight and Z-axis coordinate of the target counterweight to be added to the track are obtained, wherein the track represents the weight of the target counterweight sliding between plane I and plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on plane I and the counterweight to be added / subtracted on plane II;

[0009] According to the Z-axis coordinate of the target counterweight, adjustments are made on the track to obtain target positions of several target counterweights.

[0010] In some practicable embodiments, when the CT scanner body is initially statically balanced, the step of determining the size and position of the counterweight to be added / subtracted corresponding to plane I and plane II based on the initial position of the initial counterweight on the track includes:

[0011] When it is known that the initial counterweight is located at the initial position of the track, a preliminary static balance is performed on the CT scanner body to obtain the weight of the initial counterweight; wherein the track is parallel and symmetrically distributed on the left and right sides of the rotor of the CT scanner body. If there are two initial counterweights, the weight calculation formula of the two initial counterweights is:

[0012] ;

[0013] in, For components weight, For components Position vector; is the weight of the initial counterweight on the left side of the rotor, is the weight of the initial counterweight on the right side of the rotor, Components Position vector, is the maximum weight that can be added.

[0014] In some practicable embodiments, the step of decomposing the size and position of the counterweight to be added / subtracted onto the plane I and the plane II, respectively, to obtain the decomposition results includes:

[0015] obtaining an initial vibration value of the CT scanner body;

[0016] Obtaining a vibration value I of the plane I after adding a test weight I;

[0017] Obtaining a vibration value II after adding a test weight II to the plane II;

[0018] determining a system influence coefficient according to the initial vibration value, the vibration value I, and the vibration value II;

[0019] According to the system influence coefficient, the decomposition results of the size and position of the counterweight to be added / reduced on the plane I and the plane II are obtained.

[0020] In some practicable embodiments, the step of adjusting on the track according to the Z-axis coordinate of the target counterweight to obtain target positions of the target counterweights includes:

[0021] If the number of the target weights between the plane I and the plane II is two:

[0022] The calculation formulas for the counterweight of plane I and the counterweight of plane II are:

[0023] ;

[0024] ;

[0025] The distance of the target weight on the plane I side and the distance on the plane II side are:

[0026] ;

[0027] ;

[0028] in, Indicates the target weight on the right side, represents the weight of the right target counterweight on plane I, Indicates the weight of the right target counterweight in plane II, Indicates the left target weight, represents the weight of the left target counterweight on plane I, Indicates the weight of the left target counterweight on plane II, represents the Z-axis coordinate of the plane I, represents the Z-axis coordinate of the plane II;

[0029] Calculation is performed based on the Z-axis coordinates of the plane I and the Z-axis coordinates of the plane II to obtain target positions of several target counterweights.

[0030] In a second aspect, the present application provides a CT dynamic balance correction system, characterized in that it is applied to the aforementioned CT dynamic balance correction method, and the system includes:

[0031] A CT scanner body having a plane I and a plane II, wherein the plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system;

[0032] A plurality of tracks are provided between the plane I and the plane II, wherein the tracks are parallel to the Z axis, and the two ends of the tracks are respectively connected to the plane I and the plane II;

[0033] An initial counterweight and a positioning mechanism are provided within the track, wherein the positioning mechanism is capable of adjusting the position of the initial counterweight within the track; wherein the initial counterweight is located at an initial position within the track, and the weight of the initial counterweight is such that the CT scanner body can be in a preliminary static balance; when the amount of counterweight to be added / subtracted in plane I and plane II is known, the weight of the initial counterweight is adjusted to form a target counterweight weight;

[0034] A control system is connected to the positioning mechanism, wherein the control system is configured to:

[0035] When the CT scanner body is initially statically balanced, the size and position of the counterweight to be added / subtracted corresponding to plane I and plane II are determined according to the initial position of the initial counterweight on the track, wherein plane I and plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system;

[0036] Decomposing the size and position of the counterweight to be added / subtracted onto the plane I and the plane II, respectively, to obtain decomposition results;

[0037] According to the decomposition result, the weight and Z-axis coordinate of the target counterweight to be added to the track are obtained, wherein the track represents the weight of the target counterweight sliding between plane I and plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on plane I and the counterweight to be added / subtracted on plane II;

[0038] According to the Z-axis coordinate of the target counterweight, adjustments are made on the track to obtain target positions of several target counterweights.

[0039] In some implementations, the centers of the plurality of tracks are the initial positions; the plurality of tracks are parallel and symmetrically distributed on the left and right sides of the rotor of the CT scanner body;

[0040] The control system is further configured to:

[0041] When it is known that the initial counterweight is located at the initial position of the track, a preliminary static balance is performed on the CT scanner body to obtain the weight of the initial counterweight. If there are two initial counterweights, the weight calculation formula of the two initial counterweights is:

[0042] ;

[0043] in, For components weight, For components Position vector; is the weight of the initial counterweight on the left side of the rotor, is the weight of the initial counterweight on the right side of the rotor, Components Position vector, is the maximum weight that can be added.

[0044] In some implementations, the control system is further configured to:

[0045] obtaining an initial vibration value of the CT scanner body;

[0046] Obtaining a vibration value I of the plane I after adding a test weight I;

[0047] Obtaining a vibration value II after adding a test weight II to the plane II;

[0048] determining a system influence coefficient according to the initial vibration value, the vibration value I, and the vibration value II;

[0049] According to the system influence coefficient, the decomposition results of the size and position of the counterweight to be added / reduced on the plane I and the plane II are obtained.

[0050] In some implementations, the control system is further configured to:

[0051] If the number of the target weights between the plane I and the plane II is two:

[0052] The calculation formulas for the counterweight of plane I and the counterweight of plane II are:

[0053] ;

[0054] ;

[0055] The distance of the target weight on the plane I side and the distance on the plane II side are:

[0056] ;

[0057] ;

[0058] in, Indicates the target weight on the right side, represents the weight of the right target counterweight on plane I, Indicates the weight of the right target counterweight in plane II, Indicates the left target weight, represents the weight of the left target counterweight on plane I, Indicates the weight of the left target counterweight on plane II, represents the Z-axis coordinate of the plane I, represents the Z-axis coordinate of the plane II;

[0059] Calculation is performed based on the Z-axis coordinates of the plane I and the Z-axis coordinates of the plane II to obtain target positions of several target counterweights.

[0060] Beneficial effect: The present application provides a CT dynamic balance correction system, comprising a CT scanner body, having a plane I and a plane II, wherein the plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; a plurality of tracks are arranged between the plane I and the plane II, the tracks are parallel to the Z axis tracks, and their two ends are respectively connected from plane I to plane II; an initial counterweight and a positioning mechanism are arranged in the track, and the positioning mechanism can adjust the position of the initial counterweight in the track; wherein the initial counterweight is located in an initial position in the track, and the weight of the initial counterweight is the weight that the CT scanner body can be in a preliminary static balance state; when the amount of counterweight to be added / subtracted in plane I and plane II is known, the weight of the initial counterweight is adjusted to form a target counterweight weight; a control system is connected to the positioning mechanism, wherein the control system is applied to the CT dynamic balance correction method and is configured as follows: a control system is connected to the positioning mechanism, and In the embodiment, the control system is configured to: when the CT scanner body is initially statically balanced, determine the size and position of the counterweight to be added / subtracted corresponding to Plane I and Plane II based on the initial position of the initial counterweight on the track, wherein Plane I and Plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; decompose the size and position of the counterweight to be added / subtracted on Plane I and Plane II, respectively, to obtain decomposition results; obtain the weight and Z-axis coordinate of the target counterweight to be added on the track based on the decomposition results, wherein the track represents the weight of the target counterweight sliding between Plane I and Plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on Plane I and Plane II; and adjust the target counterweight on the track based on the Z-axis coordinates of the target counterweight to obtain the target positions of the target counterweights. The above method can be used to calculate the weight to be added or subtracted at the adjustable counterweight position, as well as the position of the center of gravity. Finally, the counterweight is driven by the positioning mechanism to move the counterweight to the target position and lock it. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0062] Figure 1 is a flow chart of a CT dynamic balance correction method in one embodiment;

[0063] Figure 2 A schematic diagram of a plane of a CT dynamic balance correction system in a coordinate system according to an embodiment;

[0064] Figure 3 A schematic diagram of adding / removing counterweight during dynamic balancing of a CT dynamic balancing correction system according to one embodiment;

[0065] Figure 4 A schematic diagram of a Z-axis coordinate adjustment counterweight for a CT dynamic balance correction system according to one embodiment;

[0066] Figure 5 Schematic diagram of the structure of a CT dynamic balance correction system in one embodiment;

[0067] Figure 6 The figure is a schematic diagram of the overall process of a CT dynamic balance correction system in one embodiment. DETAILED DESCRIPTION

[0068] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all couplings of one or more of the associated listed items.

[0070] It will be understood that the terms "first," "second," etc. used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element.

[0071] The following are some explanations of some terms involved in this application to facilitate understanding of this application:

[0072] Unbalance, a term used in rotating machinery, refers to the uneven distribution of mass within rotating components (such as rotors, shafts, and turbines), resulting in a misalignment of their center of mass (or center of gravity) with the axis of rotation. This uneven mass distribution generates centrifugal forces during rotation, causing vibration.

[0073] like Figures 1 to 6 As shown, in a first aspect, the present application provides a CT dynamic balance correction method, the method comprising:

[0074] S100 , when the CT scanner body is initially statically balanced, the size and position of the counterweight to be added / subtracted corresponding to plane I and plane II are determined according to the initial position of the initial counterweight on the track.

[0075] The plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system.

[0076] Exemplarily, plane I and plane II may be two opposite end surfaces of the CT scanner body.

[0077] Step S100 may include the following steps:

[0078] When it is known that the initial counterweight is located at the initial position of the track, a preliminary static balance is performed on the CT scanner body to obtain the weight of the initial counterweight; wherein the track is parallel and symmetrically distributed on the left and right sides of the rotor of the CT scanner body. If there are two initial counterweights, the weight calculation formula of the two initial counterweights is:

[0079] ;

[0080] in, For components weight, For components Position vector; is the weight of the initial counterweight on the left side of the rotor, is the weight of the initial counterweight on the right side of the rotor, Components Position vector, is the maximum weight that can be added.

[0081] It should be noted that since the CT scanner itself is a precision instrument, adding counterweights directly and then performing dynamic balancing vibration measurements may damage the CT scanner due to improper weight addition. Therefore, before performing a dynamic balancing test, a static balancing test should be performed to ensure that the quality of the added counterweights will not cause vibration damage to the CT scanner.

[0082] This application uses two initial counterweights for illustrative purposes, and the specific number can be adjusted as needed, for example, the number of initial counterweights can be 2, 3, 4, 5, 6, 7, 8, etc. The weight calculation formula of the two initial counterweights ensures that the torque of the CT scanner body is balanced in the initial static balance state, thereby avoiding equipment damage caused by unbalanced torque. In this way, dynamic balance testing can be achieved without damaging the CT scanner body. This method of performing a static balance test first is based on considerations for the precision of the CT scanner body to ensure that the counterweights added during the dynamic balance test will not cause damage to the equipment.

[0083] S200 , decomposing the size and position of the counterweight to be added / reduced onto the plane I and the plane II, respectively, to obtain decomposition results.

[0084] Specifically, obtaining the decomposition result may include the following steps:

[0085] S201: Acquire an initial vibration value of the CT scanner body.

[0086] S202, obtaining the vibration value I of the plane I after adding the test weight I.

[0087] S203, obtaining the vibration value II after adding the test weight II to the plane II.

[0088] S204 : Determine the system influence coefficients of the plane I and the plane II according to the initial vibration value, the vibration value I, and the vibration value II.

[0089] S205 , obtaining a decomposition result of the size and position of the counterweight to be added / reduced on the plane I and the plane II according to the system influence coefficient.

[0090] For example, the size and position of the counterweight to be added / subtracted on the plane I and the plane II are obtained, and the calculation formula for the counterweight to be added / subtracted is:

[0091] Using the sensors inside the CT scanner body, the initial vibration values of measuring points 1 and 2 are collected. .

[0092] Add test weight and measure the vibration value after adding test weight , try again .

[0093] Plane II adds test weight and measures vibration value after adding test weight , try again .

[0094] Calculate the influence coefficient, and add the system influence coefficient of plane I to test points 1 and 2:

[0095]

[0096] Calculate the influence coefficient, and test the system influence coefficient of measuring points 1 and 2 on plane II:

[0097]

[0098] Calculate the weight of the counterweight. , The weight to be added / subtracted for plane I and plane II is as follows: , and the system influence coefficient, determine the decomposition result of the size and position of the counterweight to be added / subtracted.

[0099] It should be noted that the influence coefficient Represents the effect of adding test weight on plane I and plane II on the vibration values of measuring points 1 and 2 respectively. These influence coefficients describe the contribution of adding weight on a specific plane to the vibration response.

[0100] Obtained by solving the linear equations , Indicates the size and position of the counterweight that needs to be added / subtracted on Plane I and Plane II.

[0101] Next, the decomposed results of the size and position of the counterweight to be added / subtracted are compared with the initial counterweight and adjusted to obtain the target counterweight. For example, the initial counterweight refers to the weight of the counterweight already on the CT scanner body before any adjustment is made. ) is calculated based on the vibration value and the influence coefficient, indicating the amount of counterweight that needs to be added or reduced on plane I and plane II to achieve dynamic balance. For plane I, if If it is a positive value, it means that the counterweight needs to be increased; if it is a negative value, it means that the counterweight needs to be reduced. Similarly, for plane II, Positive and negative values also indicate the need to add or subtract counterweight. The required counterweight adjustment for each plane is calculated as the difference between the required counterweight and the initial counterweight. Based on the calculated counterweight adjustment, the initial counterweight on the CT scanner body is actually increased or decreased.

[0102] S300: Obtain the weight and Z-axis coordinate of the target counterweight to be added to the track according to the decomposition result.

[0103] The track represents the weight of the target counterweight sliding track between plane I and plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on plane I and the counterweight to be added / subtracted on plane II.

[0104] Specifically, step S300 may include the following steps:

[0105] S301: If the number of the target counterweights between the plane I and the plane II is two:

[0106] The calculation formulas for the counterweight of plane I and the counterweight of plane II are:

[0107] ;

[0108] ;

[0109] The distance of the target weight on the plane I side and the distance on the plane II side are:

[0110] ;

[0111] ;

[0112] in, Indicates the target weight on the right side, represents the weight of the right target counterweight on plane I, Indicates the weight of the right target counterweight in plane II, Indicates the left target weight, represents the weight of the left target counterweight on plane I, Indicates the weight of the left target counterweight on plane II, represents the Z-axis coordinate of the plane I, Represents the Z-axis coordinate of the plane II.

[0113] It is understandable that the target amount of counterweights can be adjusted as needed.

[0114] S302 , performing calculations based on the Z-axis coordinates of the plane I and the Z-axis coordinates of the plane II to obtain target positions of a plurality of target counterweights.

[0115] Through this process, the target counterweight is accurately placed between Plane I and Plane II to achieve dynamic balancing of the CT scanner. This method improves the stability of the device and ensures imaging quality and diagnostic accuracy.

[0116] S400 , adjusting on the track according to the Z-axis coordinate of the target counterweight to obtain target positions of several target counterweights.

[0117] Specifically, in the aforementioned steps, the Z-axis coordinate of the target counterweight in the track is obtained. Thus, the target counterweight is adjusted accordingly on the track so that the target counterweight is located at the coordinate on the Z-axis to achieve CT dynamic balance correction.

[0118] like Figures 2 to 6 In a second aspect, the present application provides a CT dynamic balance correction system, which is applied to the aforementioned CT dynamic balance correction method, and the system includes:

[0119] A CT scanner body having a plane I and a plane II, wherein the plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system;

[0120] A plurality of tracks are provided between the plane I and the plane II, wherein the tracks are parallel to the Z axis, and the two ends of the tracks are respectively connected to the plane I and the plane II;

[0121] An initial counterweight and a positioning mechanism are provided within the track, wherein the positioning mechanism is capable of adjusting the position of the initial counterweight within the track; wherein the initial counterweight is located at an initial position within the track, and the weight of the initial counterweight is such that the CT scanner body can be in a preliminary static balance; when the amount of counterweight to be added / subtracted in plane I and plane II is known, the weight of the initial counterweight is adjusted to form a target counterweight weight;

[0122] A control system is connected to the positioning mechanism, wherein the control system is configured to:

[0123] When the CT scanner body is initially statically balanced, the size and position of the counterweight to be added / subtracted corresponding to plane I and plane II are determined according to the initial position of the initial counterweight on the track, wherein plane I and plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system;

[0124] Decomposing the size and position of the counterweight to be added / subtracted onto the plane I and the plane II, respectively, to obtain decomposition results;

[0125] According to the decomposition result, the weight and Z-axis coordinate of the target counterweight to be added to the track are obtained, wherein the track represents the weight of the target counterweight sliding between plane I and plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on plane I and the counterweight to be added / subtracted on plane II;

[0126] According to the Z-axis coordinate of the target counterweight, adjustments are made on the track to obtain target positions of several target counterweights.

[0127] It should be noted that for the configuration of the control system, reference can be made to the aforementioned CT dynamic balance correction method, which will not be elaborated here. However, it should be clarified that the adjustment of the initial counterweight to the target counterweight can be performed through manual participation. For example, when the target counterweight is different from the initial counterweight, the control system can display the weight value of the target counterweight, for example, through a display, displaying the weight (also called mass) of the target counterweight. In this way, the staff can replace the initial counterweight according to the target weight value displayed on the display.

[0128] It should also be noted that the positioning mechanism may include a motor and a lead screw, and the track may be understood as a guide rail.

[0129] A counterweight is set on the screw, and the motor drives the screw to rotate, and the screw transmits the counterweight to the target position, thereby achieving dynamic balance of the CT scanner body; in addition, the control system can be a computer.

[0130] In one embodiment, the centers of the plurality of tracks are the initial positions; the plurality of tracks are parallel and symmetrically distributed on the left and right sides of the rotor of the CT scanner body;

[0131] The control system is further configured to:

[0132] When it is known that the initial counterweight is located at the initial position of the track, a preliminary static balance is performed on the CT scanner body to obtain the weight of the initial counterweight. If there are two initial counterweights, the weight calculation formula of the two initial counterweights is:

[0133] ;

[0134] in, For components weight, For components Position vector; is the weight of the initial counterweight on the left side of the rotor, is the weight of the initial counterweight on the right side of the rotor, Components Position vector, is the maximum weight that can be added.

[0135] It should be noted that the center of the track is the initial position, and the center of gravity of the initial counterweight or target counterweight is located at the center of the track. For the configuration of the control system, reference can be made to the aforementioned CT dynamic balance correction method, which will not be repeated here.

[0136] In one embodiment, the control system is further configured to:

[0137] obtaining an initial vibration value of the CT scanner body;

[0138] Obtaining a vibration value I of the plane I after adding a test weight I;

[0139] Obtaining a vibration value II after adding a test weight II to the plane II;

[0140] determining a system influence coefficient according to the initial vibration value, the vibration value I, and the vibration value II;

[0141] According to the system influence coefficient, the decomposition results of the size and position of the counterweight to be added / reduced on the plane I and the plane II are obtained.

[0142] It should be noted that the configuration of the control system can refer to the aforementioned CT dynamic balance correction method and will not be described in detail here. As mentioned above, for adjusting the initial counterweight to the target counterweight, the control system can generate a signal carrying the target counterweight weight, and use relevant conversion equipment to display this information on the display screen so that the staff can change the initial counterweight to the target counterweight.

[0143] In one embodiment, the control system is further configured to:

[0144] If the number of the target weights between the plane I and the plane II is two:

[0145] The calculation formulas for the counterweight of plane I and the counterweight of plane II are:

[0146] ;

[0147] ;

[0148] The distance of the target weight on the plane I side and the distance on the plane II side are:

[0149] ;

[0150] ;

[0151] in, Indicates the target weight on the right side, represents the weight of the right target counterweight on plane I, Indicates the weight of the right target counterweight in plane II, Indicates the left target weight, represents the weight of the left target counterweight on plane I, Indicates the weight of the left target counterweight on plane II, represents the Z-axis coordinate of plane I, Indicates the Z-axis coordinate of plane II;

[0152] Calculation is performed based on the Z-axis coordinates of the plane I and the Z-axis coordinates of the plane II to obtain target positions of several target counterweights.

[0153] It should be noted that, for the configuration of the control system, reference may be made to the aforementioned CT dynamic balance correction method, which will not be elaborated here. Example

[0154] This application proposes a CT dynamic balance correction system, which may include the following process during CT dynamic balance correction:

[0155] Static balance:

[0156] There are two places on the CT scanner body where you can add or remove weights. Figure 2 , which are symmetrically distributed parallel to the left and right sides of the rotor and fixed between Planes I and II. Before actual dynamic balancing, a preliminary static balance is required to prevent the CT scanner body from vibrating and damaging during rotation due to excessive initial imbalance, which can cause dangerous accidents. Given the detailed mass and center of mass information of each system component (components refer to the original components of the CT scanner body), the mass of the counterweight required to achieve preliminary static balance can be calculated:

[0157] ;

[0158] Where, is the mass of component i, is its position vector;

[0159] is the mass of the left counterweight, is the mass of the right counterweight, are their position vectors, is the maximum mass that can be added.

[0160] Dynamic balance

[0161] After completing the initial static balance, dynamic balance is performed according to the principle of the dual-plane influence coefficient method. The CT scanner body is started and operated at the working speed. The internal sensor of the CT scanner body collects the vibration value. Subsequently, two test weights are added and measured. Finally, the weight to be added / reduced on the two planes is obtained through computer signal processing and calculation. (two-dimensional vector, including size and phase information). Since the position where the weight can be added to the CT scanner body is fixed, it is necessary to further decompose the weight that should be added or reduced at each of the two points, such as Figure 3As shown. After the decomposition is completed, we can get (The superscript represents the plane, and the subscript represents the position of the counterweight), and the added / reduced counterweight on the left and right sides can be expressed as:

[0162]

[0163] It is established on the X, Y plane, but it still needs to be determined The z-axis coordinate of Figure 4 As shown:

[0164]

[0165] Calculated After that, the computer transmits the command to the motor, and the automatic balance is achieved through the screw guide rail. Figure 5 shown.

[0166] The overall process of a CT dynamic balance correction system is as follows: Figure 6 shown. Figure 6 In the process, the component mass and center of mass information are first input into the system, the mass of the counterweight to be added is calculated, and then the counterweight is added to complete the preliminary static balance, and vibration measurement is performed. According to the vibration measurement results, signal processing and dual-plane influence coefficient method are performed to obtain the weight to be added / subtracted on the two planes, and the corresponding addition / subtraction of the counterweight is decomposed and calculated. After obtaining the decomposition calculation results, the left and right side counterweight masses and z-axis position adjustment instructions are formed according to the calculation results. The computer sends instructions to the motor to move the counterweight. Finally, the running results of the dynamic balance correction are detected. If the vibration amount is less than the allowable value, the dynamic balance correction is completed. Otherwise, signal processing and dual-plane influence coefficient method calculation are performed.

[0167] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0168] The various embodiments in the present disclosure are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0169] The scope of protection of the present disclosure is not limited to the above-described embodiments. Obviously, those skilled in the art may make various modifications and variations to the present disclosure without departing from the scope and spirit of the present disclosure. If such modifications and variations fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such modifications and variations.

Claims

1. A CT dynamic balance correction method, characterized in that the method include: When the CT scanner body is initially statically balanced, the size and position of the counterweight to be added / subtracted corresponding to plane I and plane II are determined based on the initial position of the initial counterweight on the track, wherein plane I and plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; After completing the initial static balance, dynamic balancing is performed according to the principle of the dual-plane influence coefficient method. The CT scanner body is started and operated at the working speed. The internal sensor of the CT scanner body collects the vibration value. Subsequently, two trial weights are added and measured. Finally, the weight to be added / reduced on the two planes is obtained through computer signal processing and calculation. and , and Two-dimensional vector, containing magnitude and phase information, and Decompose to get the weight that should be added or reduced at each of the two points. After decomposition is completed, we get , represents the weight of the right target counterweight on plane I, Indicates the weight of the right target counterweight in plane II, represents the weight of the left target counterweight on plane I, Indicates the weight of the left target counterweight in plane II; According to the decomposition result, the weight and Z-axis coordinate of the target counterweight to be added to the track are obtained, wherein the track represents the weight of the target counterweight sliding track between the plane I and the plane II; According to the Z-axis coordinate of the target counterweight, adjustments are made on the track to obtain target positions of several target counterweights.

2. The CT dynamic balance correction method according to claim 1, characterized in that: The step of determining the size and position of the counterweight to be added / subtracted corresponding to plane I and plane II according to the initial position of the initial counterweight on the track when the CT scanner body is initially statically balanced comprises: When it is known that the initial counterweight is located at the initial position of the track, a preliminary static balance is performed on the CT scanner body to obtain the weight of the initial counterweight; wherein the track is parallel and symmetrically distributed on the left and right sides of the rotor of the CT scanner body. If there are two initial counterweights, the weight calculation formula of the two initial counterweights is: ； in, For components weight, For components Position vector; is the weight of the initial counterweight on the left side of the rotor, is the weight of the initial counterweight on the right side of the rotor, and The vectors are the position vectors of the initial weight, is the maximum weight that can be added.

3. The CT dynamic balance correction method according to claim 2, characterized in that: The steps of performing dynamic balancing according to the principle of the dual-plane influence coefficient method include: obtaining an initial vibration value of the CT scanner body; Obtaining a vibration value I of the plane I after adding a test weight I; Obtaining a vibration value II after adding a test weight II to the plane II; Determining a system influence coefficient according to the initial vibration value, the vibration value I, and the vibration value II; According to the system influence coefficient, the weights to be added or subtracted on plane I and plane II in the dynamic balancing stage are obtained. and ,in and is a two-dimensional vector, including magnitude and phase information.

4. The CT dynamic balance correction method according to claim 1, characterized in that: The step of adjusting on the track according to the Z-axis coordinate of the target counterweight to obtain the target positions of the target counterweights includes: If the number of the target weights between the plane I and the plane II is two: On the left and right sides, the added or subtracted weight is expressed as: ； ； The distance of the target weight on the plane I side and the distance on the plane II side are: ； ； in, Indicates the target weight on the right side, Indicates the left target weight, represents the Z-axis coordinate of the plane I, represents the Z-axis coordinate of the plane II; Calculation is performed based on the Z-axis coordinates of the plane I and the Z-axis coordinates of the plane II to obtain target positions of several target counterweights.

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