Display system and display method for a beam spot scanning path of a particle beam therapy

Abstract

This invention provides a display system and method for the beam spot scanning path in particle beam therapy. The display system includes: a detection device for acquiring multiple sets of voltage signals of the particle beam during the scanning process at preset fixed time intervals; wherein, a set of voltage signals is acquired simultaneously; a processing device for receiving the multiple sets of voltage signals of the particle beam; the processing device is further used to calculate the corresponding instantaneous beam spot position for each set of voltage signals, and to fuse a preset number of instantaneous beam spot positions to obtain an effective beam spot position; and to integrate the preset number of multiple sets of voltage signals to obtain a relative dose; and a display device for sequentially visualizing each effective beam spot position and its corresponding relative dose in chronological order to form a beam spot scanning path. This invention enables doctors to understand the scanning status of the particle beam in a timely manner, thereby improving the accuracy and efficiency of treatment.

Description

Technical Field

[0001] This invention relates to the field of medical technology, and in particular to a display system and method for displaying the beam scan path of particle beam therapy. Background Technology

[0002] Particle beam therapy is a radiotherapy technique that uses beams of particles such as protons and heavy ions to precisely irradiate tumors. During particle beam therapy, real-time monitoring of the dose distribution and position of the particle beam is necessary to ensure the accuracy and safety of the treatment. The particle beam scans the tumor region at microsecond speeds, with each spot irradiated for an extremely short time (milliseconds), imperceptible to the naked eye. Current technologies, through real-time monitoring of the particle beam, only obtain parameters such as dose distribution and position. The lack of a system that can visually display the state of the beam spot scanning path makes it difficult to observe the particle beam scanning in a timely manner, affecting the quality and efficiency of treatment. Therefore, improvements are needed. Summary of the Invention

[0003] This invention provides a display system and method for displaying the beam spot scanning path in particle beam therapy, in order to solve the technical problem in the prior art that the beam spot scanning path status cannot be displayed.

[0004] This invention provides a display system for beam spot scanning paths in particle beam therapy, comprising: The detection device is used to collect multiple sets of voltage signals of the particle beam during the scanning process at preset fixed time intervals; wherein, one set of voltage signals is collected at the same time. Processing device for receiving multiple sets of voltage signals from the particle beam; The processing device is also used to calculate the corresponding instantaneous beam spot position for each group of voltage signals, and to fuse a preset number of instantaneous beam spot positions to obtain an effective beam spot position; and to perform integration processing on a preset number of multiple groups of voltage signals to obtain a relative dose; The display device is used to visualize each effective beam spot position and its corresponding relative dose in chronological order to form a beam spot scanning path.

[0005] In one embodiment of the present invention, the detection device includes: The ionization chamber has multiple detection electrodes, all of which generate corresponding charge signals when they receive a particle beam. An electrometer, connected to all detection electrodes, is used to convert received charge signals into multiple sets of corresponding voltage signals at preset fixed time intervals.

[0006] In one embodiment of the present invention, the processing device is further configured to perform the following processing on each group of voltage signals: The electrode position corresponding to the maximum voltage signal is taken as the instantaneous beam spot center; Gaussian fitting is performed on the coordinates of the electrode positions corresponding to other voltage signals in the X direction to obtain the first normal distribution curve, and the electrode positions corresponding to the first normal distribution curve that are outside the preset probability are deleted. Gaussian fitting is performed on the coordinates of the electrode positions corresponding to other voltage signals in the Y direction to obtain the second normal distribution curve, and the electrode positions corresponding to the second normal distribution curve that are outside the preset probability are deleted. The instantaneous beam spot position is obtained based on the remaining electrode positions.

[0007] In one embodiment of the present invention, the remaining electrode positions in each group of voltage signals satisfy the following: ; ; in, This is represented by the coordinates of the remaining electrode positions in the X direction. This is represented by the coordinates of the remaining electrode positions in the Y direction. Let the standard deviation of the first normal distribution curve be denoted as . It is expressed as the mathematical expectation of the first normal distribution curve. The standard deviation of the second normal distribution curve is represented by the standard deviation of the second normal distribution curve. It is represented as the mathematical expectation of the second normal distribution curve.

[0008] In one embodiment of the present invention, the processing device is further configured to superimpose a preset number of instantaneous beam spot positions on a preset plane to fuse them into an effective beam spot position.

[0009] In one embodiment of the present invention, the processing device is further configured to perform the following processing on a preset number of multiple sets of voltage signals: Integrate and sum the voltage values ​​corresponding to each group of voltage signals to obtain the integral value of each group of voltage signals; A relative dose is obtained by weighted summation of all integral values ​​corresponding to a preset number of voltage signals.

[0010] In one embodiment of the present invention, the display device is used to sequentially display each effective beam spot position and its corresponding relative dose in a two-dimensional coordinate system in the form of points; wherein, the horizontal and vertical coordinates of the two-dimensional coordinate system display the outline distribution of the effective beam spot positions, and the relative dose corresponding to each effective beam spot position is displayed by the type of color, brightness and / or marker size.

[0011] In one embodiment of the present invention, the multi-electrode ionization chamber is a parallel plate-strip ionization chamber with an effective area of ​​300mm×300mm~400mm×400mm and a thickness of 5mm~10mm, and is provided with 64~128 metal strip electrodes inside.

[0012] In one embodiment of the present invention, the sampling frequency of the particle beam collected by the detection device is 40kHz to 60kHz, and the time for the detection device to collect a preset number of multiple sets of voltage signals is 100μs to 250μs.

[0013] This invention also proposes a method for displaying the beam spot scanning path in particle beam therapy, comprising: Multiple sets of voltage signals of the particle beam during the scanning process are collected at preset fixed time intervals; among them, one set of voltage signals is collected at the same time. The system receives multiple sets of voltage signals from the particle beam; calculates the corresponding instantaneous beam spot position for each set of voltage signals, and fuses a preset number of instantaneous beam spot positions to obtain an effective beam spot position; and integrates the preset number of multiple sets of voltage signals to obtain a relative dose. In chronological order, each effective beam spot location and its corresponding relative dose are visualized to form a beam spot scanning path.

[0014] The beneficial effects of this invention are as follows: This invention proposes a display system and method for beam spot scanning paths in particle beam therapy. First, a detection device continuously acquires particle beam data at preset fixed time intervals, obtaining multiple sets of voltage signals during the scanning process. Second, after receiving the multiple sets of voltage signals from the particle beam, a processing device calculates the corresponding instantaneous beam spot position for each set of voltage signals and merges a preset number of instantaneous beam spot positions into one effective beam spot position, corresponding to one beam spot. The preset number of voltage signals are also integrated to obtain the relative dose corresponding to one beam spot. Finally, the display device sequentially visualizes each effective beam spot position and its corresponding relative dose in chronological order to form a beam spot scanning path. This invention allows doctors to understand the particle beam scanning status in a timely manner, thereby improving the accuracy and efficiency of treatment. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] In the attached diagram: Figure 1 This is a structural block diagram of a beam scan path display system for particle beam therapy according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the beam spot position on the detection electrode of the ionization chamber when a particle beam irradiates the ionization chamber, according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram illustrating the steps of a method for displaying the beam spot scanning path in particle beam therapy according to an embodiment of the present invention. Detailed Implementation

[0019] 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. 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. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings 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.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0022] Please see Figure 1 and Figure 2 This invention proposes a display system and method for the beam spot scanning path in particle beam therapy, which can be applied to the field of radiotherapy technology that uses proton, heavy ion, and other particle beams to precisely irradiate tumors. This invention can acquire particle beam scanning data in real time and intuitively display the scanning path status of the beam spot, enabling doctors to understand the particle beam scanning situation in a timely manner, thereby improving the accuracy and efficiency of treatment. Detailed descriptions are provided below through specific embodiments.

[0023] Please see Figure 1In one embodiment of the present invention, a display system for beam spot scanning path of particle beam therapy is proposed, which may include a detection device, a processing device 30 and a display device 40.

[0024] Specifically, the detection device is used to collect multiple sets of voltage signals from the particle beam during the scanning process at preset fixed time intervals. Among them, one set of voltage signals is collected at the same time.

[0025] In one embodiment of the present invention, the detection device may include an ionization chamber 10 and an electrometer 20.

[0026] Specifically, the ionization chamber 10 adopts a parallel plate multi-layer strip ionization chamber structure, which contains multiple metal strips as detection electrodes. The effective area is 300mm×300mm to 400mm×400mm, and the thickness is 5mm to 10mm. It contains 64 to 128 metal strip electrodes. When a particle beam passes through the ionization chamber 10, all detection electrodes sense and collect a charge proportional to the beam intensity, thereby generating a corresponding charge signal. The ionization chamber 10 transmits the charge signals collected by all detection electrodes to the connected electrometer 20 through its internal channel.

[0027] Specifically, the electrometer 20 collects and processes the received charge signals. The collection process occurs at preset fixed time intervals, with one collection cycle lasting on the order of microseconds, to achieve real-time acquisition. The electrometer 20 is equipped with a high-impedance input circuit that converts the induced weak charge signals into voltage signals. To further improve measurement sensitivity, the electrometer incorporates a high-gain amplifier, such as an LF351 amplifier circuit. This amplifier amplifies the converted weak voltage signal to a range that can be accurately measured through a negative feedback loop. The amplified voltage signal is then converted from analog to digital and processed by the FPGA (Field-Programmable Gate Array) control unit inside the electrometer 20 to eliminate noise interference. Finally, the processed multiple sets of voltage signals are sent to the subsequent processing device 30 in digital form via a serial communication interface or Industrial Internet protocol.

[0028] Specifically, the processing device 30 receives multiple sets of voltage signals from the detection device via a communication interface. The processing device 30 calculates the corresponding instantaneous beam spot position for each received voltage signal. The processing device 30 fuses a preset number of continuously acquired instantaneous beam spot positions to calculate an effective beam spot position.

[0029] In one embodiment of the present invention, the sampling frequency of the particle beam collected by the detection device can be 40kHz to 60kHz, and the time for the detection device to collect a preset number of multiple sets of voltage signals is 100μs to 250μs.

[0030] Specifically, the preset number (corresponding to the preset number mentioned in the whole text) can be 9 to 11. This is because the particle beam is not completely irradiated at an instant, but is continuously irradiated at a certain flow intensity to a position (forming a beam spot). The irradiation time of a single beam spot is usually in the range of 100 to 300 μs.

[0031] The processing device 30 also integrates a preset number of voltage signals to calculate a relative dose value. This processing is performed on each independent voltage signal group, that is, the voltage values ​​of all detection electrode channels in a signal group are numerically integrated and summed. This integrated value is proportional to the amount of charge collected by that channel, thus reflecting the beam intensity or dose at that moment. Subsequently, the multiple integrated values ​​calculated from these preset number of signals are combined (e.g., averaged again) to finally output a comprehensive relative dose value, which characterizes the average dose level delivered by the particle beam during this time period.

[0032] The display device 40 acquires the position of each effective beam spot and its corresponding relative dose data, output sequentially over time, from the processing device 30. The display device 40 visualizes each effective beam spot position in a two-dimensional coordinate system using its coordinate values, typically represented by a graphic marker (such as a dot). Simultaneously, the display device 40 encodes the relative dose value corresponding to each position point through a visual channel, for example, by changing the color intensity, brightness, or size of the graphic marker, to intuitively reflect the relative intensity of the dose.

[0033] Specifically, the display device 40 is used to sequentially display each effective beam spot position and its corresponding relative dose in a two-dimensional coordinate system in the form of points. The horizontal and vertical axes of the two-dimensional coordinate system display the outline distribution of the effective beam spot positions, and the relative dose corresponding to each effective beam spot position is displayed through the type of color, brightness, and / or marker size.

[0034] As treatment progresses, the display device 40 sequentially plots these position points with dose information in chronological order and connects the continuous points into lines, thereby dynamically forming and displaying the path trajectory of the particle beam spot throughout the entire scanning process, i.e., the spot scanning path. This allows doctors to understand the scanning status of the particle beam in a timely manner, thereby improving the accuracy and efficiency of treatment.

[0035] Please see Figure 1 In one embodiment of the present invention, the processing device 30 is further configured to perform the following processing on each group of voltage signals: First, the electrode position corresponding to the maximum voltage signal is taken as the instantaneous beam spot center. Here, electrode position refers to its location on the metal strip electrode.

[0036] Secondly, Gaussian fitting is performed on the coordinates of the electrode positions corresponding to other voltage signals in the X direction to obtain the first normal distribution curve, and the electrode positions corresponding to the first normal distribution curve that are outside the preset probability are deleted.

[0037] Secondly, Gaussian fitting is performed on the coordinates of the electrode positions corresponding to other voltage signals in the Y direction to obtain the second normal distribution curve, and the electrode positions corresponding to the second normal distribution curve that are outside the preset probability are deleted.

[0038] Then, the instantaneous beam spot position is obtained based on the remaining electrode positions.

[0039] Specifically, the processing device 30 processes each received voltage signal to calculate the instantaneous beam spot position. First, when processing a set of voltage signals, the processing device 30 iterates through the voltage values ​​of all channels in the set and identifies the specific detection electrode corresponding to the maximum voltage signal. The physical location of this electrode is directly used as the initial position estimate of the instantaneous beam spot center at the time of acquisition, which represents the center point of the beam energy distribution.

[0040] In addition, for the instantaneous beam spot center corresponding to a set of voltage signals, the centroid method, weighted average method or interpolation method can be used to calculate the X-direction voltage signal and Y-direction voltage signal in each set of voltage signals to obtain the X-direction center position and Y-direction center position, and form the instantaneous beam spot center of the corresponding voltage signal by the X-direction center position and Y-direction center position.

[0041] Subsequently, the processing device 30 selects and processes the electrode signals from the group other than those corresponding to the electrode with the maximum value. For example... Figure 2 As shown, the processing device 30 uses the coordinate values ​​of these electrodes in the X direction and their corresponding voltage signal values ​​as input data to perform Gaussian function fitting. The charging distribution curve in the X direction, i.e., the first normal distribution curve, is obtained through the fitting algorithm, and its mathematical expectation is... and standard deviation The processing device 30 defines an effective range limit based on a preset probability range. This range limit is set to ensure that the displayed beam spot image has clear boundaries and avoids blurring of the displayed image due to the inclusion of too many edge signals. Electrode position data whose X coordinates fall outside this limit will be discarded, thus effectively removing edge signals that contribute little to the display clarity.

[0042] Similarly, the processing device performs the same processing on the coordinate data in the Y direction. For example... Figure 2 As shown, it fits the coordinates of the remaining electrodes in the Y direction with their corresponding voltage signal values ​​using a Gaussian function to obtain a second normal distribution curve, the mathematical expectation of which is... and standard deviation Based on the same consideration of display clarity, the processing device calculates the effective range limit in the Y direction and removes electrode position data that fall outside this range. This ensures that the final displayed beam spot image will not exhibit blurring due to edge signals in the Y direction.

[0043] For the Gaussian distribution, it can be calculated using numerical integration or approximation formulas. Here, we use numerical integration to calculate the definite integral, and Simpson's method is used to approximate the standard normal distribution: .

[0044] in, ， (In actual calculations, take a sufficiently small negative number). b=z,n This represents the number of segments into which the integration interval is divided.

[0045] After performing Gaussian fitting and filtering based on display clarity requirements in the X and Y directions respectively, the processing device obtains an optimized set of electrode position data. This data centrally reflects the main energy distribution area of ​​the beam, removing edge signal interference that could cause display blurring. Finally, the processing device calculates the final instantaneous beam spot position based on this optimized electrode position data, ensuring that the generated beam spot image has clear boundaries and good visual effects, facilitating accurate observation of the beam scanning path by medical personnel.

[0046] In one embodiment of the present invention, the remaining electrode positions in each group of voltage signals satisfy the following: ; ; in, This is represented by the coordinates of the remaining electrode positions in the X direction. This is represented by the coordinates of the remaining electrode positions in the Y direction. Let the standard deviation of the first normal distribution curve be denoted as . It is expressed as the mathematical expectation of the first normal distribution curve. The standard deviation of the second normal distribution curve is represented by the standard deviation of the second normal distribution curve. It is represented as the mathematical expectation of the second normal distribution curve.

[0047] Please see Figure 1 In one embodiment of the present invention, the processing device 30 is further configured to superimpose a preset number of instantaneous beam spot positions on a preset plane to fuse them into an effective beam spot position.

[0048] Specifically, the processing device 30 fuses a preset number of instantaneous beam spot positions to obtain an effective beam spot position. This preset number is usually determined based on the system sampling frequency and treatment accuracy requirements, for example, continuously acquiring 10 instantaneous beam spot positions for fusion processing. Each instantaneous beam spot position is a high-confidence two-dimensional coordinate data obtained after the aforementioned Gaussian fitting and filtering processing.

[0049] The processing device 30 performs position superposition operations on a preset two-dimensional plane coordinate system. This plane coordinate system typically corresponds to the detection plane of the ionization chamber, is measured in millimeters, and its origin is determined based on the physical structure of the ionization chamber. The processing device 30 maps each instantaneous beam spot position to this unified coordinate system in the form of its coordinate values, ensuring that all position data are processed under the same reference frame.

[0050] Please see Figure 1 In one embodiment of the present invention, the processing device 30 is further configured to perform the following processing on a preset number of multiple sets of voltage signals: First, the voltage values ​​corresponding to each group of voltage signals are integrated and summed to obtain the integral value of each group of voltage signals.

[0051] Secondly, a relative dose is obtained by weighted summation of all integral values ​​corresponding to a preset number of voltage signals.

[0052] Specifically, the processing device 30 integrates a preset number of voltage signals to calculate a relative dose value. This preset number is consistent with the number of data sets used for position fusion. The processing device 30 first performs numerical integration on each voltage signal, summing the voltage values ​​of all detection electrode channels to obtain an integral value reflecting the instantaneous dose intensity at each moment. This value is proportional to the total charge deposited by the particle beam on the ionization chamber cross-section. Subsequently, the processing device 30 performs a weighted summation of these integral values. The weighting coefficients can be determined according to an equal weighting or time decay strategy. Finally, a comprehensive relative dose value is calculated to characterize the average dose level delivered by the particle beam within that time period.

[0053] This relative dose value, as a dimensionless scalar, is not directly equivalent to the absolute dose but has a known calibration relationship. It is mainly used in the display device 40 for comparing dose intensities at different locations and for visualization encoding. Through the integration and weighted averaging process, the representativeness of the dose data is ensured, and the random fluctuations of a single acquisition are effectively smoothed out, providing stable and reliable dose intensity information for subsequent visualization and ensuring that doctors can accurately observe the dose distribution along the beam scanning path.

[0054] It is also worth mentioning that, considering the possibility of electromagnetic interference during the irradiation of the particle beam, after the processing device 30 performs Gaussian fitting to obtain the instantaneous beam spot position, abnormal instantaneous beam spot positions can be removed, thereby ensuring the accuracy of the effective beam spot position of the fusion.

[0055] In one embodiment of the present invention, the processing device 30 is further configured to perform the following processing on the instantaneous beam spot centers corresponding to a preset number of multiple sets of voltage signals: First, Gaussian fitting is performed on the coordinates of all instantaneous beam spot centers in the X direction to obtain the third normal distribution curve, and the instantaneous beam spot centers that are outside the preset probability of the third normal distribution curve are deleted. Secondly, Gaussian fitting is performed on the coordinates of all instantaneous beam spot centers in the Y direction to obtain the fourth normal distribution curve, and the instantaneous beam spot centers that are abnormal and do not correspond to the preset probability of the fourth normal distribution curve are deleted. Then, the remaining instantaneous beam spot centers are fused to obtain the effective beam spot position.

[0056] Specifically, after obtaining a preset number of instantaneous beam spot positions, the processing device 30 performs outlier removal processing on these instantaneous beam spot position data to further improve data quality. The processing device 30 first performs statistical analysis on the coordinate values ​​of all instantaneous beam spot positions in the X direction, obtaining a best-fit third normal distribution curve through a Gaussian fitting algorithm. The processing device 30 defines an effective range limit based on a preset probability range (usually set to 95%). Instantaneous beam spot positions whose X coordinate values ​​fall outside this limit are judged as outliers. These outliers may be caused by electromagnetic interference or other instantaneous interference factors during particle beam irradiation. The processing device 30 deletes these abnormal instantaneous beam spot positions from the dataset.

[0057] Similarly, the processing device 30 performs the same processing on the instantaneous beam spot position data in the Y direction.

[0058] Subsequently, the processing device 30 combines the calculated X and Y coordinates into a two-dimensional coordinate point, which serves as the effective beam spot position after fusion. This position data has higher accuracy and anti-interference capability, providing reliable position information for subsequent scanning path display.

[0059] Please see Figure 3 In one embodiment of the present invention, a method for displaying the beam spot scanning path of particle beam therapy is also proposed, comprising the following steps.

[0060] Step S10: Collect multiple sets of voltage signals of the particle beam during the scanning process according to a preset fixed time interval; wherein, one set of voltage signals is collected at the same time.

[0061] Step S20: Receive multiple sets of voltage signals from the particle beam; calculate the corresponding instantaneous beam spot position for each set of voltage signals, and fuse a preset number of instantaneous beam spot positions to obtain an effective beam spot position; perform integration processing on the preset number of multiple sets of voltage signals to obtain a relative dose.

[0062] Step S30: Visualize each effective beam spot position and its corresponding relative dose in chronological order to form a beam spot scanning path.

[0063] Therefore, as treatment progresses, these effective beam spot locations with dose information are plotted sequentially in chronological order, and the continuous effective beam spot locations are connected into a line, thereby dynamically forming and displaying the path trajectory of the particle beam spot throughout the entire scanning process, i.e., the beam spot scanning path. This allows doctors to understand the scanning status of the particle beam in a timely manner, thereby improving the accuracy and efficiency of treatment.

[0064] In summary, this invention proposes a display system and method for beam spot scanning paths in particle beam therapy. First, a detection device continuously acquires particle beam data at preset fixed time intervals, obtaining multiple sets of voltage signals during the scanning process. Second, after receiving the multiple sets of voltage signals, a processing device calculates the corresponding instantaneous beam spot position for each set of voltage signals and merges a preset number of instantaneous beam spot positions into one effective beam spot position, corresponding to one beam spot. The preset number of voltage signals are also integrated to obtain the relative dose corresponding to one beam spot. Finally, the display device sequentially visualizes each effective beam spot position and its corresponding relative dose in chronological order to form a beam spot scanning path. This invention allows physicians to understand the particle beam scanning status in a timely manner, thereby improving the accuracy and efficiency of treatment.

[0065] 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.

Claims

1. A display system for beam spot scanning path in particle beam therapy, characterized in that, include: The detection device is used to collect multiple sets of voltage signals of the particle beam during the scanning process at preset fixed time intervals; wherein, one set of voltage signals is collected at the same time. Processing device for receiving multiple sets of voltage signals from the particle beam; The processing device is also used to calculate the corresponding instantaneous beam spot position for each group of voltage signals, and to fuse a preset number of instantaneous beam spot positions to obtain an effective beam spot position; and to perform integration processing on a preset number of multiple groups of voltage signals to obtain a relative dose; The display device is used to visualize each effective beam spot position and its corresponding relative dose in chronological order to form a beam spot scanning path.

2. The display system for beam spot scanning path in particle beam therapy according to claim 1, characterized in that, The detection device includes: The ionization chamber has multiple detection electrodes, all of which generate corresponding charge signals when they receive a particle beam. An electrometer, connected to all detection electrodes, is used to convert received charge signals into multiple sets of corresponding voltage signals at preset fixed time intervals.

3. The display system for beam spot scanning path in particle beam therapy according to claim 1, characterized in that, The processing device is also used to perform the following processing on each group of voltage signals: The electrode position corresponding to the maximum voltage signal is taken as the instantaneous beam spot center; Gaussian fitting is performed on the coordinates of the electrode positions corresponding to other voltage signals in the X direction to obtain the first normal distribution curve, and the electrode positions corresponding to the first normal distribution curve that are outside the preset probability are deleted. Gaussian fitting is performed on the coordinates of the electrode positions corresponding to other voltage signals in the Y direction to obtain the second normal distribution curve, and the electrode positions corresponding to the second normal distribution curve that are outside the preset probability are deleted. The instantaneous beam spot position is obtained based on the remaining electrode positions.

4. The display system for beam spot scanning path in particle beam therapy according to claim 3, characterized in that, The remaining electrode positions in each voltage signal group satisfy the following: ； ； in, This is represented by the coordinates of the remaining electrode positions in the X direction. This is represented by the coordinates of the remaining electrode positions in the Y direction. Let the standard deviation of the first normal distribution curve be denoted as . It is expressed as the mathematical expectation of the first normal distribution curve. The standard deviation of the second normal distribution curve is represented by the standard deviation of the second normal distribution curve. It is represented as the mathematical expectation of the second normal distribution curve.

5. The display system for beam spot scanning path in particle beam therapy according to claim 3, characterized in that, The processing device is also used to superimpose a preset number of instantaneous beam spot positions on a preset plane to fuse them into an effective beam spot position.

6. The display system for beam spot scanning path in particle beam therapy according to claim 1, characterized in that, The processing device is also used to perform the following processing on a preset number of multiple sets of voltage signals: Integrate and sum the voltage values ​​corresponding to each group of voltage signals to obtain the integral value of each group of voltage signals; A relative dose is obtained by weighted summation of all integral values ​​corresponding to a preset number of voltage signals.

7. The display system for beam spot scanning path in particle beam therapy according to claim 1, characterized in that, The display device is used to sequentially display each effective beam spot position and its corresponding relative dose in a two-dimensional coordinate system in the form of points; wherein, the horizontal and vertical coordinates of the two-dimensional coordinate system display the outline distribution of the effective beam spot positions, and the relative dose corresponding to each effective beam spot position is displayed by the type of color, brightness and / or marker size.

8. The display system for beam spot scanning path in particle beam therapy according to claim 1, characterized in that, The multi-electrode ionization chamber is a parallel plate-strip ionization chamber with an effective area of ​​300mm×300mm~400mm×400mm and a thickness of 5mm~10mm. It contains 64~128 metal strip electrodes.

9. The display system for beam spot scanning path in particle beam therapy according to claim 1, characterized in that, The sampling frequency of the particle beam collected by the detection device is 40kHz to 60kHz, and the time for the detection device to collect multiple sets of voltage signals of a preset number is 100μs to 250μs.

10. A method for displaying the beam spot scanning path in particle beam therapy, characterized in that, include: Multiple sets of voltage signals of the particle beam during the scanning process are collected at preset fixed time intervals; among them, one set of voltage signals is collected at the same time. The system receives multiple sets of voltage signals from the particle beam; calculates the corresponding instantaneous beam spot position for each set of voltage signals, and fuses a preset number of instantaneous beam spot positions to obtain an effective beam spot position; and integrates the preset number of multiple sets of voltage signals to obtain a relative dose. In chronological order, each effective beam spot location and its corresponding relative dose are visualized to form a beam spot scanning path.

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