Water mold shaking device and water mold preparation method

Abstract

The invention belongs to the technical field of nuclear medicine, and particularly relates to a water mold shaking device and a water mold preparation method, and the water mold shaking device comprises a clamp configured to limit a water mold used for nuclear medicine equipment calibration in a state of being relatively fixed with the clamp; and the driving mechanism is in transmission connection with the clamp, and the driving mechanism is used for driving the clamp to move in a mode that the at least two substances in the water mold limited in the clamp can be fully mixed. The water mold is reliably fixed through the special clamp, and the drive mechanism automatically drives the clamp to move according to a preset track and parameters, so that the problems of radiation potential safety hazards and uncontrollable mixing quality existing in manual shaking are fundamentally solved; the operation safety is obviously improved, the efficiency is improved, the uniform distribution of the radioactive liquid is ensured, the standardization of the uniform shaking process is realized, and the universality of the device to different calibration scenes and the repeatability of the preparation result are enhanced.

Description

Technical Field

[0001] This invention belongs to the field of nuclear medicine technology, specifically relating to a water model shaking device and a water model preparation method. Background Technology

[0002] In the current system homogeneity calibration of nuclear medicine equipment, a sealed thin-plate container made of transparent plexiglass is typically used as the calibration phantom. Water and radioactive liquid are injected into the phantom and thoroughly shaken to form a uniform planar radiation source. Currently, this shaking process relies entirely on manual operation by the commissioning personnel. This results in long processing times, high labor intensity, and low efficiency. Furthermore, due to the high activity of the radioactive liquid used (approximately 20 millicuries), even when wearing protective gear, operators are still susceptible to continuous close-range radiation exposure, posing a radiation safety hazard. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a water model shaking device and a water model preparation method that can improve the efficiency of water model preparation, reduce labor intensity, and avoid radiation safety hazards.

[0004] To achieve the above and other related objectives, the present invention provides a water model shaking device, comprising: A clamp is configured to confine a water phantom used for nuclear medicine equipment calibration in a fixed state relative to the clamp. A drive mechanism is connected to the clamp, the drive mechanism being used to drive the clamp to move in a manner that enables at least two substances in the water mold confined within the clamp to be fully mixed.

[0005] In an alternative embodiment of the invention, the drive mechanism is configured to drive the clamp to rotate about a first axis, the clamp being configured to restrict the flat water mold so that the normal of its surface is inclined relative to the first axis.

[0006] In an optional embodiment of the invention, the drive mechanism is configured to drive the clamp to reciprocate about the first axis.

[0007] In an optional embodiment of the present invention, the driving mechanism includes a motor and a driving control module, the driving control module being electrically connected to the motor, and the driving control module being configured to control the rotation angle, rotation direction and rotation speed of the motor.

[0008] In an optional embodiment of the present invention, the drive control module is configured to control the motor to stop at regular intervals.

[0009] In an optional embodiment of the present invention, the motor is a stepper motor, and the drive control module includes a power supply unit, a pulse generation unit, and a drive unit; the power supply unit is used to convert external AC power into DC power required for the operation of each unit; the pulse generation unit is configured to provide the drive unit with pulse signals for controlling the rotation angle and rotation speed of the motor, and level signals for controlling the rotation direction of the motor; the power supply port of the drive unit is electrically connected to the power supply unit, and the drive signal output port of the drive unit is electrically connected to the motor.

[0010] In an optional embodiment of the present invention, the drive control module further includes a delay switch unit, which is electrically connected between the power supply unit and the pulse generation unit and is used to delay turning off the power supply from the power supply unit to the pulse generation unit.

[0011] In an alternative embodiment of the invention, the clamp defines a receiving area for constraining the relative position of the water model and the clamp, the clamp including a fixed portion and a movable portion movably disposed relative to the fixed portion, the movable portion being configured to change the size of the receiving area when it moves relative to the fixed portion.

[0012] In an optional embodiment of the present invention, the fixing part includes a base surface for abutting against one side surface of the flat plate-shaped water mold, and the movable part is movably disposed relative to the fixing part in a direction parallel to the base surface, and at least the movable part is provided with a claw for securing the edge of the flat plate-shaped water mold.

[0013] In an optional embodiment of the present invention, a locking mechanism is provided between the movable part and the fixed part, the locking mechanism being configured to hold the movable part relative to the fixed part in a plurality of different positions and to release the movable part from the plurality of different positions.

[0014] To achieve the above and other related objectives, the present invention also provides a method for preparing a water model, comprising the following steps: Provide a flat container with at least two transparent sides; Water and radioactive liquid are injected into the flat-plate container until it is filled to at least 95% of its volume, and the injection port of the flat-plate container is then sealed. The flat container is installed in the clamp of the water model shaking device; The drive mechanism of the water model shaking device is activated to mix the water and radioactive liquid evenly until a stop command is received from the user or a preset time is reached, at which point the drive mechanism is controlled to stop.

[0015] The technical advantages of this invention are as follows: The water model shaking device provided by this invention reliably fixes the water model with a special clamp, and the driving mechanism automatically drives the clamp to move according to a preset trajectory and parameters. This technical solution fundamentally solves the problems of radiation safety hazards and uncontrollable mixing quality associated with manual shaking. First, automated operation keeps personnel completely away from high-activity radioactive sources, completely eliminating the risk of radiation exposure and significantly improving operational safety. Second, the precise and controllable driving mechanism ensures that the mechanical conditions for each shaking are consistent and controllable, which not only greatly shortens the mixing time and improves efficiency, but also ensures that the radioactive liquid achieves a highly uniform distribution in the water model, thereby guaranteeing the accuracy and reliability of uniformity calibration from the source. Finally, the driving parameters of the automated device can be precisely adjusted, allowing it to quantitatively set the optimal rotation angle, speed, acceleration, and shaking time according to the size, shape, and liquid characteristics of different water models, realizing the standardization of the shaking process and greatly enhancing the universality of the device for different calibration scenarios and the repeatability of the preparation results. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structural principle of the water model shaking device provided in an embodiment of the present invention; Figure 2 This is a front view of the fixture provided in an embodiment of the present invention; Figure 3 yes Figure 2 AA section view; Figure 4 This is a flowchart of the water model preparation method provided in the embodiments of the present invention. Detailed Implementation

[0017] The following specific examples illustrate the implementation 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 embodiments, and 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. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0018] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0019] In nuclear medicine equipment calibration, water phantoms serve as a reference plane source for homogeneity calibration. Their function is to simulate an ideal, uniform distribution of radioactive sources, providing a standard reference field for the system, thereby detecting and correcting detector response inhomogeneities. The calibration principle is based on the imaging response of nuclear medicine equipment to the distribution of radioactive sources. Specifically, when the radioactive liquid achieves a completely uniform distribution within the phantom, the acquired image should theoretically exhibit a uniform count distribution. Any count differences in the image reflect the detector's own inhomogeneity, which needs to be compensated for using software correction coefficients. Therefore, the homogeneity of the radioactive material in the water phantom is crucial. Inhomogeneous mixing can lead to an activity gradient within the calibration source itself, resulting in pseudo-inhomogeneities that will be incorrectly included in the correction parameters, introducing systematic errors and severely impacting the accuracy and reliability of subsequent quantitative analysis of clinical images. In some schemes, the radioactive liquid and water in the water model are mixed entirely by manual shaking by the commissioning personnel. The commissioning personnel hold the model filled with radioactive liquid and water and mix the liquid by repeatedly tilting, shaking and swaying it. This process takes about 20-30 minutes. The main drawbacks of this manual mixing method are: on the one hand, the personnel must operate the high-activity radioactive source at close range continuously. Even if protective clothing is worn, it cannot shield all rays. Moreover, long-term operation will lead to radiation dose accumulation, which will seriously endanger the safety of personnel. On the other hand, the frequency, amplitude and trajectory of manual shaking are random, resulting in low mixing efficiency and difficulty in ensuring the uniformity of mixing. Therefore, this invention provides an automatic shaking device and a corresponding water model preparation method for nuclear medicine homogeneity calibration water models. The device securely clamps the water model filled with liquid using a special clamp, and a precision drive mechanism automatically drives the clamp to shake the model according to a preset, repeatable motion trajectory and frequency. This technical solution completely liberates personnel from direct manual operation and completely avoids the radiation exposure risk caused by the debugging personnel coming into close contact with the radioactive source during the shaking process. At the same time, the automated drive ensures that the mechanical conditions such as the amplitude, speed, acceleration, and motion mode of each shaking are highly consistent and controllable, thereby efficiently and reliably distributing the radioactive liquid in the water model evenly. This significantly improves operational safety while ensuring the quality and preparation efficiency of the calibration source itself.

[0020] The technical solution of the present invention will be described in detail below with reference to specific embodiments: Please see Figure 1 As shown, an embodiment of the present invention provides a water model mixing device, which includes a clamp 10 and a drive mechanism 20; the clamp 10 is configured to confine a water model for nuclear medicine equipment calibration in a fixed state relative to the clamp 10; the drive mechanism 20 is drively connected to the clamp 10, and the drive mechanism 20 is used to drive the clamp 10 to move in a manner that enables at least two substances in the water model confined in the clamp 10 to be fully mixed.

[0021] The water model shaking device provided by this invention reliably fixes the water model with a special clamp 10, and the driving mechanism 20 automatically drives the clamp 10 to move according to a preset trajectory and parameters. This technical solution fundamentally solves the problems of radiation safety hazards and uncontrollable mixing quality associated with manual shaking. First, automated operation keeps personnel completely away from high-activity radioactive sources, completely eliminating the risk of radiation exposure and significantly improving operational safety. Second, the precise and controllable driving mechanism ensures that the mechanical conditions for each shaking are consistent and controllable, which not only greatly shortens the mixing time and improves efficiency, but also ensures that the radioactive liquid achieves a highly uniform distribution in the water model, thereby guaranteeing the accuracy and reliability of uniformity calibration from the source. Finally, the driving parameters of the automated device can be precisely adjusted, allowing it to quantitatively set the optimal rotation angle, speed, acceleration, and shaking time according to the size, shape, and liquid characteristics of different water models, realizing the standardization of the shaking process and greatly enhancing the universality of the device for different calibration scenarios and the repeatability of the preparation results.

[0022] Please see Figure 1 , 3 As shown, in an optional embodiment of the present invention, the drive mechanism 20 is configured to drive the clamp 10 to rotate about a first axis X, and the clamp 10 is configured to restrict the flat water mold so that the normal Y of its surface is inclined relative to the first axis X. In this embodiment, by configuring the drive mechanism 20 to drive the clamp 10 to rotate around the first axis X, and fixing the flat water mold with its surface normal inclined relative to the axis of rotation, the diffusion and fusion process of the radioactive liquid and water is significantly accelerated. Specifically, the inclined installation angle allows a single circular motion to generate a force field acting on both the surface and thickness directions of the water mold when the water mold rotates with the clamp 10. This causes the liquid in the water mold to not only generate large-scale convection in the plane parallel to the surface, but also to form an effective mixing vortex in the thickness direction perpendicular to the surface. This completely breaks the laminar flow limitation that is easily generated by the thin-layer structure of the mold, and realizes efficient three-dimensional disturbance. This design enables water and radioactive liquid to achieve molecular-level uniform distribution in a shorter time, fundamentally ensuring that the planar radioactive source used as a calibration reference has extremely high internal uniformity.

[0023] Please see Figure 1 , 3As shown, in an optional embodiment of the present invention, the driving mechanism 20 is configured to drive the clamp 10 to reciprocate around the first axis X. In this embodiment, the driving mechanism 20 is further configured to drive the clamp 10 to reciprocate around the first axis X, which can efficiently eliminate local concentration dead zones and improve mixing uniformity and mixing efficiency. Specifically, the inherent periodic forward and reverse acceleration and deceleration process of the reciprocating rotation causes the liquid in the water model to be continuously subjected to inertial impact forces with alternating directions. This alternating mechanical action can effectively break the static equilibrium and laminar flow state inside the liquid. The violent relative motion generated by the liquid due to inertia at each speed reversal greatly enhances the internal shear and turbulence effects. Compared with unidirectional uniform rotation, this oscillating mixing method can prevent radioactive materials from depositing or lingering in specific areas due to density differences, thereby achieving faster and more thorough uniform mixing in three-dimensional space, further improving preparation efficiency and mixing quality.

[0024] It should be understood that the movement mode of the clamp 10 is not unique. For example, in some other embodiments, the drive mechanism 20 can be configured to make the water model rotate around the first axis X and reciprocate around an axis perpendicular to it. This compound motion mode can generate more complex and turbulent three-dimensional fluid dynamics effects. The rotational motion provides the basic centrifugal force, while the reciprocating oscillation in the vertical axis periodically changes the vector direction of the centrifugal force and the pressure gradient inside the liquid. This compound disturbance with continuously changing direction can highly effectively destroy the stable flow layer or symmetrical vortex that may be formed inside the liquid, so that the mixing process can achieve molecular-level homogeneity in a shorter time, thereby further improving the mixing efficiency, adaptability and reliability of the device.

[0025] Please see Figure 1As shown, in an optional embodiment of the present invention, the drive mechanism 20 includes a motor 21 and a drive control module 22. The drive control module 22 is electrically connected to the motor 21. The output shaft of the motor 21 can be directly connected to the clamp 10, or it can be connected to the clamp 10 through some transmission structure. For example, a reducer, coupling, or other transmission structure can be provided between the output shaft of the motor 21 and the clamp 10. The drive control module 22 is configured to control the rotation angle, rotation direction, and rotation speed of the motor 21. In this embodiment, by setting a drive mechanism 20 including a motor 21 and a matching drive control module 22, and configuring the drive control module 22 to precisely control the rotation angle, rotation direction, and rotation speed of the motor 21, the versatility, adaptability, and controllability of calibration quality of the device are enhanced. Specifically, the drive control module 22 makes the shaking process of the water model no longer a fixed and rigid mechanical repetition, but can flexibly and precisely set and execute the optimal combination of motion parameters (such as reciprocating oscillation at a specific angle, variable speed rotation, etc.) according to the specific specifications of different water models (such as size, shape), internal liquid characteristics (such as volume, viscosity), and the final required mixing uniformity standard. This not only ensures the high efficiency and high consistency of each shaking operation, but also improves the controllability of the shaking process.

[0026] In specific embodiments, the optimal installation angle and driving parameters for water models of different specifications can be determined experimentally. To avoid harm to the human body from radioactive materials, their use must be avoided during the experiment. For example, an alternative can be found to observe whether the water model has been shaken evenly. In some embodiments, a fluorescent agent can be used as an alternative. The fluorescent agent can completely mix the water without affecting the reusability of the model, and the shaking effect can be easily observed using a detection instrument.

[0027] Please see Figure 1 As shown, in an optional embodiment of the present invention, the drive control module 22 is configured to control the motor 21 to stop at a set time. In this embodiment, configuring the drive control module 22 to control the motor 21 to stop at a set time achieves precise automatic control of the total shaking time. Specifically, the timed stop function provides preset and reliable stopping conditions for the shaking process, fundamentally replacing manual timing and judgment, ensuring the repeatability and standardization of each operation, freeing operators from continuous monitoring. In addition, the timed stop function enables the entire shaking process to implement an intermittent or pulsed automated mixing strategy, while providing a basis for the linkage control of the device with other sensors (such as temperature and uniformity monitoring), further optimizing mixing efficiency and final uniformity.

[0028] Please see Figure 1As shown, in an optional embodiment of the present invention, the motor 21 is a stepper motor, and the drive control module 22 includes a power supply unit 221, a pulse generation unit 222, and a drive unit 223; the power supply unit 221 is used to convert external AC power into DC power required for the operation of each unit; the pulse generation unit 222 is configured to provide the drive unit 223 with pulse signals for controlling the rotation angle and rotation speed of the motor 21, and level signals for controlling the rotation direction of the motor 21; the power supply port of the drive unit 223 is electrically connected to the power supply unit 221, and the drive signal output port of the drive unit 223 is electrically connected to the motor 21. In this embodiment, by using a stepper motor as the driving element and configuring a drive control module 22 consisting of a power supply unit 221, a pulse generation unit 222, and a drive unit 223, the overall structure is optimized and manufacturing costs are controlled. Specifically, this architecture transforms complex motion control into control of pulse frequency, pulse quantity, and level signals, which greatly simplifies the structure and control process of the entire system. It eliminates the need for complex speed loop or position loop feedback systems, thereby significantly reducing hardware costs and software development complexity. At the same time, standardized unit modules facilitate production and maintenance, enabling the device to simplify the overall structure and reduce equipment costs while ensuring accurate and reliable execution of preset shaking actions, which is conducive to the promotion and application of this automated device.

[0029] Please see Figure 1 As shown, in an optional embodiment of the present invention, the drive control module 22 further includes a delay switch unit 224, which is electrically connected between the power supply unit 221 and the pulse generation unit 222, and is used to delay the power supply from the power supply unit 221 to the pulse generation unit 222. As an independent hardware timer, the delay switch unit 224 can directly cut off the power supply to the pulse generation unit 222 after a preset shaking time, thereby physically causing the stepper motor to stop immediately due to the loss of control pulses. This shutdown mechanism is not only simple in structure and reliable in operation, achieving precise automatic timed stop function, but also avoids unnecessary idle operation of the control unit during the waiting period, reducing the overall power consumption of the system. It provides a low-cost, high-reliability automatic stop solution for the device, further simplifying the operation process.

[0030] Please see Figure 1As shown, in an optional embodiment, the power supply unit 221, pulse generation unit 222, drive unit 223, and delay switch unit 224 can be, for example, a D-400 AC / DC power supply board, an RFMF-1 pulse generator, an MA860 motor drive board, and a delay relay, respectively; wherein the +24V port of the D-400 AC / DC power supply board is connected to the DC+ port and COM port of the delay relay, respectively; the -24V port of the D-400 AC / DC power supply board is connected to the DC- port of the delay relay and the GND port of the RFMF-1 pulse generator, respectively; the NO port of the delay relay is connected to the V+ port of the RFMF-1 pulse generator, and the RFMF-1 pulse generator... The OPTO port of the pulse generator is connected to the PUL+ and DIR+ ports of the MA860 motor drive board, respectively. The PUL port of the RFmf-1 pulse generator is connected to the PUL- port of the MA860 motor drive board, the DIR port of the RFmf-1 pulse generator is connected to the DIR- port of the MA860 motor drive board, the +48V port of the D-400 AC / DC power supply board is connected to the VCC port of the MA860 motor drive board, the -48V port of the D-400 AC / DC power supply board is connected to the GND port of the MA860 motor drive board, and each drive current output port of the MA860 motor drive board is connected to each coil terminal of the motor 21.

[0031] It should be understood that the D-400 AC / DC power supply board, RFMF-1 pulse generator, MA860 motor drive board, and time delay relay described above are only one specific hardware selection example to meet the system functional requirements. In actual implementation, the specific component models of the drive control module 22 are not fixed. Those skilled in the art can select other equivalent or better power modules, signal generators, motor drivers, and timer switches with corresponding functions to replace or combine them according to different requirements of cost, size, control accuracy, power level, and environmental adaptability in specific application scenarios, without deviating from the core architecture of this invention, which achieves precise motion control and timed stop of motor 21 through power supply unit 221, pulse generation unit 222, drive unit 223, and time delay switch unit 224. This also falls within the protection scope of this invention.

[0032] Similarly, the above embodiments use a stepper motor and its matching control module as an example for illustration, but the driving scheme of the present invention is not limited to this. Those skilled in the art will understand that the motor 21 can also be a servo motor, a brushless DC motor or other types of rotary drive elements; accordingly, the architecture and specific device selection of the drive control module 22 can also be adjusted accordingly. For example, a servo driver scheme containing position and speed feedback closed loop can be adopted. As long as it can accurately control the fixture 10 to move according to the preset angle, direction, speed and time, it falls within the protection scope of the present invention.

[0033] Please see Figure 2 , 3 As shown, in an optional embodiment of the invention, the clamp 10 defines a receiving area 101 for constraining the relative position of the water model and the clamp 10. The clamp 10 includes a fixed part 11 and a movable part 12 disposed relative to the fixed part 11. The movable part 12 is configured to change the size of the receiving area 101 when it moves relative to the fixed part 11. In this embodiment, by designing the clamp 10 to include a fixed part 11 and a movable part 12 that can change the size of the receiving area 101, the universal adaptability of the device is improved. Specifically, the movable part 12 allows a single clamp 10 to firmly and accurately clamp flat water phantoms of different sizes by adjusting its receiving space, without the need to equip each water phantom with a dedicated clamp 10. This adjustable structure ensures that water phantoms of various sizes, from micro-experimental phantoms to large clinical calibration phantoms, can be stably fixed, and the relative tilt angle between the normal direction of the plate surface and the drive axis can also be kept consistent, thereby ensuring the consistency and effectiveness of the subsequent shaking motion. This not only greatly expands the applicability of the device and reduces the equipment replacement or adjustment costs when using water phantoms of different sizes, but also further improves the standardization and convenience of the entire calibration preparation process.

[0034] Please see Figure 2 , 3 As shown, in an optional embodiment of the present invention, the fixing part 11 includes a base surface 111 for abutting against one side surface of the flat plate-shaped water mold, and the movable part 12 is movably disposed relative to the fixing part 11 in a direction parallel to the base surface 111. At least the movable part 12 is provided with a claw 13 for securing the edge of the flat plate-shaped water mold. The base surface 111 provides a stable and flat back support reference for the water model, ensuring the orientation and posture of the water model surface. The movable part 12 moves parallel to the base surface 111 and, in conjunction with the claw 13, applies a uniform lateral clamping force from the edge of the water model. This clamping method not only effectively prevents the water model from sliding during high-speed shaking, ensuring a constant geometric relationship between it, the clamp 10, and the drive axis, but more importantly, it applies force through edge clamping, avoiding direct pressure on the large surface area of ​​the water model. This minimizes the deformation or stress impact that the clamp 10 itself may cause to the water model structure, thus achieving stable fixation while ensuring the structural integrity of the water model as a precision calibration container. Figure 2 As shown, in some embodiments, a claw 13 may also be provided on the fixing part 11.

[0035] It should be understood that the clamp 10, which consists of the base surface 111 of the fixing part 11 and the movable part 12 with claws 13, described in the above embodiments is only a preferred structure for achieving a stable clamping function. Within the scope of the present invention, the specific implementation of the clamp 10 is not limited to this. For example, in some other embodiments, the clamp 10 may also be a structure with two oppositely arranged movable clamping arms that move synchronously towards or away from each other, clamping and fixing the water model from two opposite sides simultaneously through the two clamping arms; or, the clamp 10 may be in the form of a flexible binding strap or adjustable binding strap in conjunction with a rigid back plate, using the tightening strap to adapt to water models of different thicknesses and provide uniform enveloping constraints. As long as the structure can restrict flat water models of different specifications to a state of relative fixation with the clamp 10 and ensure their stability during rocking motion, it should be considered an equivalent substitution or simple variation of the present invention and fall within the protection scope of the present invention.

[0036] Please see Figure 3 As shown, in an optional embodiment of the present invention, a locking mechanism is provided between the movable part 12 and the fixed part 11. The locking mechanism is configured to hold the movable part 12 relative to the fixed part 11 in multiple different positions and to release the movable part 12 from the multiple different positions. The locking mechanism provides discrete and stable positioning points for the movable part 12, enabling the operator to quickly and accurately adjust the movable part 12 to a preset position that adapts to a specific water mold width and reliably lock it, effectively preventing accidental displacement of the movable part 12 due to vibration or inertia during subsequent vigorous shaking. At the same time, the release function allows the clamp 10 to be easily reset to adapt to the next specification of water mold, which not only ensures the repeatability and reliability of each clamping, thereby ensuring the consistency of the water mold posture, but also greatly simplifies the operation process when changing water molds, improving the overall efficiency of the equipment and the user experience.

[0037] Please see Figure 3 As shown, in a specific embodiment, the movable part 12 and the fixed part 11 can be respectively provided with a guide part 112 and a guided part 121 for guiding their relative movement. The locking mechanism can be, for example, a pre-tightening bolt 14 provided on the guide part 112. When the pre-tightening bolt 14 is tightened, it can press the guided part 121, so that the movable part 12 and the fixed part 11 remain relatively fixed. When the pre-tightening bolt 14 is loosened, it can separate from the guided part 121, so that the movable part 12 can move relative to the fixed part 11.

[0038] It should be understood that the locking mechanism achieved by pressing the guided part 121 with the pre-tightening bolt 14 in the above embodiments is only one specific implementation of the locking mechanism. This invention does not limit the specific structure of the locking mechanism. Any mechanical or electromechanical structure capable of reliably locking the movable part 12 at different positions relative to the fixed part 11 and releasing it for position adjustment when needed falls within the scope of protection of this invention. For example, in some other embodiments, the locking mechanism may also be a pin-and-a-series positioning hole mating structure, a ratchet-equipped snap-fit ​​structure, or a friction braking device controlled by an electromagnet. These alternative solutions can also achieve the function of rapid locking and releasing, meeting the different needs of the clamp 10 during the adjustment and fixing stages.

[0039] Please see Figure 4 As shown, embodiments of the present invention also provide a method for preparing a water model, the method comprising the following steps: S1: Provide a flat container with at least two transparent sides; specifically, the flat container may be a hollow, sealable thin-plate container formed by bonding two transparent acrylic sheets together with a frame around their perimeter.

[0040] S2: Inject water and radioactive liquid into the flat plate container until it is at least 95% full, and then seal the inlet of the flat plate container; the ratio of water to radioactive liquid can be freely selected according to the calibration requirements of different nuclear medicine equipment.

[0041] S3: Install the flat container onto the clamp 10 of the water mold shaking device.

[0042] S4: Activate the drive mechanism 20 of the water model shaking device to mix the water and radioactive liquid evenly until a stop command is received from the user or a preset time is reached, then control the drive mechanism 20 to stop.

[0043] This method transforms the original manual mixing process, which relied on human experience, posed radiation risks, and resulted in unstable quality, into a safe, efficient, and precisely reproducible standardized preparation process. It ensures that the entire process from raw materials to water model preparation is controllable, not only completely eliminating radiation exposure for operators but also fundamentally guaranteeing that each prepared water model has a high and verifiable internal homogeneity through mechanical reliability and procedural consistency. This lays a reliable foundation for the accurate calibration of nuclear medicine equipment.

[0044] In summary, this invention reliably fixes the water model using a dedicated clamp 10, and the drive mechanism 20 automatically drives the clamp 10 to move according to a preset trajectory and parameters. This fundamentally solves the problems of radiation safety hazards and uncontrollable mixing quality associated with manual shaking. First, automated operation keeps personnel completely away from high-activity radioactive sources, eliminating radiation exposure risks and significantly improving operational safety. Second, the precise and controllable drive mechanism ensures consistent and controllable mechanical conditions for each shaking, not only greatly shortening mixing time and improving efficiency, but also ensuring a highly uniform distribution of radioactive liquid within the water model, thus guaranteeing the accuracy and reliability of uniformity calibration from the source. Finally, the drive parameters of the automated device can be precisely adjusted, allowing for the quantitative setting of optimal rotation angle, speed, acceleration, and shaking time based on the size, shape, and liquid characteristics of different water models. This standardizes the shaking process and greatly enhances the universality of the device for different calibration scenarios and the repeatability of the preparation results.

[0045] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0046] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Claims

1. A water model shaking device, characterized in that, include: A clamp is configured to confine a water phantom used for nuclear medicine equipment calibration in a fixed state relative to the clamp. A drive mechanism, connected to the clamp, is used to drive the clamp to move in a manner that enables at least two substances in the water mold confined within the clamp to be fully mixed.

2. The water model shaking device according to claim 1, characterized in that, The drive mechanism is configured to drive the clamp to rotate about a first axis, and the clamp is configured to restrict the flat water mold so that the normal of its surface is tilted relative to the first axis.

3. The water model shaking device according to claim 2, characterized in that, The drive mechanism is configured to drive the clamp to reciprocate about the first axis.

4. The water model shaking device according to claim 1, characterized in that, The drive mechanism includes a motor and a drive control module. The drive control module is electrically connected to the motor and is configured to control the rotation angle, rotation direction, and rotation speed of the motor.

5. The water model shaking device according to claim 4, characterized in that, The drive control module is configured to control the motor to stop at regular intervals.

6. The water model shaking device according to claim 4 or 5, characterized in that, The motor is a stepper motor, and the drive control module includes a power supply unit, a pulse generation unit, and a drive unit. The power supply unit is used to convert external AC power into DC power required for the operation of each unit. The pulse generation unit is configured to provide the drive unit with pulse signals for controlling the rotation angle and rotation speed of the motor, as well as level signals for controlling the rotation direction of the motor. The power supply port of the drive unit is electrically connected to the power supply unit, and the drive signal output port of the drive unit is electrically connected to the motor.

7. The water model shaking device according to claim 6, characterized in that, The drive control module further includes a delay switch unit, which is electrically connected between the power supply unit and the pulse generation unit, and is used to delay the power supply from the power supply unit to the pulse generation unit.

8. The water model shaking device according to claim 1, characterized in that, The clamp defines a receiving area for constraining the relative position of the water model and the clamp. The clamp includes a fixed part and a movable part movably disposed relative to the fixed part. The movable part is configured to change the size of the receiving area when it moves relative to the fixed part.

9. The water model shaking device according to claim 8, characterized in that, The fixing part includes a base surface for abutting against one side of the flat plate-shaped water mold, and the movable part is movably disposed relative to the fixing part in a direction parallel to the base surface. At least the movable part is provided with a claw for securing the edge of the flat plate-shaped water mold.

10. The water model shaking device according to claim 8 or 9, characterized in that, A locking mechanism is provided between the movable part and the fixed part. The locking mechanism is configured to hold the movable part in multiple different positions relative to the fixed part and to release the movable part from the multiple different positions.

11. A method for preparing a water model, characterized in that, Includes the following steps: Provide a flat container with at least two transparent sides; Water and radioactive liquid are injected into the flat-plate container until it is filled to at least 95% of its volume, and the injection port of the flat-plate container is then sealed. The flat container is installed in the clamp of the water model shaking device according to any one of claims 1 to 10; The drive mechanism of the water model shaking device is activated to mix the water and radioactive liquid evenly until a stop command is received from the user or a preset time is reached, at which point the drive mechanism is controlled to stop.

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