CN104116518A - Dosage optimized scanning method and device - Google Patents
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Abstract
An embodiment of the invention discloses a dosage optimized scanning method and device. The dosage optimized scanning method particularly comprises the steps of searching a database for corresponding scanning data according to a bodily form of an object to be scanned; performing simulation processing on the found scanning data through a dosage simulation tool to obtain simulation data; setting up a reconstructed image by means of the simulation data, and displaying the reconstructed image and a corresponding dosage value to a user so as to make the user select the dosage value to serve as a scanning dosage value according to actual needs. By means of the dosage optimized scanning method and device, overlarge or undersize dosage is avoided, and the problem that diagnostic requirements cannot be met due to overlarge radiation on the object to be scanned or poor quality of scanned images is avoided.
Description
Technical Field
The invention relates to the technical field of medical images, in particular to a dose optimization scanning method and device.
Background
The CT (computed Tom tomography) computerized tomography technology is widely applied in the medical field, and the technical principle is as follows: the X-ray beam scans the bedding with certain thickness of some part of the object to be scanned, and the detector receives the X-ray penetrating through the bedding and reconstructs the image. Since the technology mainly depends on X-rays, the excessive X-rays can cause irreversible damage to the object to be scanned and the environment. The larger the scanning dose in the CT scanning process is, the larger the radiation amount of the X-ray is, and the higher the hazard caused by the CT scanning to the object to be scanned is. Therefore, in practical applications, the medical staff should strictly control the scanning dose, and reduce the dose as much as possible to reduce the radiation of the object to be scanned on the premise of meeting the requirements of clinical diagnosis.
In practical application, medical staff often select conventional dose to perform CT dose scanning according to the body type of an object to be scanned, or set high dose or low dose to perform CT dose scanning according to the requirement of a doctor on the quality of a scanned image; due to different experiences of different medical staff, accurate dose selection cannot be guaranteed when dose is selected, and the problem that the radiation of an object to be scanned is too large or the quality of a scanned image is not high and the diagnosis requirement cannot be met due to too large or too small dose often occurs.
Based on this situation, there is a need for providing a dose scanning scheme, which can reduce the radiation of the object to be scanned while ensuring the diagnosis requirement.
Disclosure of Invention
In order to solve the above technical problem, embodiments of the present invention provide a dose optimization scanning method and apparatus, before dose scanning, a dose value and a corresponding reconstructed image are provided for a user, so that the user can preview the reconstructed image and select a scanning dose according to an actual requirement, so as to achieve a purpose of reducing radiation to a patient under a condition that a diagnosis requirement is met.
The embodiment of the application discloses the following technical scheme:
in a first aspect, the present invention provides a dose-optimized scanning method, the method comprising:
searching corresponding scanning data in a database according to the body type of the object to be scanned;
simulating the searched scanning data by using a dose simulation tool to obtain simulation data;
and establishing a reconstructed image by using the simulation data, and displaying the reconstructed image and a corresponding dose value to a user so that the user selects the dose value as a scanning dose value according to actual requirements.
Preferably, the simulation processing of the searched scan data by using the dose simulation tool to obtain simulation data includes:
and performing simulation processing on the searched scanning data in a Poisson distribution simulation mode or a Gaussian distribution simulation mode to obtain simulation data.
Preferably, the obtaining of the simulation data by performing the simulation processing on the searched scanning data in the poisson distribution simulation manner includes:
converting the searched scanning data into intensity domain generating data;
generating a Poisson distribution value aiming at a set dose value based on a Poisson distribution principle, and adding an electronic noise value to the Poisson distribution value to obtain analog intensity domain generation data; the set dosage value is smaller than the dosage value corresponding to the searched scanning data;
and converting the analog intensity domain raw data into an attenuation domain to obtain analog data.
Preferably, the obtaining of the simulation data by performing the simulation processing on the searched scanning data in the gaussian distribution simulation manner includes:
converting the searched scanning data into intensity domain generating data;
generating a Gaussian distribution value aiming at the set dose value based on a Gaussian distribution principle, and adding an electronic noise value to the Gaussian distribution value to obtain analog intensity domain generation data; the set dosage value is smaller than the dosage value corresponding to the searched scanning data;
and converting the analog intensity domain raw data into an attenuation domain to obtain analog data.
Preferably, the method further comprises:
measuring plain film data of an object to be scanned, and determining the body type of the object to be scanned by using an equivalent water model diameter algorithm; or,
measuring the height or width of a part to be scanned of an object to be scanned, and determining the body type of the object to be scanned by using the measured height or width; or,
measuring the peripheral perimeter of a part to be scanned of an object to be scanned, and determining the body type of the object to be scanned by using the measured peripheral perimeter.
In a second aspect, the present invention provides a dose optimizing scanning device, the device comprising:
the searching unit is used for searching corresponding scanning data in the database according to the body type of the object to be scanned;
the simulation unit is used for performing simulation processing on the searched scanning data by using a dose simulation tool to obtain simulation data;
and the display unit is used for establishing a reconstructed image by using the simulation data and displaying the reconstructed image and the corresponding dose value to a user so that the user can select the dose value as a scanning dose value according to actual requirements.
Preferably, the simulation unit is specifically configured to perform simulation processing on the searched scanning data in a poisson distribution simulation manner or a gaussian distribution simulation manner to obtain simulation data.
Preferably, the simulation unit includes:
the first conversion subunit is used for converting the searched scanning data into intensity domain generating data;
the first simulation subunit is used for generating a Poisson distribution value aiming at a set dose value based on a Poisson distribution principle, and adding an electronic noise value to the Poisson distribution value to obtain simulation intensity domain generation data; the set dosage value is smaller than the dosage value corresponding to the searched scanning data;
and the second conversion subunit is used for converting the analog intensity domain generated data into an attenuation domain to obtain analog data.
Preferably, the simulation unit includes:
the first conversion subunit is used for converting the searched scanning data into intensity domain generating data;
the second simulation subunit is used for generating a Gaussian distribution value aiming at the set dose value based on the Gaussian distribution principle and adding an electronic noise value to the Gaussian distribution value to obtain simulation intensity domain generation data; the set dosage value is smaller than the dosage value corresponding to the searched scanning data;
and the second conversion subunit is used for converting the analog intensity domain generated data into an attenuation domain to obtain analog data.
Preferably, the apparatus further comprises:
the first measuring unit is used for measuring plain film data of an object to be scanned and determining the body type of the object to be scanned by utilizing an equivalent water model diameter algorithm; or,
the second measuring unit is used for measuring the height or the width of a part to be scanned of the object to be scanned and determining the body type of the object to be scanned by utilizing the measured height or width; or,
and the third measuring unit is used for measuring the peripheral perimeter of the part to be scanned of the object to be scanned and determining the body type of the object to be scanned by using the measured peripheral perimeter.
According to the embodiment, the dose optimization scanning method and the device provided by the invention have the advantages that before the dose scanning of a patient, the corresponding scanning data is searched in the database according to the body type of an object to be scanned; simulating the searched scanning data by using a dose simulation tool to obtain simulation data; and establishing a reconstructed image by using the simulation data, and displaying the reconstructed image and a corresponding dose value to a user so that the user selects the dose value as a scanning dose value according to actual requirements. According to the technical scheme provided by the invention, the reconstructed image can be provided for the user in a mode of simulating the scanning data with a certain dose value before the user performs dose scanning, so that the user previews the reconstructed image, selects the scanning dose according to the actual requirement and does not need to select the scanning dose according to the personal experience value, and the problem that the radiation is too large or too small to cause too large radiation or the image quality is not high to meet the diagnosis requirement is avoided.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a dose optimized scanning method according to an embodiment of the present application;
fig. 2 is a block diagram of a dose optimizing scanning device according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
It should be noted that: the method of the invention can be used in any system capable of dose scanning, such as: ct (computed tomography) electronic computer X-ray scanning system, PET-ct (positron emission tomography) positron emission tomography scanning system, dr (digital radiography) digital radiography system, mri (magnetic Resonance imaging) magnetic Resonance imaging system, etc., which all need to determine the scanning dose before the patient is scanned with dose.
Example one
Referring to fig. 1, fig. 1 is a flowchart of a dose optimization scanning method according to an embodiment of the present application, the method including the following steps:
step 101: and searching corresponding scanning data in the database according to the body type of the object to be scanned.
Wherein, the database stores the scanning data corresponding to different body types under a certain dosage; because the object to be scanned can be a human body, an animal body, a simulation body for experiment and the like. In practical application, the scanning data corresponding to different types of different body types under a certain dosage can be stored in the database according to the actual requirement of the scanning equipment. The dose values used for different types of body types may be different or the same.
In practical application scenarios, the scanning device may perform a full scan on the object to be scanned, or may perform a scan on a specific part of the object. Such as: taking a human body as an example, the scanning device can scan the whole body of a patient, and can also scan specific parts of the head, the abdomen, the legs and the like of the patient. Based on the above, the database can also store scanning data corresponding to different body types and different parts under a certain dosage.
In a practical application scenario, factors such as age and gender of a subject to be scanned may also affect the selection of the dose, and based on this, in order to ensure that the data in the database is more reliable and accurate, scan data corresponding to different ages, different genders, different body types and different parts may also be stored in the database. Therefore, the corresponding scanning data can be found more accurately in the searching process, so that the subsequent simulation result is more reliable.
The body type of the object to be scanned can be obtained by testing in any of the following ways.
The first mode is as follows: measuring plain film data of an object to be scanned, and determining the body type of the object to be scanned by using an equivalent water model diameter algorithm.
The second mode is as follows: the height or the width of a part to be scanned of an object to be scanned is measured, and the body type of the object to be scanned is determined by using the measured height or width.
The third mode is as follows: measuring the peripheral perimeter of a part to be scanned of an object to be scanned, and determining the body type of the object to be scanned by using the measured peripheral perimeter.
Of course, in addition to the above-mentioned manner of measuring the body type of the object to be scanned, in an actual application scenario, the measurement may also be performed by other manners, which is not specifically limited herein.
And 102, simulating the searched scanning data by using a dose simulation tool to obtain simulation data.
Wherein, the dose simulation tool is a tool for adding noise into the scanning data pointing to the original dose and performing scaling processing; the tool can be in a software form or a hardware form, and the modes of the noise processing and the scaling processing can be various.
The essence of the dose simulation tool in this step is to simulate the scan data corresponding to a certain dose value by using the scan data searched, and the certain dose value is smaller than the dose value corresponding to the scan data searched. Such as: if the scan data corresponding to the dose value of 100 is stored in the database, the simulation tool in this step can only simulate the scan data corresponding to the dose value smaller than 100, which is called as simulation data. The dose value corresponding to the scan data stored in the data is referred to as a raw dose value, and the size of the raw dose value is not particularly limited. However, in practical application scenarios, the larger the original dose value is, the larger the range of dose values that can be simulated in this step is. Preferably, the range of the original dose value is greater than or equal to the conventional dose value. A conventional dose may be a specific value or a range of values.
The conventional dosage values corresponding to objects of different types and different body types are different, and for human bodies, the conventional dosage values corresponding to different body types and different parts are different, for example, the conventional dosage is not more than 80mGy for heads of normal body types of adults; normal body size in adults, with a conventional dose of no more than 30 mGy.
The unit of the dose is milligray (mGy), but in practical use, when other conditions are unchanged, the magnitude of the dose can be measured by the product mAs of the current value (mA) and the scanning time(s), i.e. the larger mAs, the larger dose; alternatively, the voltage level may be used to measure the dose size. Of course, other parameters may be used to measure the size of the dose.
Preferably, the present invention provides the following implementation:
and performing simulation processing on the searched scanning data in a Poisson distribution simulation mode or a Gaussian distribution simulation mode to obtain simulation data.
And 103, establishing a reconstructed image by using the simulation data, and displaying the reconstructed image and a corresponding dose value to a user so that the user can select the dose value as a scanning dose value according to actual requirements.
In an actual application scenario, the step 102 may be executed only once to provide a user with a reconstructed image corresponding to one dose value, or the step 102 may be executed multiple times to provide a user with reconstructed images corresponding to multiple dose values.
In an actual application scenario, steps 102 and 103 may be executed once to present a reconstructed image corresponding to a dose value to a user, and if the user selects the dose value, the method is stopped. If the user does not select the dosage value, the steps 102 and 103 are executed again to show the reconstructed image corresponding to another dosage value to the user, and so on until the user selects a dosage value. In an actual application scenario, as described above, only one dose value and reconstructed image may be provided at a time, at least two dose values and reconstructed images may be provided at a time, dose values and reconstructed images with different numbers may be provided at a time, step 102 may be performed multiple times to obtain simulation data corresponding to multiple dose values, step 103 may be performed to obtain multiple reconstructed images, and finally, the multiple reconstructed images are displayed to a user at a time, and the user selects one of the reconstructed images according to actual requirements.
Before the user performs the dose scanning, the solution of the present embodiment is used to provide the user with dose values and corresponding reconstructed images, the user previews these reconstructed images and selects a dose value according to the actual diagnosis requirements and image quality, so that the user does not determine the dose size according to personal experience.
In practical applications, when the user selects a low dose as the final scanning dose, the dose in the subsequent scanning process may be constant, or may be a non-constant dose that varies according to the variation factor in the scanning process based on the selected dose.
As can be seen from the above examples: in the dose optimization scanning method in the embodiment, before dose scanning, corresponding scanning data is searched in a database according to the body type of an object to be scanned; simulating the searched scanning data by using a dose simulation tool to obtain simulation data; and establishing a reconstructed image by using the simulation data, and displaying the reconstructed image and a corresponding dose value to a user so that the user selects the dose value as a scanning dose value according to actual requirements. That is, before the user performs a dose scan, the user is provided with a dose value and a corresponding reconstructed image, so that the user can select a dose value as a subsequent scan dose according to actual requirements. It can be seen that: the dose optimization scanning method can provide more accurate and reliable dose selection for a user, and the user only needs to preview an image and select a dose value as the dose value of subsequent scanning according to the image quality requirement required by diagnosis. The processing mode can avoid the problem of overlarge or undersize dosage, thereby avoiding the problem that the radiation of the object to be scanned is overlarge or the quality of the scanned image is not high and the diagnosis requirement cannot be met.
The implementation of the above-described dose simulation tools is further explained below, respectively.
Preferably, the obtaining of the simulation data by performing the simulation processing on the searched scanning data in the poisson distribution simulation manner includes:
step 201, converting the searched scanning data into intensity domain generating data.
202, generating a Poisson distribution value aiming at a set dose value based on a Poisson distribution principle, and adding an electronic noise value to the Poisson distribution value to obtain analog intensity domain generation data; and the set dosage value is smaller than the dosage value corresponding to the searched scanning data.
Step 203, converting the analog intensity domain generated data into an attenuation domain to obtain analog data.
The above preferred embodiments are further explained in the following in view of data formulas.
According to the formulaGenerating each set of Poisson distribution values, wherein Y represents converted intensity domain data of the searched scanning data, L represents set dose value, and H represents searched dose valueThe value of dose corresponding to the scan data of (a), L being less than H, a representing the magnification factor.
Where a specifically refers to the amplification factor that is converted from the number of photons to the detector output value. In practical applications, a can be adjusted empirically so that the simulated data for a certain dose value is consistent with the numerical level of the actual scan data.
Preferably, the obtaining of the simulation data by performing the simulation processing on the searched scanning data in the gaussian distribution simulation manner includes:
step 301, converting the searched scanning data into intensity domain generating data;
step 302, generating a gaussian distribution value aiming at a set dose value based on a gaussian distribution principle, and adding an electronic noise value to the gaussian distribution value to obtain analog intensity domain generation data; the set dosage value is smaller than the dosage value corresponding to the searched scanning data;
step 303, converting the analog intensity domain generated data into an attenuation domain to obtain analog data.
The above preferred embodiments are further explained in the following in view of data formulas.
According to the formulaGenerating to obtain Gaussian distribution values, wherein the mean value and the variance of a group of Gaussian distribution values are 0 and 0Wherein, Y represents the intensity domain generated data after the conversion of the searched scanning data, N represents the air scanning data, L represents the set dose value, H represents the dose value corresponding to the searched scanning data, L is smaller than H, and A represents the amplification factor.
Wherein, N specifically refers to scanning the air with a dose value corresponding to the searched scanning data to obtain air scanning data.
Considering that the scan data is attenuation domain data in general, and the simulation process in the above preferred embodiment is directed to intensity domain generated data, it is necessary to convert the attenuation domain data into intensity domain generated data and then perform the simulation process. If the scan data stored in the database is already intensity domain generated data, no further conversion operations need to be performed. The intensity domain processing can be operated linearly, and the calculation process is simple and feasible. The above scheme is only a preferred scheme, and in a practical application scenario, simulation processing may also be performed in other data domains, such as an attenuation domain, and the process of simulation processing may also not take electronic noise into consideration.
In addition, the invention also provides a preferable scheme for measuring the body type of the object to be scanned, and the scheme can comprise the following steps:
step 401, pre-scanning plain film data of an object to be scanned.
And 402, calculating the equivalent water model diameter of the object to be scanned according to the plain film data.
The specific calculation process of the Step is shown as Step 1-Step 3:
step 1: the plain film data is divided into a plurality of section data.
Step 2: the equivalent water mode diameter of each section data is calculated.
Data of a certain section of the tile data [ mu ]1l1,μ2l2,......μili1,2,3, the attenuation area and the equivalent water model diameter of which are calculated by the formulas (1) and (2), respectively
In the above formula (1)f(hbed,hcenter) Is a function of the correction of delta from the height of the scanning bed and the height of the center of rotation, f (h) when the object is at the center of rotationbed,hcenter) When the object is higher than the rotation center, f (h) is 1bed,hcenter)<1, when the object is lower than the rotation center, f (h)bed,hcenter)>The specific parameter descriptions are shown in the following table 1.
TABLE 1 formula parameter description for calculating equivalent water model diameter
| Parameter symbol | Description of the parameters |
| N | Number of channels |
| μi | Average attenuation coefficient of object on ith channel |
| li | Path of object on ith channel |
| Δ | Distance between adjacent detectors |
| R | Radius of rotation |
| θ | Detector fan angle |
| S | Attenuation area of a tangent plane |
| μwater | Attenuation coefficient of water |
| Dwater | Equivalent water mold diameter |
| hbed | Height of scanning bed |
| hcenter | Height of center of rotation |
| f(hbed,hcenter) | Function of correction of delta |
Step 3: and selecting the average value or the maximum value of the equivalent water model diameters of all section data as the equivalent water model diameter of the body type of the object to be scanned, and determining the body type of the object to be scanned by using the equivalent water model diameter.
And after calculating the equivalent water model diameter of each section, selecting the average value of the equivalent water model diameters of all the sections or sequencing the equivalent water model diameters of all the sections, and selecting the maximum value as the equivalent water model diameter of the object to be scanned.
Example two
Corresponding to the above method embodiments, the embodiments of the present invention also provide a dose optimization scanning device, and the internal structure and the connection relationship thereof will be further described below in conjunction with the working principle of the system. Referring specifically to fig. 2, fig. 2 is a block diagram of an embodiment 1 of a dose optimizing scanning device according to an embodiment of the present invention. The apparatus may include:
the searching unit 501 is configured to search corresponding scanning data in a database according to the body type of the object to be scanned;
a simulation unit 502, configured to perform simulation processing on the searched scan data by using a dose simulation tool to obtain simulation data;
the display unit 503 is configured to establish a reconstructed image by using the simulation data, and display the reconstructed image and a corresponding dose value to a user, so that the user selects the dose value as a scan dose value according to an actual requirement.
Preferably, the simulation unit is specifically configured to perform simulation processing on the searched scanning data in a poisson distribution simulation manner or a gaussian distribution simulation manner to obtain simulation data.
Preferably, the simulation unit includes:
the first conversion subunit is used for converting the searched scanning data into intensity domain generating data;
the first simulation subunit is used for generating a Poisson distribution value aiming at a set dose value based on a Poisson distribution principle, and adding an electronic noise value to the Poisson distribution value to obtain simulation intensity domain generation data; the set dosage value is smaller than the dosage value corresponding to the searched scanning data;
and the second conversion subunit is used for converting the analog intensity domain generated data into an attenuation domain to obtain analog data.
Preferably, the simulation unit includes:
the first conversion subunit is used for converting the searched scanning data into intensity domain generating data;
the second simulation subunit is used for generating a Gaussian distribution value aiming at the set dose value based on the Gaussian distribution principle and adding an electronic noise value to the Gaussian distribution value to obtain simulation intensity domain generation data; the set dosage value is smaller than the dosage value corresponding to the searched scanning data;
and the second conversion subunit is used for converting the analog intensity domain generated data into an attenuation domain to obtain analog data.
Preferably, the apparatus further comprises:
the first measuring unit is used for measuring plain film data of an object to be scanned and determining the body type of the object to be scanned by utilizing an equivalent water model diameter algorithm; or,
the second measuring unit is used for measuring the height or the width of a part to be scanned of the object to be scanned and determining the body type of the object to be scanned by utilizing the measured height or width; or,
and the third measuring unit is used for measuring the peripheral perimeter of the part to be scanned of the object to be scanned and determining the body type of the object to be scanned by using the measured peripheral perimeter.
As can be seen from the above examples: according to the dose optimization scanning device, before dose scanning, corresponding scanning data are searched in a database according to the body type of an object to be scanned; simulating the searched scanning data by using a dose simulation tool to obtain simulation data; and establishing a reconstructed image by using the simulation data, and displaying the reconstructed image and a corresponding dose value to a user so that the user selects the dose value as a scanning dose value according to actual requirements. That is, the user is provided with images of a plurality of low dose scans prior to a dose scan, so that the user can select one low dose as a subsequent scan dose according to actual needs. It can be seen that: the dose optimization scanning method can provide more accurate and reliable dose selection for a user, and the user only needs to preview an image and select a low dose as a dose value of subsequent scanning according to the image quality requirement required by diagnosis. The processing mode can avoid the problem of overlarge or undersize dosage, thereby avoiding the problem that the radiation to a patient is overlarge or the quality of a scanned image is not high and the diagnosis requirement cannot be met.
It should be noted that the dose optimization scanning device provided by the embodiment of the present invention may exist alone, or may be installed in an existing scanning apparatus.
It is noted that relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be noted that, as will be understood by those skilled in the art, all or part of the processes in the methods of the above embodiments may be implemented by a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The dose-optimized scanning method and device provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in the present document by applying specific embodiments, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A dose-optimized scanning method, the method comprising:
searching corresponding scanning data in a database according to the body type of the object to be scanned;
simulating the searched scanning data by using a dose simulation tool to obtain simulation data;
and establishing a reconstructed image by using the simulation data, and displaying the reconstructed image and a corresponding dose value to a user so that the user selects the dose value as a scanning dose value according to actual requirements.
2. The method of claim 1, wherein the simulating the sought scan data with the dose simulation tool results in simulated data comprising:
and performing simulation processing on the searched scanning data in a Poisson distribution simulation mode or a Gaussian distribution simulation mode to obtain simulation data.
3. The method of claim 2, wherein the obtaining the simulation data by performing the simulation process on the searched scan data in a poisson distribution simulation manner comprises:
converting the searched scanning data into intensity domain generating data;
generating a Poisson distribution value aiming at a set dose value based on a Poisson distribution principle, and adding an electronic noise value to the Poisson distribution value to obtain analog intensity domain generation data; the set dosage value is smaller than the dosage value corresponding to the searched scanning data;
and converting the analog intensity domain raw data into an attenuation domain to obtain analog data.
4. The method of claim 2, wherein the obtaining the simulation data by performing the simulation process on the searched scan data in the gaussian distribution simulation manner comprises:
converting the searched scanning data into intensity domain generating data;
generating a Gaussian distribution value aiming at the set dose value based on a Gaussian distribution principle, and adding an electronic noise value to the Gaussian distribution value to obtain analog intensity domain generation data; the set dosage value is smaller than the dosage value corresponding to the searched scanning data;
and converting the analog intensity domain raw data into an attenuation domain to obtain analog data.
5. The method of claim 1, further comprising:
measuring plain film data of an object to be scanned, and determining the body type of the object to be scanned by using an equivalent water model diameter algorithm; or,
measuring the height or width of a part to be scanned of an object to be scanned, and determining the body type of the object to be scanned by using the measured height or width; or,
measuring the peripheral perimeter of a part to be scanned of an object to be scanned, and determining the body type of the object to be scanned by using the measured peripheral perimeter.
6. A dose optimizing scanning device, the device comprising:
the searching unit is used for searching corresponding scanning data in the database according to the body type of the object to be scanned;
the simulation unit is used for performing simulation processing on the searched scanning data by using a dose simulation tool to obtain simulation data;
and the display unit is used for establishing a reconstructed image by using the simulation data and displaying the reconstructed image and the corresponding dose value to a user so that the user can select the dose value as a scanning dose value according to actual requirements.
7. The apparatus of claim 6,
the simulation unit is specifically configured to perform simulation processing on the searched scanning data in a poisson distribution simulation mode or a gaussian distribution simulation mode to obtain simulation data.
8. The apparatus of claim 7, wherein the analog unit comprises:
the first conversion subunit is used for converting the searched scanning data into intensity domain generating data;
the first simulation subunit is used for generating a Poisson distribution value aiming at a set dose value based on a Poisson distribution principle, and adding an electronic noise value to the Poisson distribution value to obtain simulation intensity domain generation data; the set dosage value is smaller than the dosage value corresponding to the searched scanning data;
and the second conversion subunit is used for converting the analog intensity domain generated data into an attenuation domain to obtain analog data.
9. The apparatus of claim 7, wherein the analog unit comprises:
the first conversion subunit is used for converting the searched scanning data into intensity domain generating data;
the second simulation subunit is used for generating a Gaussian distribution value aiming at the set dose value based on the Gaussian distribution principle and adding an electronic noise value to the Gaussian distribution value to obtain simulation intensity domain generation data; the set dosage value is smaller than the dosage value corresponding to the searched scanning data;
and the second conversion subunit is used for converting the analog intensity domain generated data into an attenuation domain to obtain analog data.
10. The apparatus of claim 6, further comprising:
the first measuring unit is used for measuring plain film data of an object to be scanned and determining the body type of the object to be scanned by utilizing an equivalent water model diameter algorithm; or,
the second measuring unit is used for measuring the height or the width of a part to be scanned of the object to be scanned and determining the body type of the object to be scanned by utilizing the measured height or width; or,
and the third measuring unit is used for measuring the peripheral perimeter of the part to be scanned of the object to be scanned and determining the body type of the object to be scanned by using the measured peripheral perimeter.
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