Device and method for determining position of radioactive source

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a radioactive source position determination device and method, and the device comprises a source application host which stores a radioactive source and is used for outputting the radioactive source; a plurality of groups of scale marks are arranged on the scaleplate; the source applicator is internally provided with a conveying channel for storing a radioactive source, and the conveying channel is communicated with the output end of the source application host; the conduit is used for connecting the source applying host and the source applicator; the acquisition module is used for acquiring visual images of the scale and the source applicator and radiation image information of the radioactive source; the analysis fitting module is in communication connection with the acquisition module and is configured to fit the visual image and the radiation image information sent by the acquisition module; and determining the position of the radioactive source in the source applicator according to the fitting result. With the adoption of the position determining device, the position of the radioactive source in the source applicator can be accurately determined, so that a patient can be accurately treated.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a device for determining the position of a radiation source, a method for determining the position, and a method for determining the dwell time. Background Art

[0002] Afterloading therapy is an auxiliary radiotherapy method, which is commonly used in the treatment of cancer patients in clinical practice. It uses remote control or manual transmission to transfer one or more sealed radioactive sources from the source applicator to a pre-positioned applicator, thereby performing high-dose radiotherapy on tumors in the body's cavity or between tissues to achieve the purpose of inhibiting or killing tumor cells. To calculate the irradiated dose of the tissue, it is necessary to know the residence position and residence time of the radioactive source in the applicator, that is, it is necessary to detect the residence position and residence time of the radioactive source in the applicator. The national standard stipulates that the error of the residence position shall not exceed 1mm, and the error between the measured residence time and the planned residence time shall not exceed 0.1s.

[0003] However, the applicator is usually an opaque tubular container, and the radiation emitted by the radioactive source is harmful to the human body. In existing measurement technologies, the detection of the location of the radioactive source in the applicator is usually indirect detection. For example, a fake radioactive source with a similar shape and size that is not radioactive is used for measurement and calibration. Another example is the measurement and calibration of the applicator and catheter used for treatment with a special measuring scale and matching catheter provided by the company. The measurement of the residence time is calculated by measuring the time when the source indicator light turns on and off. The above measurement and calibration methods are all implemented indirectly. There is no doubt that the location of the radioactive source determined by the indirect method will have a large error. Summary of the invention

[0004] The object of the present invention is to provide a device for determining the position of a radiation source, a method for determining the position of a radiation source and a method for determining the residence time of a radiation source, so as to more accurately determine the position of the radiation source in an applicator.

[0005] In order to achieve the above-mentioned object, the present invention provides a device for determining the position of a radiation source, the device comprising:

[0006] A source application host, storing the radioactive source and used for outputting the radioactive source;

[0007] A ruler, on which a plurality of groups of scale marks are arranged;

[0008] The source applicator has a transmission channel for storing the radioactive source, and the transmission channel is connected to the output end of the source applicator host;

[0009] A catheter, used for connecting the source applicator and the source applicator;

[0010] An acquisition module, used for acquiring visual images of the scale and the applicator and radiation image information of the radiation source;

[0011] The analysis and fitting module is connected to the acquisition module and is configured to: fit the visual image and radiation image information emitted by the acquisition module; and determine the position of the radiation source in the applicator according to the fitting result.

[0012] In some embodiments, the acquisition module includes: a shell, the scale and the applicator are located on the same side of the shell, and a through hole is opened on the first side wall of the shell facing the applicator and the scale; an optical detection unit for acquiring visual images; a detector unit, the detection end of the detector unit faces the through hole, and the detector unit is used to acquire radiation image information.

[0013] In some embodiments, the acquisition module also includes: a reflector installed in the shell and the reflective surface of the reflector is inclined with the first side wall, the emitting surface of the reflector is arranged toward the through hole, and the reflector is used to reflect the visualized image to the detection end of the optical detection unit.

[0014] In some embodiments, the angle between the plane where the reflective surface of the reflector is located and the first side wall is greater than 30 degrees and less than 60 degrees.

[0015] In some embodiments, the detector unit is located on a side of the reflector away from the reflective surface, and a detection end of the detector unit is arranged corresponding to the through hole.

[0016] In some embodiments, the position determining device further includes a support assembly, which includes: a support leg extending in a vertical direction; a mounting seat installed at the bottom end of the support leg and used to install a scale and a source applicator; and a fixing seat installed at the top end of the support leg and used to fix the collection module.

[0017] A second aspect of the present invention provides a method for determining the resident position of a radioactive source, which is applied to the above-mentioned device for determining the position of a radioactive source. The method for determining the position comprises the following steps:

[0018] Control the source applicator to output the radiation source, and the radiation source moves into the applicator through the catheter;

[0019] Controlling the acquisition module to acquire the visual image and radiation image information of the radiation source;

[0020] The analysis and fitting module is used to perform fitting according to the visual image emitted by the acquisition module and the radiation image information of the radiation source;

[0021] The first position of the radiation source in the applicator is determined according to the fitting result.

[0022] In some embodiments, the position determination method further includes the following steps: after determining the first position of the radiation source in the applicator, obtaining the first theoretical position of the radiation source output by the applicator host; comparing the first theoretical position and the first position; and performing preliminary accuracy adjustment on the applicator host based on the comparison result.

[0023] In some embodiments, the position determination method also includes the following steps: after performing preliminary precision adjustment on the source application host, controlling the source application host to adjust the position of the radiation source in the source applicator; determining the second position of the radiation source in the source applicator by analyzing the fitting module; obtaining the second theoretical position of the radiation source output by the source application host; comparing the second position with the second theoretical position; when the absolute value of the comparison difference is greater than the preset difference, adjusting the precision of the source application host again until the absolute value of the comparison difference is less than or equal to the preset difference.

[0024] A third aspect of the present invention provides a method for determining the residence time of a radiation source, which is applied to the above-mentioned device for determining the position of a radiation source. The method for determining the residence time of a radiation source includes the following steps: controlling a source application host to output the radiation source into a source applicator and setting a preset residence time; controlling an acquisition module to acquire a visualization image and a radiation image signal of the radiation source; performing fitting based on the visualization image and the radiation image signal of the radiation source emitted by the acquisition module through an analysis and fitting module; determining an entry time of the radiation source into the source applicator and an exit time when the radiation source leaves the source applicator based on the fitting results; determining an actual residence time of the radiation source in the source applicator based on the entry time and the exit time; and determining a residence time error based on the actual residence time and the preset residence time.

[0025] In the above technical scheme, the position determination device of the radiation source includes a source application host, a ruler, a catheter source applicator, a collection module and an analysis and fitting module. The source application host stores the radiation source and can output the radiation source to the source applicator, so as to provide accurate radiotherapy for the patient. The source applicator is provided with a delivery channel for the radiation source, which is connected to the catheter, and the catheter is connected to the source application host. After the radiation source is output, it can pass through the catheter and move in the delivery channel. There are multiple groups of scale marks on the ruler, and the line segments connected by each group of scale marks coincide with the delivery channel of the corresponding model source applicator. The collection module can collect the visual image of the source applicator and the ruler and the radiation image information of the radiation source. The analysis and fitting module can fit the above visual image and the radiation image information of the radiation source. According to the fitting result, the scale mark corresponding to the radiation source can be obtained to obtain the position of the radiation source in the source applicator. The above position determination device can accurately determine the position of the radiation source in the source applicator, which is conducive to calibrating the position of the radiation source fed back by the source application host, and providing more accurate radiotherapy for the patient.

[0026] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative work. In the accompanying drawings:

[0028] Figure 1 A schematic diagram of the structure of a device for determining the position of a radiation source according to an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of a collection module provided according to an embodiment of the present invention;

[0030] Figure 3 The present invention is a flowchart of a method for determining a radiation source position according to an embodiment of the present invention.

[0031] Description of Reference Numerals

[0032] 1 Source host

[0033] 2 Ruler

[0034] 3 Applicator

[0035] 4. Acquisition Module

[0036] 41 Shell

[0037] 42 Optical detection unit

[0038] 43 Detector unit

[0039] 44 Reflector

[0040] 45 Through Hole

[0041] 51 Legs

[0042] 52 Fixed seat

[0043] 53 Mounting Seat

[0044] 6 Catheter DETAILED DESCRIPTION

[0045] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0046] The following describes the device and method for determining the position of a radiation source according to the present invention with reference to the accompanying drawings. Figure 1 FIG. 1 is a schematic diagram of a structure of a device for determining the position of a radiation source according to an embodiment of the present invention. The device for determining the position of a radiation source comprises:

[0047] A source application host 1 stores a radioactive source and is used to output the radioactive source;

[0048] A ruler 2, on which a plurality of groups of scale marks are arranged;

[0049] The source applicator 3 has a delivery channel for storing the radiation source, and the delivery channel is connected to the output end of the source applicator host 1;

[0050] A conduit 6, used for connecting the source application host 1 and the source application device 3;

[0051] The acquisition module 4 is used to acquire the visual images of the scale 2 and the applicator 3 and the radiation image information of the radiation source;

[0052] The analysis and fitting module is connected to the acquisition module 4 and is configured to: fit the visual image and radiation image information emitted by the acquisition module 4; and determine the position of the radiation source in the applicator 3 according to the fitting result.

[0053] During the afterloading treatment process for tumor patients, it is necessary to place the radiation source in the patient's body to perform radiotherapy on tumor cells. Before radiotherapy, a treatment plan is designed using a treatment planning system. In the treatment plan, the most important parameter is the resident position of the radiation source in the applicator 3. During radiotherapy, the applicator 3 will be placed in the patient's body, and the source main unit 1 outputs the radiation source to the catheter 6, which is then transmitted to the applicator 3, so that tumors and other lesions are radiotherapy. In the afterloading treatment machine, the radiation source is welded to the end of the drive wire, and the source main unit 1 is started to allow the drive wire to enter the applicator 3 along the catheter 6. In afterloading treatment, there is a deviation between the actual resident position of the radiation source and the radiation source position in the radiotherapy plan, and the radiation source resident position of the source main unit 1 needs to be detected and calibrated. In view of this, an embodiment of the present invention provides a radiation source position determination device that can accurately determine the position of the radiation source in the applicator 3, so as to facilitate the calibration of the source main unit 1.

[0054] The position determination device provided in the embodiment of the present invention includes a source application host 1, a catheter 6, a ruler 2, a source applicator 3, a collection module 4 and an analysis and fitting module. The source application host 1 stores a radiation source and can output the radiation source to the source applicator 3 through the catheter 6. The source applicator 3 can be used to be inserted into the patient's body. The radiation source can move in the delivery channel in the source applicator 3. The radiation source can emit radiation rays, and the radiation rays can pass through the source applicator 3 to perform radiotherapy on the patient. There are multiple groups of scale marks on the ruler 2, and the line segments connected by each group of scale marks coincide with the delivery channel of the source applicator 3 of the corresponding model. The collection module 4 in the embodiment of the present invention can collect the visual image of the source applicator 3 and the ruler 2 and the radiation image information of the radiation source. The analysis and fitting module is connected to the collection module 4 in communication and can obtain the visual image and radiation image information. The analysis and fitting module can fit the visual image and radiation image information, and fit the scale mark line corresponding to the position of the radiation source, thereby determining the position of the radiation source in the source applicator 3. Among them, the source applicator can be selected as an interpolation needle. In a specific embodiment, the source applicator 1 further includes a driving component, which can drive the radiation source to move and feedback the moving distance of the radiation source. However, there is a deviation between the actual position of the radiation source in different applicators 3 and the position corresponding to the moving distance obtained by feedback. By adopting the above-mentioned position determination method, the actual position of the radiation source in the applicator 3 can be determined to calibrate the deviation, so that the driving component can drive the radiation source to move more accurately.

[0055] In a specific embodiment, the radiation image information can display the intensity of the radiation in the area where the applicator 3 and the scale 2 are located, the visualization image can display the sizes of the scale 2 and the applicator 3 in proportion in the image, and the analysis and fitting module can fit the two images according to the spatial coordinates to obtain a fitting image showing the intensity distribution of the radiation on the applicator 3, and the fitting image can display the scale markings corresponding to different positions of the applicator 3. According to the fitting image, the position with the strongest radiation can be determined as the actual position of the radiation source, and according to the scale markings corresponding to the actual position, the actual position can be accurately represented and determined by the scale markings.

[0056] In a specific embodiment, the device for determining the position of the radiation source further includes a fixing component (not shown in the figure), which can fix the applicator 3 on the ruler 2 so that the delivery channel of the applicator 3 is aligned with the scale mark of the ruler 2. Specifically, the delivery channel of the applicator 3 is curved, and the scale mark on the ruler 2 corresponds to the extension direction of the delivery channel, and each mark of the scale mark can uniquely determine the position of a delivery channel.

[0057] By using the above-mentioned radiation source position determination device, the position of the radiation source in the applicator 3 can be accurately determined, which facilitates correction and calibration of the radiation source position, so that the radiation source can accurately reach the preset position during radiotherapy.

[0058] In one embodiment, Figure 2 As shown, it is a schematic diagram of the structure of the acquisition module 4 provided according to an embodiment of the present invention. The acquisition module 4 includes a shell 41, an optical detection unit 42 and a detector unit 43. The scale 2 and the source applicator 3 are located on the same side of the shell 41. The shell 41 is provided with a through hole 45 on the first side wall facing the source applicator 3 and the scale 2. The optical detection unit 42 is used to collect visual images. The detection end of the detector unit 43 faces the through hole 45 and is used to collect radiation image information. The shell 41 is provided with a through hole 45 on the first side wall facing the source applicator 3 and the scale 2. The optical detection unit 42 can simultaneously collect visual images of the source applicator 3 and the scale 2 through the through hole 45. Among them, the optical detection unit 42 can be selected as a digital camera or a camera. The radiation source can emit radiation rays, and the radiation rays can be emitted outward through the source applicator 3. The detection end of the detector unit 43 is arranged toward the through hole 45, and the detector can collect the radiation rays to obtain radiation image information. In the radiation image information, the radiation dose at the location of the radiation source is significantly higher than that in other areas. The analysis and fitting module can determine the location of the radiation source based on the radiation image information, and can perform fitting based on the visualization image and the radiation image information to obtain the scale mark corresponding to the location of the radiation source, and then obtain the location of the radiation source in the applicator 3. The above two image acquisition processes do not interfere with each other, and the location of the radiation source can be accurately determined.

[0059] In one embodiment, Figure 2 As shown, the acquisition module 4 also includes a reflector 44, which is installed in the shell 41 and the reflective surface of the reflector 44 is inclined with the first side wall, and the emitting surface of the reflector 44 is arranged toward the through hole 45, and the reflector 44 is used to reflect the visualized image to the detection end of the optical detection unit 42. Because light propagates in a straight line, if the optical detection unit 42 and the detector unit 43 are both arranged toward the through hole 45, there will be a situation where the layout is difficult. The acquisition module 4 of the embodiment of the present invention also includes a reflector 44 installed in the shell 41, and the reflector 44 includes a reflective surface, which can reflect the visualized image to the detection end of the optical detection unit 42, so as to facilitate image transmission and the arrangement of the optical detection unit 42. In a specific embodiment, the reflector 44 is a plane lens.

[0060] In one embodiment, Figure 2As shown, the angle between the plane where the reflective surface of the reflector 44 is located and the first side wall is greater than 30 degrees and less than 60 degrees. Within the above-mentioned angle range, the reflector 44 can better reflect the visual image of the source 3 and the scale 2 to the optical detection unit 42, and can also make the structural layout of the optical detection unit 42 better and make the structure of the acquisition module 4 more compact.

[0061] In one embodiment, Figure 2 As shown, the detector unit 43 is located on the side of the reflector 44 away from the reflective surface, and the detection end of the detector unit 43 is arranged corresponding to the through hole 45. The radiation image information has strong penetration, while the visualization image has weak penetration. The radiation image information can continue to be transmitted to the detection end of the detector unit 43 through the reflector 44, and the radiation rays are less affected by the reflector 44. Therefore, the detector unit 43 is arranged on the side of the reflector 44 away from the reflective surface, so as to facilitate the arrangement of the detector unit 43, make the acquisition module 4 more compact, and the acquisition of the radiation image information and the visualization image does not interfere with each other.

[0062] In one embodiment, the side of the housing 41 facing the applicator 3 is made of lead material or tungsten alloy material. Lead material or tungsten alloy material is not only opaque, but also can absorb most of the radiation, reduce the erosion of the radiation on the optical detection unit 42 and the detector unit 43, and can also reduce the interference of radiation emitted in other directions on the detector unit 43. In addition, it can collect visual images more accurately and reduce the interference of external light on the optical detection unit 42.

[0063] In one embodiment, Figure 1 As shown, the position determination device further includes a bracket assembly, which includes: a leg 51, a mounting seat 53 and a fixing seat 52. The leg 51 extends in the vertical direction. The mounting seat 53 is installed at the bottom of the leg 51 and is used to install the scale 2, the fixing assembly and the source applicator 3. The fixing seat 52 is installed at the top of the leg 51 and is used to fix the acquisition module 4. The above bracket assembly can make the mounted scale 2, the source applicator 3 and the acquisition module 4 in a fixed position each time the position is determined, so as to facilitate the accurate positioning of the radiation source.

[0064] In one embodiment, a method for determining the position of a radiation source is provided, which is applied to the above-mentioned device for determining the position of a radiation source, such as Figure 3 FIG. 1 is a flow chart of a method for determining a radiation source position according to an embodiment of the present invention. The method for determining a radiation source position includes the following steps:

[0065] S101, controlling the source applicator 1 to output the radiation source, and the radiation source moves into the applicator 3 through the catheter 6;

[0066] S102, controlling the acquisition module 4 to acquire visual image and radiation image information;

[0067] S103, performing fitting according to the visual image and radiation image information emitted by the acquisition module 4 through the analysis and fitting module;

[0068] S104, determining the first position of the radiation source in the applicator 3 according to the fitting result.

[0069] The source application host 1 can not only store the radiation source, but also be used to launch the radiation source. The driving component of the source application host 1 can adjust the position of the radiation source and feedback the theoretical position of the radiation source. When determining the position of the radiation source, the position determination device first launches the radiation source into the source applicator 3 through the source application host 1, and then controls the acquisition module 4 to acquire the visualization image and radiation image information. The analysis and fitting module can analyze and fit the above two images, and then determine the first position of the radiation source in the source applicator 3. The first position is the actual position of the radiation source, and the mark corresponding to the first position can be determined by comparing with the scale mark.

[0070] In one embodiment, the position determination method further includes the following steps: after determining the first position of the radiation source in the applicator 3, obtaining the first theoretical position of the radiation source output by the source host 1; comparing the first theoretical position and the first position; and making a preliminary precision adjustment to the source host 1 according to the comparison result. The driving component of the source host 1 can drive the radiation source to move in the applicator 3 and output the first theoretical position of the radiation source, but there are differences in the internal space of different applicators 3, resulting in a difference between the first theoretical position fed back by the driving component and the actual position. The position determination method provided in the embodiment of the present invention also includes a precision correction step for the source host 1. After determining the first position of the radiation source in the applicator 3, the first theoretical position output by the driving component of the source host 1 can be obtained. The first theoretical position and the first position can be compared to obtain the deviation between the first theoretical position and the first position. According to the deviation, the preliminary precision adjustment can be made to the source host 1, so that the driving component of the source host 1 can feedback a more accurate position.

[0071] In one embodiment, the position determination method further comprises the following steps: after performing preliminary precision adjustment on the source host 1, controlling the source host 1 to adjust the position of the radiation source in the source applicator 3; determining the second position of the radiation source in the source applicator 3 by analyzing the fitting module; obtaining the second theoretical position of the radiation source output by the source host 1; comparing the second position with the second theoretical position; when the absolute value of the comparison difference is greater than the preset difference, adjusting the precision of the source host 1 again until the absolute value of the comparison difference is less than or equal to the preset difference. After performing preliminary precision adjustment on the source host 1, there may still be a situation where the deviation is large, so the theoretical position of the radiation source output by the source host 1 can be corrected, and the deviation between the theoretical position and the actual position can be compared until the deviation is less than the preset difference, and it is determined that the precision adjustment of the source host 1 is completed, and the theoretical position output by the source host 1 can be used to determine the position of the radiation source. By adopting the above-mentioned position determination method, the position of the radiation source fed back by the source host 1 can be corrected, so that the position of the radiation source output by the source host 1 is more accurate during the actual radiotherapy process, thereby accurately treating the patient.

[0072] In one embodiment, a method for determining the residence time of a radiation source is provided, which is applied to the above-mentioned device for determining the position of a radiation source. The method for determining the residence time of a radiation source includes the following steps: controlling the source application host 1 to output the radiation source to the source applicator 3 and setting a preset residence time; controlling the acquisition module 4 to acquire the visual image and the radiation image signal of the radiation source; performing fitting according to the visual image and the radiation image signal of the radiation source emitted by the acquisition module 4 through the analysis fitting module; determining the entry time of the radiation source into the source applicator 3 and the exit time when leaving the source applicator 3 according to the fitting result; determining the actual residence time of the radiation source in the source applicator 3 according to the entry time and the exit time; and determining the residence time error according to the actual residence time and the preset residence time. By adopting the above-mentioned method for determining the residence time of a radiation source, the residence time of the radiation source in the source applicator 3 can be accurately determined, which is conducive to calibrating the residence time of the radiation source fed back by the source application host 1, and performing more accurate radiotherapy on the patient.

[0073] 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 at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0074] 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 one; it can be a mechanical connection, an electrical connection, or communication with each other; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "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, without contradiction.

[0076] 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 change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A device for determining the position of a radiation source, characterized in that: The position determining device comprises: A source application host (1), storing a radioactive source and used for outputting the radioactive source; A ruler (2), wherein the ruler (2) is provided with a plurality of groups of scale marks; The source applicator (3) has a delivery channel for storing the radiation source, and the delivery channel is connected to the output end of the source applicator host (1); A catheter (6) used for connecting the source application host (1) and the source application device (3); A collection module (4) for collecting visual images of the scale (2) and the applicator (3) and radiation image information of the radiation source; The analysis and fitting module is connected to the acquisition module (4) and is configured to: Fitting the visualization image and the radiation image information emitted by the acquisition module (4); The position of the radiation source in the applicator (3) is determined according to the fitting result.

2. The device for determining the position of a radiation source according to claim 1, characterized in that: The acquisition module (4) comprises: A housing (41), wherein the scale (2) and the source applicator (3) are located on the same side of the housing (41), and a through hole (45) is provided on a first side wall of the housing (41) facing the source applicator (3) and the scale (2); An optical detection unit (42), used for collecting the visual image; A detector unit (43), wherein a detection end of the detector unit (43) faces the through hole (45), and the detector unit (43) is used to collect the radiation image information.

3. The device for determining the position of a radiation source according to claim 2, characterized in that: The acquisition module (4) further comprises: A reflector (44) is installed in the shell (41) and the reflective surface of the reflector (44) is inclined with respect to the first side wall. The emitting surface of the reflector (44) is arranged toward the through hole (45). The reflector (44) is used to reflect the visualized image to the detection end of the optical detection unit (42).

4. The device for determining the position of a radiation source according to claim 3, characterized in that: The angle between the plane where the reflection surface of the reflection element (44) is located and the first side wall is greater than 30 degrees and less than 60 degrees.

5. The device for determining the position of a radiation source according to claim 3, characterized in that: The detector unit (43) is located on a side of the reflector (44) away from the reflective surface, and a detection end of the detector unit (43) is arranged corresponding to the through hole (45).

6. The device for determining the position of a radiation source according to claim 1, characterized in that: The position determining device further comprises a bracket assembly, wherein the bracket assembly comprises: A support leg (51) extending in a vertical direction; A mounting seat (53) mounted on the bottom end of the supporting leg (51) and used for mounting the scale (2) and the source applicator (3); A fixing seat (52) is installed on the top of the supporting leg (51) and is used to fix the collection module (4).

7. A method for determining the position of a radiation source, characterized in that: Applicable to the radiation source position determination device according to any one of claims 1 to 6, the position determination method comprises the following steps: Controlling the source application host (1) to output the radiation source, and the radiation source moves into the source application device (3) through the catheter (6); Controlling the acquisition module (4) to acquire the visual image and the radiation image information; Performing fitting according to the visual image emitted by the acquisition module (4) and the radiation image information by the analysis and fitting module; The first position of the radiation source in the applicator (3) is determined according to the fitting result.

8. The method for determining the position of a radiation source according to claim 7, characterized in that: The location determination method further comprises the following steps: After determining that the first position of the radiation source in the source applicator (3) is completed, obtaining a first theoretical position of the radiation source output by the source applicator host (1); comparing the first theoretical position and the first position; According to the comparison result, preliminary accuracy adjustment is performed on the source host (1).

9. The method for determining the position of a radiation source according to claim 8, characterized in that: The location determination method further comprises the following steps: After preliminary precision adjustment is performed on the source application host (1), controlling the source application host (1) to adjust the position of the radiation source in the source applicator (3); Determining a second position of the radiation source in the applicator (3) by means of the analysis and fitting module; Obtaining a second theoretical position of the radiation source output by the source application host (1); comparing the second position with the second theoretical position; When the absolute value of the comparison difference is greater than the preset difference, the accuracy of the source host (1) is adjusted again until the absolute value of the comparison difference is less than or equal to the preset difference.

10. A method for determining the residence time of a radiation source, characterized in that: Applied to the device for determining the position of a radiation source according to any one of claims 1 to 6, the method for determining the residence time of the radiation source comprises the following steps: Controlling the source application host (1) to output the radiation source into the source application device (3) and setting a preset residence time; Controlling the acquisition module (4) to acquire the visual image and the radiation image signal of the radiation source; Performing fitting by the analysis and fitting module according to the visual image emitted by the acquisition module (4) and the radiation image signal of the radiation source; Determine, based on the fitting result, the entry time of the radiation source into the applicator (3) and the exit time of the radiation source when leaving the applicator (3); Determining the actual residence time of the radiation source in the applicator (3) according to the entry time and the exit time; A dwell time error is determined according to the actual dwell time and the preset dwell time.

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