CN109363702B - Medical imaging method and system and radiation dose acquisition method and system - Google Patents
Medical imaging method and system and radiation dose acquisition method and system Download PDFInfo
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Abstract
The embodiment of the invention provides a medical imaging method and system and a radiation dose acquisition method and system. The respiratory device controls the respiratory frequency and the respiratory amplitude of the detected object so that the detected object breathes according to the set respiratory frequency and the set respiratory amplitude, the set respiratory amplitude is smaller than the designated amplitude, the detected object is scanned in the process of breathing according to the set respiratory frequency and the set respiratory amplitude to obtain a scanned image, a reconstructed image is obtained according to the scanned image, the respiratory amplitude of the detected object in the scanning process is controlled to be lower than a certain degree, and artifacts in the scanned image are weakened.
Description
[ technical field ] A method for producing a semiconductor device
The scheme relates to the technical field of medical treatment, in particular to a medical imaging method and system and a radiation dose obtaining method and system.
[ background of the invention ]
Medical imaging refers to scanning a specified part of a detected object by using a medical imaging device, and then reconstructing a medical image meaningful for diagnosis/treatment according to a scanning result. Medical imaging technology has become an important auxiliary diagnostic/therapeutic means, and is widely applied.
The image quality of medical images is important for the impact of diagnosis/treatment. The medical image with high quality can provide accurate data for doctors, thereby being beneficial to the doctors to make accurate diagnosis and achieve better treatment effect. Medical images of poor quality do not have a large reference value and are generally discarded.
During scanning of an object to be examined by using medical imaging equipment such as CT (Computed Tomography), PET (Positron Emission Tomography), RT (radio Tomography), and the like, the object to be examined cannot hold breath all the time, and thus, respiratory movement causes displacement of the body such as internal organs of the object to be examined, and the like, which causes artifacts in the scanned image, and reduces image quality. Also, the larger the breathing amplitude, the more severe the artifact. In the medical scanning imaging process in the prior art, the respiratory amplitude of a detected object is too large, so that serious motion artifacts are caused, and the image quality is poor.
[ summary of the invention ]
In view of this, the embodiment of the present disclosure provides a medical imaging method and system and a radiation dose obtaining method and system, so as to solve the problem in the prior art that a respiratory amplitude of a subject is too large in a medical scanning imaging process, which causes a serious motion artifact and results in poor image quality.
In a first aspect, an embodiment of the present invention provides a medical imaging method, where the method includes:
before scanning, controlling the respiratory frequency and the respiratory amplitude of a detected object through respiratory equipment so that the detected object can breathe according to a set respiratory frequency and a set respiratory amplitude, wherein the set respiratory amplitude is smaller than a designated amplitude;
scanning the detected object to obtain a scanning image in the process that the detected object breathes according to the set breathing frequency and the set breathing amplitude;
and obtaining a reconstructed image according to the scanning image.
As with the above-described aspects and any possible implementations, there is further provided an implementation, where the method further includes:
collecting a respiratory signal of the detected object in a scanning process;
obtaining a reconstructed image from the scan image, comprising: selecting an image to be reconstructed from the scanned image according to the respiratory signal; and carrying out reconstruction processing on the image to be reconstructed to obtain the reconstructed image.
The above-mentioned aspect and any possible implementation manner further provide an implementation manner, wherein selecting an image to be reconstructed from the scan images according to the respiratory signal includes:
searching a time period of which the corresponding respiration amplitude is larger than a set respiration amplitude in the respiration signal as a marked time period; and deleting the images of which the corresponding scanning time is within the marking time period from the scanned images, and selecting the residual images as the images to be reconstructed.
The above aspect and any possible implementation manner further provide an implementation manner, where before the image to be reconstructed is reconstructed to obtain the reconstructed image, the method further includes:
according to the respiration signal, respiratory motion correction is carried out on the image to be reconstructed to obtain a corrected image;
reconstructing the image to be reconstructed to obtain the reconstructed image, wherein the reconstructing comprises: and reconstructing the corrected image to obtain the reconstructed image.
As with the above-described aspects and any possible implementations, there is further provided an implementation, where the method further includes:
during the scanning process, monitoring the actual respiratory amplitude of the detected object;
when the actual respiratory amplitude is larger than the designated amplitude, adjusting the respiratory frequency of the detected object through the respiratory equipment so as to enable the actual respiratory amplitude of the detected object to be smaller than the designated amplitude.
In a second aspect, embodiments of the present invention provide a medical imaging system, which includes a processor and a memory; the memory is for storing instructions that, when executed by the processor, cause the system to implement the method of any one of the first aspects.
In a third aspect, an embodiment of the present invention provides a method for acquiring a radiation dose, where the method includes:
before treatment, controlling the respiratory frequency and the respiratory amplitude of a treatment object through respiratory equipment so that the treatment object breathes according to a set respiratory frequency and a set respiratory amplitude, wherein the set respiratory amplitude is smaller than a designated amplitude;
selecting a target area according to the set breathing amplitude in the process that the treatment object breathes according to the set breathing frequency and the set breathing amplitude;
and determining the radiation dose for radiating the target area according to the volume corresponding to the target area.
The above-described aspects and any possible implementations further provide an implementation, and the method further includes:
monitoring the actual respiratory amplitude of the subject during irradiation;
when the actual breathing amplitude is larger than the designated amplitude, adjusting the alignment position of the radiation ray so as to align the radiation ray with the designated position in the target area.
In a fourth aspect, an embodiment of the present invention provides a radiation dose obtaining system, which includes a processor and a memory; the memory is for storing instructions that, when executed by the processor, cause the system to implement the method of any of the third aspects.
In a fifth aspect, an embodiment of the present invention provides a medical imaging method, including:
before scanning the heart of a detected object, acquiring a first respiratory signal of the detected object;
determining breath holding starting time according to the first breathing signal and the breath holding indicating information so as to prompt the detected object to enter a breath holding state at the breath holding starting time;
starting scanning the detected object at the breath-holding starting moment to obtain a scanning image;
and obtaining a reconstructed image according to the scanning image.
As with the above-described aspects and any possible implementations, there is further provided an implementation, where the method further includes:
acquiring a second respiratory signal of the detected object in the scanning process;
obtaining a reconstructed image from the scan image, comprising: according to the second respiration signal, selecting an image which accords with breath holding conditions during image acquisition from the scanning image as an image to be reconstructed; and carrying out reconstruction processing on the image to be reconstructed to obtain the reconstructed image.
As with the above-described aspects and any possible implementations, there is further provided an implementation, where the method further includes:
counting the total duration which accords with breath holding conditions in the scanning process according to the second respiratory signal;
determining a quality parameter value of the reconstructed image based on the total duration;
comparing the quality parameter value with a quality parameter reference value to obtain a comparison result;
and judging whether the reconstructed image is qualified or not according to the comparison result.
In a sixth aspect, an embodiment of the present invention provides a medical imaging system, which includes a processor and a memory; the memory is for storing instructions that, when executed by the processor, cause the system to implement the method of any of the fifth aspects.
One embodiment of the present invention has the following advantageous effects:
the embodiment of the invention controls the respiratory frequency and the respiratory amplitude of the detected object through the breathing equipment before scanning so that the detected object breathes according to the set respiratory frequency and the set respiratory amplitude, the set respiratory amplitude is smaller than the designated amplitude, the detected object is scanned in the process of breathing according to the set respiratory frequency and the set respiratory amplitude to obtain a scanned image, a reconstructed image is obtained according to the scanned image, the respiratory amplitude of the detected object in the scanning process is controlled below a certain degree, and the artifact in the scanned image is weakened, thereby improving the image quality of the reconstructed image obtained according to the scanned image.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a diagram illustrating a first flowchart of a medical imaging method according to an embodiment of the present invention.
Fig. 2 is a diagram illustrating a second flow chart of a medical imaging method according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating a method for obtaining a radiation dose according to an embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating a principle of adjusting an alignment position of a radiation beam according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The word "if" as used herein may be interpreted as "at 8230; \8230;" or "when 8230; \8230;" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
Example one
The embodiment of the invention provides a medical imaging method which can be applied to the scanning imaging process of CT equipment, PET equipment and RT equipment.
Fig. 1 is a diagram illustrating a first flowchart of a medical imaging method according to an embodiment of the present invention. As shown in fig. 1, in the present embodiment, the medical imaging method may include the following steps:
s101, before scanning, the breathing frequency and the breathing amplitude of the detected object are controlled through breathing equipment, so that the detected object can breathe according to the set breathing frequency and the set breathing amplitude, and the set breathing amplitude is smaller than the designated amplitude.
S102, in the process that the detected object breathes according to the set breathing frequency and the set breathing amplitude, the detected object is scanned to obtain a scanning image.
And S103, obtaining a reconstructed image according to the scanning image.
Wherein the breathing apparatus may be a ventilator.
Medical imaging equipment can be according to the imaging needs and the respiratory signal under the uncontrolled condition of the subject who gathers, calculates the numerical value of setting for respiratory frequency and the numerical value of setting for respiratory amplitude, then will set for respiratory frequency's numerical value and the pressure value that obtains through the numerical value conversion of setting for respiratory amplitude, transmits for respiratory equipment through the communication interface between medical imaging equipment and the respiratory equipment to respiratory equipment breathes according to setting for respiratory frequency and setting for respiratory amplitude control subject.
Wherein the specified amplitude may be determined from the relationship of the artifact to the breathing amplitude. Because the larger the breathing amplitude is, the more serious the artifact is, a reference artifact degree value can be set according to experience, and when the severity of the artifact in the scanned image is equal to the reference artifact degree value, the image quality of a reconstructed image obtained according to the scanned image meets the set requirement. Assuming that the respiration amplitude corresponding to the artifact with reference to the artifact degree value is the reference respiration amplitude, the specified amplitude may be equal to or smaller than the reference respiration amplitude.
In step S102, since the breathing amplitude of the subject is controlled to be a set breathing amplitude smaller than the specified amplitude during the scanning process, the artifact in the scanned image is controlled to be below the set level, so as to ensure that the reconstructed image obtained from the scanned image in step S103 has good image quality.
Therefore, the embodiment of the invention weakens the artifact in the scanned image by controlling the breath of the detected object, thereby reducing the influence of the artifact on the image quality and improving the image quality.
Furthermore, the scanning success rate is improved due to the improvement of the image quality, the re-scanning condition caused by unqualified image quality is reduced, and the scanning efficiency is further improved.
In one exemplary implementation, the medical imaging method may further include: collecting respiratory signals of a detected object in a scanning process; obtaining a reconstructed image from the scan image, comprising: selecting an image to be reconstructed from the scanned image according to the respiratory signal; and carrying out reconstruction processing on the image to be reconstructed to obtain a reconstructed image.
Wherein, the acquired respiratory signal is the actual respiratory signal of the detected object in the scanning process.
After the breathing of the subject is controlled, although the subject breathes according to the set breathing frequency and the set breathing amplitude as a whole, due to some unexpected situations, the actual breathing amplitude is larger than the set breathing amplitude in a short time in the scanning process. In order to ensure the image quality of the reconstructed image, the scanned image obtained in the time when the actual respiratory amplitude is greater than the set respiratory amplitude needs to be removed, so that the rest scanned images used for reconstruction are still images corresponding to the actual respiratory amplitude equal to or less than the set respiratory amplitude, and a reconstructed image with better quality can be obtained. Therefore, the unqualified quality of the final reconstructed image caused by the fact that the short breathing amplitude is overlarge in the scanning process is avoided, the number of times of repeated scanning is reduced, and the scanning efficiency is improved.
Wherein, according to the respiration signal, selecting the image to be reconstructed from the scanning image, which may include: searching a time period of which the corresponding respiration amplitude is larger than a set respiration amplitude in the respiration signal as a marked time period; and deleting the image of which the corresponding scanning time is in the marked time period from the scanned image, and selecting the residual image as the image to be reconstructed.
In an exemplary implementation, before the reconstructing process is performed on the image to be reconstructed to obtain the reconstructed image, the medical imaging method may further include: according to the respiration signal, respiratory motion correction is carried out on the image to be reconstructed to obtain a corrected image; carrying out reconstruction processing on an image to be reconstructed to obtain a reconstructed image, wherein the reconstruction processing comprises the following steps: and carrying out reconstruction processing on the corrected image to obtain a reconstructed image.
By respiratory motion correction, artifacts in the image to be reconstructed can be weakened, thereby improving the image quality of the reconstructed image.
In one exemplary implementation, the medical imaging method may further include: monitoring the actual respiratory amplitude of a detected object in the scanning process; when the actual respiratory amplitude is larger than the designated amplitude, the respiratory frequency of the detected object is adjusted by the respiratory device so as to enable the actual respiratory amplitude of the detected object to be smaller than the designated amplitude.
In the scanning process, due to some unexpected conditions, the actual respiratory amplitude is possibly larger than the designated amplitude, at the moment, the respiratory frequency of the detected object is adjusted through the respiratory equipment, so that the actual respiratory amplitude of the detected object is smaller than the designated amplitude, the scanning failure can be avoided, the number of times of rescanning is reduced, and the scanning efficiency is improved.
The medical imaging method provided by the embodiment of the invention controls the respiratory frequency and the respiratory amplitude of the detected object through the breathing equipment before scanning so that the detected object breathes according to the set respiratory frequency and the set respiratory amplitude, the set respiratory amplitude is smaller than the designated amplitude, the detected object is scanned in the process of breathing according to the set respiratory frequency and the set respiratory amplitude to obtain a scanned image, a reconstructed image is obtained according to the scanned image, the respiratory amplitude of the detected object in the scanning process is controlled below a certain degree, and the artifact in the scanned image is weakened, so that the image quality of the reconstructed image obtained according to the scanned image is improved.
Example two
The present embodiments provide a medical imaging system, the system comprising a processor and a memory; the memory is used for storing instructions which, when executed by the processor, cause the system to implement any one of the medical imaging methods of the previous embodiment.
EXAMPLE III
Breath holding is one of the determinants of success of a cardiac scan. If the object is not well screened, scanning fails and rescanning is required. In addition to being unable to hold breath, inhaling too much can degrade image quality, resulting in a failed cardiac scan because the cardiac scan requires a small breath to hold and then hold. In the prior art, the object to be detected cannot sense the inspiration degree, so that the time when breath holding is started cannot be accurately judged, the breath holding is unqualified, scanning failure is caused, the condition of needing to scan again is more, and the scanning efficiency is low.
The embodiment of the invention provides a medical imaging method which can be applied to the CT scanning imaging process of the heart of a detected object.
Fig. 2 is a diagram illustrating a second flow chart of a medical imaging method according to an embodiment of the present invention. As shown in fig. 2, in the present embodiment, the medical imaging method may include the following steps:
s201, before the heart of the detected object is scanned, a first respiration signal of the detected object is collected.
S202, determining breath holding starting time according to the first breathing signal and the breath holding indicating information so as to prompt the detected object to enter a breath holding state at the breath holding starting time.
S203, starting scanning of the detected object at the breath holding starting moment to obtain a scanning image.
And S204, obtaining a reconstructed image according to the scanning image.
The first respiratory signal and the following second respiratory signal, etc. respiratory signals may be collected by a respiratory monitoring device. The breathing signal may be a breathing waveform displayed on a screen. The horizontal axis of the respiration waveform graph represents time, and the vertical axis represents amplitude.
In step S202, the breath-holding start time is determined according to the first breathing signal and the breath-holding indication information, so that the inspiration degree can be well controlled, thereby avoiding over-inspiration.
The breath-hold indication information may be breath-hold indication scale marks marked on the respiration waveform.
The breath-holding indication scale mark can be a straight line parallel to the horizontal axis of the respiration wave form diagram, and at the moment, in the inspiration process of the detected object, the moment corresponding to the intersection point of the respiration wave form and the breath-holding indication scale mark is the breath-holding starting moment. Therefore, the examined object can visually see the own inspiration degree, so as to know the accurate moment of entering the breath holding state. Therefore, scanning failure caused by unqualified breath holding due to over-sufficient inspiration is avoided, the number of times of rescanning is reduced, and the scanning efficiency is improved.
The detected object can actively acquire the accurate moment of entering the breath holding state according to the displayed respiration waveform and the breath holding indication information by observing the display screen. When the inspiration degree is about to meet the requirement of breath holding indication information, the equipment can send out reminding information to remind the detected object to prepare to enter the breath holding state. Wherein, the reminding information can be an indicator light, a voice prompt and the like.
Wherein, the height of the breath-hold indication scale mark can be determined according to the breath amplitude. For example, the height of the breath hold indication tick mark may be set to be the product of the breath amplitude and a specified percentage. Therefore, the breath-holding degree can be well controlled aiming at the detected objects with different breathing amplitudes.
In one exemplary implementation, the medical imaging method may further include: acquiring a second respiratory signal of the detected object in the scanning process; obtaining a reconstructed image from the scan image, comprising: according to the second breathing signal, selecting an image which accords with breath holding conditions during image acquisition from the scanned image as an image to be reconstructed; and carrying out reconstruction processing on the image to be reconstructed to obtain a reconstructed image.
Although the embodiment shown in fig. 2 well controls the inspiration degree at the breath holding start by determining the breath holding start time according to the first respiration signal and the breath holding indication information, during breath holding, the respiration of the subject may slightly fluctuate which cannot be directly perceived, and the quality of the scanned image acquired during the fluctuation period is poor, which may result in unqualified reconstructed images. However, if the scan image acquired during the surge period is removed and reconstructed using the scan image of acceptable quality acquired during the breath-hold acceptable period, a reconstructed image of acceptable quality is obtained.
Therefore, in this example, by acquiring the second respiratory signal during the scanning process and selecting the image to be reconstructed from the scanned image according to the second respiratory signal, the unqualified scanned image during the cardiac scanning process is removed, and the image quality of the reconstructed image is improved, so that the rescanning times caused by the unqualified quality of the reconstructed image is reduced, and the scanning efficiency is further improved.
In one exemplary implementation, the medical imaging method may further include: according to the second respiratory signal, counting the total duration meeting the breath-holding condition in the scanning process; determining a quality parameter value of the reconstructed image based on the total duration; comparing the quality parameter value with the quality parameter reference value to obtain a comparison result; and judging whether the reconstructed image is qualified or not according to the comparison result.
The quality parameter value is a value for measuring the quality of the reconstructed image. For example, the quality parameter value may be a quality level value, and the higher the quality level value is, the better the image quality is, whereas the lower the quality level value is, the worse the image quality is.
Wherein comparing the quality parameter value with the quality parameter reference value may include: and subtracting the reference value of the quality parameter from the value of the quality parameter to obtain a difference, wherein the difference is a comparison result. If the difference is greater than 0, the reconstructed image is judged to be qualified, and rescanning is not needed; if the difference is less than 0, the reconstructed image is judged to be unqualified and needs to be rescanned.
According to the medical imaging method provided by the embodiment of the invention, before the heart of the examined object is scanned, the first respiratory signal of the examined object is acquired, the breath holding starting time is determined according to the first respiratory signal and the breath holding indicating information so as to prompt the examined object to enter the breath holding state at the breath holding starting time, the scanning of the examined object is started at the breath holding starting time to obtain a scanning image, a reconstructed image is obtained according to the scanning image, the breath holding degree in the heart scanning process is controlled by determining the breath holding starting time, the scanning failure caused by unqualified breath holding due to too much inspiration is avoided, the rescanning condition is reduced, and the scanning efficiency is improved.
Example four
An embodiment of the present invention provides a medical imaging system, which includes a processor and a memory; wherein the memory is used for storing instructions which, when executed by the processor, cause the system to implement any one of the medical imaging methods of the third embodiment.
EXAMPLE five
During the radiation treatment of the treatment object with radiation, the target region to be treated expands and contracts with the breathing movement, resulting in a constantly changing extent of the target region. When the breathing amplitude is large, the range of the target region also increases, and when the breathing amplitude is small, the range of the target region also decreases. Thus, different breathing amplitudes correspond to different ranges of the target region.
In the prior art, the radiation dose is fixed, so that when the breathing amplitude is too large, the range corresponding to the target area is large, and the radiation dose is not enough, so that the lesion in the target area can often deviate from the radiation range of the radiation rays. It can be seen that the radiation dose accuracy for irradiating the target region is low in the prior art. This can result in poor therapeutic results.
The embodiment of the invention provides a method for acquiring radiation dose, which can be applied to the process of carrying out radiation therapy on a therapeutic object by utilizing CT (computed tomography) equipment, PET (positron emission tomography) equipment or RT (reverse transcription) equipment. For example, in the process of irradiating a tumor of a treatment object with rays to kill the tumor, the radiation dose can be determined by the method for acquiring the radiation dose provided by the embodiment of the invention.
Fig. 3 is a flowchart illustrating a method for obtaining a radiation dose according to an embodiment of the present invention. As shown in fig. 3, in the present embodiment, the method for obtaining the radiation dose may include the following steps:
s301, before treatment, the breathing frequency and the breathing amplitude of the treatment object are controlled through the breathing equipment, so that the treatment object breathes according to the set breathing frequency and the set breathing amplitude, and the set breathing amplitude is smaller than the designated amplitude.
S302, in the process that the treatment object breathes according to the set breathing frequency and the set breathing amplitude, the target area is selected according to the set breathing amplitude.
And S303, determining the radiation dose for radiating the target area according to the volume corresponding to the target area.
The target region is a region to be treated, such as a region where a tumor grows in the body of the treated subject.
Before treatment, a doctor can adjust the proper breathing frequency and breathing amplitude to enable a treated object to be in the most comfortable state, and the treatment is beneficial to subsequent long-time treatment. The set respiratory frequency and the set respiratory amplitude can be obtained through respiratory training of the treatment object, and the set respiratory frequency and the set respiratory amplitude can be set to be the respiratory frequency and the respiratory amplitude corresponding to the state that the treatment object feels most comfortable.
In step S302, a target area is selected according to a set breathing amplitude, so that the range of the target area corresponds to the breathing amplitude, thereby laying a foundation for accurately determining the radiation dose.
The target region can be selected at the expiration end in the respiratory cycle, because the expiration end of the respiratory cycle corresponds to the maximum range that the target region can be expanded to, if the radiation dose can support the maximum range of the target region, the range of the target region at any time in the whole respiratory cycle can be supported.
In step S303, the radiation dose for irradiating the target region is determined according to the volume corresponding to the target region, so that the radiation dose is adapted to the volume corresponding to the target region, and the accuracy of the radiation dose is improved. This allows the radiation dose to be sufficient to support radiation treatment of the lesion in the target area, which helps to improve the treatment.
In one exemplary implementation, the method for acquiring a radiation dose may further include: monitoring the actual respiratory amplitude of the subject during irradiation; when the actual breathing amplitude is greater than the specified amplitude, the alignment position of the radiation ray is adjusted so as to align the radiation ray with the specified location in the target region.
Wherein, the appointed part is a lesion part needing to be treated, such as a tumor part.
Because the target area is selected according to the set breathing amplitude, when the actual breathing amplitude is larger than the designated amplitude, the maximum range of the target area is enlarged, the determined radiation dose is not enough to cover the whole enlarged target area, at the moment, the alignment position of the radiation ray is adjusted to enable the radiation ray to be aligned to the designated part needing to be treated in the target area, a better treatment effect can still be achieved, and the influence of the insufficient radiation dose can be compensated.
Wherein adjusting the alignment position of the radiation rays can be achieved by moving the position of the aperture in the beam limiter.
Fig. 4 is a schematic diagram of adjusting the alignment position of the radiation beam according to the embodiment of the present invention. Referring to fig. 4, the ray emitted from the ray source is blocked by the baffle plate in the beam limiter and passes through the hole formed by the baffle plate, the position of the ray source is unchanged, and when the baffle plate in the beam limiter is moved, the position of the hole is changed, so that the ray changes to be aligned with the position.
According to the radiation dose obtaining method provided by the embodiment, before treatment, the breathing frequency and the breathing amplitude of the treatment object are controlled through the breathing equipment, so that the treatment object breathes according to the set breathing frequency and the set breathing amplitude, the set breathing amplitude is smaller than the designated amplitude, in the process that the treatment object breathes according to the set breathing frequency and the set breathing amplitude, the target area is selected according to the set breathing amplitude, the radiation dose for radiating the target area is determined according to the volume corresponding to the target area, and the radiation dose for treatment is made to be adaptive to the target area selected according to the breathing amplitude, so that the appropriate radiation dose can be determined for the target area, and the accuracy of the radiation dose is improved. Moreover, the radiation dose is enough to support the radiation therapy of the lesion part in the target area, which is beneficial to improving the therapeutic effect.
EXAMPLE six
The embodiment of the invention provides a radiation dose acquisition system, which comprises a processor and a memory; the memory is configured to store instructions that, when executed by the processor, cause the system to implement the method for acquiring a radiation dose of any of the fifth previous embodiments.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the system, the apparatus, and the module described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and other divisions may be realized in practice, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one position, 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.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a Processor (Processor) to execute some steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method of medical imaging, the method comprising:
before scanning, controlling the respiratory frequency and the respiratory amplitude of a detected object through respiratory equipment so that the detected object can breathe according to a set respiratory frequency and a set respiratory amplitude, wherein the set respiratory amplitude is smaller than a designated amplitude; wherein the specified amplitude is equal to or less than a reference breath amplitude; the reference respiratory amplitude is the respiratory amplitude corresponding to the artifact of the reference artifact degree value;
scanning the detected object to obtain a scanning image in the process that the detected object breathes according to the set breathing frequency and the set breathing amplitude;
obtaining a reconstructed image according to the scanning image, wherein when the severity of the artifact in the scanning image is equal to the reference artifact degree value, the image quality of the reconstructed image obtained according to the scanning image meets the set requirement;
wherein the breathing apparatus is a ventilator; controlling the respiratory frequency and the respiratory amplitude of the detected object through the respiratory equipment so that the detected object breathes according to the set respiratory frequency and the set respiratory amplitude comprises the following steps:
according to imaging requirements and acquired respiratory signals of the detected object in an uncontrolled state, calculating a numerical value of a set respiratory frequency and a numerical value of a set respiratory amplitude;
converting the numerical value of the set respiratory frequency and the numerical value of the set respiratory amplitude into pressure values;
and transmitting the pressure value to the breathing equipment through a communication interface between the medical imaging equipment and the breathing equipment so that the breathing equipment can control the detected object to breathe according to the set breathing frequency and the set breathing amplitude.
2. The method of claim 1, further comprising:
collecting a respiratory signal of the detected object in a scanning process;
obtaining a reconstructed image from the scan image, comprising: selecting an image to be reconstructed from the scanned image according to the acquired respiratory signal of the detected object in the scanning process; and carrying out reconstruction processing on the image to be reconstructed to obtain the reconstructed image.
3. The method according to claim 2, wherein selecting an image to be reconstructed from the scanned images according to the acquisition of the respiratory signal of the object to be examined during the scanning process comprises:
searching and collecting a time period of which the corresponding respiration amplitude is larger than a set respiration amplitude in a respiration signal of the detected object in the scanning process as a mark time period; and deleting the images of which the corresponding scanning time is within the marking time period from the scanned images, and selecting the residual images as the images to be reconstructed.
4. The method according to claim 2, wherein before the image to be reconstructed is subjected to reconstruction processing to obtain the reconstructed image, the method further comprises:
according to the acquired respiratory signal of the detected object in the scanning process, respiratory motion correction is carried out on the image to be reconstructed to obtain a corrected image;
reconstructing the image to be reconstructed to obtain the reconstructed image, wherein the reconstructing comprises: and reconstructing the corrected image to obtain the reconstructed image.
5. The method of claim 1, further comprising:
monitoring the actual respiratory amplitude of the detected object during the scanning process;
when the actual respiratory amplitude is larger than the designated amplitude, adjusting the respiratory frequency of the detected object through the respiratory equipment so as to enable the actual respiratory amplitude of the detected object to be smaller than the designated amplitude.
6. A medical imaging system, the system comprising a processor and a memory; the memory is to store instructions that, when executed by the processor, cause the system to implement the method of any one of claims 1 to 5.
7. A radiation dose acquisition system, comprising a processor and a memory; the memory is to store instructions that, when executed by the processor, cause the system to implement a method comprising:
before treatment, controlling the respiratory frequency and the respiratory amplitude of a treatment object through respiratory equipment so that the treatment object breathes according to a set respiratory frequency and a set respiratory amplitude, wherein the set respiratory amplitude is smaller than a designated amplitude; wherein the specified amplitude is equal to or less than a reference breath amplitude; the reference respiratory amplitude is the respiratory amplitude corresponding to the artifact of the reference artifact degree value;
selecting a target area according to the set breathing amplitude in the process that the treatment object breathes according to the set breathing frequency and the set breathing amplitude;
determining the radiation dose for radiating the target area according to the volume corresponding to the target area, and when the severity of the artifact in the scanned image is equal to the reference artifact degree value, the image quality of a reconstructed image obtained according to the scanned image meets the set requirement;
wherein the breathing apparatus is a ventilator; controlling the respiratory frequency and the respiratory amplitude of the detected object through the respiratory equipment so that the detected object breathes according to the set respiratory frequency and the set respiratory amplitude comprises the following steps:
according to imaging requirements and acquired respiratory signals of the detected object in an uncontrolled state, calculating a numerical value of a set respiratory frequency and a numerical value of a set respiratory amplitude;
converting the numerical value of the set respiratory frequency and the numerical value of the set respiratory amplitude into pressure values;
and transmitting the pressure value to the breathing equipment through a communication interface between the medical imaging equipment and the breathing equipment so that the breathing equipment can control the detected object to breathe according to the set breathing frequency and the set breathing amplitude.
8. The system of claim 7, wherein the instructions, when executed by the processor, cause the system to further implement the method of:
monitoring the actual respiratory amplitude of the subject during irradiation;
when the actual breathing amplitude is larger than the designated amplitude, adjusting the alignment position of the radiation ray so as to align the radiation ray with the designated position in the target area.
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| JPH0556959A (en) * | 1991-09-05 | 1993-03-09 | Hitachi Medical Corp | X-ray ct device |
| US6553992B1 (en) * | 2000-03-03 | 2003-04-29 | Resmed Ltd. | Adjustment of ventilator pressure-time profile to balance comfort and effectiveness |
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| CN102266618B (en) * | 2010-12-31 | 2014-06-11 | 北京谊安医疗系统股份有限公司 | Ventilation mode switching method and device |
| DE102011079496A1 (en) * | 2011-07-20 | 2013-01-24 | Siemens Aktiengesellschaft | Method for generating combined tomographic emission- and transmission representation of breathing and cyclically moving patients with multiple rest phases, involves receiving emission-detection data from emission incidents in patients |
| CN103182121A (en) * | 2011-12-30 | 2013-07-03 | 北京谊安医疗系统股份有限公司 | Pressure trigger control method for breathing machine |
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