CN113925525A - Method and apparatus for modulating radiation dose - Google Patents
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Abstract
The invention discloses a method and a device for modulating radiation dose, relates to the technical field of data, and mainly aims to solve the problem of poor modulation accuracy of the existing CT dose. The method comprises the following steps: acquiring first attenuation information of the determined shape filter and a plain film radiation dose of at least one section in a plain film scanning image; after scanning the target area based on the flat-sheet radiation dose starting radiation, determining third attenuation information which is expected to be generated by the target radiation position without starting the radiation based on second attenuation information generated by the starting radiation of the determined radiation position; and correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation of the target radiation position according to the fourth attenuation information obtained after correction and the flat sheet radiation dose. The method is mainly used for modulating the radiation dose.
Description
Technical Field
The present invention relates to the field of data technologies, and in particular, to a method and an apparatus for modulating a radiation dose.
Background
With the continuous development of medical technology, ct (computed tomography), i.e. computed tomography, has been widely used in clinical medical scanning and detection due to its advantages of fast scanning time, clear imaging, etc. The CT radiation dose modulation scanning technique refers to a technique for continuously adjusting the scanning dose according to different patients, different scanning areas and different scanning positions during the scanning process.
At present, the existing CT dose modulation usually estimates the size of a scanning position according to attenuation information of a known scanning position and the estimated attenuation information of the scanning position, and then estimates a proper scanning dose to set, but when a scanning area is placed eccentrically, due to the existence of a shape filter, the estimation of the scanning position dose is inaccurate, and especially, the shape filter with a thick edge seriously affects the accuracy of the CT dose modulation.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for modulating radiation dose, and mainly aims to solve the problem of poor modulation accuracy of the conventional CT dose.
According to an aspect of the present invention, there is provided a method of modulating a radiation dose, including:
acquiring first attenuation information of the determined shape filter and a plain film radiation dose of at least one section in a plain film scanning image;
after scanning the target area based on the flat-sheet radiation dose starting radiation, determining third attenuation information which is expected to be generated by the target radiation position without starting the radiation based on second attenuation information generated by the starting radiation of the determined radiation position;
and correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation of the target radiation position according to the fourth attenuation information obtained after correction and the flat sheet radiation dose.
Further, the step of correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation at the target radiation position according to the corrected fourth attenuation information and the flat sheet radiation dose includes:
acquiring first equivalent diameter information matched with the determined radioactive ray position and second equivalent diameter information matched with the target radioactive ray position;
calculating corrected attenuation information matched with the third attenuation information based on the first equivalent diameter information, the equivalent diameter information and a correction coefficient, and determining fourth attenuation information based on the sum of the corrected attenuation information and the first attenuation information;
and screening out the maximum attenuation value corresponding to each radioactive ray in the target radioactive ray position from the fourth attenuation information, and distributing the radioactive ray dose of each radioactive ray by combining a preset dose modulation function, the maximum attenuation value and the plain film radioactive ray dose.
Further, before the obtaining the first attenuation information of the determined shape filter, the method further includes:
calculating the path length of at least one radioactive ray in the shape filter according to the stored shape information of the shape filter and the spatial geometrical relation of a preset scanning device, and determining first attenuation information matched with the path length based on at least one voltage value; or the like, or, alternatively,
first radiation data generated by scanning with a shape filter mounted and second radiation data generated by scanning without the shape filter mounted are acquired, and first attenuation information is determined based on a logarithmic difference between the second radiation data and the first radiation data.
Further, before the acquiring the flat-film radiation dose of at least one section in the flat-film scanning image, the method further comprises:
starting the plain film scanning operation of all the areas based on the preset scanning direction, and collecting at least one section in the plain film scanning image;
constructing an equivalent attenuation area of the section based on the object attenuation information corresponding to all the regions and the first attenuation information, and calculating equivalent diameter information based on an equivalent diameter function;
and acquiring a preset scanning condition, and determining the plain film radioactive ray dose corresponding to the section by combining the preset scanning condition and the equivalent diameter information.
Further, the method further comprises:
third radiation data generated by scanning the whole area with the shape filter installed and fourth radiation data generated by scanning the air with the shape filter installed, and object attenuation information is determined based on a logarithmic difference between the third radiation data and the fourth radiation data.
Further, the determining third attenuation information that the target radiation position does not initiate radiation expected to be generated based on the determined second attenuation information that the radiation position initiates radiation generation includes:
acquiring a determined radiation position in a scanning process and second attenuation information matched with the determined radiation position;
determining an associated radiation position corresponding to the determined radiation position based on the radiation optical path relation and the scanning rotation angle;
when the target radiation position is an associated radiation position, third attenuation information matched with the associated radiation position is determined based on the second attenuation information.
Further, the method further comprises:
and constructing a radiation dose curve according to the scanning position of the section and the plain film radiation dose, and searching the plain film radiation dose matched with the target radiation position based on the radiation dose curve.
According to another aspect of the present invention, there is provided a radiation dose modulation apparatus comprising:
an acquisition module for acquiring first attenuation information of the determined shape filter and a plain film radiation dose of at least one section in a plain film scanned image;
the first determining module is used for determining third attenuation information which is expected to be generated by radiation which is not started at the position of the target radiation based on second attenuation information generated by the radiation which is started at the determined position of the radiation after the target area is scanned based on the flat-film radiation dose starting radiation;
and the second determining module is used for correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation of the target radiation position according to the fourth attenuation information obtained after correction and the flat sheet radiation dose.
Further, the second determining module includes:
a first acquisition unit configured to acquire first equivalent diameter information that matches the determined radiation position and second equivalent diameter information that matches the target radiation position;
a first calculation unit configured to calculate corrected attenuation information matching the third attenuation information based on the first equivalent diameter information, the equivalent diameter information, and a correction coefficient, and determine fourth attenuation information based on a sum of the corrected attenuation information and the first attenuation information;
a first determining unit, configured to screen out a maximum attenuation value corresponding to each radiation in the target radiation position from the fourth attenuation information, and distribute a radiation dose of each radiation by combining a preset dose modulation function, the maximum attenuation value, and the plain film radiation dose.
Further, the apparatus further comprises:
the third determining module is used for calculating the path length of at least one radioactive ray in the shape filter according to the stored shape information of the shape filter and the spatial geometrical relationship of the preset scanning equipment, and determining first attenuation information matched with the path length based on at least one voltage value; or the like, or, alternatively,
a fourth determination module configured to acquire first radiation data generated by scanning with a shape filter mounted thereon and second radiation data generated by scanning without the shape filter mounted thereon, and determine first attenuation information based on a logarithmic difference between the second radiation data and the first radiation data.
Further, the apparatus further comprises:
the acquisition module is used for starting plain film scanning operation on all the areas based on a preset scanning direction and acquiring at least one section in a plain film scanning image;
the calculating module is used for constructing the equivalent attenuation area of the section based on the attenuation information of the objects corresponding to all the regions and the first attenuation information and calculating equivalent diameter information based on an equivalent diameter function;
and the fifth determining module is used for acquiring a preset scanning condition and determining the plain film radioactive ray dose corresponding to the section by combining the preset scanning condition and the equivalent diameter information.
Further, the apparatus further comprises:
a sixth determining module for determining object attenuation information based on third radiation data generated by mounting a shape filter for whole area scanning and fourth radiation data generated by mounting the shape filter for air scanning, and based on a logarithmic difference between the third radiation data and the fourth radiation data.
Further, the first determining module comprises:
a second acquisition unit for acquiring a determined radiation position during scanning and second attenuation information matching the determined radiation position;
a second determination unit configured to determine an associated radiation position corresponding to the determined radiation position based on a radiation optical path relationship and a scan rotation angle;
a third determining unit, configured to determine, when the target radiation position is an associated radiation position, third attenuation information that matches the associated radiation position based on the second attenuation information.
Further, the apparatus further comprises:
and the construction module is used for constructing a radiation dose curve according to the scanning position of the section and the flat sheet radiation dose so as to search the flat sheet radiation dose matched with the target radiation position based on the radiation dose curve.
According to still another aspect of the present invention, there is provided a storage medium having stored therein at least one executable instruction that causes a processor to perform operations corresponding to the modulation method of radiation dose as described above.
According to still another aspect of the present invention, there is provided a terminal including: the system comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete mutual communication through the communication bus;
the memory is used for storing at least one executable instruction, and the executable instruction enables the processor to execute the operation corresponding to the modulation method of the radiation dose.
By the technical scheme, the technical scheme provided by the embodiment of the invention at least has the following advantages:
compared with the prior art, the embodiment of the invention obtains the first attenuation information of the determined shape filter and the plain film radiation dose of at least one section in the plain film scanning image; after scanning the target area based on the flat-sheet radiation dose starting radiation, determining third attenuation information which is expected to be generated by the target radiation position without starting the radiation based on second attenuation information generated by the starting radiation of the determined radiation position; and correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation at the target radiation position according to the fourth attenuation information obtained after correction and the flat sheet radiation dose, so that the precise modulation of the radiation dose at each scanning position by combining a shape filter is realized, the accuracy of CT radiation dose modulation is greatly improved, and the requirement of accurate scanning of different human body regions is met.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart illustrating a method for modulating radiation dose according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a human body plain film scan according to an embodiment of the present invention;
FIG. 3 is a graph showing a radiation dose curve of each region plane according to an embodiment of the present invention;
FIG. 4 is a flow chart of another method for modulating radiation dose provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a spatial geometry provided by an embodiment of the present invention;
FIG. 6 is a flow chart of a method for modulating radiation dose according to an embodiment of the present invention;
FIG. 7 illustrates a schematic diagram of an attenuation curve provided by an embodiment of the present invention;
FIG. 8 is a flow chart illustrating a method for modulating radiation dose according to another embodiment of the present invention;
FIG. 9 illustrates a radiation path diagram provided by an embodiment of the present invention;
FIG. 10 is a block diagram of a radiation dose modulating apparatus according to an embodiment of the present invention;
fig. 11 shows a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
An embodiment of the present invention provides a method for modulating a radiation dose, as shown in fig. 1, the method including:
101. first attenuation information of the determined shape filter is acquired, and a flat-film radiation dose of at least one cross-section in the flat-film scanned image is acquired.
In the embodiment of the invention, the modulation of the radiation dose is in the process of scanning organs of each region of the human body by radiation, so that the shape filter in a scanning field needs to be determined to be stored in a current execution subject when the modulation is performed. The terminal device which can be used as the current execution main body can be a computer terminal connected with the scanning device, and can also be a cloud server connected with the scanning device, so that when the scanning device is combined to scan a human body, CT scanning is carried out according to the stored size information of the shape filter, and then, in the modulation process, first attenuation information of the shape filter is obtained. In addition, in order to make the radiation dose of the adjustment more fit to each region of the human body, the flat-film radiation dose of at least one section in the flat-film scanning image is acquired, and the flat-film radiation dose refers to the required scanning dose of the scanning device which rotates once at a certain position and is scanned once.
It should be noted that the plain film scan in the embodiment of the present invention is set to scan the whole corresponding to the target region under the condition of a given minute radiation dose and a preset shape filter and voltage, for example, under the condition of a large shape filter and 120kV, the human body is subjected to the plain film scan to obtain plain film image data. In the flat-film scanning process, the scanning range, i.e. the preset direction and the preset cross-section scanning position, can be preset, and the flat-film image data is sampled, each time one flat-film image data is sampled, i.e. corresponding to one cross section, for example, as shown in fig. 2, the human body flat-film scanning is set as the z direction from head to foot, the scanning is performed according to the shoulder position a and parallel to the z direction, the cross section at the a position is obtained, the cross section a is perpendicular to the z direction, the scanning is performed according to the sternum part b and parallel to the z direction, the cross section at the b position is obtained, the cross section b is perpendicular to the z direction, the scanning is performed according to the navel part c and parallel to the z direction, the cross section at the c position is obtained, the cross section c is perpendicular to the z direction, the scanning is performed according to the hip part d and parallel to the z direction, and the cross section at the d position is obtained, and the cross section d is perpendicular to the z direction. Since the corresponding flat-panel radiation doses can be calculated for different cross-sections, as shown in the flat-panel radiation dose graph of each part shown in fig. 3, the flat-panel radiation doses of the cross-sections corresponding to each scanning position from the scanning position a to the scanning position d can be obtained, where mAs is the flat-panel radiation dose, and mAs _ b is the flat-panel radiation dose of the position b.
102. And after scanning the target area based on the flat-sheet radiation dose starting radiation, determining third attenuation information which is expected to be generated by the target radiation position without starting radiation based on second attenuation information generated by the starting radiation of the determined radiation position.
In the embodiment of the invention, after the flat-film radiation dose is determined, in order to realize the modulation of the radiation dose in the scanning process, the radiation is started to scan the target area based on the flat-film radiation dose. Since the activated radiation is based on the radiation source emitting each radiation, the radiation source at each position can emit a plurality of radiation, and the radiation is received through each channel, so that the radiation in the embodiment of the present invention is obtained, and the dose emitted by each radiation is modulated based on the flat-sheet radiation dose as the total dose value. The target region may include, but is not limited to, any body region of a human body, for example, a bulb serving as a radiation source in a flat-sheet radiation dose-based activation scanning apparatus emits a plurality of rays to be received through a plurality of channels, and at this time, corresponding second attenuation information may be calculated based on the activated radiation, and a position of the non-activated radiation may be obtained based on the known property of the position of the radiation source, so as to determine third attenuation information expected to be generated by the target position in the case of the non-activated radiation.
It should be noted that, because one or more radiation sources in the scanning device are installed at the edge of a hollow device with a circular cross section, a human body lies on a scanning bed in the hollow device, and the radiation sources are activated by the device to scan the human body, thereby completing the radiation operation, in the embodiment of the present invention, the scanning device may be a static CT device, or a dynamic CT device, which is not limited specifically. Specifically, since the optical paths of the respective radiation sources are opposite during the rotation of the respective radiation sources, based on the principle that the optical paths are reversible, the position of the target radiation that is not irradiated may be determined based on the determined position of the radiation, so as to estimate the third attenuation information that is expected to be generated when the target radiation position is determined not to start the radiation.
103. And correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation of the target radiation position according to the fourth attenuation information obtained after correction and the flat sheet radiation dose.
In the embodiment of the present invention, since the third attenuation information is the attenuation information expected to be generated when the estimated target radiation position is not activated, in order to accurately modulate the radiation dose, the third attenuation information is modulated based on the equivalent diameter information and the first attenuation information. Since the human body is subjected to the radiation scanning, the human body can be equivalent to water, and meanwhile, the diameters of different body regions of the human body are different, so that the equivalent diameter information is the equivalent diameter information calculated based on the equivalent water model diameter and the attenuation area of the corresponding region of the human body. Since the radiation source is attached to each radiation emitting position to emit radiation and the flat panel radiation dose is a total radiation dose value, the radiation dose expected to be required for each radiation at the target radiation position is determined by combining the fourth attenuation information obtained by correcting the third attenuation information and the flat panel radiation dose.
Since the radiation source at the target radiation position emits fan beam radiation and is received by the detectors of the plurality of channels to obtain a plurality of radiations, and the corresponding third attenuation information is attenuation information corresponding to each radiation, the third attenuation information represents an attenuation value of each radiation, and after correction is performed based on the equivalent diameter information and the first attenuation information, the fourth attenuation information also represents an attenuation value after correction of each radiation, and further, when a radiation dose of each radiation is performed, calculation can be performed based on attenuation values of a plurality of radiations corresponding to each position. Wherein, each channel of radiation receives one radiation, for example 672 channels, and then 672 radiation is obtained, and 627 attenuation values are obtained. Therefore, the radiation received by each radiation channel in the target radiation position may calculate a corresponding attenuation value, in the embodiment of the present invention, the maximum attenuation value may be selected as a calculation parameter of the radiation dose corresponding to the radiation at the target radiation position, which is not specifically limited in the embodiment of the present invention.
In an embodiment of the present invention, for further limitation and description, as shown in fig. 4, the step 103 of correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining a radiation dose corresponding to the radiation at the target radiation position according to the fourth attenuation information obtained after correction and the flat sheet radiation dose specifically includes: 1031. acquiring first equivalent diameter information matched with the determined radioactive ray position and second equivalent diameter information matched with the target radioactive ray position; 1032. calculating corrected attenuation information matched with the third attenuation information based on the first equivalent diameter information, the equivalent diameter information and a correction coefficient, and determining fourth attenuation information based on the sum of the corrected attenuation information and the first attenuation information; 1033. and screening out the maximum attenuation value corresponding to each radioactive ray in the target radioactive ray position from the fourth attenuation information, and distributing the radioactive ray dose of each radioactive ray by combining a preset dose modulation function, the maximum attenuation value and the plain film radioactive ray dose.
In the embodiment of the invention, due to the fact that the diameters of different body areas of a human body are different, under the condition that the human body is equivalent to water, third attenuation information is combined to be generated for the expectation of the position of the radiation target which is not startedThe first equivalent diameter information matching the determined radiation position is acquired, namely, when scanning is carried out at the determined radioactive ray position, the equivalent diameter corresponding to the human body area is obtained, and meanwhile, the second equivalent diameter information matched with the target radioactive ray position is obtained, i.e., the corresponding equivalent diameter of the body region at the time of the intended scan at the location where no radiation is initiated, e.g., because the scanning bed continuously moves in the scanning process, the scanning is carried out according to the continuous change of the position in the z direction, the obtained equivalent diameter information of each section is different in the z position of different sections, if the first equivalent diameter information is the equivalent diameter of the head part with the determined radioactive ray position, the second equivalent diameter information is the equivalent diameter of the chest part without the determined radioactive ray position, of course, the equivalent diameter information corresponding to different regions can be determined according to the scanning position. In this embodiment of the present invention, for correcting the third attenuation information, the corrected attenuation information matched with the first equivalent diameter information, the second equivalent diameter information, the correction coefficient, and the third attenuation information may be calculated by presetting a first correction function, where the preset first correction function is: RayAtt ═ RayAtt' ((D (i)/D (j)))cof2Where RayAtt' is third attenuation information, that is, attenuation values of radiation rays in the radiation channels of the determined target radiation position, d (i) is first equivalent diameter information corresponding to the determined radiation position, d (j) is second equivalent diameter information corresponding to the target radiation position, cof2 is a correction coefficient, and RayAtt obtained by calculation is a corrected attenuation value. Furthermore, the sum of the corrected attenuation information and the first attenuation information is determined as fourth attenuation information, i.e., RayAtt, in consideration of the influence of the shape filter on the radiation attenuation-And (4) finishing the correction of the third attenuation information and realizing the accurate correction of the third attenuation information by using ul as the first attenuation information, wherein the ul is RayAtt + ul, and the third attenuation information is accurately corrected, so that the calculated radioactive ray dose is more attached to different body regions of the human body.
It should be noted that the fourth attenuation information corresponds to a plurality of radiation attenuation values generated for each radiation of the target radiation position, and therefore, in order to distribute the radiation dose of each radiation based on the flat sheet radiation dose, first, the maximum attenuation value among the plurality of attenuation values corresponding to the plurality of radiations generated by emitting radiation in each radiation channel in the target radiation position is selected, and second, the radiation dose corresponding to each radiation is calculated in combination with a preset dose modulation function. Wherein the preset dose modulation function is:
For further definition and explanation, in one embodiment of the present invention, before the step 101 obtaining the first attenuation information of the determined shape filter, the method further comprises: calculating the path length of at least one radioactive ray in the shape filter according to the stored shape information of the shape filter and the spatial geometrical relation of a preset scanning device, and determining first attenuation information matched with the path length based on at least one voltage value; or, first radiation data generated by scanning with a shape filter mounted and second radiation data generated by scanning without the shape filter mounted are acquired, and first attenuation information is determined based on a logarithmic difference between the second radiation data and the first radiation data.
In order to realize accurate calculation of the first attenuation information, so that the radiation dose of each radioactive ray can be accurately estimated based on the first attenuation information, and the accuracy and the effect of the scanned image are improved, the first attenuation information can be calculated based on two methods in the embodiment of the invention.
The first method specifically comprises the following steps: calculating the path length of at least one radioactive ray in the shape filter according to the stored shape information of the shape filter and the spatial geometrical relation of the preset scanning device, and determining first attenuation information matched with the path length based on at least one voltage value. The shape information of the different-shape filter can be stored in advance as the current execution subject, the shape information includes, but is not limited to, concave size information, convex size information, etc., the preset scanning device space geometric relationship is the space relative position between the size information of the shape filter in the scanning device and the radioactive source bulb and the radiation detector, as shown in the space geometric relationship in fig. 5, the path length of each radioactive ray in the shape filter can be calculated, and therefore the first attenuation information matched with the path length is calculated based on the voltage value. Specifically, when the radiation source bulb emits radiation and then passes through the shape filter, a path is generated in the shape filter, the radiation detector receives the radiation that has passed through the shape filter, the path length is calculated for each radiation detector, and the length that has passed through the shape filter is represented as Li (i is 1, 2, and 3 … … channelNum). Meanwhile, the equivalent attenuation U and the path length of the shape filter are determined according to the different voltage values kv, and the attenuation integral ULi value of the shape filter corresponding to each radiation detector can be obtained as the first attenuation information.
The second method specifically comprises the following steps: first radiation data generated by scanning with a shape filter mounted and second radiation data generated by scanning without a shape filter mounted are acquired, and first attenuation information is determined based on a logarithmic difference between the second radiation data and the first radiation data. The current execution main body can be connected to the scanning equipment to acquire data in the scanning process, so that in order to improve the acquisition convenience of first attenuation information, two times of scanning can be performed, first radioactive ray data generated by scanning air is acquired in a state that a shape filter is installed for the first time, second radioactive ray data generated by scanning air is acquired in a state that the shape filter is not installed for the second time, the second radioactive ray data and the first radioactive ray data are subjected to logarithmic subtraction, the obtained difference value is attenuation information belonging to the shape filter, namely the first attenuation information, and for example, the shape filter a can be installed, air is scanned, and paying off is performed to obtain data A under a non-use voltage value kv; the shape filter a is not installed, air is swept, and the line is released to obtain data B; the first attenuation information ul is log (b) -log (a).
For further definition and explanation, in one embodiment of the present invention, as shown in fig. 6, before the step 101 of obtaining a flat-film radiation dose of at least one cross-section in a flat-film scanned image, the method further comprises: 201. starting the plain film scanning operation of all the areas based on the preset scanning direction, and collecting at least one section in the plain film scanning image; 202. constructing an equivalent attenuation area of the section based on the object attenuation information corresponding to all the regions and the first attenuation information, and calculating equivalent diameter information based on an equivalent diameter function; 203. and acquiring a preset scanning condition, and determining the plain film radioactive ray dose corresponding to the section by combining the preset scanning condition and the equivalent diameter information.
In order to accurately modulate the radiation dose, the flat-panel radiation dose of each section is calculated based on the flat-panel scan, thereby achieving modulation of the radiation dose required for one intended scan of radiation at the flat-panel radiation dose. The method comprises the steps of starting plain film scanning operation on all areas based on a selected preset scanning direction to acquire each section in plain film scanning images, wherein the ball tube is located right above and is 0 degrees, a scanning bed moves in a forward and backward progressive mode to finish scanning, as shown in fig. 2, at the moment, the scanning range can be preset, such as a-d, sampling is carried out on the plain film scanning images along the z direction, namely the bed advancing and retreating direction, and each sampling is a section. In addition, since the human body and the shape filter are scanned together in the plain film scanning process, the equivalent attenuation areas of the respective cross sections are constructed based on the object attenuation information and the first attenuation information. The object attenuation information is attenuation information generated by scanning all areas of a human body by a flat sheet, the first attenuation information is attenuation information of a shape filter, and specifically, the shape filter can be installed, air is swept, and paying off is carried out to obtain data A; secondly, the shape filter is not installed, air is swept, and the line is paid off to obtain data B; finally, installing a shape filter, scanning the human body, and paying off to obtain data C; thus obtaining the attenuation of the shape filter: ul1 ═ log (b) -log (a); attenuation of the scanned human body section: ul2 (log (a) -log (c)), and ul1+ ul2 can obtain an attenuation curve corresponding to the cross section, as shown in fig. 7, so as to construct the equivalent attenuation area of the cross section.
Wherein, the equivalent attenuation area is:
s is the equivalent attenuation area, muiliFor the ith detector, the attenuation value converted from the received data,
r is the distance from the pay-off position to the radiation detector, N is the number of detectors covered by the pay-off position, and α is the fan angle of the pay-off position. Function of equivalent diameter of Dscan＝2*sqrt(mean(S)/(PI*μwater))，μwaterFor the equivalent water mode diameter, PI is a circumferential ratio 3.1415926, thereby calculating equivalent diameter information D based on the equivalent diameter functionscan。
It should be noted that, since the scanning device performs the plain scan based on the preset scan condition when performing the plain scan, the plain radiation dose of the cross section can be determined based on the preset scan condition and the equivalent diameter information. Wherein the preset scanning conditions include a reference dose value mAs _ base, a reference equivalent diameter D _ base, based on the formula:
mAs_scan＝mAs_base*(exp(-μwater*D_scan)/exp(-μwater*D_base))cofthe flat radiation dose mAs _ scan is calculated, and cof is an adjustment coefficient.
In an embodiment of the present invention, for further definition and illustration, the method further comprises: third radiation data generated by scanning the whole area with the shape filter installed and fourth radiation data generated by scanning the air with the shape filter installed, and object attenuation information is determined based on a logarithmic difference between the third radiation data and the fourth radiation data.
Specifically, in order to accurately determine the attenuation information of the object, that is, the attenuation value of the human body during plain film scanning, the attenuation information of the object is determined based on the third radiation data generated by scanning the whole area with the shape filter and the fourth radiation data generated by scanning the air with the shape filter, so as to determine the attenuation information of the object based on the logarithmic difference between the third radiation data and the fourth radiation data, for example, the shape filter may be installed first, the air is swept, and the data a is obtained by paying off; secondly, installing a shape filter, scanning the human body, and paying off to obtain data C; thereby scanning the attenuation of the human section: ul2 ═ log (a) -log (c), i.e. attenuation information.
For further definition and explanation, in an embodiment of the present invention, as shown in fig. 8, the step 102 of determining third attenuation information, which is expected to be generated when radiation is not initiated at the target radiation position, based on the second attenuation information generated when radiation is initiated at the determined radiation position includes: 1021. acquiring a determined radiation position in a scanning process and second attenuation information matched with the determined radiation position; 1022. determining an associated radiation position corresponding to the determined radiation position based on the radiation optical path relation and the scanning rotation angle; 1023. when the target radiation position is an associated radiation position, third attenuation information matched with the associated radiation position is determined based on the second attenuation information.
In the embodiment of the present invention, the start-up radiation scanning includes, but is not limited to, helical scanning and tomographic scanning, and in order to accurately estimate the attenuation value expected to occur at the target radiation position where radiation is not started up based on the attenuation value corresponding to the determined position where radiation is started up, the start-up radiation scanning is determined based on the principle that the optical path is reversible in the radiation optical path relationship. First, when radiation scanning is started, it is determined that the radiation position may be a scanning start position, such as a scanning position b in fig. 2, and then, based on the flat-sheet radiation dose at the b position, N/2 times of clockwise line-off are performed with the radiation position corresponding to the 0 ° angle as a start point, resulting in N/2 sets of attenuation information as second attenuation information. Secondly, since the radiation is transmitted based on the optical path channel, the radiation position can be determined by the scanning rotation angle generated during the rotation of the scanning device based on the radiation optical path relation, i.e. the optical path reversible principle, so as to determine the associated radiation position corresponding to the radiation position in an optical path reversible way. For example, as shown in the radiation path diagram of fig. 9, after each line-up, radiation is received by 5 channels c1 to c5, and the radiation position i follows the radiation position j and the radiation position k according to the clockwise rotation direction. According to the principle of reversible optical path, the c4 channel at the radiation position j is used as the relevant radiation position, the attenuation value corresponding to the c4 channel at the radiation position j can be used as the estimated value of the c2 channel attenuation value at the radiation position i, namely, as the third attenuation information, the c1 channel at the radiation position k is used as the relevant radiation position, the attenuation value of the c1 channel at the radiation position k can be used as the estimated value of the c5 channel attenuation value at the radiation position i, and so on, a plurality of pairs of channels are obtained, because the paths of the pairs of channels passing through the object are similar, and the two pairs of channels are symmetrical about the central channel, the attenuation values of the other channels are obtained according to the principle of reversible optical path, and so on, namely, the estimated value of the third attenuation information of the radiation position of each radiation which does not start radiation. Wherein the pay-off position j or the pay-off position k is 180 degrees-A and 180 degrees + B respectively, the angle A, B is 2 x alpha and 2 x beta respectively, and alpha and beta are included angles between the c2 channel and the c5 channel and the central channel respectively.
In an embodiment of the present invention, for further definition and illustration, the method further comprises: and constructing a radiation dose curve according to the scanning position of the section and the plain film radiation dose, and searching the plain film radiation dose matched with the target radiation position based on the radiation dose curve.
In the embodiment of the invention, since the attenuation value of the human body scanned by each section can be obtained by calculation, the average ray dose of each section is calculated according to the attenuation information of the object obtained by scanning the human body and the first attenuation information of the shape filter. In order to accurately search the plane radioactive ray doses corresponding to the sections of different human body parts, the radiation curves of the scanning positions corresponding to the sections and the plane radioactive ray doses are constructed in advance in the plain film scanning process, so that the plain film radioactive ray doses matched with the target radioactive ray positions in the scanning positions are directly searched based on the radiation curves in the scanning process, and the modulation speed is improved.
Compared with the prior art, the embodiment of the invention provides a method for modulating the radiation dose, and the method comprises the steps of acquiring the first attenuation information of the determined shape filter and the radiation dose of the flat film of at least one section in the flat film scanning image; after scanning the target area based on the flat-sheet radiation dose starting radiation, determining third attenuation information which is expected to be generated by the target radiation position without starting the radiation based on second attenuation information generated by the starting radiation of the determined radiation position; and correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation at the target radiation position according to the fourth attenuation information obtained after correction and the flat sheet radiation dose, so that the precise modulation of the radiation dose at each scanning position by combining a shape filter is realized, the accuracy of CT radiation dose modulation is greatly improved, and the requirement of accurate scanning of different human body regions is met.
Further, as an implementation of the method shown in fig. 1, an embodiment of the present invention provides a radiation dose modulation apparatus, as shown in fig. 10, including:
an obtaining module 31, configured to obtain first attenuation information of the determined shape filter and a flat-film radiation dose of at least one cross section in the flat-film scanned image;
a first determining module 32, configured to determine, after scanning the target region based on the flat-sheet radiation dose activation radiation, third attenuation information that is expected to be generated when radiation is not activated at the target radiation position based on second attenuation information generated when radiation is activated at the determined radiation position;
a second determining module 33, configured to correct the third attenuation information based on the equivalent diameter information and the first attenuation information, and determine a radiation dose corresponding to the radiation at the target radiation position according to fourth attenuation information obtained after correction and the flat sheet radiation dose.
Further, the second determining module includes:
a first acquisition unit configured to acquire first equivalent diameter information that matches the determined radiation position and second equivalent diameter information that matches the target radiation position;
a first calculation unit configured to calculate corrected attenuation information matching the third attenuation information based on the first equivalent diameter information, the equivalent diameter information, and a correction coefficient, and determine fourth attenuation information based on a sum of the corrected attenuation information and the first attenuation information;
a first determining unit, configured to screen out a maximum attenuation value corresponding to each radiation in the target radiation position from the fourth attenuation information, and distribute a radiation dose of each radiation by combining a preset dose modulation function, the maximum attenuation value, and the plain film radiation dose.
Further, the apparatus further comprises:
the third determining module is used for calculating the path length of at least one radioactive ray in the shape filter according to the stored shape information of the shape filter and the spatial geometrical relationship of the preset scanning equipment, and determining first attenuation information matched with the path length based on at least one voltage value; or the like, or, alternatively,
a fourth determination module configured to acquire first radiation data generated by scanning with a shape filter mounted thereon and second radiation data generated by scanning without the shape filter mounted thereon, and determine first attenuation information based on a logarithmic difference between the second radiation data and the first radiation data.
Further, the apparatus further comprises:
the acquisition module is used for starting plain film scanning operation on all the areas based on a preset scanning direction and acquiring at least one section in a plain film scanning image;
the calculating module is used for constructing the equivalent attenuation area of the section based on the attenuation information of the objects corresponding to all the regions and the first attenuation information and calculating equivalent diameter information based on an equivalent diameter function;
and the fifth determining module is used for acquiring a preset scanning condition and determining the plain film radioactive ray dose corresponding to the section by combining the preset scanning condition and the equivalent diameter information.
Further, the apparatus further comprises:
a sixth determining module for determining object attenuation information based on third radiation data generated by mounting a shape filter for whole area scanning and fourth radiation data generated by mounting the shape filter for air scanning, and based on a logarithmic difference between the third radiation data and the fourth radiation data.
Further, the first determining module comprises:
a second acquisition unit for acquiring a determined radiation position during scanning and second attenuation information matching the determined radiation position;
a second determination unit configured to determine an associated radiation position corresponding to the determined radiation position based on a radiation optical path relationship and a scan rotation angle;
a third determining unit, configured to determine, when the target radiation position is an associated radiation position, third attenuation information that matches the associated radiation position based on the second attenuation information.
Further, the apparatus further comprises:
and the construction module is used for constructing a radiation dose curve according to the scanning position of the section and the flat sheet radiation dose so as to search the flat sheet radiation dose matched with the target radiation position based on the radiation dose curve.
Compared with the prior art, the embodiment of the invention provides a device for modulating the radiation dose, and the device comprises a first attenuation module, a second attenuation module, a third attenuation module and a fourth attenuation module, wherein the first attenuation module acquires first attenuation information of a determined shape filter and the radiation dose of at least one section in a plain film scanning image; after scanning the target area based on the flat-sheet radiation dose starting radiation, determining third attenuation information which is expected to be generated by the target radiation position without starting the radiation based on second attenuation information generated by the starting radiation of the determined radiation position; and correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation at the target radiation position according to the fourth attenuation information obtained after correction and the flat sheet radiation dose, so that the precise modulation of the radiation dose at each scanning position by combining a shape filter is realized, the accuracy of CT radiation dose modulation is greatly improved, and the requirement of accurate scanning of different human body regions is met.
According to an embodiment of the present invention, there is provided a storage medium storing at least one executable instruction, the computer executable instruction being capable of executing the method of modulating a radiation dose in any of the method embodiments described above.
Fig. 11 is a schematic structural diagram of a terminal according to an embodiment of the present invention, and the specific embodiment of the present invention does not limit the specific implementation of the terminal.
As shown in fig. 11, the terminal may include: a processor (processor)402, a Communications Interface 404, a memory 406, and a Communications bus 408.
Wherein: the processor 402, communication interface 404, and memory 406 communicate with each other via a communication bus 408.
A communication interface 404 for communicating with network elements of other devices, such as clients or other servers.
The processor 402 is configured to execute the program 410, and may specifically execute the relevant steps in the embodiment of the radiation dose modulation method described above.
In particular, program 410 may include program code comprising computer operating instructions.
The processor 402 may be a central processing unit CPU or an application Specific Integrated circuit asic or one or more Integrated circuits configured to implement embodiments of the present invention. The terminal comprises one or more processors, which can be the same type of processor, such as one or more CPUs; or may be different types of processors such as one or more CPUs and one or more ASICs.
And a memory 406 for storing a program 410. Memory 406 may comprise high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
The program 410 may specifically be configured to cause the processor 402 to perform the following operations:
acquiring first attenuation information of the determined shape filter and a plain film radiation dose of at least one section in a plain film scanning image;
after scanning the target area based on the flat-sheet radiation dose starting radiation, determining third attenuation information which is expected to be generated by the target radiation position without starting the radiation based on second attenuation information generated by the starting radiation of the determined radiation position;
and correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation of the target radiation position according to the fourth attenuation information obtained after correction and the flat sheet radiation dose.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of modulating a radiation dose, comprising:
acquiring first attenuation information of the determined shape filter and a plain film radiation dose of at least one section in a plain film scanning image;
after scanning the target area based on the flat-sheet radiation dose starting radiation, determining third attenuation information which is expected to be generated by the target radiation position without starting the radiation based on second attenuation information generated by the starting radiation of the determined radiation position;
and correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation of the target radiation position according to the fourth attenuation information obtained after correction and the flat sheet radiation dose.
2. The method according to claim 1, wherein the correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation of the target radiation position according to the corrected fourth attenuation information and the flat sheet radiation dose comprises:
acquiring first equivalent diameter information matched with the determined radioactive ray position and second equivalent diameter information matched with the target radioactive ray position;
calculating corrected attenuation information matched with the third attenuation information based on the first equivalent diameter information, the equivalent diameter information and a correction coefficient, and determining fourth attenuation information based on the sum of the corrected attenuation information and the first attenuation information;
and screening out the maximum attenuation value corresponding to each radioactive ray in the target radioactive ray position from the fourth attenuation information, and distributing the radioactive ray dose of each radioactive ray by combining a preset dose modulation function, the maximum attenuation value and the plain film radioactive ray dose.
3. The method of claim 1, wherein prior to obtaining the first attenuation information for the determined shape filter, the method further comprises:
calculating the path length of at least one radioactive ray in the shape filter according to the stored shape information of the shape filter and the spatial geometrical relation of a preset scanning device, and determining first attenuation information matched with the path length based on at least one voltage value; or the like, or, alternatively,
first radiation data generated by scanning with a shape filter mounted and second radiation data generated by scanning without the shape filter mounted are acquired, and first attenuation information is determined based on a logarithmic difference between the second radiation data and the first radiation data.
4. The method of claim 1, wherein prior to said acquiring a flat-slice radiation dose for at least one section of a flat-slice scan image, the method further comprises:
starting the plain film scanning operation of all the areas based on the preset scanning direction, and collecting at least one section in the plain film scanning image;
constructing an equivalent attenuation area of the section based on the object attenuation information corresponding to all the regions and the first attenuation information, and calculating equivalent diameter information based on an equivalent diameter function;
and acquiring a preset scanning condition, and determining the plain film radioactive ray dose corresponding to the section by combining the preset scanning condition and the equivalent diameter information.
5. The method of claim 3, further comprising:
third radiation data generated by scanning the whole area with the shape filter installed and fourth radiation data generated by scanning the air with the shape filter installed, and object attenuation information is determined based on a logarithmic difference between the third radiation data and the fourth radiation data.
6. The method of claim 5, wherein determining third attenuation information that would not be expected to result from radiation being initiated by the target radiation location based on the second attenuation information that would result from radiation being initiated by the determined radiation location comprises:
acquiring a determined radiation position in a scanning process and second attenuation information matched with the determined radiation position;
determining an associated radiation position corresponding to the determined radiation position based on the radiation optical path relation and the scanning rotation angle;
when the target radiation position is an associated radiation position, third attenuation information matched with the associated radiation position is determined based on the second attenuation information.
7. The method according to any one of claims 1-6, further comprising:
and constructing a radiation dose curve according to the scanning position of the section and the plain film radiation dose, and searching the plain film radiation dose matched with the target radiation position based on the radiation dose curve.
8. An apparatus for modulating a radiation dose, comprising:
an acquisition module for acquiring first attenuation information of the determined shape filter and a plain film radiation dose of at least one section in a plain film scanned image;
the first determining module is used for determining third attenuation information which is expected to be generated by radiation which is not started at the position of the target radiation based on second attenuation information generated by the radiation which is started at the determined position of the radiation after the target area is scanned based on the flat-film radiation dose starting radiation;
and the second determining module is used for correcting the third attenuation information based on the equivalent diameter information and the first attenuation information, and determining the radiation dose corresponding to the radiation of the target radiation position according to the fourth attenuation information obtained after correction and the flat sheet radiation dose.
9. A storage medium having stored therein at least one executable instruction for causing a processor to perform operations corresponding to the method of modulation of a radiation dose according to any one of claims 1-7.
10. A terminal, comprising: the system comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete mutual communication through the communication bus;
the memory is used for storing at least one executable instruction, and the executable instruction causes the processor to execute the operation corresponding to the modulation method of the radiation dose according to any one of claims 1-7.
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