CN109289129B - Quality control method and device for linear accelerator - Google Patents
Quality control method and device for linear accelerator Download PDFInfo
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- CN109289129B CN109289129B CN201811042315.7A CN201811042315A CN109289129B CN 109289129 B CN109289129 B CN 109289129B CN 201811042315 A CN201811042315 A CN 201811042315A CN 109289129 B CN109289129 B CN 109289129B
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Abstract
The embodiment of the invention discloses a quality control method and a quality control device of a linear accelerator, wherein the method comprises the following steps: acquiring an output error of the linear accelerator; according to the output error of the linear accelerator in a first monitoring period, obtaining quality evaluation information of the linear accelerator in the first monitoring period; according to the output error of the linear accelerator in the second monitoring period, obtaining the quality evaluation information of the linear accelerator in the second monitoring period; and if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value, outputting a first warning prompt. By implementing the embodiment of the invention, the quality problem of the linear accelerator can be found before the error exceeds the acceptable range, and the potential safety hazard and medical accidents in the medical treatment process are eliminated.
Description
Technical Field
The embodiment of the invention relates to the technical field of medical equipment, in particular to a quality control method and device of a linear accelerator.
Background
A high-frequency linear accelerator (referred to as a linear accelerator for short) refers to a device for accelerating charged particles by using a high-frequency electric field distributed along a linear track, and obtains higher energy by using interaction between high-energy electrons (the speed reaches a sub-light speed) with certain energy and a microwave electric field of high-power microwaves. The electrons are directly led out and can be used for electron beam therapy. The electrons strike the heavy metal target to generate bremsstrahlung radiation, and X rays are emitted for X-ray treatment.
Current medical care management personnel can gather linear accelerator's output error data, carry out quality inspection to linear accelerator to avoid performance unsatisfactory linear accelerator to carry out the radiotherapy to patient. However, the current quality control work only evaluates the quality of the linear accelerator according to a single output error, and often the performance of the linear accelerator can be known to be problematic after the error exceeds an acceptable range, thereby causing potential safety hazards and even medical accidents in the medical process.
Disclosure of Invention
The invention provides a quality control method and a quality control device for a linear accelerator, which aim to solve the quality problem of the linear accelerator before an error exceeds an acceptable range and eliminate potential safety hazards and medical accidents in a medical process.
In a first aspect, an embodiment of the present invention provides a quality control method for a linear accelerator, including:
acquiring an output error of the linear accelerator;
according to the output error of the linear accelerator in a first monitoring period, obtaining quality evaluation information of the linear accelerator in the first monitoring period;
according to the output error of the linear accelerator in the second monitoring period, obtaining the quality evaluation information of the linear accelerator in the second monitoring period;
and if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value, outputting a first warning prompt.
Further, still include: and if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value, increasing the frequency of acquiring the output error in the next monitoring period.
Optionally, the output error comprises a dose output error and a calibration error, each as a different form of output error to independently obtain quality assessment information.
Further, the acquiring an output error of the linear accelerator specifically includes:
acquiring an output dose standard value and an actual output dose value of the linear accelerator;
and calculating the difference value between the standard output dose value and the actual output dose value as a dose output error.
Further, the acquiring the output dose standard value of the linear accelerator comprises:
reading a film image;
identifying an irregular shot in the film image;
according to the perimeter and the area of the irregular portal, adopting a preset conversion algorithm to obtain the side length of an equivalent regular square field corresponding to the irregular portal;
and calculating the standard value of the output dose according to the side length of the equivalent square field.
Further, still include:
confirming that the output error of the linear accelerator in the third monitoring period belongs to a system error or a random error according to the distribution function of the output error of the linear accelerator in the third monitoring period;
and if the output error belongs to the system error, outputting a second alarm prompt.
Further, still include:
confirming the corresponding relation between the linear accelerator and the radiotherapy part according to the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information of the linear accelerator in the second monitoring period;
and updating an accelerator database according to the corresponding relation between the linear accelerator and the radiotherapy part, wherein the accelerator database stores a plurality of table entries, each table entry comprises identification information of one linear accelerator and identification information of the corresponding radiotherapy part, the accelerator database is used for outputting the identification information of the linear accelerator corresponding to the appointed radiotherapy part for selection by a user when receiving a database calling instruction, and the database calling instruction carries the identification information of the appointed radiotherapy part.
Further, the number of entries in the accelerator database is a fixed value.
In a second aspect, an embodiment of the present invention provides a quality control apparatus for a linear accelerator, including:
the acquisition module is used for acquiring the output error of the linear accelerator;
the first evaluation module is used for obtaining quality evaluation information of the linear accelerator in a first monitoring time period according to the output error of the linear accelerator in the first monitoring time period;
the second evaluation module is used for obtaining quality evaluation information of the linear accelerator in a second monitoring time period according to the output error of the linear accelerator in the second monitoring time period;
and the first warning module is used for outputting a first warning prompt if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value.
Further, still include:
and the frequency adjusting module is used for increasing the frequency of acquiring the output error in the next monitoring period if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value.
The embodiment of the invention has the following beneficial effects:
according to the technical scheme of the embodiment of the invention, in the process of using the linear accelerator, the output error of the linear accelerator is obtained, the quality evaluation information of different monitoring time periods is obtained according to the error in the different monitoring time periods, whether the performance of the linear accelerator is stable or not can be known by calculating the difference value between the quality evaluation information of the different monitoring time periods, when the performance of the linear accelerator has larger fluctuation, the alarm information can be output, the problem that the quality of the linear accelerator is found when the error of the linear accelerator floats to be beyond an acceptable range is avoided, the effect of finding the quality problem of the linear accelerator in time is realized, and the potential safety hazard and medical accidents in the medical process are eliminated.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a flowchart of a quality control method for a linear accelerator according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a setting window of an output error according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a first output error analysis according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a second output error analysis in accordance with a first embodiment of the present invention;
FIG. 5 is a schematic diagram of a third output error analysis according to a first embodiment of the present invention;
FIG. 6 is a schematic diagram of a fourth output error analysis according to a first embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating the calculation of the equivalent area of the irregular radiation field in the embodiment of the present invention;
fig. 8 is a schematic structural diagram of a quality control device of a linear accelerator according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are for purposes of illustration and not limitation. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a quality control method for a linear accelerator according to an embodiment of the present invention. The method can be executed by a terminal of a quality control device integrated with a linear accelerator. The method comprises the following steps:
wherein the output error can take a variety of forms, such as a dose output error and a calibration error, wherein the calibration error can include errors in one or more of the following calibration items: the system comprises a frame angle indication device, a light field '+' word line stability device, a collimator angle device, a laser lamp precision device, a light range ruler, a light field radiation field consistency device, a light field MLC in-place precision device, a treatment bed rotation angle device, a treatment bed translation precision device, a radiation field MLC in-place precision device, a radiation field lead door in-place precision device, a radiation field flatness device, a radiation field symmetry device, a ray energy device, a collimator and the like. When the terminal of the quality control device integrated with the linear accelerator is in communication connection with the linear accelerator, the actual output parameters in the operation process of the linear accelerator can be obtained; when the terminal is connected with the input device of the linear accelerator, the setting parameters input by medical care management personnel through the input device in advance before the medical care management personnel use the linear accelerator can be obtained. The difference between the set parameter and the actual output parameter is the output error. It should be noted that the input device of the linac may be integrated into the linac, or may be an external terminal, such as a mobile phone. An application program capable of running on the mobile phone is designed, the mobile phone is communicated with the linear accelerator through a wireless network, parameters can be input on the application program of the mobile phone, and the use convenience is improved.
specifically, the output error may be directly used as the quality evaluation information, or the quality evaluation information may be obtained by performing calculation on the output error. Simply, for example, the mean, variance or other statistical parameters of the output error may be used as the quality evaluation information, or the error may be input into a pre-designed data model, the model outputs a quality evaluation score, and the score is used as the quality evaluation parameter, and a higher score indicates that the error in the monitoring period is more stable or more fluctuating; but also a pattern or sequence corresponding to the output error, e.g. an error trend map, etc. Note that, a monitoring period may use the linac multiple times, and obtain errors using multiple dimensions, respectively, to obtain output error sets at multiple time points, where each output error set includes errors in multiple dimensions. The output errors of the same dimension at different time points in the monitoring time period can correspondingly obtain one piece of quality evaluation information, so that a plurality of pieces of quality evaluation information exist in the monitoring time period, one piece of quality evaluation information can also be obtained by utilizing the output errors of all the dimensions at all the time points, and the quality of the accelerator in the monitoring time period is evaluated totally.
And 140, outputting a first alarm prompt if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value.
Specifically, if the quality-evaluation information is in numerical form, the difference value may be an absolute value of a difference between the quality-evaluation information of the two monitoring periods. If the quality evaluation information is in the form of a graph, the difference value may be a parameter for measuring the difference between two graphs, such as a distance value (euclidean distance or dynamic warping distance, etc.) between sequences respectively included in the two graphs. In specific implementation, the difference value and the threshold value can be specifically defined according to the form of the quality evaluation information. And when the difference value is larger than the threshold value, outputting a first alarm prompt to attract the attention of the user.
The principle of the quality control method of the linear accelerator according to the present embodiment will be described in detail with reference to fig. 2 to 6. FIG. 2 is a schematic diagram of a setting window of an output error; fig. 3 to 6 are schematic diagrams illustrating analysis of a plurality of output errors.
As shown in fig. 2, the linear accelerator may have a plurality of evaluation items, an error allowable threshold for each evaluation item may be set in advance, and a detection frequency.
After the output error of the linear accelerator is obtained, the error can be analyzed in various forms, such as obtaining a trend analysis chart or outputting a dose stability analysis chart. These graphs allow retrospective and prospective analysis of the data. Retrospective analysis included:
(1) trend analysis, as shown in fig. 3, can see the trend of a certain accelerator performance index.
(2) Stability analysis, as shown in FIG. 4, with the error range on the horizontal axis of the histogram of FIG. 4, multiple steps can be positioned, e.g., 1 step representing error ≦ 2%, 2 step representing error ≦ -2% ≦ 1.75%, 3 step representing error ≦ -1.75 ≦ 1.5% … …, and so on, 16 step representing 1.5% error ≦ 1.75%, 17 step representing error ≦ 1.75% 2%, and 18 step representing error > 2%. The number of times of occurrence of errors corresponding to the error rank on the vertical axis can be used to analyze whether the accelerator error is a systematic error or a random error, because if the error is a random error, the distribution of the errors should be uniform in positive and negative directions, the histogram should be in a normal distribution, and if the error is a systematic error, the error range should be higher in a certain direction.
Other statistical figures such as pie charts may also be used for analysis.
Through performance analysis of the same linear accelerator at different periods, the variation of the performance of the accelerator can be clearly seen, for example, the condition of 1-6 months in the year and the condition of 1-6 months before 3 years can be compared, if the variation is not obvious, the performance of the accelerator is not obviously attenuated, and the accelerator can be used for executing radiotherapy plans with high precision, such as radiotherapy of the head. Some thoracoabdominal or conventional radiotherapy is often done on accelerators that are at risk of performance decay. Figure 5 shows accelerator dose delivery error trend analysis for different time periods.
The prospective analysis is to predict the current performance index of the accelerator. It is based on the statistics of the last three years of accelerator, as shown in fig. 6, the predicted result of each ray includes the last time to adjust the accelerator dosage, the adjusted deviation, the last measured time, and the last measured deviation (since the last adjustment date is not necessarily the last measurement date, for example, 10 month 2, the accelerator is adjusted because it exceeds the allowable limit of dosage scale error, the adjustment date is 10 month 2, and in 10 month 9, the medical care manager measures the dosage, and because the deviation is small and there is no adjustment, the last measurement date is 10 month 9, and these two parameters can be used as the reference for predicting the most current values), so that the medical care manager can deduce various possible changes and possible change results, and know what quality control needs to be done immediately, the timeliness of finding problems and the pertinence of quality control are ensured.
The analysis results and the images may be stored in a database for subsequent statistical analysis and querying, respectively.
In summary, according to the technical scheme of the first embodiment of the present invention, in the process of using the linear accelerator, the output error of the linear accelerator is obtained, the quality evaluation information of different monitoring periods is obtained according to the error in different monitoring periods, and by calculating the difference between the quality evaluation information of different monitoring periods, it is possible to know whether the performance of the linear accelerator is stable, and when the performance of the linear accelerator has a large fluctuation, the warning information may be output, so that the quality problem of the linear accelerator is not found until the error of the linear accelerator floats beyond an acceptable range, an effect of finding the quality problem of the linear accelerator in time is achieved, and the potential safety hazard and medical accidents in the medical process are eliminated.
On the basis of the above embodiment, further, the quality control method may further include:
and if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value, increasing the frequency of acquiring the output error in the next monitoring period.
From fig. 5 we can see that the sampling frequency for the output error can be different for different monitoring periods. When the error is larger than the preset threshold value, the linear accelerator can be considered to have quality fluctuation, and by increasing the sampling frequency of the next monitoring period, a more accurate evaluation result can be obtained later, so that the evaluation accuracy of the linear accelerator is improved.
On the basis of the foregoing embodiment, further, the step 110 of obtaining the output error of the linear accelerator may further specifically include:
acquiring an output dose standard value and an actual output dose value of the linear accelerator;
and calculating the difference value between the standard output dose value and the actual output dose value as a dose output error.
Further, the acquiring the output dose standard value of the linear accelerator comprises:
reading a film image;
identifying an irregular shot in the film image;
according to the perimeter and the area of the irregular portal, adopting a preset conversion algorithm to obtain the side length of an equivalent regular square field corresponding to the irregular portal;
and calculating the standard value of the output dose according to the side length of the equivalent square field.
FIG. 7 is a schematic diagram of the calculation of the equivalent area of the irregular radiation field. The dose calculation of the linear accelerator usually needs to equate the irregular radiation field to a regular square field, in the prior art, only manual estimation can be carried out, in order to improve the precision of the dose calculation, the embodiment of the invention can automatically calculate through a calculation program of a terminal, the terminal integrated with a quality control device can allow a user to input information to obtain a film image, firstly, an image source is defined, then, the corresponding relation between a unit pixel and the actual length in the image is set, then, the film image is displayed, the user can specify the range of the irregular radiation field through a mouse, the circumference and the area of the radiation field are automatically calculated by a system, and then, the side length of the equivalent square field is obtained through an area circumference ratio method. After equivalence, a standard value of the output dose can be calculated according to the existing algorithm.
On the basis of the above embodiment, further, the quality control method further includes:
confirming that the output error of the linear accelerator in the third monitoring period belongs to a system error or a random error according to the distribution function of the output error of the linear accelerator in the third monitoring period;
and if the output error belongs to the system error, outputting a second alarm prompt.
In particular, the third monitoring period may be any monitoring period, such as the first monitoring period or the second detection period. As mentioned above, the difference value of the quality evaluation information between the two monitoring time periods can show whether the quality of the linear accelerator fluctuates, so that problems can be found early, a first warning prompt is output, manual intervention is introduced, and medical hidden dangers or accidents are avoided. And when the accelerator is used for a short time, the output of a single monitoring period can be analyzed, for example, a distribution function is obtained, whether the error belongs to a system error or a random error can be known through the distribution function, if the error is the system error, a problem possibly occurs in a certain hardware component of the linear accelerator instead of performance fluctuation caused by simple aging is shown, and a second alarm prompt is output, so that a maintenance worker can maintain and maintain the accelerator early.
On the basis of the above embodiment, further, the quality control method further includes:
confirming the corresponding relation between the linear accelerator and the radiotherapy part according to the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information of the linear accelerator in the second monitoring period;
and updating an accelerator database according to the corresponding relation between the linear accelerator and the radiotherapy part, wherein the accelerator database stores a plurality of table entries, each table entry comprises identification information of one linear accelerator and identification information of the corresponding radiotherapy part, the accelerator database is used for outputting the identification information of the linear accelerator corresponding to the appointed radiotherapy part for selection by a user when receiving a database calling instruction, and the database calling instruction carries the identification information of the appointed radiotherapy part.
In this further aspect, the correspondence relationship between the linac and the radiotherapy site can be confirmed according to the mass fluctuation of the linac. As previously mentioned, if the linac mass change is not significant, indicating that there is no significant attenuation in the performance of the accelerator, such an accelerator may be allowed to perform some radiotherapy plan that requires high accuracy, such as head radiotherapy. Some thoracoabdominal or conventional radiotherapy is done on accelerators that are at risk of performance decay. The corresponding relation between the linear accelerator and the radiotherapy part can be managed through the setting of the accelerator database, a user can select a proper linear accelerator through the quality control device, for example, the user can select the radiotherapy part, the linear accelerator suitable for the radiotherapy part is inquired through calling the database, and when the database receives a database calling instruction, the identification information of the corresponding linear accelerator is output to be selected by the user.
The design of the accelerator database enables the quality control device of the linear accelerator to perform quality control on a plurality of linear accelerators, and the information of the plurality of linear accelerators is recorded in different table entries in the database respectively.
On the basis of the above embodiment, further, the number of entries in the accelerator database is a fixed value. Since the linear accelerator is applied to the medical field and the security of the linear accelerator needs to be considered seriously, in the embodiment of the present invention, the number of the entries in the accelerator database may be preferably set to a fixed value, that is, the linear accelerator is not allowed to be added or deleted, so as to limit the operation authority of the medical care administrator. For example, 8 linacs are preset in the database for selection by a user, the user cannot perform increased operation and delete accelerator, and only can modify the accelerator, if the hospital does not have such linacs, the available state of the corresponding accelerator can be changed to be not, each linac has multiple electron beam energies, and basically covers all the existing electron beam energies which may occur, and if some electron beams are not available to the linac, the user does not need to take care of the accelerator, and only needs to operate the existing electron beam energies. In addition, because the parameters input for X-ray and electron beam dose calculations are different, if one linac includes X-rays and electron beams, it will be treated as two linac definitions, i.e., two entries in the accelerator database are occupied. When the linear accelerator is selected, the device can automatically call different display windows according to the fact that the linear accelerator is an X line or an electron line, a user can set parameters, and the device is connected with the linear accelerator and can control the output of the linear accelerator. Obviously, the quality control device can be used for realizing the quality control of the linear accelerator and also can be used as a control and management device of the linear accelerator. Further, the information of the patient can be input into the device, and the use management of the linear accelerator is realized.
As previously mentioned, the error for the linear accelerator may be sampled according to different frequencies. If the quality control is not carried out according to the specified detection frequency, the document can be additionally recorded. However, the recorded data can be automatically identified by the quality control device, and only the actually measured data can be considered without considering during statistical analysis, so that the accuracy of data analysis is ensured.
Fig. 8 is a schematic structural diagram of a quality control device of a linear accelerator according to a second embodiment of the present invention, including:
an obtaining module 810, configured to obtain an output error of the linear accelerator;
the first evaluation module 820 is used for obtaining quality evaluation information of the linear accelerator in a first monitoring time period according to an output error of the linear accelerator in the first monitoring time period;
the second evaluation module 830 is configured to obtain quality evaluation information of the linear accelerator in a second monitoring period according to an output error of the linear accelerator in the second monitoring period;
the first warning module 840 is configured to output a first warning prompt if a difference between the quality evaluation information of the linac in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold.
Further, still include:
and the frequency adjusting module is used for increasing the frequency of acquiring the output error in the next monitoring period if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value.
The output errors include dose output errors and calibration errors, which are respectively used as output errors of different forms to independently obtain quality evaluation information.
Further, the obtaining module 810 specifically includes:
the dose value acquisition unit is used for acquiring an output dose standard value and an actual output dose value of the linear accelerator;
and the error calculation unit is used for calculating the difference value between the output dose standard value and the actual output dose value as a dose output error.
Further, the dose value acquiring unit includes:
a reading subunit for reading the film image;
an identifying subunit, configured to identify an irregular shot in the film image;
the conversion subunit is used for obtaining the side length of the equivalent regular square field corresponding to the irregular portal by adopting a preset conversion algorithm according to the perimeter and the area of the irregular portal;
and the calculating subunit is used for calculating the standard value of the output dose according to the side length of the equivalent square field.
Further, the quality control device of the linear accelerator further comprises:
the type confirming module is used for confirming that the output error of the linear accelerator in the third monitoring period belongs to a system error or a random error according to the distribution function of the output error of the linear accelerator in the third monitoring period;
and the second alarm module is used for outputting a second alarm prompt if the output error belongs to the system error.
Further, the quality control device of the linear accelerator further comprises:
the corresponding relation confirming module is used for confirming the corresponding relation between the linear accelerator and the radiotherapy part according to the difference value between the quality evaluation information of the linear accelerator in the first monitoring time period and the quality evaluation information of the linear accelerator in the second monitoring time period;
and the database updating module is used for updating an accelerator database according to the corresponding relation between the linear accelerator and the radiotherapy part, wherein the accelerator database stores a plurality of table entries, each table entry comprises identification information of one linear accelerator and identification information of the corresponding radiotherapy part, the accelerator database is used for outputting the identification information of the linear accelerator corresponding to the appointed radiotherapy part for selection by a user when receiving a database calling instruction, and the database calling instruction carries the identification information of the appointed radiotherapy part.
Further, the number of entries in the accelerator database is a fixed value.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method according to any of the above embodiments.
In this embodiment, if the module/unit integrated with the quality control device of the linear accelerator is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The embodiment of the present invention further provides a terminal, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor executes the computer program to implement the steps in the quality control method embodiments, such as step 110 shown in fig. 1, to obtain an output error of a linear accelerator; step 120, obtaining quality evaluation information of the linear accelerator in a first monitoring time period according to an output error of the linear accelerator in the first monitoring time period; step 130, obtaining quality evaluation information of the linear accelerator in a second monitoring time period according to the output error of the linear accelerator in the second monitoring time period; and 140, outputting a first alarm prompt if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value. . Alternatively, the processor implements the functions of the modules/units in the embodiments of the base station opening apparatus described above when executing the computer program, for example, the obtaining module 810, the first evaluating module 820, the second evaluating module 830, and the first warning module 840 shown in fig. 8.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the corresponding base station open station device.
The terminal may include, but is not limited to, a processor, a memory. It will be appreciated by a person skilled in the art that the terminal is not limiting and may comprise more or less components than the examples described above, or some components in combination, or different components, e.g. the terminal may further comprise input output devices, network access devices, buses etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like that is the control center for the device and that connects the various parts of the overall device using various interfaces and lines.
The memory may be used to store the computer programs and/or modules, and the processor may implement the various functions of the apparatus by running or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating device, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
In the embodiments of the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the unit or unit is only one type of logical function division, and there may be other division manners in actual implementation, for example, a plurality of units or components may be combined or integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical or other form.
Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A quality control method of a linear accelerator is characterized by comprising the following steps:
acquiring an output error of the linear accelerator;
according to the output error of the linear accelerator in a first monitoring period, obtaining quality evaluation information of the linear accelerator in the first monitoring period;
according to the output error of the linear accelerator in the second monitoring period, obtaining the quality evaluation information of the linear accelerator in the second monitoring period;
and if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value, outputting a first warning prompt.
2. The method of claim 1, further comprising: and if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value, increasing the frequency of acquiring the output error in the next monitoring period.
3. The method of claim 1, wherein the output error includes a dose output error and a calibration error, each as a different form of output error to independently obtain quality evaluation information.
4. The quality control method of the linear accelerator according to claim 3, wherein the obtaining of the output error of the linear accelerator specifically comprises:
acquiring an output dose standard value and an actual output dose value of the linear accelerator;
and calculating the difference value between the standard output dose value and the actual output dose value as a dose output error.
5. The quality control method of the linear accelerator according to claim 4, wherein the obtaining of the standard value of the output dose of the linear accelerator comprises:
reading a film image;
identifying an irregular shot in the film image;
according to the perimeter and the area of the irregular portal, adopting a preset conversion algorithm to obtain the side length of an equivalent regular square field corresponding to the irregular portal;
and calculating the standard value of the output dose according to the side length of the equivalent square field.
6. The method of claim 1, further comprising:
confirming that the output error of the linear accelerator in the third monitoring period belongs to a system error or a random error according to the distribution function of the output error of the linear accelerator in the third monitoring period;
and if the output error belongs to the system error, outputting a second alarm prompt.
7. The method of claim 1, further comprising:
confirming the corresponding relation between the linear accelerator and the radiotherapy part according to the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information of the linear accelerator in the second monitoring period;
and updating an accelerator database according to the corresponding relation between the linear accelerator and the radiotherapy part, wherein the accelerator database stores a plurality of table entries, each table entry comprises identification information of one linear accelerator and identification information of the corresponding radiotherapy part, the accelerator database is used for outputting the identification information of the linear accelerator corresponding to the appointed radiotherapy part for selection by a user when receiving a database calling instruction, and the database calling instruction carries the identification information of the appointed radiotherapy part.
8. The method of claim 6, wherein the number of entries in the accelerator database is a fixed value.
9. A quality control device of a linear accelerator, comprising:
the acquisition module is used for acquiring the output error of the linear accelerator;
the first evaluation module is used for obtaining quality evaluation information of the linear accelerator in a first monitoring time period according to the output error of the linear accelerator in the first monitoring time period;
the second evaluation module is used for obtaining quality evaluation information of the linear accelerator in a second monitoring time period according to the output error of the linear accelerator in the second monitoring time period;
and the first warning module is used for outputting a first warning prompt if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value.
10. The quality control apparatus of a linear accelerator according to claim 9, further comprising:
and the frequency adjusting module is used for increasing the frequency of acquiring the output error in the next monitoring period if the difference value between the quality evaluation information of the linear accelerator in the first monitoring period and the quality evaluation information in the second monitoring period is greater than a preset threshold value.
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| CN108434612A (en) * | 2018-01-05 | 2018-08-24 | 沈阳东软医疗系统有限公司 | A kind of QAT quality assurance test method and device |
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| CN108434612A (en) * | 2018-01-05 | 2018-08-24 | 沈阳东软医疗系统有限公司 | A kind of QAT quality assurance test method and device |
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