CN112617869A - Method and system for positioning communication breakpoint of CT slip ring - Google Patents
Method and system for positioning communication breakpoint of CT slip ring Download PDFInfo
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- CN112617869A CN112617869A CN202011334650.1A CN202011334650A CN112617869A CN 112617869 A CN112617869 A CN 112617869A CN 202011334650 A CN202011334650 A CN 202011334650A CN 112617869 A CN112617869 A CN 112617869A
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- slip ring
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/58—Testing, adjusting or calibrating apparatus or devices for radiation diagnosis
- A61B6/586—Detection of faults or malfunction of the device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention relates to a method for positioning a communication breakpoint of a CT slip ring, which comprises the following steps: the CT rotor rotates and accelerates to a set rotating speed of m revolutions per minute; the analog data generation board acquires a data generation instruction sent by the CT host, an internal timer starts timing when the encoding signal of the rotary encoder is zero, and the timer sends analog data to the RF module at intervals of timing time t; the data receiver receives the analog data, performs CRC (cyclic redundancy check) and uploads the data passing the CRC to the CT host; the CT host machine locates the vacant angle information of the data and switches and locates the position of the communication breakpoint according to the angle difference between the 12-point direction of the coding ring and the RF module. The method for positioning the communication break point of the CT slip ring judges the form of the characteristic data through continuous CRC to position the communication break point of the slip ring, has high positioning precision, can realize automatic positioning, and saves time and labor.
Description
Technical Field
The invention belongs to the technical field of CT, and particularly relates to a method and a system for positioning a communication breakpoint of a CT slip ring.
Background
The technology of CT is becoming more mature, and with the increasing demand, including cardiology, oncology, and emergency care, the generation, transmission, and processing of data requires powerful artifact-free imaging.
One of the major challenges of CT scanning is the need to transfer image data from the rotating X-ray detector array to a data processing workstation. The spiral CT slip ring mainly comprises a CT frame fixed end component and a CT frame rotating end component, and the main task of the spiral CT slip ring is to transmit detector data located on a rotor part to a computer located on a stator through an RF module. The radio frequency transmission comprises a radio frequency generating module and a receiving antenna, wherein the antenna part meets the characteristics of high transmission rate (usually 1.25Gbps and above), high data real-time performance and the like, and is usually and continuously fixed on the outermost layer of the slip ring. However, during the transportation and installation process of the CT slip ring, the slip ring antenna is often scratched, or the gap between the RF radio frequency modules is not uniform, so that the data transmission is not stable, and even the data is lost.
At present, communication breakpoints can only be positioned in a manual visual inspection mode, and particularly for some tiny communication breakpoints, the method is large in error, low in precision, and time-consuming and labor-consuming.
Disclosure of Invention
Based on the above-mentioned shortcomings and drawbacks of the prior art, an object of the present invention is to solve at least one or more of the above-mentioned problems of the prior art, in other words, to provide a method and a system for locating a communication breakpoint of a CT slip ring, which satisfy one or more of the above-mentioned needs.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for positioning a communication breakpoint of a CT slip ring comprises the following steps:
s1, accelerating the rotation of the CT rotor to a set rotation speed of m revolutions per minute;
s2, the analog data generating board acquires a data generating instruction sent by the CT host, the internal timer starts timing when the encoding signal of the rotary encoder is zero, and the timer sends analog data to the RF module at intervals of timing time t; wherein, t is (M/60) second/M, and M is the number of holes of the coding ring of the encoder; the coded signals corresponding to the 12-point direction of the coding ring of the rotary encoder are zero, and all holes of the coding ring correspond to the angle information one by taking the 12-point direction of the coding ring as a reference; the information of the analog data comprises angle information and CRC (cyclic redundancy check) data check information corresponding to the angle information; the length N of a data packet of the analog data is equal to T/M, and T is the speed bandwidth of the CT slip ring;
s3, the data receiver receives the simulation data, CRC check is carried out, and the data passing the check is uploaded to the CT host;
s4, the CT host machine locates the spare angle information of the data, and according to the angle difference between the 12-point direction of the coding ring and the RF module, the position of the communication break point is switched and located.
Preferably, the value of m is 60.
Preferably, M is 1440.
Preferably, T is 1.25 Gbps.
Preferably, in step S3, the data that fails to be checked is discarded.
The invention also provides a system for positioning the communication breakpoint of the CT slip ring, which comprises the following components:
a CT host;
the analog data generating board is in communication connection with the CT host and used for acquiring a data generating instruction sent by the CT host to control an internal timer to start timing when the encoding signal of the rotary encoder is zero, and the timer sends analog data to the RF module at intervals of timing time t; wherein, t is (M/60) second/M, and M is the number of holes of the coding ring of the encoder; the coded signals corresponding to the 12-point direction of the coding ring of the rotary encoder are zero, and all holes of the coding ring correspond to the angle information one by taking the 12-point direction of the coding ring as a reference; the information of the analog data comprises angle information and CRC (cyclic redundancy check) data check information corresponding to the angle information; the length N of a data packet of the analog data is equal to T/M, and T is the speed bandwidth of the CT slip ring;
the data receiver is in communication connection with the CT host and the RF module and is used for receiving the analog data, performing CRC (cyclic redundancy check) and uploading the data passing the CRC to the CT host;
the CT host is used for controlling the rotation of the CT rotor and setting the rotating speed of the CT rotor, positioning the vacant angle information, and converting and positioning the position of the communication breakpoint according to the angle difference between the 12-point direction of the coding ring and the RF module and outputting the position.
Preferably, the value of m is 60.
Preferably, M is 1440.
Preferably, T is 1.25 Gbps.
Preferably, the data receiver is further configured to discard data that fails the CRC check.
Compared with the prior art, the invention has the beneficial effects that:
the method and the system for positioning the communication breakpoint of the CT slip ring determine the form of the characteristic data through continuous CRC to position the communication breakpoint of the slip ring, have high positioning precision, can realize automatic positioning, and save time and labor.
Drawings
FIG. 1 is a flow chart of a method for positioning a communication breakpoint of a CT slip ring according to an embodiment of the present invention;
FIG. 2 is a schematic view of angle conversion of communication breakpoints according to an embodiment of the present invention;
fig. 3 is a frame diagram of a positioning system for a communication breakpoint of a CT slip ring according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
As shown in fig. 1, the method for positioning a communication breakpoint of a CT slip ring according to an embodiment of the present invention includes the following steps:
s1, the rotor starts to rotate;
specifically, the CT system is powered on, the rotation speed of the CT rotor is set to be 60rpm (not limited to 60rpm, but also 120rpm, 180rpm and the like), and the CT rotor is controlled to rotate and accelerate to the set rotation speed of 60 rpm; after the CT rotor rotates stably at 60rpm, the CT host sends a data generation instruction to the analog data generation board;
s2, starting timing by the analog data generating board and generating analog data;
specifically, the analog data generation board acquires a data generation instruction sent by the CT host, an internal timer starts timing when the encoding signal of the rotary encoder is zero, and the timer sends analog data to the RF module at intervals of timing time t;
t＝1s/1440＝694μs
1440 represents the number of holes of the coding ring of the encoder; the coded signal corresponding to the 12-point direction of the coding ring of the rotary encoder is zero;
each hole of the coding ring corresponds to the angle information one by taking the 12-point direction of the coding ring as a reference; i.e. 1440 portions of 360 ° of the circumference.
The information of the analog data comprises angle information and CRC (cyclic redundancy check) data check information corresponding to the angle information;
regarding the length of the data packet of the analog data, in order to cover the detection of all angles of the CT slip ring as much as possible, the data packet length N is:
N＝T/1440；
wherein, the length N of the data packet is T, and the rate bandwidth of the CT slip ring is T; for example: taking the slip ring at 1.25Gbps as an example, N is 116508 Byte.
S3, the data receiver receives the analog data and performs CRC check, the data passing the check is uploaded to the CT host, and the data not passing the check is discarded;
s4, performing data analysis after data acquisition is finished, and positioning breakpoints:
specifically, the CT host locates the vacant angle information, and switches and locates the position of the communication breakpoint according to the angle difference between the 12-point direction of the encoding ring and the RF module. As shown in fig. 2, the analog data information collected by the CT mainframe contains angle information, and the angle at this time corresponds to angle information of 12 o' clock direction (i.e. 0 ° direction of the stadium), and the communication breakpoint appears at the position of the RF module, so the angle conversion is needed. And after the communication breakpoint positioning is finished, the speed of the CT rotor is reduced, and the positioning inspection is finished.
As shown in fig. 3, an embodiment of the present invention further provides a system for positioning a communication breakpoint of a CT slip ring, including:
a CT host;
the analog data generating board is in communication connection with the CT host and used for acquiring a data generating instruction sent by the CT host to control an internal timer to start timing when the encoding signal of the rotary encoder is zero, and the timer sends analog data to the RF module (also called a slip ring RF data transmission module) at intervals of timing time t;
wherein t is 1s/1440 is 694 μ s, and 1440 is the number of holes of the encoder ring; the number of holes of the encoder ring of the encoder is not limited to 1440, and the encoder ring may have another number of holes.
The coded signal corresponding to the 12-point direction of the coding ring of the rotary encoder is zero;
each hole of the coding ring corresponds to the angle information one by taking the 12-point direction of the coding ring as a reference; i.e. 1440 portions of 360 ° of the circumference.
The information of the analog data comprises angle information and CRC (cyclic redundancy check) data check information corresponding to the angle information;
regarding the length of the data packet of the analog data, in order to cover the detection of all angles of the CT slip ring as much as possible, the data packet length N is:
N＝T/1440；
wherein, the length N of the data packet is T, and the rate bandwidth of the CT slip ring is T; for example: taking the slip ring at 1.25Gbps as an example, N is 116508 Byte.
The data receiver is in communication connection with the CT host and the RF module and is used for receiving the analog data and performing CRC (cyclic redundancy check), the data passing the CRC are uploaded to the CT host, and the data not passing the CRC are discarded;
the CT host is used for controlling the rotation of the CT rotor and setting the rotating speed of the CT rotor to be 60rpm, locating the spare angle information, and converting and locating the position of a communication breakpoint according to the angle difference between the 12-point direction of the coding ring and the RF module and outputting the position.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (10)
1. A method for positioning a communication breakpoint of a CT slip ring is characterized by comprising the following steps:
s1, accelerating the rotation of the CT rotor to a set rotation speed of m revolutions per minute;
s2, the analog data generating board acquires a data generating instruction sent by the CT host, the internal timer starts timing when the encoding signal of the rotary encoder is zero, and the timer sends analog data to the RF module at intervals of timing time t; wherein, t is (M/60) second/M, and M is the number of holes of the coding ring of the encoder; the coded signals corresponding to the 12-point direction of the coding ring of the rotary encoder are zero, and all holes of the coding ring correspond to the angle information one by taking the 12-point direction of the coding ring as a reference; the information of the analog data comprises angle information and CRC (cyclic redundancy check) data check information corresponding to the angle information; the length N of a data packet of the analog data is equal to T/M, and T is the speed bandwidth of the CT slip ring;
s3, the data receiver receives the simulation data, CRC check is carried out, and the data passing the check is uploaded to the CT host;
s4, the CT host machine locates the spare angle information of the data, and according to the angle difference between the 12-point direction of the coding ring and the RF module, the position of the communication break point is switched and located.
2. The method for positioning a communication breakpoint of a CT slip ring according to claim 1, wherein the value of m is 60.
3. The method for locating a communication breakpoint of a CT slip ring according to claim 1, wherein M is 1440.
4. The method for positioning a communication breakpoint of a CT slip ring according to claim 1, wherein T is 1.25 Gbps.
5. The method for locating a communication breakpoint of a CT slip ring according to claim 1, wherein in the step S3, the data that fails the verification is discarded.
6. A positioning system for a communication breakpoint of a CT slip ring is characterized by comprising:
a CT host;
the analog data generating board is in communication connection with the CT host and used for acquiring a data generating instruction sent by the CT host to control an internal timer to start timing when the encoding signal of the rotary encoder is zero, and the timer sends analog data to the RF module at intervals of timing time t; wherein, t is (M/60) second/M, and M is the number of holes of the coding ring of the encoder; the coded signals corresponding to the 12-point direction of the coding ring of the rotary encoder are zero, and all holes of the coding ring correspond to the angle information one by taking the 12-point direction of the coding ring as a reference; the information of the analog data comprises angle information and CRC (cyclic redundancy check) data check information corresponding to the angle information; the length N of a data packet of the analog data is equal to T/M, and T is the speed bandwidth of the CT slip ring;
the data receiver is in communication connection with the CT host and the RF module and is used for receiving the analog data, performing CRC (cyclic redundancy check) and uploading the data passing the CRC to the CT host;
the CT host is used for controlling the rotation of the CT rotor and setting the rotating speed of the CT rotor, positioning the vacant angle information, and converting and positioning the position of the communication breakpoint according to the angle difference between the 12-point direction of the coding ring and the RF module and outputting the position.
7. The system for positioning a communication breakpoint of a CT slip ring according to claim 6, wherein the value of m is 60.
8. The system as claimed in claim 6, wherein M is 1440.
9. The system for locating a communication breakpoint of a CT slip ring according to claim 6, wherein T is 1.25 Gbps.
10. The system for locating a communication breakpoint of a CT slip ring according to claim 6, wherein the data receiver is further configured to discard data that fails CRC check.
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| CN202011334650.1A CN112617869B (en) | 2020-11-24 | 2020-11-24 | Method and system for positioning communication breakpoint of CT slip ring |
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| CN202011334650.1A CN112617869B (en) | 2020-11-24 | 2020-11-24 | Method and system for positioning communication breakpoint of CT slip ring |
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Cited By (1)
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| CN114650070A (en) * | 2022-04-01 | 2022-06-21 | 上海联影医疗科技股份有限公司 | Signal transmission method and device, radio frequency module and CT system |
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| CN112617869B (en) | 2023-04-18 |
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