CN113995431B - CT scanning system, method, electronic device and storage medium - Google Patents
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Abstract
The invention provides a CT scanning system, a method, an electronic device and a storage medium, relating to the technical field of CT scanning, S101, determining a synchronous pulse of the CT system; s102, obtaining isochronous scanning pulses according to the synchronous pulse frequency division, and enabling the CT system to be in synchronous linkage; s103, setting data sampling time and motion parameters, calculating according to the motion parameters to obtain scanning preparation time, and obtaining a planning scanning control time sequence according to the scanning preparation time and isochronous scanning pulses; s104, acquiring image data with a timestamp and scanning bed position data according to the planned scanning control time sequence; and S105, merging the image data and the scanning bed position data according to the time stamp, and performing subsequent processing on the merged data to obtain a CT scanning image. The CT scanning system and the method improve the problems of higher comprehensive failure rate of the CT system, higher equipment maintenance cost and image quality caused by motion control errors in the prior art.
Description
Technical Field
The present invention relates to the field of CT scanning technologies, and in particular, to a CT scanning system, a CT scanning method, an electronic device, and a storage medium.
Background
The scanning frame in the CT system structure is divided into a rotating part and a static part, the rotating part and the static part are used for power supply, communication and data transmission through slip rings, the slip rings of the existing system need a plurality of rings such as power supply rings, signal rings, radio frequency rings and the like, each slip ring needs to be provided with a corresponding carbon brush and a corresponding circuit board, and a special metal plate structure, so that the complexity of the system is increased, and meanwhile, the equipment cost is improved. And the slip ring carbon brush is a loss part and needs to be periodically maintained and replaced, so that the maintenance cost of the equipment is increased.
The scanning control flow of the existing system is that an equidistant scanning pulse sequence is generated through rotation of a static part and a rotary encoder, and then is transmitted to a rotating part through a slip ring communication ring to perform real-time ray generation control, the control path is long, all links are likely to have faults, the comprehensive fault rate is high, and the stability of the equidistant scanning pulse depends on the machining precision and the stability of a motion system.
Disclosure of Invention
The invention aims to provide a CT scanning system, a CT scanning method, an electronic device and a storage medium, wherein the CT scanning method can solve the problems that in the prior art, the CT system is high in comprehensive failure rate and high in device maintenance cost, and image quality caused by motion control errors is improved.
In order to achieve the above purpose, the invention provides the following technical scheme:
the embodiment of the invention provides a CT scanning method, which specifically comprises the following steps:
s101, determining a synchronous pulse of a CT system;
s102, obtaining isochronous scanning pulses according to the synchronous pulse frequency division, and enabling the CT system to be in synchronous linkage;
s103, setting data sampling time and motion parameters, calculating according to the motion parameters to obtain scanning preparation time, and obtaining a planning scanning control time sequence according to the scanning preparation time and isochronous scanning pulses;
s104, acquiring image data with a timestamp and scanning bed position data according to the planned scanning control time sequence;
and S105, merging the image data and the scanning bed position data according to the time stamp, and performing subsequent processing on the merged data to obtain a CT scanning image.
On the basis of the technical scheme, the invention can be further improved as follows:
further, the determining the synchronization pulse of the CT system includes:
s1011, determining the communication interaction time of the static part and the rotating part according to the interaction between the static part optical communication module and the rotating part optical communication module;
s1012, determining a count value of the FPGA according to the communication interaction time and the FPGA clock period; and obtaining a time difference delay value according to the set counting initial value and the counting value, and determining the synchronous pulse of the CT system.
Further, calculating a planning scanning control time sequence according to the scanning preparation time;
and S1031, transmitting the planning scanning control time sequence from the rotating part to the static part.
Further, acquiring time-stamped image data and scanning bed position data according to the planned scan control schedule includes:
s1041, performing isochronous integral sampling according to a planned scanning control time sequence to obtain image data with a time stamp of a rotating part, and transmitting the image data with the time stamp through a radio frequency ring;
and S1042, performing position data acquisition on the scanning bed position information according to a time sequence plan to obtain scanning bed position data with a timestamp.
A CT scanning system comprising a gantry, the gantry comprising a rotating portion and a stationary portion, comprising:
the determining module is used for determining the synchronous pulse of the CT system;
the FPGA chip is arranged on the rotating part and the static part, is connected with the determining module and is used for synchronously linking the CT system according to the isochronous scanning pulse obtained by the frequency division of the synchronous pulse; setting data sampling time and motion parameters, calculating through the motion parameters to obtain scanning preparation time, and obtaining a planning scanning control time sequence according to the scanning preparation time and isochronous scanning pulses;
the data acquisition module is connected with the FPGA chip and used for acquiring image data with a timestamp and scanning bed position data according to the planned scanning control time sequence and the sampling interval;
and the data processing module is connected with the data acquisition module and is used for combining the image data with the time stamp and the scanning bed position data according to the time stamp and carrying out subsequent processing on the combined data to obtain a CT scanning image.
Furthermore, the scanning system further comprises a wireless communication module, which is arranged on the rotating part and the static part, is connected with the FPGA chip, and is used for realizing the interaction between the rotating part and the static part and sending the isochronous scanning control time sequence from the rotating part to the static part.
Furthermore, the CT system also comprises a rotating motor and a pulse encoder, wherein the rotating motor is arranged on the rotating part and is used for driving the rotating part to rotate;
the pulse encoder is arranged on the rotating part and used for generating pulses when the rotating motor rotates, calculating ray angles according to the pulses and reconstructing images according to the ray angles.
An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method when executing the computer program.
A non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method.
The invention has the following advantages:
according to the CT scanning method, the wireless communication module and the optical communication module are used for replacing a slip ring communication ring, the slip ring communication ring and a matched carbon brush structure are eliminated, and the equipment cost and the subsequent maintenance cost are reduced; mounting a motor at a rotating end; by using the planning scanning control time sequence, the time precision of image data acquisition is improved, and the problem of image quality reduction caused by equidistant time sequence control errors is reduced; the problem of CT system comprehensive failure rate among the prior art higher, the equipment maintenance cost is higher and improve the image quality that is brought by motion control error is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a CT scanning method of the present invention;
FIG. 2 is a schematic diagram of a CT scanning system according to the present invention;
FIG. 3 is a schematic diagram illustrating the control principle of the CT scanning system according to the present invention;
fig. 4 is a schematic structural diagram of an electronic device provided in the present invention.
The system comprises a determination module 10, an FPGA chip 20, a data acquisition module 30, a data processing module 40, a wireless communication module 50, an electronic device 60, a processor 601, a memory 602, a bus 603, an optical communication module 70, a rotating part 80, a static part 90 and a rotating motor 100.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of an embodiment of a CT scanning method of the present invention, and as shown in fig. 1, the CT scanning method provided in the embodiment of the present invention includes the following steps:
s101, determining a synchronous pulse of a CT system;
specifically, the embodiment of the present invention adds the optical communication module 70 to the CT gantry, which is respectively disposed on the stationary portion 90 and the rotating portion 80. The optical communication module 70 is composed of an infrared transmitting unit and an infrared receiving unit, and the TFDU4101 is an infrared transceiver module. DS26C31T is a four channel differential line driver designed specifically for digital data transmission over balanced lines. Embodiments of the present invention require that the gantry be rotated to a specific angle so that the optical communication modules 70 of the stationary portion 90 and the rotating portion 80 are aligned or conditionally aligned and form an optical communication link.
The number of the optical communication modules 70 in the rotating part 80 and the static part 90 is not less than one, the optical communication modules are uniformly distributed in the rotating part 80 and the static part 90, and communication interaction between the static part 90 and the rotating part 80 can be realized by only one pair of optical communication modules 70 at each moment. Taking four optical communication modules 70 as an example, the rotary part 80 is disposed at 0 °,90 °,180 °,270 °, the stationary part 90 is disposed at 0 °,22.5 °,45 °,67.5 °, and the arrangement position is shown in fig. 3.
The added optical module can carry out continuous communication in the scanning process, is mainly used for data verification in the scanning process, and belongs to an information feedback and state monitoring measure.
After an optical communication link is formed, the time for transmitting a synchronous sequence, the transmission delay and the synchronous sequence receiving time of an FPGA in an infrared communication module arranged on a static end of the CT scanning frame are obtained; and then acquiring the time for transmitting the response sequence from the FPGA in the infrared communication module arranged on the rotating end of the CT scanning frame to the FPGA in the infrared communication module arranged on the stationary end, the response delay and the response sequence receiving time. The time of sending a synchronous sequence by the FPGA in the infrared communication module at the stationary end of the CT scanning frame + the sending delay + the receiving time of the synchronous sequence = the time of sending a response sequence by the FPGA in the infrared communication module at the rotating end of the CT scanning frame + the response delay + the receiving time of the response sequence. The method comprises the steps of defining the time of an FPGA sending synchronous sequence in an infrared communication module at a static end of a CT scanning frame, the sending delay and the receiving time of the synchronous sequence as the total sending and receiving delay, defining the time of an FPGA sending response sequence in an infrared communication module at a rotating end of the CT scanning frame, the response delay and the receiving time of the response sequence as the total receiving and sending delay, wherein the total sending and receiving delay = the FPGA communication interaction time in the infrared communication modules at the static end and the rotating end of the CT scanning frame.
It should be noted that the time for transmitting the synchronization sequence, the time for receiving the synchronization sequence, the time for transmitting the response sequence, and the time for receiving the response sequence are all fixed protocol planning times, and this time is guaranteed by the processing capability of the FPGA, so that the time for transmitting the synchronization sequence = the time for receiving the synchronization sequence = the time for transmitting the response sequence = the time for receiving the response sequence. The sending delay and the response delay are special transmission delays of the CT system, and the sending delay and the response delay mainly form electric signal transmission delay plus device transmission delay.
The electric signal transmission delay is related to a transmission medium, and the calculation formula is that the electric signal transmission delay =3 × 108/Er0.5;
propagation in vacuum is 3 × 108m/s, er is the dielectric constant, and the material commonly used in printed circuit boards is FR4, which has a dielectric constant of 4, so the electrical signal transmission delay =1.5 × 108m/s.
If the CT system is designed to ensure that devices passing through by an infrared communication sending end and a receiving end on a transmission line are consistent, the transmission delay of the devices can be considered to be a certain fixed value, and at the moment, the sending delay = response delay.
And determining the count values of the FPGA in the infrared communication module at the stationary end and the FPGA in the infrared communication module at the rotating end of the CT scanning frame according to the acquired communication interaction time and the FPGA clock period. And determining a delay time difference value according to a counting initial value set by the FPGA of the stationary end and counting values of the FPGA in the infrared communication module of the stationary end and the FPGA in the infrared communication module of the rotating end, and further adjusting a scanning time sequence to determine the synchronous pulse of the CT system.
The processing of receiving and sending by the FPGA chip 20 to the optical communication module 70 includes, but is not limited to, clock synchronization, and real-time position checking.
S102, obtaining isochronous scanning pulses according to the synchronous pulse frequency division, and enabling the CT system to be in synchronous linkage;
specifically, the synchronous linkage of the rotating part 80 and the stationary part 90 refers to various key components of the system, such as high pressure, bulb tube, data acquisition, and the like.
S103, setting data sampling time and motion parameters, calculating according to the motion parameters to obtain scanning preparation time, and obtaining a planning scanning control time sequence according to the scanning preparation time and isochronous scanning pulses;
specifically, the isochronous scan control timing is an isochronous scan control timing which is a pulse train generated by clock division, and the stability thereof depends on the frequency stability generated by frequency division of an active crystal oscillator (electronic device). Isochronous accuracy and reliability are significantly better than equidistant.
The planning scan control sequence includes the whole process of the patient scan, including the preparation phase of the previous stage, the isochronous scan control phase and the scan end phase. The planned scan control timing is sent from the rotating portion 80 to the stationary portion 90.
S104, acquiring image data with a timestamp and scanning bed position data according to a planned scanning control time sequence;
specifically, isochronous integral sampling is performed according to a planned scanning control time sequence to obtain image data with a timestamp of the rotating part 80, and the image data with the timestamp is transmitted through the radio frequency ring; and (4) performing position data acquisition on the scanning bed position information according to time sequence planning to obtain scanning bed position data with a timestamp.
S105, merging the image data and the scanning bed position data according to the time stamp, and performing subsequent processing on the merged data to obtain a CT scanning image;
the rotating motor 100 is installed on the rotating part 80, the motor on the rotating part 80 is installed with a driving pulley, the driving pulley and the stationary end are connected through a belt, the force of the rotating motor 100 is transmitted to the stationary part 90 through the belt, the stationary part 90 is fixed, and the rotation of the rotating motor 100 finally drives the rotating part 80 to rotate.
The rotating electrical machine 100 is controlled to rotate at a constant speed, the rotating electrical machine 100 is controlled to be a self-closed loop, when the rotating electrical machine 100 rotates, the pulse encoder is driven to rotate to generate pulses, and each loop has a fixed pulse number output, for example, 1000 pulse numbers output. And calculating a ray angle according to the pulse, and reconstructing an image according to the ray angle.
The wireless communication module 50 and the optical communication module 70 are used for replacing a slip ring communication ring, and the slip ring communication ring and a matched carbon brush structure are eliminated, so that the maintenance cost and the manufacturing cost of the CT equipment are reduced.
Fig. 2 is a schematic control diagram of a CT scanning system of the present invention, fig. 3 is a schematic structural diagram of the CT scanning system of the present invention, and as shown in fig. 2 and fig. 3, an embodiment of the present invention provides a CT scanning system;
comprising a gantry comprising a rotating part 80 and a stationary part 90, comprising:
a rotating motor 100, disposed on the rotating portion 80, for driving the rotating portion 80 to rotate; the rotating motor 100 is installed on the rotating part 80, the motor on the rotating part 80 is installed with a driving pulley, the driving pulley and the stationary end are connected through a belt, the force of the rotating motor 100 is transmitted to the stationary part 90 through the belt, the stationary part 90 is fixed, and the rotation of the rotating motor 100 finally drives the rotating part 80 to rotate.
A pulse encoder provided to the rotating portion 80 for generating a pulse signal when the rotating electric machine 100 rotates; the rotating electrical machine 100 is controlled to rotate at a constant speed, the rotating electrical machine 100 is controlled to be a self-closed loop, when the rotating electrical machine 100 rotates, the pulse encoder is driven to rotate to generate pulses, and each loop has a fixed pulse number output, for example, 1000 pulse numbers output. The pulse encoder is configured to generate a pulse when the rotary motor 100 rotates, calculate a ray angle from the pulse, and perform image reconstruction according to the ray angle.
An optical communication module 70 disposed on the rotating part 80 and the stationary part 90; the optical communication module 70 is composed of an infrared transmitting unit and an infrared receiving unit, and the TFDU4101 is an infrared transceiver module. DS26C31T is a four-channel differential line driver designed specifically for digital data transmission over balanced lines. Embodiments of the present invention require rotating the gantry to a specific angle to align or conditionally align the optical communication modules 70 of the stationary portion 90 and the rotating portion 80 and form an optical communication link.
The number of the optical communication modules 70 in the rotating part 80 and the static part 90 is not less than one, the optical communication modules are uniformly distributed in the rotating part 80 and the static part 90, and communication interaction between the static part 90 and the rotating part 80 can be realized by only one pair of optical communication modules 70 at each moment. Taking four optical communication modules 70 as an example, the rotating portion 80 is disposed at 0 °,90 °,180 °,270 °, the stationary portion 90 is disposed at 0 °,22.5 °,45 °,67.5 °, and the arrangement position is shown in fig. 3.
A determining module 10 for determining the synchronous pulse of the CT system;
the FPGA chip 20 is arranged on the rotating part 80 and the static part 90, is connected with the determining module 10, and is used for synchronously linking the rotating part 80 and the static part 90 according to the isochronous scanning pulse obtained by frequency division of the synchronous pulse; setting data sampling time and motion parameters, calculating to obtain scanning preparation time through the motion parameters when the scanning frame rotates to a constant speed, and obtaining a planned scanning control time sequence according to the scanning preparation time and the isochronous scanning pulse;
the data acquisition module 30 is connected with the FPGA chip 20 and is used for acquiring image data with a timestamp and scanning bed position data according to the planned scanning control time sequence and the sampling interval;
and the data processing module 40 is connected with the data acquisition module 30, and is configured to receive the image data with the timestamp and the scanning bed position data, combine the image data with the timestamp according to the timestamp, and perform subsequent processing on the combined data to obtain a CT scanning image.
A wireless communication module 50, disposed on the rotating part 80 and the stationary part 90, for implementing interaction between the rotating part 80 and the stationary part 90, and sending the isochronous scanning control sequence from the rotating part 80 to the stationary part 90;
the data acquisition module 30 is further configured to:
performing isochronous integral sampling according to a planned scanning control time sequence to obtain image data with a time stamp of the rotating part 80, and transmitting the image data with the time stamp through a radio frequency ring; and performing position data acquisition on the scanning bed position information according to time sequence planning to obtain scanning bed position data with a timestamp.
The CT scanning system provided in the embodiment of the present invention may be specifically configured to execute the processing flow of each of the above method embodiments, and the functions thereof are not described herein again, and refer to the detailed description of the above method embodiments.
Fig. 4 is a schematic structural diagram of an entity of an electronic device 60 according to an embodiment of the present invention, and as shown in fig. 4, the electronic device 60 includes: a processor 601 (processor), a memory 602 (memory), and a bus 603;
the processor 601 and the memory 602 complete communication with each other through the bus 603;
The present embodiments provide a non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform the methods provided by the above method embodiments, for example, including: determining a synchronous pulse of the CT system; according to the synchronous pulse frequency division, obtaining an isochronous scanning pulse, and enabling the CT system to be in synchronous linkage; setting data sampling time and motion parameters, calculating according to the motion parameters to obtain scanning preparation time, and obtaining a planning scanning control time sequence according to the scanning preparation time and isochronous scanning pulses; acquiring image data with a timestamp and scanning bed position data according to the planning scanning control time sequence; and merging the image data and the scanning bed position data according to the time stamp, and performing subsequent processing on the merged data to obtain a CT scanning image.
Those of ordinary skill in the art will understand that: all or part of the steps of implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer-readable storage medium, and when executed, executes the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on the understanding, the above technical solutions substantially or otherwise contributing to the prior art may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method of various embodiments or some parts of embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A CT scanning method is characterized by comprising the following steps:
s101, determining the communication interaction time of a static part and a rotating part according to the interaction between the optical communication module of the static part and the optical communication module of the rotating part; determining the count value of the FPGA according to the communication interaction time and the FPGA clock period; obtaining a time delay time difference value according to the set counting initial value and the counting value, and determining a synchronous pulse of the CT system;
s102, obtaining isochronous scanning pulses according to the synchronous pulse frequency division, and enabling the CT system to be in synchronous linkage;
s103, setting data sampling time and motion parameters, calculating according to the motion parameters to obtain scanning preparation time, and obtaining a planning scanning control time sequence according to the scanning preparation time and isochronous scanning pulses;
s104, acquiring image data with a timestamp and scanning bed position data according to the planned scanning control time sequence;
and S105, merging the image data and the scanning bed position data according to the time stamp, and performing subsequent processing on the merged data to obtain a CT scanning image.
2. The CT scanning method of claim 1, wherein deriving a planned scan control timing from the scan preparation time and isochronous scan pulses comprises:
and S1031, transmitting the planning scanning control time sequence from the rotating part to the static part.
3. The CT scanning method of claim 1, wherein acquiring time-stamped image data and couch position data according to the planned scan control schedule comprises:
s1041, performing isochronous integration sampling according to a planned scanning control time sequence to obtain image data with a time stamp of a rotating part, and transmitting the image data with the time stamp through a radio frequency ring;
and S1042, performing position data acquisition on the scanning bed position information according to a time sequence plan to obtain scanning bed position data with a timestamp.
4. A CT scanning system comprising a gantry, the gantry including a rotating portion and a stationary portion, comprising:
the determining module is used for determining the communication interaction time of the static part and the rotating part according to the interaction between the static part optical communication module and the rotating part optical communication module; determining the count value of the FPGA according to the communication interaction time and the FPGA clock period; obtaining a time difference delay value according to the set counting initial value and the counting value, and determining the synchronous pulse of the CT system;
the FPGA chip is arranged on the rotating part and the static part, is connected with the determining module and is used for synchronously linking the CT system according to the isochronous scanning pulse obtained by the frequency division of the synchronous pulse; setting data sampling time and motion parameters, calculating through the motion parameters to obtain scanning preparation time, and obtaining a planning scanning control time sequence according to the scanning preparation time and isochronous scanning pulses;
the data acquisition module is connected with the FPGA chip and is used for acquiring image data with a timestamp and scanning bed position data according to the planned scanning control time sequence and the sampling interval;
and the data processing module is connected with the data acquisition module and is used for combining the image data with the time stamp and the scanning bed position data according to the time stamp and carrying out subsequent processing on the combined data to obtain a CT scanning image.
5. The CT scanning system of claim 4, further comprising a wireless communication module disposed between the rotating portion and the stationary portion, connected to the FPGA chip, for enabling interaction between the rotating portion and the stationary portion and transmitting the isochronous scan control sequences from the rotating portion to the stationary portion.
6. The CT scanning system of claim 4, further comprising a rotary motor and a pulse encoder, wherein the rotary motor is disposed on the rotating portion for rotating the rotating portion;
the pulse encoder is arranged on the rotating part and used for generating pulses when the rotating motor rotates, calculating ray angles according to the pulses and reconstructing images according to the ray angles.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor realizes the steps of the method according to any of claims 1 to 3 when executing the computer program.
8. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111255963.2A CN113995431B (en) | 2021-10-27 | 2021-10-27 | CT scanning system, method, electronic device and storage medium |
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| CN202111255963.2A CN113995431B (en) | 2021-10-27 | 2021-10-27 | CT scanning system, method, electronic device and storage medium |
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