CN109549662B - Method and device for adjusting gear of capacitor and storage medium - Google Patents
Method and device for adjusting gear of capacitor and storage medium Download PDFInfo
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- CN109549662B CN109549662B CN201910024159.XA CN201910024159A CN109549662B CN 109549662 B CN109549662 B CN 109549662B CN 201910024159 A CN201910024159 A CN 201910024159A CN 109549662 B CN109549662 B CN 109549662B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/027—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
- A61B6/035—Mechanical aspects of CT
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/58—Testing, adjusting or calibrating apparatus or devices for radiation diagnosis
Abstract
The invention discloses a method, a device and a storage medium for adjusting a capacitor gear, wherein the method comprises the steps of firstly obtaining the predicted attenuation information of the non-paying-off position of a scanned object according to the attenuation information of the paying-off position of the scanned object; then, according to the predicted attenuation information and the known scanning dose, obtaining a receiving value range of a receiving channel at a non-paying-off position, wherein each paying-off position corresponds to a plurality of receiving channels; and finally, adjusting the gear of the integrating capacitor according to the receiving value range. Compared with the prior art, the method and the device have the advantages that the proper integral capacitor gear is finally determined through predicting the attenuation information of the position where the wire is not paid off to adjust, the accuracy of measured data can be improved by utilizing the integral capacitor after the gear is adjusted, and the imaging quality of the CT machine is further improved.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a method and a device for adjusting a capacitor gear and a storage medium.
Background
During the scanning process, the X-ray passes through the scanned object and is received by the detector. In the process, the optical signal needs to be converted into an electrical signal, and finally, the electrical signal is converted into a digital signal through analog-to-digital conversion. The function of the integrating capacitance in the above process is to measure the amount of charge converted. Theoretically, the attenuation of each part of a scanned object is different, the energy of the remaining X-rays is different after the X-rays are attenuated by the object, and the charge amount measured on the corresponding integrating capacitor is also different. The gear positions of the integrating capacitors correspond to different sizes of the integrating capacitors. The corresponding measuring range is large when the integral capacitance is large, but the precision is low; the corresponding measuring range is small when the integral capacitance is small, but the precision is high.
Therefore, selecting an appropriate integrating capacitor step is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method, a device and a storage medium for adjusting a capacitor shift, which can select a proper integral capacitor shift, so that the measured data is more accurate, and the image quality is improved.
The technical scheme provided by the application is as follows:
in a first aspect, the present application provides a method for adjusting a capacitor shift position, which is applied in CT scanning, and the method includes:
obtaining the predicted attenuation information of the position where the scanned object is not paid off according to the attenuation information of the paid off position of the scanned object;
obtaining the receiving value range of the receiving channel at the position without paying off according to the predicted attenuation information and the known scanning dose; each pay-off position corresponds to a plurality of receiving channels;
and adjusting the gear of the integrating capacitor according to the receiving value range.
Optionally, the obtaining of the predicted attenuation information of the position where the scanned object is not paid off according to the attenuation information of the position where the scanned object is paid off specifically includes:
and according to the reversibility of the optical path, obtaining the predicted attenuation information of the non-line-paying-off position by using the attenuation information of the receiving channel at the line-paying-off position, wherein the receiving channel at the line-paying-off position is opposite to the receiving channel at the non-line-paying-off position.
Optionally, before the obtaining the receiving value range of the receiving channel at the non-line-release position according to the predicted attenuation information and the known scanning dose, the method further includes:
obtaining first attenuation information of the paid-off position in the Z direction according to the scanned plain film information, and obtaining second attenuation information of the non-paid-off position in the Z direction according to the scanned plain film information; the Z direction is the motion direction of the CT scanning bed;
and correcting the predicted attenuation information of the non-line-paying-off position by using the first attenuation information and the second attenuation information.
Optionally, before obtaining the receiving value range corresponding to the receiving channel of the line-releasing position according to the predicted attenuation information and the known dose of the line-releasing position, the method further includes:
and correcting the predicted attenuation information of the non-paying-off position by using the predicted attenuation information of the paying-off position adjacent to the non-paying-off position and the actual attenuation information of the adjacent paying-off position.
Optionally, the adjusting the gear of the integrating capacitor according to the received value range specifically includes:
obtaining a maximum receiving value from the receiving value range;
and adjusting the gear of the integrating capacitor according to the maximum receiving value.
In a second aspect, the present application provides a device for adjusting a shift position of a capacitor, the device comprising: the device comprises an attenuation information prediction module, a receiving value range acquisition module and a capacitance gear adjustment module;
the attenuation information prediction module is used for obtaining the predicted attenuation information of the position where the scanned object is not paid off according to the attenuation information of the paid-off position of the scanned object;
the receiving value range obtaining module is used for obtaining the receiving value range of the receiving channel at the position without paying off according to the predicted attenuation information and the known scanning dose; each pay-off position corresponds to a plurality of receiving channels;
and the capacitance gear adjusting module is used for adjusting the gear of the integrating capacitor according to the receiving value range.
Optionally, the attenuation information prediction module specifically includes:
the first prediction unit is used for obtaining the prediction attenuation information of the non-line-paying-off position by using the attenuation information of the receiving channel of the line-paying-off position according to the reversibility of the optical path, wherein the receiving channel of the line-paying-off position is opposite to the receiving channel of the non-line-paying-off position.
Optionally, the apparatus further comprises: the device comprises an attenuation information acquisition module and a first correction module;
the attenuation information acquisition module is used for acquiring first attenuation information of the paid-off position in the Z direction according to the scanned plain film information and acquiring second attenuation information of the non-paid-off position in the Z direction according to the scanned plain film information; the Z direction is the motion direction of the CT scanning bed;
The first correction module is used for correcting the predicted attenuation information of the non-paying-off position by using the first attenuation information and the second attenuation information.
Optionally, the apparatus further comprises:
and the second correction module is used for correcting the predicted attenuation information of the non-paying-off position by using the predicted attenuation information of the paying-off position adjacent to the non-paying-off position and the actual attenuation information of the adjacent paying-off position.
Optionally, the capacitance step adjustment module specifically includes: the device comprises a maximum receiving value acquisition unit and a capacitance gear adjustment unit;
the maximum received value acquiring unit is configured to acquire a maximum received value from the received value range;
and the capacitance gear adjusting unit is used for adjusting the gear of the integrating capacitor according to the maximum receiving value.
In a third aspect, the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of adjusting a capacitive step as provided in the first aspect above.
Compared with the prior art, the invention has at least the following advantages:
according to the method for adjusting the capacitance gear, firstly, predicted attenuation information of a position where a scanned object is not paid off is obtained according to attenuation information of the position where the scanned object is paid off; then, according to the predicted attenuation information and the known scanning dose, obtaining a receiving value range of a receiving channel at a non-paying-off position, wherein each paying-off position corresponds to a plurality of receiving channels; and finally, adjusting the gear of the integrating capacitor according to the receiving value range.
Since the receiving channels of the non-pay-off positions and the receiving channels of the pay-off positions are similar in path of the scanned object, the attenuation information of the pay-off positions can be used for predicting the attenuation information of the non-pay-off positions. According to the receiving value range of the receiving channel at the position where the wire is not paid off, the required integral capacitance range can be obtained, and then the required integral capacitance gear is determined according to the required integral capacitance range. Therefore, compared with the prior art, the method and the device have the advantages that the proper integral capacitor gear is finally determined through predicting the attenuation information of the position where the wire is not paid off to adjust, the accuracy of measured data can be improved by using the integral capacitor after the gear is adjusted, and the imaging quality of the CT machine is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for adjusting a shift position of an integrating capacitor according to a first embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a CT machine according to an embodiment of the present disclosure;
fig. 3 is a schematic scanning diagram of a CT scanner according to an embodiment of the present disclosure;
FIG. 4 is a flowchart of a method for adjusting the shift position of an integrating capacitor according to a second embodiment of the present disclosure;
FIG. 4a is a schematic view of a helical scan of a CT machine according to an embodiment of the present disclosure;
fig. 5 is a flowchart of a method for adjusting a shift position of an integrating capacitor according to a third embodiment of the present application;
fig. 6 is a hardware configuration diagram of a control device for adjusting a shift position of a capacitor according to a fourth embodiment of the present application;
fig. 7 is a schematic structural diagram of an apparatus for adjusting a shift position of an integrating capacitor according to a fifth embodiment of the present application.
Detailed Description
Currently, in the technical field of CT scan imaging, selection of an integrating capacitor gear is generally simply performed according to a CT scan dose. For example, the first gear of the integrating capacitor is selected according to the voltage of the CT scanning tube of 100kV, and the second gear of the integrating capacitor is selected according to the voltage of the CT scanning tube of 120 kV.
However, it has been found that the range of the integrating capacitor corresponding to the range of the integrating capacitor selected in this way may be too large or too small. If the charge quantity measured by the integral capacitor is small and the measuring range of the integral capacitor is too large, the measurement precision is too low, and the CT imaging quality is influenced; if the electric charge amount measured by the integral capacitor is large and the measuring range of the integral capacitor is too small, the electric charge amount exceeds the measuring range, and the integral capacitor cannot measure accurate data. Therefore, the improper gear of the integrating capacitor influences the measurement precision and accuracy, and the imaging quality is poor.
Based on the above problems, the present application provides a method and an apparatus for adjusting a shift of a capacitor, which predict attenuation information of a position where an object is not paid off by scanning attenuation information of the position where the object is paid off, obtain a receiving value range of a receiving channel of the position where the object is not paid off by combining with a known scanning dose, and further adjust the shift of an integrating capacitor to a proper shift according to the receiving value range.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
First embodiment
Referring to fig. 1, the figure is a flowchart of a method for adjusting a shift position of an integrating capacitor according to an embodiment of the present application.
As shown in fig. 1, the method for adjusting the shift position of the integrating capacitor according to this embodiment includes:
step 101: and obtaining the predicted attenuation information of the position of the scanned object without paying off according to the attenuation information of the paid-off position of the scanned object.
To facilitate understanding of the concepts of the pay-off position and the receiving channel of the CT machine, the present step is described with reference to the CT machine configuration illustrated in fig. 2 and the relative positions of the components.
Fig. 2 is a schematic structural diagram of a CT machine provided in this embodiment. As shown in fig. 2, the CT machine includes a support 201 rotatable about a rotation axis 202; the radiation source 203 forms a radiation beam 205 through the aperture 204, the radiation beam 205 may pass through a scanned object 206 at a central position of the support 201, and the radiation beam 205 impinges on the detector 207 after passing through the scanned object 206. The detector 207 is arranged on the gantry 201 opposite to the radiation source 203.
The detector 207 is divided into a plurality of layers in the Z direction and a plurality of receiving channels in the X direction, whereby the detector 207 is an array-like detection device constituted by a plurality of detection cells. The detection units on the same layer are arranged along the X direction, and the detection units on the same receiving channel are arranged along the Z direction. Taking the detecting unit 209 in fig. 2 as an example, the detecting unit 209 is a detecting unit located at the 7 th layer of the 3 rd receiving channel.
During a helical scan of the CT machine, the source 203, the aperture 204 and the detector 207 are rotated about the axis of rotation 202 in the direction indicated by arrow 208. During the rotation, the line-out position (also called View) of the radiation source 203 is constantly changing. Each payoff position corresponds to a plurality of receive channels on the detector 207.
As a specific implementation mode, the step can obtain the predicted attenuation information of the non-pay-off position by using the attenuation information of the receiving channel of the pay-off position according to the reversibility of the optical path. It should be noted that the receiving channel of the paid-out position is opposite to the receiving channel of the non-paid-out position.
It should be noted that different tissues of the scanned object have their respective attenuation coefficients, and the attenuation information is an integral value of the attenuation coefficients on the path traveled by the ray. The value received by the detector of the CT machine is subjected to air correction to obtain a numerical value which is attenuation information.
In order to understand the relationship between the pay-off position and the non-pay-off position, the principle of obtaining the predicted attenuation information of the non-pay-off position of the scanned object in this step is described below with reference to the pay-off position and the route from the pay-off position to the corresponding receiving channel of the CT machine shown in fig. 3.
Fig. 3 is a schematic scanning diagram of a CT scanner according to the present embodiment. As shown in fig. 3, during a CT scan, the scanned object 301 is scanned along the illustrated rotational direction. In FIG. 3, View k and View j are paid-out positions, and View i is a paid-out position. The View k, the View j and the View i are exemplary pay-off positions, and when the CT machine actually scans and works, a plurality of pay-off positions are arranged between every two of the View k, the View j and the View i. Since View k and View j are already paid-out positions, it can be known that in the example of fig. 3, other pay-out positions between the small segments of arcs where View k and View j are located are also already paid-out positions.
As an example, the detector opposite the radiation source has a first receiving channel, a second receiving channel, a third receiving channel, a fourth receiving channel and a fifth receiving channel. In fig. 3, the paths between the radiation source and the first, second, third, fourth and fifth receive channels are represented by rays c1, c2, c3, c4 and c5, respectively. It should be noted that the first to fifth receiving channels are only examples, and in practical applications, the number of receiving channels on the detector opposite to the radiation source is more than 5.
As can be seen from FIG. 3, the ray c1 corresponding to View k and the ray c5 corresponding to View i are approximately in the same straight line, and based on the reversibility of the optical path, the path of c1 of the radiation source at the paid-out position View k is similar to the path of c5 of the radiation source at the paid-out position View i. Similarly, ray c4 for View j is approximately collinear with ray c2 for View i, and thus, c4 of the radiation source at View j in the paid-out position is similar to c2 of the radiation source at View i in the non-paid-out position.
It will be appreciated that there are other payoff positions beyond View k and View j, and that the paths of the radiation source to the receive channel at the other payoff positions are similar to c1, c3, and c4, respectively, of the radiation source at the non-payoff position View i. It will thus be appreciated that for each undelivered position, there are a plurality of deployed positions similar to their paths to the respective receiving channels.
For the understanding of the present step, the following description will take the example of obtaining the predicted attenuation information of c5 of View i of the scanned object.
Since the path of the c1 of the radiation source at the paid-out position View k is similar to the path of the c5 of the radiation source at the non-paid-out position View i, the attenuation information of the c1 of the scanned object 301 at the paid-out position View k can be used as the predicted attenuation information of the c5 of the scanned object 301 at the non-paid-out position View i. The predicted attenuation information of the other receive channel paths (c1, c2, c3, c4, etc.) of the scan object View i are obtained in a similar manner to the above example, and are not described again here.
Step 102: and obtaining the receiving value range of the receiving channel at the non-paying-off position according to the predicted attenuation information and the known scanning dose, wherein each paying-off position corresponds to a plurality of receiving channels.
The received value specifically refers to a value received by a detector of the CT machine. The embodiment provides a specific implementation manner for obtaining the receiving value of the receiving channel at the position without paying off, which is shown in the following formula (1):
I＝I0expression (1) of x exp (-ul)
In the formula (1), I represents the receiving value of the receiving channel at the position of non-line-laying, I0Representing the received value, I, of a known scan dose after passing through a shape filter 0Ul represents the predicted attenuation information for the non-line-emitting position of the scanned object to the receive channel, relative to a filter of known dose size and shape.
After the step 101 is executed, the predicted attenuation information of each receiving channel at the position where the object is not paid off can be obtained, and then the receiving values of each receiving channel at the position where the object is not paid off can be obtained according to the formula (1), and the receiving value range of the receiving channel at the position where the object is not paid off can be determined according to the maximum receiving value and the minimum receiving value.
For example, the receiving values of the five receiving channels of the non-pay-off position View i are: I.C. A1，I2，I3，I4And I5Wherein，I4Is the maximum received value, I3The minimum receiving value is, the receiving value range of the receiving channel capable of obtaining View I is [ I3,I4]。
Step 103: and adjusting the gear of the integrating capacitor according to the receiving value range.
The integrating capacitor generally has a plurality of shift positions, and each shift position corresponds to a different range.
The received value needs to be digitized when displayed, and the upper limit of the display is N as an example. Due to different ranges of gears, the received value needs to be amplified by the amplification factor corresponding to the gear when being displayed. For example, the first gear corresponds to the magnification K1, the second gear corresponds to the magnification K2, and the third gear corresponds to the magnification K3.
As an optional implementation manner, the maximum receiving value in the receiving value range of the receiving channel at the non-line-releasing position obtained in step 102 may be multiplied by the amplification factor corresponding to different gears of the integrating capacitor to obtain a plurality of products, and the gear corresponding to the product whose value is smaller than the displayed upper limit N and closest to N in each product is taken as the gear to be adjusted. For example, the maximum reception value is I by using the formula (1)4Is shown by4Multiplying by K1, K2 and K3 respectively to obtain products of N1, N2 and N3, where N2 is closest to N and is less than N, so step 103 adjusts the shift position of the integrating capacitor to the second shift position if the shift position of the integrating capacitor is not the second shift position.
The above is merely an exemplary embodiment of the present embodiment that adjusts the shift position of the integrating capacitor according to the received value range. It is understood that other ways may also be used to adjust the shift position of the integrating capacitor according to the receiving value range, for example, after the maximum receiving value in the receiving value range is multiplied by a preset coefficient and compared with the measuring range corresponding to each shift position, the shift position of the integrating capacitor is adjusted. In the embodiment of the present application, a specific implementation manner of step 103 is not limited.
The method for adjusting the capacitor gear provided by the embodiment includes the steps of firstly obtaining predicted attenuation information of a non-pay-off position of a scanned object according to attenuation information of a pay-off position of the scanned object; then, according to the predicted attenuation information and the known scanning dose, obtaining a receiving value range of a receiving channel at a non-paying-off position, wherein each paying-off position corresponds to a plurality of receiving channels; and finally, adjusting the gear of the integrating capacitor according to the receiving value range.
Since the receiving channel of the undelivered position and the receiving channel of the paid-out position have similar paths through the scanned object, the attenuation information of the paid-out position can be used for predicting the attenuation information of the undelivered position. According to the receiving value range of the receiving channel at the position where the wire is not paid off, the required integral capacitance range can be obtained, and then the required integral capacitance gear is determined according to the required integral capacitance range. Therefore, compared with the prior art, the method and the device have the advantages that the proper integral capacitor gear is finally determined through predicting the attenuation information of the position where the wire is not paid off to adjust, the accuracy of measured data can be improved by using the integral capacitor after the gear is adjusted, and the imaging quality of the CT machine is further improved.
It should be noted that, in this embodiment, the paid-off position of the scanned object may be scanned by using an empirical integral capacitor gear, so as to obtain attenuation information of the paid-off position of the scanned object. For example, in the process of scanning an object for one full circle, the first half circle is performed by using an empirical integral capacitor gear to obtain attenuation information of each paid-off position in the scanning process of the first half circle; and predicting the attenuation information of a plurality of non-paying-off positions of the rear half circle based on the attenuation information of each paying-off position of the front half circle to obtain the predicted attenuation information of the non-paying-off positions. And finally, determining the receiving value range of the position without paying off by utilizing the predicted attenuation information of the position without paying off, and then adopting the adjusted integral capacitor gear when actually scanning the scanned object at the position without paying off in the second half circle.
Because the CT machine scans in a spiral mode, even if the paid-off position and the non-paid-off position in a whole circle range have different positions in the motion direction of the CT scanning bed. Therefore, the accuracy of obtaining the predicted attenuation information of the non-line-paying-off position by using the attenuation information of the receiving channel of the line-paying-off position needs to be further corrected only according to the reversibility of the optical path. Therefore, the application also provides another method for adjusting the capacitor gear. The method is described in detail below with reference to the figures and examples.
Second embodiment
Referring to fig. 4, it is a flowchart of a method for adjusting a shift position of a capacitor according to the present embodiment.
As shown in fig. 4, the method for adjusting the capacitive shift position according to the present embodiment includes:
step 401: and obtaining the predicted attenuation information of the position of the scanned object without paying off according to the attenuation information of the paid-off position of the scanned object.
In this embodiment, step 401 is the same as that of step 101 in the previous embodiment, and the related description of step 401 may refer to the previous embodiment, which is not repeated herein.
Referring to fig. 4a, the figure is a schematic view of a helical scan of a CT machine. As shown in FIG. 4a, the scanning bed moves along the Z direction, and the Z-direction section of each pay-off position on the spiral line is different. Therefore, the non-pay-off position is different from the Z-direction section of the pay-off position, namely the Z-direction position is different. Due to the difference in the Z-direction position, the path of the radiation beam received by each receiving channel in the non-line-laying position is not absolutely the same as the path of the radiation beam received by the receiving channel in the opposite line-laying position. Therefore, it is not accurate to use the attenuation value of the receiving channel at the paid-out position as the predicted attenuation value of the receiving channel at the opposite non-paid-out position.
For this purpose, the predicted attenuation information of the non-paying-off position obtained in this step is corrected in the following steps 402 to 403.
Step 402: and obtaining first attenuation information of the paid-off position in the Z direction according to the scanned plain film information, and obtaining second attenuation information of the non-paid-off position in the Z direction according to the scanned plain film information.
The Z direction is the motion direction of the CT scanning bed. In this embodiment, the flatting can be performed on the scanned object in advance to obtain the flatting information. According to the attenuation areas of all the Z-direction positions in the plain film information, water modes with the same or similar attenuation areas can be equivalently obtained. And then, obtaining equivalent water models corresponding to all the sections in all the Z directions according to the plain film information.
First attenuation information of the paid-off position in the Z direction, specifically attenuation information of an equivalent water model corresponding to the Z-direction section where the paid-off position is located; and second attenuation information of the non-pay-off position in the Z direction, specifically attenuation information of an equivalent water model corresponding to the Z-direction section where the non-pay-off position is located.
Taking the paid-out position View k and the non-paid-out position View i illustrated in fig. 3 and 4a as examples, the paid-out position View k and the non-paid-out position View i have different positions in the Z direction, and the position of the paid-out position View k in the Z direction is Z kThe position of the non-pay-off position View i in the Z direction is Zi. Obtaining Z according to the scanned plain film informationkAttenuation area S of positionkAnd ZiAttenuation area S of a locationi. Attenuation area SkThe attenuation information of the water model is AZkTherefore AZkThe first attenuation information of the paid-off position View k in the Z direction is obtained; attenuation area SiThe attenuation information of the water model is AZiTherefore AZiNamely second attenuation information of the non-pay-off position View i in the Z direction.
Step 403: and correcting the predicted attenuation information of the non-line-paying-off position by using the first attenuation information and the second attenuation information.
In conjunction with the foregoing example, the present embodiment provides a specific implementation manner of correcting the predicted attenuation information of the non-pay-off position by using the first attenuation information and the second attenuation information, which is shown in the following formula (2):
ulre1＝ul*(AZi/AZk) Formula (2)
In the above formula (2), ul represents the predicted attenuation information of the fifth receiving channel of the non-payoff position View i obtained in step 401, ulre1The corrected predicted attenuation information, AZ, of the fifth receiving channel representing the non-payoff position View ikFirst attenuation information AZ representing the Z direction of the paid-out position View kiAnd second attenuation information of the non-pay-off position View i in the Z direction is shown.
Since ul in equation (2) is the attenuation of the first receive channel from the paid-out position View kPosition Z of paid-out position View k in Z direction obtained by informationkPosition Z in Z direction with non-pay-off position View iiAre not identical, so ul is obtained after correction of equation (2)re1Is a Z-direction position Z from the non-pay-off position View iiMutually matched predicted attenuation information. Further, ulre1Compared with ul, the method has higher accuracy.
It should be noted that the physical meanings of the parameters in the above formula (2) are only the physical meanings exemplified in connection with fig. 3. In practical applications, each parameter in the formula (2) has a wider physical meaning: ul is the predicted attenuation information of the uncorrected position of the pay-off line, ulre1Is predicted attenuation information after correction of the position of the pay-off line, AZkFirst attenuation information, AZ, in the Z direction at the paid-off positioniSecond attenuation information in the Z direction for the undeployed position is referred to.
Step 404: and obtaining the receiving value range of the receiving channel at the non-paying-off position according to the corrected predicted attenuation information and the known scanning dose, wherein each paying-off position corresponds to a plurality of receiving channels.
Step 405: and adjusting the gear of the integrating capacitor according to the receiving value range.
In this embodiment, the implementation manners of steps 404 and 405 are the same as the implementation manners of steps 102 and 103 in the foregoing embodiment, respectively. The only difference is that the predicted attenuation information applied in steps 404 and 405 of this embodiment is specifically the predicted attenuation information corrected by this embodiment. Therefore, the related descriptions of steps 404 and 405 can be referred to the foregoing embodiments specifically, and are not repeated herein.
The above is the method for adjusting the capacitor shift according to the embodiment. The method is based on the mismatching problem of the predicted attenuation information of the position where the pay-off is not carried out and the position in the Z direction where the position where the pay-off is not carried out actually, first attenuation information of the position where the pay-off is carried out in the Z direction and second attenuation information of the position where the pay-off is not carried out in the Z direction are obtained according to scanned plain film information, and the predicted attenuation information of the position where the pay-off is not carried out is corrected by utilizing the first attenuation information and the second attenuation information. And then obtaining the receiving value range of the receiving channel at the position without paying off by using the corrected predicted attenuation information, and finally adjusting the gear of the integrating capacitor according to the receiving value range.
Since the accuracy of the predicted attenuation information is improved after correction, the accuracy of the obtained reception value range is also improved. Furthermore, the matching degree of the integrating capacitor gear selected by utilizing the high-accuracy receiving value range and the actual receiving value is higher, the data measurement is more accurate, and the imaging quality of the CT machine is further improved.
The predicted attenuation information of the non-line-release position obtained by the previous embodiment is already relatively similar to the actual attenuation information of the non-line-release position in phase and amplitude, but a prediction error still exists. According to research, prediction errors of adjacent or similar non-pay-off positions are very close, for example, the prediction error between the predicted attenuation information and the actual attenuation information of the pay-off position View i-1 and the prediction error between the predicted attenuation information and the actual attenuation information of the non-pay-off position View i are respectively adjacent pay-off positions in the scanning rotation direction of the CT machine, and the prediction error between the predicted attenuation information and the actual attenuation information of the pay-off position View i is very close. Based on this, the application also provides another method for correcting the predicted attenuation information to adjust the gear of the integrating capacitor. The method is described in detail below with reference to the figures and examples.
Third embodiment
Referring to fig. 5, it is a flowchart of a method for adjusting a shift position of a capacitor according to this embodiment.
As shown in fig. 5, the method for adjusting the capacitive shift position according to the present embodiment includes:
step 501: and obtaining the predicted attenuation information of the position of the scanned object without paying off according to the attenuation information of the paid-off position of the scanned object.
In this embodiment, step 501 is the same as that of step 101 in the previous embodiment, and the related description of step 501 may refer to the previous embodiment, which is not repeated herein.
The error between the predicted attenuation information and the actual attenuation information for the payoff position is called the prediction error. It was found that the prediction errors of adjacent or nearby payoff positions are very close. Therefore, in the method for correcting the predicted attenuation information provided in this embodiment, the predicted attenuation information of the non-line-release position is corrected by using the prediction error of the line-release position adjacent to the non-line-release position.
The process of correcting the predicted attenuation information for the non-line-release position is described in detail below in connection with step 502.
Step 502: and correcting the predicted attenuation information of the non-paying-off position by using the predicted attenuation information of the paying-off position adjacent to the non-paying-off position and the actual attenuation information of the adjacent paying-off position.
In practical applications, the ratio of the actual attenuation information to the predicted attenuation information for the paid-out position may be used to characterize the prediction error coefficient for the paid-out position. Since the prediction errors of adjacent or close pay-off positions are very close, the corrected predicted attenuation information very close to the actual attenuation information of the un-pay-off position can be obtained by using the prediction error coefficient of the paid-off position and the predicted attenuation information of the adjacent un-pay-off position. Solving the corrected predicted attenuation information of the non-pay-off position according to the following formula (3):
ulre2(i)＝uli*(ul′i-1/uli-1) Formula (2)
Ul in the formula (3)i-1And uliRespectively represents the predicted attenuation information ul of the paid-out position Viewi-1 and the non-paid-out position Viewi obtained in the step 501i′-1Represents the actual attenuation information, ul, of View i-1re2(i)And the predicted attenuation information after correcting the non-pay-off position View i is shown. Note that View i-1 is the paid-out position adjacent to the non-paid-out position View i.
In the formula (3), (ul)i′-1/uli-1) And a prediction error coefficient representing the predicted attenuation information and the actual attenuation information of the paid-out position View i-1. In this embodiment, because View i-1 is the paid-off position adjacent to the non-paid-off position View i, the prediction error coefficient of the prediction attenuation information and the actual attenuation information of the paid-off position View i-1 and the prediction attenuation of the non-paid-off position View i are usedSubtracting the information, multiplying to obtain a product ulre2(i)Equivalent to passing through the prediction error coefficient (ul)i′-1/uli-1) And corrected predicted attenuation information which is closer to actual attenuation information of the non-pay-off position View i.
Step 503: and obtaining the receiving value range of the receiving channel at the non-paying-off position according to the corrected predicted attenuation information and the known scanning dose, wherein each paying-off position corresponds to a plurality of receiving channels.
Step 504: and adjusting the gear of the integrating capacitor according to the receiving value range.
In this embodiment, the implementation manners of steps 503 and 504 are the same as the implementation manners of steps 102 and 103 in the foregoing embodiment, respectively. The only difference is that the predicted attenuation information applied in steps 503 and 504 of this embodiment is specifically the predicted attenuation information corrected by this embodiment. Therefore, the description of steps 503 and 504 can refer to the foregoing embodiments specifically, and is not repeated here.
The above is a method for adjusting a shift position of a capacitor provided in the embodiment of the present application. Since the prediction error of the predicted attenuation information of the adjacent pay-off position is relatively close, the method provided by the embodiment corrects the predicted attenuation information of the pay-off position adjacent to the pay-off-not position by using the predicted attenuation information of the pay-off position adjacent to the pay-off-not position and the actual attenuation information of the adjacent pay-off position. The corrected predicted attenuation information is closer to the actual attenuation information of the non-line-paying-off position, namely the accuracy is improved, so that the accuracy of the obtained receiving value range is also improved. Furthermore, the matching degree of the integrating capacitor gear selected by utilizing the high-accuracy receiving value range and the actual receiving value is higher, the data measurement is more accurate, and the imaging quality of the CT machine is further improved.
The methods for adjusting the capacitance step provided in the second embodiment and the third embodiment of the present application respectively correct the predicted attenuation information. It can be understood that the methods for correcting the predicted attenuation information provided in the second embodiment and the third embodiment may also be combined with each other to implement comprehensive correction of the predicted attenuation information, so as to improve the accuracy of the predicted attenuation information and reduce the prediction error between the corrected predicted attenuation information and the actual attenuation information. In this application, the specific order of correcting the predicted attenuation information by using the correction methods provided in the second and third embodiments is not limited.
The method of adjusting the capacitive steps of the above embodiments may be performed by a control apparatus. The following describes a control device for adjusting a shift position of a capacitor provided by the present application in detail with reference to the accompanying drawings and embodiments.
Fourth embodiment
Referring to fig. 6, the diagram is a hardware structure diagram of the control device for adjusting the capacitor shift position provided by the present application.
As shown in fig. 6, the control apparatus provided in the present embodiment includes:
a processor 601, a communication interface 602, a memory 603, and a bus 604. The processor 601, the communication interface 602 and the memory 603 communicate with each other via the bus 604.
The memory 603 may store logic instructions for adjusting the capacitance step, and the memory may be a non-volatile memory, for example. The processor 601 may invoke logic instructions executing the logic instructions for adjusting the capacitive steps in the memory 603 to perform the method for adjusting the capacitive steps provided by the foregoing embodiments. As an implementation manner, the logic instruction for adjusting the gear position of the capacitor may be a program corresponding to the control software, and when the program is executed by the processor 601, part or all of the steps of the method for adjusting the gear position of the capacitor as claimed in the foregoing embodiments are implemented. At this time, as a possible implementation manner, the control device may correspondingly display a function interface corresponding to the instruction on the display interface.
The function of the logic instructions for adjusting the gear position of the capacitor, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions disclosed in the present application may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method provided in the first embodiment of the present application.
The present application further provides a computer readable storage medium, on which a program is stored, where the program, when executed by a processor, implements some or all of the steps of the method for adjusting a shift position of a capacitor as claimed in the previous embodiment of the present application. The storage medium may include: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The logic instruction for adjusting the capacitive shift position may be referred to as a "device for adjusting the capacitive shift position", and the device may be divided into various functional units or modules. See in particular the examples below.
Based on the method for adjusting the gear position of the capacitor provided by the embodiment, in order to solve the problems in the prior art, the application further provides a device for adjusting the gear position of the capacitor. The device is described in detail below with reference to the figures and examples.
Fifth embodiment
Referring to fig. 7, the drawing is a schematic structural diagram of a device for adjusting a shift position of a capacitor according to this embodiment.
As shown in fig. 7, the apparatus for adjusting a shift position of a capacitor according to this embodiment includes: an attenuation information prediction module 701, a received value range acquisition module 702, and a capacitance step adjustment module 703.
The attenuation information predicting module 701 is configured to obtain predicted attenuation information of a position where the scanned object is not paid off according to attenuation information of a position where the scanned object is paid off;
a received value range acquisition module 702, configured to acquire a received value range of a receiving channel at a non-line-release position according to the predicted attenuation information and the known scanning dose; each pay-off position corresponds to a plurality of receiving channels;
and a capacitor shift adjusting module 703, configured to adjust a shift of the integrating capacitor according to the received value range.
The above is the device for adjusting the gear position of the capacitor provided by this embodiment. Since the receiving channel of the undelivered position and the receiving channel of the paid-out position have similar paths through the scanned object, the attenuation information of the paid-out position can be used for predicting the attenuation information of the undelivered position. According to the receiving value range of the receiving channel at the position where the wire is not paid off, the required integral capacitance range can be obtained, and then the required integral capacitance gear is determined according to the required integral capacitance range. Therefore, compared with the prior art, the method and the device have the advantages that the proper integral capacitor gear is finally determined through predicting the attenuation information of the position where the wire is not paid off to adjust, the accuracy of measured data can be improved by using the integral capacitor after the gear is adjusted, and the imaging quality of the CT machine is further improved.
As an optional implementation manner, in the device for adjusting a shift position of a capacitor provided in this embodiment, the attenuation information predicting module 701 specifically includes:
and the first prediction unit is used for obtaining the predicted attenuation information of the non-line-paying-off position by using the attenuation information of the receiving channel of the line-paying-off position according to the reversibility of the optical path. It should be noted that the receiving channel of the paid-out position is opposite to the receiving channel of the non-paid-out position.
As an optional implementation manner, in the device for adjusting a shift position of a capacitor provided in this embodiment, the capacitor shift position adjusting module 703 specifically includes: the device comprises a maximum receiving value acquisition unit and a capacitance gear adjustment unit.
The maximum receiving value acquiring unit is used for acquiring a maximum receiving value from a receiving value range;
and the capacitor gear adjusting unit is used for adjusting the gear of the integrating capacitor according to the maximum receiving value.
Because the scanning process of the CT machine is scanned in a spiral mode, even if the paid-out position and the non-paid-out position in a whole circle range exist, the position in the moving direction of the CT scanning bed is different. Therefore, the accuracy of obtaining the predicted attenuation information of the non-line-paying-off position by using the attenuation information of the receiving channel of the line-paying-off position is required to be further corrected only according to the reversibility of the optical path.
In order to correct the predicted attenuation information, the apparatus for adjusting the capacitor shift according to this embodiment may further include: the device comprises an attenuation information acquisition module and a first correction module.
The attenuation information acquisition module is used for acquiring first attenuation information of the paid-off position in the Z direction according to the scanned plain film information and acquiring second attenuation information of the non-paid-off position in the Z direction according to the scanned plain film information; the Z direction is the motion direction of the CT scanning bed;
and the first correction module is used for correcting the predicted attenuation information of the non-paying-off position by utilizing the first attenuation information and the second attenuation information.
The attenuation information acquisition module and the first correction module acquire first attenuation information of the paid-off position in the Z direction and second attenuation information of the paid-off position in the Z direction according to the scanned plain film information based on the mismatching problem of the predicted attenuation information of the paid-off position and the position of the non-paid-off position in the Z direction, and the predicted attenuation information of the paid-off position is corrected by using the first attenuation information and the second attenuation information. The received value range obtaining module 702 obtains the received value range of the receiving channel at the position where the wire is not paid off by using the predicted attenuation information corrected by the attenuation information obtaining module and the first correction module; the capacitance shift adjustment module 703 adjusts the shift of the integrating capacitance according to the received value range.
Since the accuracy of the predicted attenuation information is improved after correction, the accuracy of the received value range obtained by the received value range obtaining module 702 is also improved. Furthermore, the matching degree between the integration capacitor gear selected by the capacitor gear adjusting module 703 by using the high-accuracy receiving value range and the actual receiving value is higher, the data measurement is more accurate, and the imaging quality of the CT machine is further improved.
According to research, prediction errors of adjacent or similar non-pay-off positions are very close, for example, the prediction error between the predicted attenuation information and the actual attenuation information of the pay-off position View i-1 and the prediction error between the predicted attenuation information and the actual attenuation information of the non-pay-off position View i are respectively adjacent pay-off positions in the scanning rotation direction of the CT machine, and the prediction error between the predicted attenuation information and the actual attenuation information of the pay-off position View i is very close. In order to further improve the accuracy of predicting the attenuation information, the apparatus for adjusting the capacitor shift according to this embodiment may further include:
and the second correction module is used for correcting the predicted attenuation information of the position without paying off by utilizing the predicted attenuation information of the position with paying off, which is adjacent to the position without paying off, and the actual attenuation information of the position with paying off, which is adjacent to the position with paying off.
Since the prediction error of the predicted attenuation information of the adjacent pay-off position is relatively close, the second correction module in the device provided by the embodiment corrects the predicted attenuation information of the pay-off position adjacent to the pay-off-free position by using the predicted attenuation information of the pay-off position adjacent to the pay-off-free position and the actual attenuation information of the adjacent pay-off position. The received value range obtaining module 702 obtains the received value range of the receiving channel at the position where the line is not paid off by using the predicted attenuation information corrected by the second correcting module; the capacitance shift adjustment module 703 adjusts the shift of the integrating capacitance according to the received value range.
The corrected predicted attenuation information is closer to the actual attenuation information of the non-line-releasing position, that is, the accuracy is improved, so that the accuracy of the received value range obtained by the received value range obtaining module 702 is also improved. Furthermore, the matching degree between the integration capacitor gear selected by the capacitor gear adjusting module 703 by using the high-accuracy receiving value range and the actual receiving value is higher, the data measurement is more accurate, and the imaging quality of the CT machine is further improved.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The foregoing is illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (11)
1. A method for adjusting a capacitor gear is applied to CT scanning, and comprises the following steps:
obtaining the predicted attenuation information of the position where the scanned object is not paid off according to the attenuation information of the paid off position of the scanned object;
obtaining the receiving value range of the receiving channel at the position without paying off according to the predicted attenuation information and the known scanning dose; each pay-off position corresponds to a plurality of receiving channels;
And adjusting the gear of the integrating capacitor according to the receiving value range.
2. The method for adjusting a capacitive tap position according to claim 1, wherein the obtaining of the predicted attenuation information of the non-line-releasing position of the scanned object according to the attenuation information of the line-releasing position of the scanned object specifically comprises:
and according to the reversibility of the optical path, obtaining the predicted attenuation information of the non-line-paying-off position by using the attenuation information of the receiving channel at the line-paying-off position, wherein the receiving channel at the line-paying-off position is opposite to the receiving channel at the non-line-paying-off position.
3. The method for adjusting capacitive range according to claim 1, further comprising, before said obtaining a range of receive values for receive channels at said undelivered location based on said predicted attenuation information and a known scan dose:
obtaining first attenuation information of the paid-off position in the Z direction according to the scanned plain film information, and obtaining second attenuation information of the non-paid-off position in the Z direction according to the scanned plain film information; the Z direction is the motion direction of the CT scanning bed;
and correcting the predicted attenuation information of the non-line-paying-off position by using the first attenuation information and the second attenuation information.
4. The method for adjusting capacitive steps according to claim 1 or 3, further comprising, before obtaining a range of reception values corresponding to a reception channel of a line-delivering position based on the predicted attenuation information and the known dose of the line-not-delivering position:
and correcting the predicted attenuation information of the non-paying-off position by using the predicted attenuation information of the paying-off position adjacent to the non-paying-off position and the actual attenuation information of the adjacent paying-off position.
5. The method for adjusting the capacitive range according to claim 1, wherein the adjusting the range of the integrating capacitor according to the received value range specifically comprises:
obtaining a maximum receiving value from the receiving value range;
and adjusting the gear of the integrating capacitor according to the maximum receiving value.
6. An apparatus for adjusting a capacitance step, the apparatus comprising: the device comprises an attenuation information prediction module, a receiving value range acquisition module and a capacitance gear adjustment module;
the attenuation information prediction module is used for obtaining the predicted attenuation information of the position where the scanned object is not paid off according to the attenuation information of the paid-off position of the scanned object;
the receiving value range obtaining module is used for obtaining the receiving value range of the receiving channel at the position without paying off according to the predicted attenuation information and the known scanning dose; each pay-off position corresponds to a plurality of receiving channels;
And the capacitor gear adjusting module is used for adjusting the gear of the integrating capacitor according to the receiving value range.
7. The device for adjusting a capacitive tap position according to claim 6, wherein the attenuation information prediction module specifically comprises:
the first prediction unit is used for obtaining the prediction attenuation information of the non-line-paying-off position by using the attenuation information of the receiving channel of the line-paying-off position according to the reversibility of the optical path, wherein the receiving channel of the line-paying-off position is opposite to the receiving channel of the non-line-paying-off position.
8. The device for adjusting a capacitive tap position of claim 6, further comprising: the device comprises an attenuation information acquisition module and a first correction module;
the attenuation information acquisition module is used for acquiring first attenuation information of the paid-off position in the Z direction according to the scanned plain film information and acquiring second attenuation information of the paid-off position in the Z direction according to the scanned plain film information; the Z direction is the motion direction of the CT scanning bed;
the first correction module is used for correcting the predicted attenuation information of the non-paying-off position by using the first attenuation information and the second attenuation information.
9. The apparatus for adjusting a capacitive tap position according to claim 6 or 8, further comprising:
and the second correction module is used for correcting the predicted attenuation information of the non-paying-off position by using the predicted attenuation information of the paying-off position adjacent to the non-paying-off position and the actual attenuation information of the adjacent paying-off position.
10. The device for adjusting the capacitive shift according to claim 6, wherein the capacitive shift adjusting module specifically comprises: the device comprises a maximum receiving value acquisition unit and a capacitance gear adjustment unit;
the maximum received value acquiring unit is configured to acquire a maximum received value from the received value range;
and the capacitance gear adjusting unit is used for adjusting the gear of the integrating capacitor according to the maximum receiving value.
11. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method of adjusting a capacitive shift position according to any one of claims 1 to 5.
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