CN110664419B - Method and device for determining scanning field of view, terminal equipment and CT system - Google Patents
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Abstract
The application discloses a method, a device, terminal equipment and a CT system for determining a scanning visual field. The method comprises the following steps: the data transmission capacity of the CT system is determined, the number of detection units capable of being transmitted on the detector is determined under the condition that the data transmission capacity is met, and the scanning view of the CT system is determined according to the number of the detection units capable of being transmitted, so that the CT system can transmit scanned data in the scanning view, the situation that the data is jammed and lost does not occur, a required CT image can be reconstructed, and the system availability is high.
Description
Technical Field
The present disclosure relates to the field of medical devices, and in particular, to a method, an apparatus, a terminal device, and a CT system for determining a scan field of view.
Background
CT (Computed Tomography ) is one of the advanced large-scale medical diagnosis imaging technologies at present, has higher application value in clinical medicine, and can be used for checking various diseases.
Along with the development of CT technology, the rotating speed of the rack is increased continuously, the scanning speed of the CT system is increased, the number of detection units is increased continuously, the data volume of one-time data acquisition is increased, and the data transmission speed requirement of the CT system is increased continuously.
If the scanning data acquisition speed is greater than the scanning data transmission speed, the scanning 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 present specification provides a method, an apparatus and a terminal device for determining a scan field of view.
Specifically, the application is realized by the following technical scheme:
in a first aspect, a method of determining a scan field of view is provided, for use in a CT system, the method comprising:
determining a data transmission capability of the CT system;
determining the number of detection units capable of being transmitted on the detector under the condition that the data transmission capability is met;
and determining the scanning visual field of the CT system according to the number of the detection units capable of being transmitted.
In a second aspect, there is provided 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 a data transmission capability of the CT system;
a second determining module configured to determine the number of detection units that can be transmitted on the detector, if the data transmission capability is satisfied;
a third determination module configured to determine a scan field of view of the CT system based on the number of transmittable detection units.
In a third aspect, there is provided a terminal device comprising: an internal bus, and a memory, a processor and an external interface connected through the internal bus; wherein,,
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 operations comprising:
determining a data transmission capability of the CT system;
determining the number of detection units capable of being transmitted on the detector under the condition that the data transmission capability is met;
and determining the scanning visual field of the CT system according to the number of the transmissible detection units.
In a fourth aspect, a CT system is provided, comprising: the device comprises a ray source, a detector and a terminal device, wherein the ray source is used for emitting rays, the detector is used for detecting the rays attenuated after passing through different tissues, and the intensity of the attenuated rays is converted into an electric signal to be transmitted to the terminal device;
the terminal equipment is used for determining the data transmission capacity of the CT system; determining the number of detection units capable of being transmitted on the detector under the condition that the data transmission capability is met; and determining the scanning visual field of the CT system according to the number of the transmissible detection units.
The technical scheme provided by the embodiment of the specification can comprise the following beneficial effects:
in the embodiment of the specification, under the condition that the data transmission capability of the CT system is met, the number of the detection units capable of being transmitted on the detector is determined, and the scanning view of the CT system is determined according to the number of the detection units capable of being transmitted, so that the CT system can transmit the scanned data in the scanning view, the situation that the data is jammed and lost does not occur, the required CT image can be reconstructed, and the system availability is higher.
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 disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and together with the description, serve to explain the principles of the specification.
FIG. 1 shows a schematic view of an application scenario of a CT system;
FIG. 2 is a flow chart illustrating a method of determining a scan field of view according to 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 the 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 of an apparatus for determining a scan field of view according to 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 exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present specification. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present description as detailed in the accompanying claims.
Referring to fig. 1, an application scenario of a CT system is schematically shown. The CT system may include a CT apparatus 10 and a terminal apparatus 20. The CT apparatus 10 may include a radiation source (such as a bulb tube 11), a detector 12, a gantry 13, and a scan bed 14, where the bulb tube 11 and the detector 12 are disposed in the gantry 13, and the scan bed 14 may drive an object to be detected to scan in the annular gantry 13.
The detector 12 may be an arc detector as shown in fig. 1, and the arc detector 12 includes a plurality of detecting units arranged in a matrix, and the detecting units are used for detecting the radiation attenuated by the detected object, converting the radiation into a pulse signal, and transmitting the pulse signal to the terminal device 20.
In the CT spiral scanning sampling process, the scanning bed 14 drives the detected object to the frame 13, the detector 12 and the bulb 11 rotate in a spiral mode, and meanwhile the scanning bed moves axially and horizontally, namely, the scanning bed rotates circumferentially and axially relative to the scanning bed at the same time, sampling is carried out after the detector 12 rotates for a preset angle, the sampling position is called a sampling point, the detector 12 detects rays at the sampling point, pulse signals generated based on the detected rays are transmitted to the terminal equipment 20, and the detection of the whole detection part is completed according to the method. The size of the preset angle can be set according to the actual implementation.
The detector transmits the acquired image data to the console in real time during the acquisition of the X-ray data, so that the data acquisition and data transmission of the CT system are almost simultaneously completed. In the process of scanning the detection part, the detector and the bulb tube rotate at high speed relative to the scanning bed, so that the total detection time of the CT system on the detection part is shorter in general. 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 acquired data to the console within the total duration of detecting the detection portion, so that the console may acquire incomplete reconstructed data when reconstructing an image, and an ideal reconstructed image is not obtained.
Therefore, the quantity of the acquired image data is controlled by adjusting the scanning visual field range of the CT system, so that the CT system can smoothly transmit all acquired data to a console within the total detection duration on the basis of the existing transmission capacity, and the CT system is very necessary.
Embodiments of determining a scan field of view of the present application are described in detail below in conjunction with the CT system shown in fig. 1.
Referring to fig. 2, a flowchart of one embodiment of a method of determining a scan field of view for the present application may include the steps of:
in step 101, the data transmission capabilities of the CT system are determined.
The data transmission capability of the CT system refers to the maximum data amount that the CT system can transmit within a preset time period. When the preset duration is 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 timing of determining the data transmission capability by the CT system is various, for example, the CT system determines the data transmission capability before scanning the detected object, or the CT system may start to perform the operation of determining the data transmission capability according to the operation specified by the operator, for example, before scanning the detected object, the CT system displays the image of the detected object on the terminal device in the CT system, the doctor may select the image area to be scanned, that is, the detection portion to be scanned, on the image by using the mouse, and the CT system starts to perform the operation of determining the data transmission capability according to the operation of selecting the image area of the image by the doctor.
In an alternative embodiment, referring to fig. 3, for another embodiment of a flowchart of a method of determining a scan field of view for 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 length of time the probe is detecting a detection site is acquired.
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 detection duration for one detection site may be: the length of time required to complete the detection of the detection site, or the total detection length of a detection site may be: and finishing the sum of the time length required by the detection of the detection part and the time delay time length, wherein the time delay time length is the time length required by transmitting the acquired and untransmitted data after finishing the detection of the last sampling point. The time delay period may be a value preset based on experience, and is typically a small value.
The total detection time length can be the time length corresponding to the whole number of circles of the detector rotated in the circumferential direction or the time length corresponding to the non-whole number of circles of the detector rotated, and can be determined according to the structure of the detection part and the equipment parameters.
For step 1013, the upper limit value of the data amount transmitted by the CT system in the total detection duration is the maximum data amount that can be transmitted by the CT system in the process of detecting a detection portion, 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 length of the detection part is the time length of one rotation of the detector, and the upper limit value of the data amount is the maximum data amount which can be transmitted by the CT system in the process of one rotation of the detector.
In step 102, the number of detection units that can be transmitted on the detector is determined, while satisfying the data transmission capabilities of the CT system.
The number of the detection units capable of being transmitted refers to that under the condition that the transmission capability of the system is fixed, the image data collected by the number of the detection units can be transmitted to the terminal device 20 in the total detection duration. When the data transmission capability of the CT system is poor, the number of the detection units capable of being 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 good, the number of the detection units capable of being transmitted on the detector is large, even equal to the number of all the detection units in the detector, and the CT system can smoothly transmit the data output by the large number of the detection units to the terminal equipment.
In an alternative embodiment, based on the method shown in fig. 3, referring to fig. 4, for another embodiment of a flowchart of a method of determining a scan field of view for 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 site is determined based on the upper limit value of the amount of data transmitted during the total detection time period determined in step 1013 and the number of sampling points of the detection site by the detector.
When a CT system scans a detection part, the detector rotates circumferentially and moves axially horizontally relative to the scanning bed, sampling is performed after each rotation of the detector rotates by a preset angle, and the 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 actual implementation, and different detection parts can have the same detection duration and the same number of sampling points or have different detection durations and different numbers of sampling points.
In an alternative embodiment, referring to fig. 5, which is a schematic diagram of the structure of the detector 12 in the CT system shown in fig. 1, in fig. 5, a direction parallel to the length of the detector bed is defined as a Z-direction, which is referred to in the art as a detector layer direction, and a direction perpendicular to the Z-direction is defined as an X-direction, which is referred to in the art as a detector channel direction.
In the implementation, the number of the detection units in the X direction is larger than that in the Z direction, and under the condition that the number of the detection units in the Z direction is unchanged, the scanning field of view of the CT system is changed by changing the number of the detection units in the X direction. The CT system then needs to determine the number of detection units that can be transmitted in the X-direction while satisfying its own data transmission capabilities.
Referring to fig. 6, for another embodiment of a flowchart of a method of determining a scan field of view of the present application, step 1021 may be implemented by:
in step 1021-1, the actual number of detection units of the detector in the X direction and the actual number of detection units in the Z direction are acquired.
In step 1021-2, the upper limit value of the amount of data transmitted in the total detection time period is divided by the number of sampling points of the detector on the detection part, so as to obtain the corresponding upper limit value of the number of detection units capable of being transmitted at one sampling point.
In step 1021-3, the upper limit value of the number of detection units corresponding to one sampling point is divided by the number of actual detection units in the Z direction, so as to obtain the upper limit value of the number of detection units capable of being transmitted in the X direction.
In step 1021-4, the upper limit value of the number of detection units that can be transferred in the X direction is compared with the size of the actual number of detection units.
In step 1021-5, the number of detection units that can be transmitted in the X direction is determined based on the comparison result.
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 steps 1021-2 and 1021-3, the number of sampling points for a detection site is the total number of sampling points required during detection of the detection site by the detector.
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 time length of one detection part; transmit speed x T is the upper limit value of the data quantity transmitted by the CT system in the total detection time; the nSlice is the number of detection units of all detection units in the Z direction; nViewPerRot is the total number of sampling points used to detect a detection site.
For 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 strong 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 number of actual detection units in the X direction is 800, and the number of X detection units that can be transmitted in the X direction is 800.
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, the upper limit value of the number of the detection units capable of being transmitted in the X direction is determined as the number of the detection units capable of being transmitted in the X direction. At this time, the CT system has weaker data transmission capability, and only can smoothly output the data output by the partial detection units on the detector. For example, the upper limit value of the number of detection units that can be transmitted in the X direction is 700, the actual number of detection units in the X direction is 800, and the number of detection units that can be transmitted in the X direction is 700.
In step 103, a scan field of view of the CT system is determined based on the number of transmittable detection units determined in step 102. The scan field of the CT system, that is, the scan field of the CT system that is actually used, abbreviated as the actual scan field, is determined according to a spatial region formed by a plurality of detection units and radiation sources that can be transmitted in the detector 12, and is the scan field 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 capable of being transmitted in the X direction is smaller than the actual number of detection units in the X direction, this step can be implemented by:
the scanning field of view is determined according to the number of detection units capable of being transmitted in the X direction, the distance from the emission source to the rotation center of the rack, and the angular interval between two adjacent detection units capable of being transmitted in the X direction.
The angle interval is an included angle formed between two adjacent detection units capable of transmitting in the X direction and the emission source, and the emission source is the vertex of the included angle. The angular interval of the two adjacent X-direction transmissible detection units can be calculated by the following equation (2):
wherein angleface channel is the angular interval of two adjacent detection units capable of transmitting in the X direction; fanAngle is the corresponding ray fan angle of the detector; nChannel is the number of detection units of all detection units present in the X direction.
The scan field of view of a CT system can be obtained by the following equation (3):
ActualScanFov＝D×sin((nActualChannel-1)×0.5×anglePerChannel))×2 (3)
wherein, actualscan is the scanning field of view of the CT system; d is the distance from the emission source to the rotation center of the rack; nActualChannel is the number of detection units that can be transmitted in the X direction; the gleperchannel is the angular separation of two adjacent X-direction transmissible detection units.
The scanning view field commonly used in the CT industry refers to the diameter of a circular scanning view field, and the area of the circular scanning view field can be directly determined.
By using the above formula, the scan 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, replacing the nActualChannel in the formula (3) with nChannel, wherein the obtained scanning view is the physical scanning view of the CT system, namely the maximum scanning view 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 acquire data, and the rest detection units in the X direction are controlled not to acquire data.
For example, referring to fig. 7, in a schematic cross-sectional view of the detector along the X-direction, in fig. 7, seven detecting units a exist in the detector along the X-direction, a distance from a bulb b to a rotation center o of the frame is D, a ray fan angle corresponding to the detector is θ, an angular interval between two adjacent detecting units a is θ1, a circle c1 is a physical scanning view on an 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 detecting units capable of transmitting on the detector meeting the data transmission capability, the circles c1 and c2 are concentric, and the detector uses the actual scanning view corresponding to the circle c2 to perform detection and scanning. In an alternative embodiment, in a scenario where the CT system displays an image of the detected object, receives a region selection operation for the image, and starts determining the own data transmission capability according to the region selection operation, step 103 may be implemented by:
the method comprises the steps of determining the number of target detection units required by a target detection part, wherein the target detection part is a part in an image area determined according to area selection operation;
a second step of comparing the number of target detection units with the number of detection units determined in step 102;
and a third step of determining a scanning field of view of the CT system based on 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 a scan field of view of the CT system according to the number of detection units determined in step 102; when the number of target detection units is smaller than the number of detection units determined in step 102, a scan field of view of the CT system is determined based on the number of target detection units.
For example, a doctor draws a frame on a leg area on a two-dimensional image of a patient by using a mouse, a CT system determines that the number of detection units required for detecting leg parts 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 self data transmission capability is N, wherein M, N is a positive number, and if M is determined to be greater than or equal to N, the scanning field of view of the CT system is determined according to N; if the M is less than N, determining the scanning visual field of the CT system according to the M.
Based on the arrangement of the steps, the CT system can adjust the scanning area and the scanning visual field selected by a doctor according to the quantity of the detection units which can be transmitted under the condition that the data transmission capability of the CT system is met, so that the scanning data, namely the detection data, can be smoothly transmitted to the terminal equipment, and the scanning data is not lost.
Preferably, after the steps are completed, the CT system may display a frame corresponding to the scan field 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 execute the 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 descriptions of the individual steps may be implemented in the form of software, hardware, or a combination thereof, for example, those skilled in the art may implement them in the form of software code, or may be computer-executable instructions capable of implementing the logic functions corresponding to the steps. When implemented in software, the executable instructions may be stored in 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 an embodiment 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 one embodiment of an apparatus for determining a scan field of view for use in a CT system may include: the first determination module 210, the second determination module 220, and the third determination module 230; wherein,,
the first determining module 210 is configured to determine a data transmission capability of the CT system;
the second determining module 220 is configured to determine the number of detection units that can be transmitted on the detector when the data transmission capability is satisfied;
the third determining module 230 is configured to determine a scan field of view of the CT system based on the number of transmittable detection units.
In an alternative embodiment, the first determining module 210 may include: the system comprises a first acquisition submodule, a second acquisition submodule and a multiplication submodule; wherein,,
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 duration of the detector on one detection part;
and the multiplication submodule is configured to multiply the data transmission speed and the total detection duration to obtain the upper limit value of the data quantity transmitted by the CT system in the total detection duration.
In an alternative embodiment, the second determining module 220 may be configured to determine the number of transmittable detection units when detecting the detection site according to the data amount upper limit value and the number of sampling points of the detection site by the detector.
In an alternative embodiment, the second determining module 220 may include: the device comprises a first acquisition sub-module, a first calculation sub-module, a second calculation sub-module, a first comparison sub-module and a first determination sub-module; wherein,,
the first acquisition sub-module is configured to, when the number of transmittable detection units includes: when the number of the detection units can be transmitted in the X direction, 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 calculation sub-module is configured to divide the data volume upper limit value by the number of sampling points to obtain a corresponding detection unit number upper limit value capable of being transmitted at one sampling point;
the second calculation sub-module is configured to divide 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, so as to obtain the upper limit value of the number of the detection units capable of being transmitted in the X direction;
the first comparing submodule is configured to compare 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;
the first determining submodule is configured to determine the number of detection units capable of being transmitted in the X direction according to the comparison result.
In an alternative embodiment, the first determining sub-module may include: a first determination unit and a second determination unit; wherein,,
the first determining unit is configured to determine that the actual number of detecting units in the X direction is the number of detecting units that can be transmitted in the X direction when the upper limit value of the number of detecting units that can be transmitted in the X direction is greater than or equal to the actual number of detecting units in the X direction;
the second determining unit is configured to determine 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 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.
In an alternative embodiment, the third determining module 230 may be configured to determine the scan field of view according to the number of the detection units capable of being transmitted in the X direction, the distance between the emission source and the rotation center of the gantry, and the angular interval between two adjacent detection units capable of being transmitted 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 emission source, and the emission source is a vertex of the included angle, 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.
In an alternative 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 before the data transmission capability of the CT system is determined, and the region selection operation triggers the CT system to determine the data transmission capability;
the third determining module 230 may include: the second determining sub-module, the second comparing sub-module and the third determining sub-module; wherein,,
the second determining submodule is configured to determine the number of target detection units required for a target detection part, and the target detection part is a part in the image area selected according to the area selection operation;
the second comparing sub-module is configured to compare the number of target detection units with the number of detection units capable of being transmitted;
the third determination submodule is configured to determine a scanning field of view of the CT system according to the comparison result.
In an alternative embodiment, the third determining sub-module may include: a third determination unit and a fourth determination unit; wherein,,
the third determining unit is configured to determine the scanning field of view according to the number of the transmittable detecting units when the number of the target detecting units is greater than or equal to the number of the transmittable detecting units;
the fourth determination unit is configured to determine the scan field of view according to the number of target detection units when the number of target detection units is smaller than the number of transmittable detection units.
Referring to fig. 9, a schematic diagram is shown for an embodiment of a terminal device of the present application, where the terminal device may include: a memory 320, a processor 330, and an external interface 340 connected by an internal bus 310.
Wherein, 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 for reading the machine readable instructions on the memory 320 and executing the instructions to perform the following operations:
determining a data transmission capability of the CT system;
determining the number of detection units capable of being transmitted on the detector under the condition that the data transmission capability is met;
and determining the scanning visual field of the CT system according to the number of the transmissible detection units.
Referring to fig. 10, a schematic diagram of one embodiment of a CT system of the present application may include: a detector 410, a scanning bed 420 and a terminal device 430. The detector 410 is used for detecting the radiation attenuated by the detected object and converting the radiation into a pulse signal for output during the scanning process of the CT system.
In one example, the detector 410 may include a plurality of detection units 411, each detection unit 411 including a scintillation crystal 4111, a photoelectric conversion device 4112, and a processing circuit 4113, and for convenience of illustration, only the structure of one of the detection units 1 is illustrated for the N detection units 411 shown in fig. 10, and the structures of the other detection units are the same and are not shown in fig. 10 one by one.
The scintillation crystal 4111 is configured to detect a radiation attenuated by the detected object and convert the radiation into an optical signal during the scanning process of the CT system;
a photoelectric conversion device 4112 for converting the optical signal into an electrical signal;
a processing circuit 4113 for converting the electrical signal into a pulse signal;
a terminal device 430 for determining data transmission capabilities of the CT system; determining the number of detection units capable of being transmitted on the detector under the condition that the data transmission capability is met; and determining the scanning visual field of the CT system according to the number of the transmissible detection units.
In embodiments of the present application, the computer-readable storage medium may take many forms, for example, in different examples, the machine-readable storage medium may be: RAM (Radom Access Memory, random access memory), volatile memory, non-volatile memory, flash memory, a storage drive (e.g., hard drive), a solid state drive, any type of storage disk (e.g., optical disk, dvd, etc.), or a similar storage medium, or a combination thereof. In particular, the computer readable medium may also be paper or other suitable medium capable of printing a program. Using these media, the programs may be electronically captured (e.g., optically scanned), compiled, interpreted, and otherwise processed in a suitable manner, and then stored in a computer medium.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the invention to the precise form disclosed, and any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method of determining a scan field of view for use in a CT system, the method comprising:
determining data transmission capabilities of the CT system, comprising: acquiring the data transmission speed of the CT system; acquiring the total detection time length of the detector for one detection part; multiplying the data transmission speed and the total detection duration to obtain an upper limit value of the data quantity transmitted by the CT system in the total detection duration;
determining the number of detection units capable of being transmitted on the detector under the condition that the data transmission capability is met;
and determining the scanning visual field of the CT system according to the number of the detection units capable of being transmitted.
2. The method of claim 1, wherein said determining the number of probe units that can be transmitted on the probe if the data transmission capability is satisfied 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.
3. The method of claim 2, wherein the number of probing units capable of transmitting comprises: the number of detection units that can be transported 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 sampling points of the detector to the detection part comprises the following steps:
acquiring the number of actual detection units of the detector in the X direction and the number of actual detection units of the detector in the Z direction;
dividing the data volume upper limit value by the sampling point number to obtain a corresponding transmissible detection unit number upper limit value at one sampling point;
dividing the upper limit value of the number of the detection units which can be transmitted and correspond 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 which can be 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.
4. A method according to claim 3, wherein said determining the number of detection units that can be transmitted in the X direction based on the comparison result 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.
5. A method according to claim 3, 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 scan field of view of the CT system according to the number of detection units capable of being transmitted comprises:
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 angle interval between the two adjacent detection units capable of transmitting in the X direction, wherein the angle 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 the vertex of the included angle.
6. The method of claim 1, wherein prior to said determining the data transmission capabilities 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, wherein the region selection operation triggers the CT system to determine the data transmission capability;
the determining the scanning 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 for a target detection part, wherein the target detection part is a part in an image area selected according to the area selection operation;
comparing the number of the target detection units with the number of the detection units capable of being transmitted;
and determining the scanning visual field of the CT system according to the comparison result.
7. The method of claim 6, wherein determining a scan field of view of the CT system based on the comparison comprises:
when the number of the target detection units is greater 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 smaller 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.
8. 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 a data transmission capability of the CT system, comprising: acquiring the data transmission speed of the CT system; acquiring the total detection time length of the detector for one detection part; multiplying the data transmission speed and the total detection duration to obtain an upper limit value of the data quantity transmitted by the CT system in the total detection duration;
a second determining module configured to determine the number of detection units that can be transmitted on the detector, if the data transmission capability is satisfied;
a third determination module configured to determine a scan field of view of the CT system based on the number of transmittable detection units.
9. A terminal device, comprising: an internal bus, and a memory, a processor and an external interface connected through the internal bus; wherein,,
the external interface is used for acquiring data;
the memory is used for storing machine-readable instructions corresponding to the determined scanning field of view;
the processor is configured to read the machine-readable instructions on the memory and perform operations comprising:
determining data transmission capabilities of a CT system, comprising: acquiring the data transmission speed of the CT system; acquiring the total detection time length of the detector for one detection part; multiplying the data transmission speed and the total detection duration to obtain an upper limit value of the data quantity transmitted by the CT system in the total detection duration;
determining the number of detection units capable of being transmitted on the detector under the condition that the data transmission capability is met;
and determining the scanning visual field of the CT system according to the number of the detection units capable of being transmitted.
10. A CT system, comprising: the device comprises a ray source, a detector and a terminal device, wherein the ray source is used for emitting rays, the detector is used for detecting the rays attenuated after passing through different tissues, and the intensity of the attenuated rays is converted into an electric signal to be transmitted to the terminal device;
the terminal equipment is used for determining the data transmission capacity of the CT system; determining the number of detection units capable of being transmitted on the detector under the condition that the data transmission capability is met; determining a scanning view of the CT system according to the number of the detection units capable of being transmitted; wherein said determining the data transmission capabilities of the CT system comprises: acquiring the data transmission speed of the CT system; acquiring the total detection time length of the detector on one detection part; and multiplying the data transmission speed and the total detection duration to obtain the upper limit value of the data quantity transmitted by the CT system in the total detection duration.
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