Radiation self-shielding system based on PET equipment inspection
By designing a radiation self-shielding system in the inspection of PET equipment, using the front and rear shielding devices to form a closed shielding space, the problem of resource occupation by shielding room construction in the prior art is solved, the radiation shielding effect is improved, and the cost and environmental assessment are reduced. cycle.
Patent Information
- Application Number
- CN202411606819.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-02-07
AI Technical Summary
The prior art builds lead chambers or lead walls during PET equipment inspections, and builds shielding rooms to create additional demands for the floor space and funds of medical devices, and the shielding effect needs to be measured by environmental assessment equipment. The requirements for introducing environmental assessment equipment are high and the cycle is long. .
Design a radiation self-shielding system based on PET equipment inspection. By providing a front shielding device and a rear shielding device respectively in front and behind the PET scanner body, the front shielding device includes a fixed shielding shell and a movable shielding body, which can rotate relative to the fixed shielding shell. Form a closed shielding space to improve the radiation shielding ability of PET equipment.
It improves the radiation shielding ability of PET equipment during inspection, reduces radiation pollution to the environment, reduces the demand for medical devices to occupy space and funds, and reduces the cost of shielding and environmental impact assessment cycle.
Smart Images
Figure CN119385584A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of nuclear medicine radiation protection, and in particular to a radiation self-shielding system based on PET equipment inspection. Background Art
[0002] Positron emission tomography (PET) is a commonly used medical imaging technology that injects radioactive isotope drugs into the patient's body and uses gamma rays produced by the annihilation of positrons and electrons to obtain metabolic images inside the human body. However, PET produces a large amount of radiation and leaves harmful inert gases during the scanning process, ultimately producing radioactive waste. Therefore, in the field of medical imaging technology, how to prevent workers and non-examinees from radiation damage and ensure that the surrounding environment of the building is not polluted has become an important issue.
[0003] Solutions of existing technologies: Existing technical solutions mainly involve establishing radiation shielding facilities, such as lead rooms and lead walls, to form shielded rooms, where staff and non-examinees work, to prevent radiation from harming staff and non-examinees. At the same time, some measures will be taken to reduce the generation of radiation, such as optimizing scanning procedures and using low-radioactive isotopes. In addition, radiation will be monitored to ensure that the radiation dose is within a safe range.
[0004] The main problems existing in the prior art are: building a lead room or lead wall, and setting up a shielding room creates additional demand for space and funds for medical equipment. Moreover, the shielding effect needs to be determined by measuring parameters of environmental assessment equipment to determine the quality of the environment in the shielding room. The environmental assessment requirements for the introduction of environmental assessment equipment are high, and the introduction cycle of environmental assessment equipment is long. Summary of the invention
[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a radiation self-shielding system based on PET equipment inspection, which solves the technical problem of additional space and capital requirements for medical equipment when constructing a lead room or lead wall and setting up a shielding room.
[0006] In order to achieve the above object, the main technical solutions adopted by the present invention include:
[0007] On the one hand, an embodiment of the present invention provides a radiation self-shielding system based on PET equipment inspection, including a PET scanner body, characterized in that: it also includes a rear shielding device and a supporting device arranged on both sides of the PET scanner body and a front shielding device arranged above the supporting device;
[0008] The support device can be raised and lowered relative to the PET scanner body, driving the front shielding device to be raised and lowered to facilitate inspection;
[0009] The front shielding device comprises a bed capable of receiving a patient, a fixed shielding shell disposed under the bed, and a movable shielding body disposed between the fixed shielding shell and the bed;
[0010] The movable shielding body can rotate 180° relative to the fixed shielding shell along the axis of the sliding chamber to be buckled on the fixed shielding shell to form a front shielding chamber, and the front shielding chamber, the PET scanner body and the rear shielding chamber of the rear shielding device form a closed shielding space;
[0011] The bed can slide relative to the fixed shielding shell toward the inside of the PET scanner body.
[0012] Optionally, the rear shielding device and the movable shielding body are both made of lead glass.
[0013] Optionally, the fixed shielding shell is fixedly connected to the supporting device and an annular sliding chamber is formed therebetween;
[0014] The movable shielding body comprises a movable shielding shell arranged in the sliding chamber and a circular shielding door arranged at one end of the movable shielding shell.
[0015] Optionally, the fixed shielding shell and the movable shielding shell are connected by a rotating driving member, and the rotating driving member is arranged in a retention space on the front side of the PET scanner body. The rotating driving member can drive one side of the movable shielding shell to rotate relative to the fixed shielding shell so as to extend out of one side of the sliding chamber and be inserted into the gap on the other side of the sliding chamber.
[0016] Optionally, the support device includes a support shell, and a lifting drive member disposed between the support shell and the front side wall of the PET scanner body;
[0017] The supporting shell is connected to the fixed shielding shell of the movable shielding body, and the lifting drive member can drive the supporting shell to slide up and down relative to the PET scanner body to drive the movable shielding body to rise and fall to the first position or the second position.
[0018] Optionally, a main body shielding shell is provided on the outer wall of the PET scanner main body.
[0019] Optionally, the PET scanner body is provided with an oxygen supply device, a gas purification and recovery device, and an environmental lamp;
[0020] The oxygen supply device is in communication with the shielded space, and the oxygen supply device can provide oxygen to the enclosed shielded space;
[0021] The air inlet of the gas purification and recovery device is connected to the shielded space, and the air outlet of the gas purification and recovery device is connected to the oxygen supply device. The gas purification and recovery device can absorb the gas in the shielded space and purify the gas and transport it to the oxygen supply device.
[0022] Optionally, the bed and the fixed shielding shell are driven by a translation driving member.
[0023] Optionally, it also includes a front monitoring camera and a rear monitoring camera arranged on the top of the front and rear sides of the PET scanner body.
[0024] Optionally, it also includes an injection vehicle disposed on one side of the front shielding device;
[0025] The front shielding chamber is provided with an injection hole which can communicate with the injection vehicle.
[0026] The beneficial effects of the present invention are as follows: a radiation self-shielding system based on PET equipment inspection of the present invention, by respectively setting a front shielding device and a rear shielding device in front and behind the PET scanner body, and the front shielding device is provided with a fixed shielding shell and rotates relative to the fixed shielding shell to form a closed shielding space and open the shielding space, thereby improving the radiation shielding ability of the PET equipment itself during inspection and reducing radiation pollution to the environment. There is no need for staff to set up a lead room shielding room, and better shielding is performed from the source. Moreover, the requirements of the PET equipment for the scanning room are reduced, thereby reducing the cost of shielding room construction and the cycle of environmental impact assessment. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 A schematic diagram of the three-dimensional structure of the radiation self-shielding system based on PET equipment inspection of the present invention (showing that the patient movable shielding body is in the first position and the open state);
[0028] Figure 2 A schematic diagram of the three-dimensional structure of the radiation self-shielding system based on PET equipment inspection of the present invention (not showing the patient's movable shielding body in the first position and the open state);
[0029] Figure 3 It is a three-dimensional structural schematic diagram of the radiation self-shielding system based on PET equipment inspection of the present invention (the movable shielding body is in the second position and closed inspection state);
[0030] Figure 4 for Figure 3 perspective view.
[0031] Description of Reference Numerals
[0032] 1: PET scanner body; 2: rear shielding device; 3: supporting device; 4: front shielding device; 41: bed; 42: fixed shielding shell; 43: movable shielding body; 431: movable shielding shell; 432: circular shielding door;
[0033] 5: Front monitoring camera; 6: Rear monitoring camera; 7: Injection car; 8: Ambient light. DETAILED DESCRIPTION
[0034] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific implementation methods. Figure 1 The position of the middle and rear shielding device 2 relative to the PET scanner body 2 is defined as "rear"; Figure 1 The position of the middle supporting device 3 relative to the front shielding device is defined as "lower".
[0035] See also Figure 1-Figure 4 As shown, a radiation self-shielding system based on PET equipment inspection proposed in an embodiment of the present invention includes a PET scanner body 1, a rear shielding device 2 and a supporting device 3 arranged on both sides of the PET scanner body 1, and a front shielding device 4 arranged above the supporting device 3. The supporting device 3 can be lifted and lowered relative to the PET scanner body 1, driving the front shielding device 4 to be lifted and lowered to cooperate with the inspection. The front shielding device 4 includes a bed 41 capable of receiving a patient, a fixed shielding shell 42 arranged below the bed 41, and a movable shielding body 43 arranged between the fixed shielding shell 42 and the bed 41. The movable shielding body 43 can rotate 180° along the axis of the sliding chamber relative to the fixed shielding shell 42 to be buckled on the fixed shielding shell 42 to form a front shielding chamber, and the front shielding chamber, the PET scanner body 1 and the rear shielding chamber of the rear shielding device 2 form a closed shielding space. The bed 41 can slide toward the inside of the PET scanner body 1 relative to the fixed shielding shell 42.
[0036] In this embodiment, based on the accurate radiation dose calculation and simulation of the AAPM TG108 empirical formula, lead glass combined with high atomic number metal materials (such as lead and tungsten) is used to construct a fully enclosed PET device external shell to achieve radiation self-shielding during the scanning process. A radiation self-shielding system with a closed cavity opening and closing is designed to facilitate patients to enter and exit the device.
[0037] Furthermore, the rear shielding device 2 and the movable shielding body 43 are both made of lead glass. Figure 1 It is the basic structure of a self-shielding PET scanner, which consists of a rear shielding device 2 with a rear shielding shell sealed at one end, a PET scanner body 1 with a main shielding shell, a patient support device 3, a movable shielding shell 431 of a movable shielding body 43 of a front shielding device 4 that can be opened and closed, and a horizontally transported bed 41. Figure 1 The position is the height of the patient support device, which is a lower position for the convenience of the patient to go up and down, that is, the first position. At this position, the patient can enter the horizontal transport bed 41 in the patient support device 3. The rear shielding shell and the movable shielding body 43 that can be opened and closed are composed of lead glass supplemented with metal with a high molecular weight for local radiation shielding reinforcement and structural strength and rigidity reinforcement. The purpose of using transparent lead glass as the main material is to reduce the discomfort that the patient may feel in the self-shielding cavity, and at the same time facilitate the operator to observe the patient's status in the closed cavity. The PET scanner body 1 and the bottom fixed shielding shell 42 of the patient's support device 3 are completely made of metal materials with shielding effects because they are not directly related to the patient's experience and do not involve external observation of the inside. The main body is iron, and the metal with a high molecular weight is partially supplemented to ensure the shielding effect while reducing the cost.
[0038] The radiation self-shielding system based on PET equipment inspection of the present invention is provided with a front shielding device 4 and a rear shielding device 2 respectively at the front and rear of the PET scanner body 1, and the front shielding device 4 is provided with a fixed shielding shell 42 and rotates relative to the fixed shielding shell 42 to form a closed shielding space and open the shielding space, thereby improving the radiation shielding ability of the PET equipment itself during inspection and reducing radiation pollution to the environment. There is no need for staff to set up a lead room shielding room, and better shielding is performed from the source. In addition, the requirements of the PET equipment for the scanning room are reduced, thereby reducing the cost of shielding room construction and the cycle of environmental impact assessment.
[0039] Furthermore, the fixed shielding shell 42 is fixedly connected to the supporting device 3 and an annular sliding chamber is formed between the two. The movable shielding body 43 includes a movable shielding shell 431 disposed in the sliding chamber and a circular shielding door 432 disposed at one end of the movable shielding shell 431. In this embodiment, Figure 2 After the patient and the patient's support device 3 are raised to the required scanning height (second position) by the patient's support device 3, the movable shielding shell 431 that can be opened and closed rotates 180° to form a closed self-shielding cavity with the fixed shielding shell 42 at the bottom of the patient's support device 3 that is fixed. In other words, the support device 3 can be raised and lowered at any height between the first position and the second position. In addition, it should be noted that after the movable shielding shell 431 that can be opened and closed rotates, there is material overlap in the height direction with the fixed shielding shell 42 at the bottom of the patient's support device that is fixed, in the overlapping areas on the left and right sides, to ensure the shielding effect. The circular shielding door 432 at the end can rotate together with the movable shielding shell 431 that can be opened and closed, or it can be set as a separate shielding door that can be raised and lowered to achieve the functions of closing the shielding cavity and opening the shielding cavity, which is not limited too much here.
[0040] Furthermore, the fixed shielding shell 42 and the movable shielding shell 431 are connected via a rotary drive member (not shown in the figure), which is disposed in the reserved space on the front side of the PET scanner body 1, and can drive one side of the movable shielding shell 431 to rotate relative to the fixed shielding shell 42, so as to extend out of one side of the sliding chamber and be inserted into the gap on the other side of the sliding chamber. The rotary drive member of the movable shielding shell 431 that opens and closes can also be composed of any drive and transmission mechanism that meets the performance of rotary motion, such as a rotary motor, a friction wheel assembly, a guide assembly, etc., which is not limited here.
[0041] Furthermore, the support device 3 includes a support shell, and a lifting drive member disposed between the support shell and the front side wall of the PET scanner body 1. The support shell is connected to the fixed shielding shell 42 of the movable shielding body 43, and the lifting drive member can drive the support shell to slide up and down relative to the PET scanner body 1 to drive the movable shielding body 43 to be lifted to the first position or the second position. Here, the patient support device 3 can be composed of any driving and transmission mechanism that meets the lifting linear motion performance, such as a driving chain of a rotary motor, a lead screw, a guide rail, or a rotary motor, a gear rack, a guide rail, or a linear motor, a guide rail, etc., which is not limited here.
[0042] Furthermore, a main body shielding shell is provided on the outer wall of the PET scanner main body 1 .
[0043] Furthermore, an oxygen supply device, a gas purification and recovery device, and an environmental lamp 8 are provided in the PET scanner body 1. The oxygen supply device is connected to the shielded space, and the oxygen supply device can provide oxygen to the closed shielded space. The air inlet of the gas purification and recovery device is connected to the shielded space, and the air outlet of the gas purification and recovery device is connected to the oxygen supply device. The gas purification and recovery device can absorb the gas in the shielded space and purify the gas and transport it to the oxygen supply device.
[0044] In this embodiment, Figure 3 The built-in ambient light 8 is arranged in the patient scanning channel of the PET scanner body 1, and it can radiate into the closed cavity in front and behind, which is helpful to relieve the patient's cramped feeling in the closed cavity. Since the PET scanning time is relatively long, in order to ensure the safety of the patient in the self-shielded closed cavity and improve the experience, an air exchange and oxygen supply device is set in the PET scanner body 1 to provide sufficient air inside during the formation of the closed cavity. At the same time, in order to avoid the exchanged radioactive gas from polluting the environment, a gas purification and recovery device is set in the PET scanner body 1, and the pollutants are regularly concentrated and fed back to the oxygen supply device for full utilization.
[0045] Furthermore, the bed 41 and the fixed shielding shell 42 are driven by a translation driving member. Figure 4The patient is transported horizontally by the translation drive unit, and the bed 41 moves horizontally to complete the PET scan. The entire movement is completed in a self-shielded closed cavity, achieving full scanning flow equipment radiation self-shielding. The horizontal drive unit can be a linear drive unit such as a motor and a lead screw, and no further restrictions are made here.
[0046] Furthermore, it also includes a front monitoring camera 5 and a rear monitoring camera 6 which are arranged on the top of the front and rear sides of the PET scanner body 1. Figure 3 and Figure 4 The front monitoring camera 5 and the rear monitoring camera 6 are respectively arranged on the top of the front and rear sides of the scanner body and the shielding shell 2. A special image stitching algorithm is used to merge the images of the two cameras into a complete image of the closed cavity, so that the operator can further observe the interior of the scanner and the scanning status of the patient in all directions without blind spots.
[0047] It should also be noted that the selection of the type and thickness of shielding materials in different parts is mainly based on the results of Monte Carlo simulation calculations, and is gradually optimized and determined based on experimental results, and can eventually meet national standards. A 1m control zone is set near the equipment, and any person entering the 1m control zone during scanning will trigger an alarm.
[0048] This embodiment also includes a plurality of monitoring cameras, which are respectively arranged at the top of the interior of the device, so that the operator can monitor the interior space of the device and determine the position and status of the patient. It also includes a lighting mechanism, which is arranged at the top and / or bottom of the interior.
[0049] To further reduce the risk, the present invention establishes an optimized scanning and monitoring process.
[0050] A high-precision radiation monitoring system is introduced to monitor and record radiation doses in real time. The radiation monitoring system includes personal dosimeters, environmental monitors and online monitoring systems to ensure that the radiation dose is within a safe range. The monitoring data will be automatically recorded and analyzed to detect and correct any abnormalities in a timely manner.
[0051] Optimize the scanning process and introduce an injection cart next to the equipment. The patient will enter the self-shielded equipment before taking the medicine, ensuring that the patient will not cause unnecessary ionizing radiation to the environment due to movement after taking the medicine.
[0052] and develop emergency response plans to deal with possible radioactive releases.
[0053] Furthermore, it also includes an injection vehicle 7 disposed on one side of the front shielding device 4. An injection hole that can communicate with the injection vehicle 7 is disposed in the front shielding chamber. Figure 2The function of the injection cart 7 is to inject the radioactive drugs for PET scanning into the patient after the patient enters the shielded chamber, thereby optimizing the scanning flow. The existing equipment scans by injecting radioactive drugs into the patient in advance, which will cause radiation pollution to the environment in the process of the patient moving from the injection position to the equipment. The optimized scanning flow injection of radioactive drugs is to complete the patient's drug injection through a fixed interface after the PET scanner completes self-shielding, thus avoiding radiation pollution to the environment during the process. Compared with the existing method that requires patients to take drugs first, this embodiment can avoid drug contamination from the source, and an indwelling needle is placed in the hand or vein of the patient before entering. After entering, the cannula of the injection cart 7 is directly connected to it to realize drug injection.
[0054] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0056] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.
[0057] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A radiation self-shielding system based on PET equipment inspection, comprising a PET scanner body (1), characterized in that: It also comprises a rear shielding device (2) and a supporting device (3) arranged on both sides of the PET scanner body (1), and a front shielding device (4) arranged above the supporting device (3); The support device (3) can be raised and lowered relative to the PET scanner body (1), driving the front shielding device (4) to be raised and lowered to facilitate inspection; The front shielding device (4) comprises a bed (41) capable of receiving a patient, a fixed shielding shell (42) arranged below the bed (41), and a movable shielding body (43) arranged between the fixed shielding shell (42) and the bed (41); The movable shielding body (43) can rotate 180° along the axis of the sliding chamber relative to the fixed shielding shell (42) to be buckled onto the fixed shielding shell (42) to form a front shielding chamber, and the front shielding chamber, the PET scanner body (1) and the rear shielding chamber of the rear shielding device (2) form a closed shielding space; The bed (41) is capable of sliding relative to the fixed shielding shell (42) toward the inside of the PET scanner body (1).
2. The radiation self-shielding system based on PET equipment inspection as claimed in claim 1, characterized in that: The rear shielding device (2) and the movable shielding body (43) are both made of lead glass.
3. The radiation self-shielding system based on PET equipment inspection as claimed in claim 2, characterized in that: The fixed shielding shell (42) is fixedly connected to the supporting device (3) and an annular sliding chamber is formed between the two; The movable shielding body (43) comprises a movable shielding shell (431) arranged in the sliding chamber and a circular shielding door (432) arranged at one end of the movable shielding shell (431).
4. The radiation self-shielding system based on PET equipment inspection as claimed in claim 2, characterized in that: The fixed shielding shell (42) and the movable shielding shell (431) are connected via a rotating driving member, and the rotating driving member is arranged in a reserved space on the front side of the PET scanner body (1). The rotating driving member can drive one side of the movable shielding shell (431) to rotate relative to the fixed shielding shell (42) so as to extend out of one side of the sliding chamber and be inserted into a gap on the other side of the sliding chamber.
5. The radiation self-shielding system based on PET equipment inspection as claimed in claim 1, characterized in that: The support device (3) comprises a support shell, and a lifting and lowering driving member arranged between the support shell and the front side wall of the PET scanner body (1); The supporting shell is connected to the fixed shielding shell (42) of the movable shielding body (43), and the lifting drive member can drive the supporting shell to slide up and down relative to the PET scanner body (1) to drive the movable shielding body (43) to rise and fall to the first position or the second position.
6. The radiation self-shielding system based on PET equipment inspection as claimed in claim 1, characterized in that: A main body shielding shell is arranged on the outer wall of the PET scanner main body (1).
7. The radiation self-shielding system based on PET equipment inspection as claimed in claim 1, characterized in that: The PET scanner body (1) is provided with an oxygen supply device, a gas purification and recovery device, and an environmental lamp (8); The oxygen supply device is in communication with the shielded space, and the oxygen supply device can provide oxygen to the enclosed shielded space; The air inlet of the gas purification and recovery device is connected to the shielded space, and the air outlet of the gas purification and recovery device is connected to the oxygen supply device. The gas purification and recovery device can absorb the gas in the shielded space and purify the gas and transport it to the oxygen supply device.
8. The radiation self-shielding system based on PET equipment inspection as claimed in claim 1, characterized in that: The bed body (41) and the fixed shielding shell (42) are driven by a translation driving member.
9. The radiation self-shielding system based on PET equipment inspection as claimed in claim 1, characterized in that: It also includes a front monitoring camera (5) and a rear monitoring camera (6) which are arranged on the top of the front and rear sides of the PET scanner body (1).
10. The radiation self-shielding system based on PET equipment inspection as claimed in claim 1, characterized in that: It also includes an injection vehicle (7) disposed on one side of the front shielding device (4); The front shielding chamber is provided with an injection hole which can be communicated with the injection vehicle (7).