CN110664419A - Method and device for determining scanning field of view, terminal equipment and CT system - Google Patents
Method and device for determining scanning field of view, terminal equipment and CT system Download PDFInfo
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- CN110664419A CN110664419A CN201910867268.8A CN201910867268A CN110664419A CN 110664419 A CN110664419 A CN 110664419A CN 201910867268 A CN201910867268 A CN 201910867268A CN 110664419 A CN110664419 A CN 110664419A
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Abstract
The application discloses a method and a device for determining a scanning visual field, terminal equipment and a CT system. The method comprises the following steps: the method comprises the steps of determining the data transmission capacity of the CT system, determining the number of detection units capable of being transmitted on a detector under the condition that the data transmission capacity is met, and determining the scanning visual field of the CT system according to the number of the detection units capable of being transmitted, so that the CT system is capable of transmitting data scanned in the scanning visual field, the situations of data congestion and data loss are avoided, the required CT image can be reconstructed, and the system availability is high.
Description
Technical Field
The present disclosure relates to the technical field of medical devices, and in particular, to a method and an apparatus for determining a scanning field of view, a terminal device, and a CT system.
Background
CT (Computed Tomography) is one of the advanced large-scale medical diagnostic imaging technologies today, has a high application value in clinical medicine, and can be used for examination of various diseases.
With the development of the CT technology, the rotating speed of the gantry is continuously increased, the scanning speed of the CT system is increased, the number of the detection units is continuously increased, and the data volume of one-time data acquisition is increased, so that the requirement on the data transmission speed of the CT system is continuously increased.
If the scan data acquisition speed is higher than the scan data transmission speed, the scan data is jammed and lost in the transmission process, the CT system cannot reconstruct the required CT image, and the system availability is poor.
Disclosure of Invention
In order to overcome the problems in the related art, the specification provides a method, a device and a terminal device for determining a scanning field of view.
Specifically, the method is realized through the following technical scheme:
in a first aspect, a method for determining a scanning field of view is provided, which is applied to a CT system, and includes:
determining data transmission capability of the CT system;
determining the number of detection units capable of being transmitted on the detector under the condition of meeting the data transmission capacity;
and determining the scanning field of view of the CT system according to the quantity of the detection units capable of being transmitted.
In a second aspect, an apparatus for determining a scan field of view is provided, which is applied to a CT system, the apparatus comprising:
a first determination module configured to determine data transmission capabilities of the CT system;
the second determination module is configured to determine the number of the detection units capable of being transmitted on the detector under the condition that the data transmission capability is met;
a third determination module configured to determine a scanning field of view of the CT system based on the number of transmittable detection units.
In a third aspect, a terminal device is provided, including: the system comprises an internal bus, a memory, a processor and an external interface which are connected through the internal bus; wherein the content of the first and second substances,
the external interface is used for acquiring data;
the memory for storing corresponding machine readable instructions for determining a scan field of view;
the processor is configured to read the machine-readable instructions on the memory and perform the following operations:
determining data transmission capability of the CT system;
determining the number of detection units capable of being transmitted on the detector under the condition of meeting the data transmission capacity;
and determining the scanning field of view of the CT system according to the quantity of the detection units capable of being transmitted.
In a fourth aspect, a CT system is provided, comprising: the system comprises a ray source, a detector and terminal equipment, wherein the ray source is used for emitting rays, the detector is used for detecting attenuated rays after the rays penetrate through different tissues, and the intensity of the attenuated rays is converted into an electric signal to be transmitted to the terminal equipment;
the terminal device is used for determining the data transmission capability of the CT system; determining the number of detection units capable of being transmitted on the detector under the condition of meeting the data transmission capacity; and determining the scanning field of view of the CT system according to the quantity of the detection units capable of being transmitted.
The technical scheme provided by the embodiment of the specification can have the following beneficial effects:
in the embodiment of the specification, the number of the detection units capable of being transmitted on the detector is determined under the condition that the data transmission capability of the CT system is met, and the scanning visual field of the CT system is determined according to the number of the detection units capable of being transmitted, so that the CT system is capable of transmitting data scanned in the scanning visual field, the situations of data congestion and data loss are avoided, a required CT image can be reconstructed, and the system availability is high.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the specification.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present specification and together with the description, serve to explain the principles of the specification.
FIG. 1 is a schematic diagram of an application scenario of a CT system;
FIG. 2 is a flow chart illustrating a method of determining a scan field of view in accordance with an exemplary embodiment of the present application;
FIG. 3 is a flow chart illustrating another method of determining a scan field of view according to an exemplary embodiment of the present application;
FIG. 4 is a flow chart illustrating another method of determining a scan field of view according to an exemplary embodiment of the present application;
FIG. 5 is a schematic diagram of a detector in the CT system shown in FIG. 1;
FIG. 6 is a flow chart illustrating another method of determining a scan field of view according to an exemplary embodiment of the present application;
FIG. 7 is a schematic cross-sectional view of the detector along the X-direction;
FIG. 8 is a schematic diagram illustrating an apparatus for determining a scan field of view in accordance with an exemplary embodiment of the present application;
fig. 9 is a schematic structural diagram of a terminal device according to an exemplary embodiment of the present application;
fig. 10 is a schematic structural diagram of a CT system according to an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present specification. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the specification, as detailed in the appended claims.
Referring to fig. 1, a schematic view of an application scenario of the CT system is shown. The CT system may include a CT device 10 and a terminal device 20. The CT apparatus 10 may include a radiation source (e.g., a bulb 11), a detector 12, a gantry 13, and a scanning bed 14, wherein the bulb 11 and the detector 12 are oppositely disposed in the gantry 13, and the scanning bed 14 may drive an object to be detected to move into the annular gantry 13 for scanning.
As shown in fig. 1, the detector 12 may be an arc detector, where the arc detector 12 includes a plurality of detection units arranged in a matrix, and the detection units are configured to detect the radiation attenuated by the detected object, convert the radiation into a pulse signal, and transmit the pulse signal to the terminal device 20.
In the CT helical scanning and sampling process, the scanning bed 14 drives the detected object to the rack 13, the detector 12 and the bulb tube 11 rotate helically, and the scanning bed moves axially and horizontally, that is, the detector rotates circumferentially and rotates axially relative to the scanning bed at the same time, the detector 12 samples after rotating a preset angle, the sampling position is called a sampling point, the detector 12 performs ray detection at the sampling point, and transmits a pulse signal generated based on the detected ray to the terminal device 20, thereby completing the detection of the whole detection part according to the method. The size of the preset angle can be set according to the actual situation.
During the process of acquiring X-ray data, the detector transmits the acquired image data to the console in real time, so that the data acquisition and the data transmission of the CT system are almost completed at the same time. In the process of scanning the detection part of the CT system, the detector and the bulb tube rotate at a high speed relative to the scanning bed, so that the total detection time of the CT system on the detection part is shorter under the general condition. However, in some cases, a large amount of image data is often acquired by the detector during the scanning process, which results in that the CT system cannot transmit all the acquired data to the console within the total detection time of the detected part, and thus the acquired reconstruction data is incomplete when the console reconstructs the image, and an ideal reconstructed image cannot be obtained.
Therefore, the quantity of the collected image data is controlled by adjusting the scanning visual field range of the CT system, so that the CT system can smoothly transmit all the collected data to the console in the total detection time on the basis of the existing transmission capability, and the method is very necessary.
An embodiment of the present application for determining a scan field of view is described in detail below in conjunction with the CT system shown in FIG. 1.
Referring to fig. 2, a flow chart of one embodiment of a method for determining a scan field of view for the present application may include the steps of:
in step 101, the data transmission capability of the CT system is determined.
The data transmission capability of the CT system refers to the maximum data volume that the CT system can transmit within a preset time period. When the preset time length is the unit time, the data transmission capacity of the CT system is the data transmission speed of the CT system. The unit of the data amount may be a bit, a byte, or the like.
The CT system determines the data transmission capability at various times, for example, the CT system determines the data transmission capability before scanning the object to be detected, or the CT system may start to perform the operation of determining the data transmission capability according to the designated operation of the operator, for example, before the CT system scans the object to be detected, the terminal device in the CT system displays the image of the object to be detected, the doctor may select an image region to be scanned on the image through a mouse, that is, select a detection part to be scanned, and the CT system starts to perform the operation of determining the data transmission capability according to the operation selected by the doctor for the image region of the image.
In an alternative embodiment, referring to fig. 3, for a flowchart of another embodiment of the method for determining a scan field of view of the present application, step 101 may be implemented by:
in step 1011, the data transmission speed of the CT system is acquired.
In step 1012, the total detection time of the detector for one detection portion is obtained.
In step 1013, the data transmission speed and the total detection duration are multiplied to obtain an upper limit value of the data amount transmitted by the CT system in the total detection duration.
For step 1011, the data transmission speed of the CT system refers to the amount of data transmitted by the CT system per unit time. Under the condition of certain system parameters, the data transmission speed of the CT system is determined.
For step 1012, the total probing duration for one detection site may be: the time period required to complete the detection of the detection portion, or the total detection time period of one detection portion may be: and the sum of the time length required for completing the detection of the detection part and the delay time length, wherein the delay time length is the time length required for transmitting the collected and untransmitted data after the detection of the last sampling point is completed. The delay time period may be a value preset based on experience, and is generally small.
The total detection duration may be a duration corresponding to an integer number of rotations of the detector in the circumferential direction or a duration corresponding to a non-integer number of rotations of the detector, and may be determined according to the structure of the detection portion and the device parameters.
In step 1013, the upper limit value of the data volume transmitted by the CT system in the total detection duration is the maximum data volume that the CT system can transmit in the detection process of one detection region, that is, the data transmission capability of the CT system in the total detection duration. At one sampling point, the amount of data detected by each detection unit is 1.
In the implementation, when the detector completes detection of one detection part through one rotation, the total detection time of the detection part is the time of one rotation of the detector, and the upper limit value of the data volume is the maximum data volume which can be transmitted by the CT system in the process of one rotation of the detector.
In step 102, the number of detector units that can be transmitted on the detector is determined while satisfying the data transmission capability of the CT system.
The number of the detection units capable of transmitting refers to that, under the condition that the transmission capability of the system is certain, all the image data acquired by the detection units of the number can be transmitted to the terminal device 20 within the total detection duration. When the data transmission capability of the CT system is poor, the number of the detection units that can be transmitted on the detector is small, so that the CT system can smoothly transmit the data output by the small number of the detection units to the terminal device 20.
When the data transmission capability of the CT system is better, the number of the detection units that can be transmitted on the detector is larger, even equal to the number of all the detection units in the detector, and the CT system has the capability of smoothly transmitting the data output by the larger number of the detection units to the terminal device.
In an alternative embodiment, based on the method shown in fig. 3, referring to fig. 4, for a flowchart of another embodiment of the method for determining a scan field of view of the present application, step 102 may be implemented by: in step 1021, the number of detection units that can be transmitted when detecting the detection portion is determined according to the upper limit value of the data amount transmitted in the total detection time length determined in step 1013 and the number of sampling points of the detection portion by the detector.
When the CT system scans a detection part, the detector rotates in the circumferential direction and moves horizontally in the axial direction relative to the scanning bed, sampling is carried out after each rotation by a preset angle, and one detection part corresponds to a plurality of sampling points. The detection duration and the number of sampling points of the detection part can be set according to the actual situation, and different detection parts can have the same detection duration and the same number of sampling points or different detection durations and different numbers of sampling points.
In an alternative embodiment, referring to FIG. 5, a schematic diagram of the structure of the detector 12 in the CT system shown in FIG. 1 is shown, wherein the direction parallel to the length of the detection bed is defined as the Z direction, referred to in the art as the detector slice direction, and the direction perpendicular to the Z direction is defined as the X direction, referred to in the art as the detector channel direction in FIG. 5.
In the implementation, the number of the detection units in the X direction is larger than that of the detection units in the Z direction, and under the condition that the number of the detection units in the Z direction is not changed, the scanning visual field of the CT system is changed by changing the number of the detection units in the X direction. At this time, the CT system needs to determine the number of detection units that can transmit in the X direction while satisfying its own data transmission capability.
Referring to fig. 6, a flowchart of another embodiment of the method for determining a scan field of view according to the present application, step 1021, can be implemented as follows:
in step 1021-1, the actual number of detection units in the X-direction and the actual number of detection units in the Z-direction of the detector are acquired.
In step 1021-2, the upper limit value of the data volume transmitted in the total detection duration is divided by the number of sampling points of the detector for the detection part, so as to obtain the upper limit value of the number of detection units capable of being transmitted corresponding to one sampling point.
In step 1021-3, the upper limit of the number of detection units corresponding to one sampling point is divided by the actual number of detection units in the Z direction to obtain the upper limit of the number of detection units that can be transmitted in the X direction.
In step 1021-4, the upper limit of the number of detection units that can be transmitted in the X direction is compared with the actual number of detection units.
In step 1021-5, the number of probe units that can be transmitted in the X direction is determined based on the comparison.
For step 1021-1, the actual number of detection units in the X direction is the number of all detection units present in the X direction, and the actual number of detection units in the Z direction is the number of all detection units present in the Z direction.
For step 1021-2 and step 1021-3, the number of sampling points of a detection portion is the total number of sampling points required by the detector in the process of detecting the detection portion.
The upper limit value of the number of detection units that can be transmitted in the X direction can be calculated by the following formula (1):
wherein, TransmissionSpeed is the data transmission speed of the CT system; t is the total detection duration of one detection part; TransmissionsSpeed multiplied by T is an upper limit value of the data volume transmitted by the CT system in the total detection time; the nSlice is the number of all detection units existing in the Z direction; nViewPerRot is the total number of sample points used to probe a detection site.
With respect to step 1021-5, when the upper limit value of the number of detection units in the X direction is greater than or equal to the actual number of detection units in the X direction, it is determined that the actual number of detection units in the X direction is the number of detection units that can be transmitted in the X direction. At this time, the CT system has stronger data transmission capability and can smoothly transmit the data output by all the detection units in the X direction. For example, the upper limit value of the number of detection units in the X direction is 900, the actual number of detection units in the X direction is 800, and the number of X detection units that can transmit in the X direction is determined to be 800.
And when the upper limit value of the number of the detection units capable of being transmitted in the X direction is smaller than the actual number of the detection units in the X direction, determining that the upper limit value of the number of the detection units capable of being transmitted in the X direction is the number of the detection units capable of being transmitted in the X direction. At this time, the data transmission capability of the CT system is weak, and only the data output by some of the detecting units on the detector can be output smoothly. For example, the upper limit value of the number of probe units that can be transmitted in the X direction is 700, the actual number of probe units in the X direction is 800, and the number of probe units that can be transmitted in the X direction is 700.
In step 103, a scanning field of view of the CT system is determined based on the number of detector units that can be transmitted as determined in step 102. The scanning field of view of the CT system, i.e. the actually used scanning field of view, is abbreviated as actual scanning field of view, and in the present application, is determined according to a spatial region formed by a plurality of detecting units and radiation sources capable of transmitting in the detector 12, and is the scanning field of view when the CT system smoothly transmits data under its own data transmission capability.
On the basis of the method shown in fig. 6, when the upper limit value of the number of detection units that can be transmitted in the X direction is smaller than the actual number of detection units in the X direction, this step can be implemented by:
and determining the scanning visual field according to the number of the detection units capable of transmitting in the X direction, the distance from the emission source to the rotating center of the rack and the angular interval between two adjacent detection units capable of transmitting in the X direction.
The angular interval is an included angle formed between the two adjacent detection units capable of transmitting in the X direction and the emission source, and the emission source is a vertex of the included angle. The angular interval between two adjacent detection units capable of transmitting in the X direction can be calculated by the following formula (2):
the anglePerChannel is the angular interval between two adjacent detection units capable of transmitting in the X direction; fanAngle is the ray fan angle corresponding to the detector; nChannel is the number of detection units of all detection units present in the X direction.
The scanning field of view of the CT system can be obtained by the following equation (3):
ActualScanFov＝D×sin((nActualChannel-1)×0.5×anglePerChannel))×2 (3)
wherein, the actualscreenfov is the scanning field of view of the CT system; d is the distance from the emission source to the rotating center of the stander; nActualchannel is the number of detection units capable of transmitting in the X direction; the nglePerChannel is the angular separation of two adjacent detection units that can transmit in the X direction.
The scanning visual field commonly used in the CT industry refers to the diameter of a circular scanning visual field, and the area of the circular scanning visual field can be directly determined.
By using the above formula, the scanning field of view of the CT system can be calculated.
When the upper limit value of the number of the detection units capable of being transmitted in the X direction is greater than or equal to the number of the actual detection units in the X direction, nActualChannel in the formula (3) is replaced by nChannel, and the obtained scanning visual field is the physical scanning visual field of the CT system, namely the maximum scanning visual field of the CT system. The maximum scan field of view of the CT system may be determined in advance.
When the upper limit value of the number of the detection units capable of being transmitted in the X direction is smaller than the number of the actual detection units in the X direction, the detection units capable of being transmitted in the X direction are controlled to collect data, and the rest detection units in the X direction are controlled not to collect data.
Illustratively, referring to fig. 7, which is a schematic cross-sectional view of the detector along the X direction, in fig. 7, there are seven detecting units a in the X direction, the distance from the bulb b to the rotation center o of the gantry is D, the fan angle of the radiation corresponding to the detector is θ, the angular interval between two adjacent detecting units a is θ 1, a circle c1 is a physical scanning view on the XZ plane, the physical scanning view is a maximum scanning view determined according to all detecting units on the detector, a circle c2 is an actual scanning view on the XZ plane, the actual scanning view is a view determined according to the detector units capable of transmitting on the detector satisfying the data transmission capability, the circle c1 and the circle c2 are concentric, and the detector performs detecting and scanning using the actual scanning view corresponding to the circle c 2. In an alternative embodiment, in a scenario where the CT system displays an image of a detected object, receives a region selection operation for the image, and starts determining the data transmission capability of the CT system according to the region selection operation, step 103 may be implemented by:
a first step of determining the number of target detection units required for a target detection portion, which is a portion within an image area determined according to an area selection operation;
a second step of comparing the number of target detection units with the number of detection units determined in the step 102;
and a third step of determining the scanning visual field of the CT system according to the comparison result obtained in the second step.
For the third step, when the number of target detection units is greater than or equal to the number of detection units determined in step 102, determining the scanning field of view of the CT system according to the number of detection units determined in step 102; when the number of object detection units is smaller than the number of detection units determined in step 102, the scanning field of view of the CT system is determined according to the number of object detection units.
For example, a doctor uses a mouse to draw a frame on a leg region of a two-dimensional image of a patient, a CT system determines that the number of detection units required for detecting the leg position in the frame is M, and determines that the upper limit value of the number of detection units capable of being transmitted under the condition of meeting the data transmission capability of the CT system is N, wherein M, N is positive, and if M is judged to be greater than or equal to N, the scanning visual field of the CT system is determined according to N; and if the M is smaller than the N, determining the scanning visual field of the CT system according to the M.
Based on the setting of the plurality of steps, the CT system can adjust the scanning area and the scanning visual field selected by a doctor according to the number of the detection units which can be transmitted under the condition of meeting the data transmission capability of the CT system, thereby ensuring that the scanning data, namely the detection data, can be smoothly transmitted to the terminal equipment without scanning data loss.
Preferably, after the above steps are completed, the CT system may display a frame corresponding to the scan field of view on the image, where the frame displayed by the CT system is different from the frame selected by the doctor, so that the doctor can view and perform subsequent operations.
The execution sequence of each step in the flowcharts shown in fig. 2, 3, 4 and 6 is not limited to the sequence in the flowcharts. Furthermore, the description of each step may be implemented in software, hardware or a combination thereof, for example, a person skilled in the art may implement it in the form of software code, and may be a computer executable instruction capable of implementing the corresponding logical function of the step. When implemented in software, the executable instructions may be stored in a memory and executed by a processor in the system.
Corresponding to the embodiment of the method for determining the scanning field of view, the application also provides embodiments of a device for determining the scanning field of view, a terminal device and a CT system.
Referring to fig. 8, a block diagram of an embodiment of an apparatus for determining a scan field of view for the present application, which is applied to a CT system, may include: a first determination module 210, a second determination module 220, and a third determination module 230; wherein the content of the first and second substances,
the first determining module 210 configured to determine data transmission capability of the CT system;
the second determining module 220 is configured to determine the number of the detecting units capable of being transmitted on the detector when the data transmission capability is satisfied;
the third determining module 230 is configured to determine a scanning field of view of the CT system according to the number of transmittable detection units.
In an optional embodiment, the first determining module 210 may include: a first obtaining submodule, a second obtaining submodule and a multiplying submodule; wherein the content of the first and second substances,
the first acquisition sub-module is configured to acquire the data transmission speed of the CT system;
the second acquisition submodule is configured to acquire the total detection time of the detector for one detection part;
and the multiplying submodule is configured to multiply the data transmission speed and the total detection time length to obtain an upper limit value of the data volume transmitted by the CT system in the total detection time length.
In an alternative embodiment, the second determining module 220 may be configured to determine the number of detection units capable of transmitting when detecting the detection site according to the data amount upper limit value and the number of sampling points of the detector to the detection site.
In an optional embodiment, the second determining module 220 may include: the device comprises a first obtaining submodule, a first calculating submodule, a second calculating submodule, a first comparing submodule and a first determining submodule; wherein the content of the first and second substances,
the first obtaining sub-module is configured to, when the number of probe units capable of transmission includes: when the number of the detection units capable of being transmitted in the X direction is large, acquiring the actual number of the detection units of the detector in the X direction and the actual number of the detection units in the Z direction;
the first computing submodule is configured to divide the upper limit value of the data volume by the number of the sampling points to obtain the upper limit value of the number of the detection units which should be transmitted at one sampling point;
the second calculation submodule is configured to divide the upper limit value of the number of the detection units capable of being transmitted corresponding to the one sampling point by the actual number of the detection units in the Z direction to obtain the upper limit value of the number of the detection units capable of being transmitted in the X direction;
the first comparison submodule is configured to compare the upper limit value of the number of detection units capable of being transmitted in the X direction with the size of the number of actual detection units;
the first determining submodule is configured to determine the number of the detection units capable of being transmitted in the X direction according to a comparison result.
In an optional embodiment, the first determining sub-module may include: a first determination unit and a second determination unit; wherein the content of the first and second substances,
the first determination unit is configured to determine that the actual number of detection units in the X direction is the number of detection units that can be transmitted in the X direction when the upper limit value of the number of detection units that can be transmitted in the X direction is greater than or equal to the actual number of detection units in the X direction;
the second determination unit is configured to determine that the upper limit value of the number of detection units that can be transmitted in the X direction is the number of detection units that can be transmitted in the X direction when the upper limit value of the number of detection units that can be transmitted in the X direction is smaller than the actual number of detection units in the X direction.
In an optional embodiment, the third determining module 230 may be configured to determine the scan field of view according to the number of detection units capable of being transmitted in the X direction, a distance from a transmission source to a gantry rotation center, and an angular interval between two adjacent detection units capable of being transmitted in the X direction, when the upper limit value of the number of detection units capable of being transmitted in the X direction is smaller than the actual number of detection units in the X direction, where the angular interval is an included angle formed between the two adjacent detection units capable of being transmitted in the X direction and the transmission source, and the transmission source is a vertex of the included angle.
In an optional embodiment, the apparatus may further include: a receiving module;
the receiving module is configured to receive a region selection operation for an image of a detected object when the CT system displays the image, the region selection operation triggering the CT system to determine the data transmission capability, before the determining the data transmission capability of the CT system;
the third determining module 230 may include: a second determination submodule, a second comparison submodule and a third determination submodule; wherein the content of the first and second substances,
the second determination submodule is configured to determine the number of target detection units required for a target detection portion, which is a portion within the image region selected according to the region selection operation;
the second comparison submodule is configured to compare the target detection unit number with the size of the transmittable detection unit number;
the third determination submodule is configured to determine a scanning field of view of the CT system according to the comparison result.
In an optional embodiment, the third determining sub-module may include: a third determination unit and a fourth determination unit; wherein the content of the first and second substances,
the third determination unit is configured to determine the scanning field of view according to the number of the transmittable detection units when the number of the target detection units is greater than or equal to the number of the transmittable detection units;
the fourth determination unit is configured to determine the scanning field of view according to the number of the target detection units when the number of the target detection units is smaller than the number of the detection units capable of being transmitted.
Referring to fig. 9, for a schematic view of an embodiment of the terminal device of the present application, the terminal device may include: a memory 320, a processor 330, and an external interface 340 connected by an internal bus 310.
The external interface 340 is configured to obtain data;
a memory 320 for storing corresponding machine readable instructions for determining a scan field of view;
a processor 330 configured to read the machine-readable instructions on the memory 320 and execute the instructions to:
determining data transmission capability of the CT system;
determining the number of detection units capable of being transmitted on the detector under the condition of meeting the data transmission capacity;
and determining the scanning field of view of the CT system according to the quantity of the detection units capable of being transmitted.
Referring to fig. 10, for purposes of one embodiment of the CT system of the present application, the CT system may comprise: a detector 410, a scanning bed 420, and a terminal device 430. The detector 410 is used for detecting the rays attenuated by the detected object during the scanning process of the CT system, and converting the rays into pulse signals for outputting.
In one example, the detector 410 may include a plurality of detection units 411, each detection unit 411 includes a scintillation crystal 4111, a photoelectric conversion device 4112 and a processing circuit 4113, for convenience of example, only the structure of one detection unit 1 is illustrated for the N detection units 411 illustrated in fig. 10, the structures of the other detection units are the same, and are not illustrated one by one in fig. 10.
The scintillation crystal 4111 is configured to detect a ray attenuated by a detected object in a scanning process of the CT system, and convert the ray into an optical signal;
a photoelectric conversion device 4112 for converting the optical signal into an electrical signal;
the terminal device 430 is used for determining the data transmission capability of the CT system; determining the number of detection units capable of being transmitted on the detector under the condition of meeting the data transmission capacity; and determining the scanning field of view of the CT system according to the quantity of the detection units capable of being transmitted.
In the embodiments of the present application, the computer readable storage medium may be in various forms, such as, in different examples: a RAM (random Access Memory), a volatile Memory, a non-volatile Memory, a flash Memory, a storage drive (e.g., a hard drive), a solid state drive, any type of storage disk (e.g., an optical disk, a dvd, etc.), or similar storage medium, or a combination thereof. In particular, the computer readable medium may be paper or another suitable medium upon which the program is printed. Using these media, the programs can be electronically captured (e.g., optically scanned), compiled, interpreted, and processed in a suitable manner, and then stored in a computer medium.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (11)
1. A method for determining a scan field of view for use in a CT system, the method comprising:
determining data transmission capability of the CT system;
determining the number of detection units capable of being transmitted on the detector under the condition of meeting the data transmission capacity;
and determining the scanning field of view of the CT system according to the quantity of the detection units capable of being transmitted.
2. The method of claim 1, wherein the determining the data transmission capability of the CT system comprises:
acquiring the data transmission speed of the CT system;
acquiring the total detection time of the detector for one detection part;
and multiplying the data transmission speed and the total detection time length to obtain the upper limit value of the data volume transmitted by the CT system in the total detection time length.
3. The method of claim 2, wherein determining the number of probe units capable of transmitting on a probe while satisfying the data transmission capability comprises:
and determining the number of the detection units capable of being transmitted when the detection part is detected according to the data volume upper limit value and the number of sampling points of the detector to the detection part.
4. The method of claim 3, wherein the number of probe units capable of transmission comprises: the number of detection units capable of transmitting in the X direction; the determining the number of the detection units capable of being transmitted when the detection part is detected according to the data volume upper limit value and the number of the sampling points of the detector to the detection part comprises the following steps:
acquiring the actual detection unit number of the detector in the X direction and the actual detection unit number of the detector in the Z direction;
dividing the upper limit value of the data volume by the number of the sampling points to obtain the upper limit value of the number of the detection units which can be transmitted and correspond to one sampling point;
dividing the upper limit value of the number of the detection units capable of being transmitted corresponding to the sampling point by the number of the actual detection units in the Z direction to obtain the upper limit value of the number of the detection units capable of being transmitted in the X direction;
comparing the upper limit value of the number of the detection units capable of being transmitted in the X direction with the actual number of the detection units;
and determining the number of the detection units capable of being transmitted in the X direction according to the comparison result.
5. The method of claim 4, wherein determining the number of probe units capable of transmitting in the X direction according to the comparison comprises:
when the upper limit value of the number of the detection units capable of being transmitted in the X direction is greater than or equal to the number of the actual detection units in the X direction, determining that the number of the actual detection units in the X direction is the number of the detection units capable of being transmitted in the X direction;
and when the upper limit value of the number of the detection units capable of being transmitted in the X direction is smaller than the actual number of the detection units in the X direction, determining that the upper limit value of the number of the detection units capable of being transmitted in the X direction is the number of the detection units capable of being transmitted in the X direction.
6. The method according to claim 4, wherein when the upper limit value of the number of detection units capable of being transmitted in the X direction is smaller than the actual number of detection units in the X direction, the determining the scanning field of view of the CT system according to the number of detection units capable of being transmitted comprises:
according to the number of the detection units capable of being transmitted in the X direction, the distance from the emission source to the rotating center of the rack and the adjacent angle intervals of the detection units capable of being transmitted in the X direction, the scanning visual field is determined, the angle intervals are two adjacent detection units capable of being transmitted in the X direction and the included angle formed between the emission source, and the emission source is the vertex of the included angle.
7. The method of claim 1, wherein prior to said determining the data transmission capability of the CT system, the method further comprises:
receiving a region selection operation for an image of a detected object when the CT system displays the image, the region selection operation triggering the CT system to determine the data transmission capability;
the determining the scanning field of view of the CT system according to the number of the detection units capable of being transmitted comprises the following steps:
determining the number of target detection units required by a target detection part, wherein the target detection part is a part in the image area selected according to the area selection operation;
comparing the number of target detection units with the number of detection units capable of being transmitted;
and determining the scanning visual field of the CT system according to the comparison result.
8. The method of claim 7, wherein determining the scan field of view of the CT system based on the comparison comprises:
when the number of the target detection units is larger than or equal to the number of the detection units capable of being transmitted, determining the scanning visual field according to the number of the detection units capable of being transmitted;
and when the number of the target detection units is less than the number of the detection units capable of being transmitted, determining the scanning visual field according to the number of the target detection units.
9. An apparatus for determining a scan field of view, for use in a CT system, the apparatus comprising:
a first determination module configured to determine data transmission capabilities of the CT system;
the second determination module is configured to determine the number of the detection units capable of being transmitted on the detector under the condition that the data transmission capability is met;
a third determination module configured to determine a scanning field of view of the CT system based on the number of transmittable detection units.
10. A terminal device, comprising: the system comprises an internal bus, a memory, a processor and an external interface which are connected through the internal bus; wherein the content of the first and second substances,
the external interface is used for acquiring data;
the memory to store machine readable instructions to determine a scan field of view correspondence;
the processor is configured to read the machine-readable instructions on the memory and perform the following operations:
determining data transmission capability of the CT system;
determining the number of detection units capable of being transmitted on the detector under the condition of meeting the data transmission capacity;
and determining the scanning field of view of the CT system according to the quantity of the detection units capable of being transmitted.
11. A CT system, comprising: the system comprises a ray source, a detector and terminal equipment, wherein the ray source is used for emitting rays, the detector is used for detecting attenuated rays after the rays penetrate through different tissues, and the intensity of the attenuated rays is converted into an electric signal to be transmitted to the terminal equipment;
the terminal device is used for determining the data transmission capability of the CT system; determining the number of detection units capable of being transmitted on the detector under the condition of meeting the data transmission capacity; and determining the scanning field of view of the CT system according to the quantity of the detection units capable of being transmitted.
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