CN115493528A - Slip ring positioning system and method of CT (computed tomography) frame and computer readable storage medium - Google Patents
Slip ring positioning system and method of CT (computed tomography) frame and computer readable storage medium Download PDFInfo
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- CN115493528A CN115493528A CN202211189782.9A CN202211189782A CN115493528A CN 115493528 A CN115493528 A CN 115493528A CN 202211189782 A CN202211189782 A CN 202211189782A CN 115493528 A CN115493528 A CN 115493528A
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- 238000002591 computed tomography Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004590 computer program Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 description 4
- 238000011900 installation process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/08—Slip-rings
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention provides a slip ring positioning system, a slip ring positioning method and a computer readable storage medium of a CT (computed tomography) rack, wherein the system comprises a slip ring, a first belt ring which is parallel to the outer ring surface of the slip ring is arranged on the outer ring surface of the slip ring, a plurality of first light sources and second light sources are alternately arranged on the first belt ring, and the wavelengths of the first light sources and the second light sources are different; the encoder corresponds to the outer annular surface and comprises a photoelectric sensor and a counting module; when the slip ring rotates, the first light source and the second light source on the outer ring surface are alternately captured by the photoelectric sensor, the counting module counts the number of the captured first light source and the captured second light source, and the current position of the slip ring is obtained according to the count and the angle between two adjacent light sources.
Description
Technical Field
The invention relates to the technical field of CT equipment, in particular to a slip ring positioning system and method of a CT rack and a computer readable storage medium.
Background
The CT slip ring used in mass production at present basically uses a mechanical hole position type coding belt and a matched coder for positioning the rotating position. 1024A/B bit hole sites and 1 HOME hole site are arranged on the existing mechanical hole site type coding belt and are used for determining the position of a frame rotor when a slip ring rotates. However, the mechanical Kong Weishi code belt has the following problems in the using process:
1. the mechanical coding belt is easy to collide and damage in the installation process of the slip ring;
2. the replacement is not easy after the damage;
3. in the use process, the coding holes are easy to block, so that the error report of the rotation position is caused, and the image scanning is influenced;
4. the mechanical coding strip has high processing cost;
disclosure of Invention
In order to overcome the technical defects, the present invention aims to provide a slip ring positioning system, a slip ring positioning method and a computer readable storage medium for a CT gantry with low installation risk, low cost and high reliability.
The invention discloses a slip ring positioning system of a CT (computed tomography) rack, which comprises a slip ring, wherein the outer ring surface of the slip ring is provided with a first parallel belt ring, the first belt ring is alternately provided with a plurality of first light sources and second light sources, and the wavelengths of the first light sources and the second light sources are different; the encoder corresponds to the outer annular surface and comprises a photoelectric sensor and a counting module; when the slip ring rotates, the first light source and the second light source on the outer ring surface are alternately captured by the photoelectric sensor, the counting module counts the number of the captured first light source and the captured second light source, and the current position of the slip ring is obtained according to the count and the angle between two adjacent light sources.
Preferably, a second belt ring is further arranged on the outer ring surface, the second belt ring is parallel to the first belt ring, and a third light source is arranged on the second belt ring; when the third light source is captured by the photoelectric sensor, the current position is defined as an initial position, and the counting of the counting module is cleared at the initial position.
Preferably, a position on the first band corresponding to the third light source is empty, so that the first light source or the second light source is not captured on the first band when the third light source is captured on the second band by the photosensor.
Preferably, the photosensor comprises a first photosensor and a second photosensor, the first photosensor is used for capturing the first light source and the second light source; the second photosensor is for capturing the third light source.
Preferably, the device further comprises an angle measuring module, wherein the angle measuring module is used for measuring an angle between the slip ring and the CT bulb tube.
Preferably, a third band ring is further arranged on the outer ring surface, and a radio frequency antenna is arranged on the third band ring; the system also comprises a radio frequency module, wherein the radio frequency module and the encoder are arranged at the same axial position in the axial direction and correspond to the radio frequency antenna in the radial direction.
Preferably, the first light source emits red light with a wavelength of 770 to 622nm, the second light source emits orange light with a wavelength of 622 to 597nm, and the third light source emits yellow light with a wavelength of 597 to 577 nm.
The invention also discloses a slip ring positioning method of the CT machine frame, and based on the slip ring positioning system, the method comprises the following steps: when the slip ring rotates, the photoelectric sensor alternately captures the first light source and the second light source on the outer ring surface, meanwhile, the counting module counts the number of the captured first light source and the captured second light source, and the current position of the slip ring is obtained according to the count and the angle between two adjacent light sources.
Preferably, when the photoelectric sensor captures the third light source, the current position is defined as an initial position, the counting module clears counting in the initial position, and the angle measurement module is configured to measure an angle α between the slip ring and the CT bulb; when the slip ring rotates, the photoelectric sensor alternately captures the first light source and the second light source on the outer ring surface, meanwhile, the counting module counts the number of the captured first light source and the captured second light source, the angle of the slip ring relative to the initial position is obtained according to the count and the angle between two adjacent light sources, and the angle of the bulb tube relative to the initial position is obtained by combining the angle alpha.
The invention also discloses a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the slip ring positioning method.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. the CT slip ring adopting the light source positioning mode is used for replacing the CT slip ring of the traditional mechanical coding band, the risk of collision and damage in the installation process can be reduced, the risk of installation and damage of the slip ring is reduced, the problem that the coding band blocks the hole is avoided, the later maintenance is convenient, and the cost is reduced to a certain extent.
Drawings
FIG. 1 is a schematic diagram of a light-source coding strip according to the present invention;
FIG. 2 is an axial view of the slip ring provided by the present invention;
FIG. 3 is a radial view of the slip ring provided by the present invention;
fig. 4 is a schematic diagram of an included angle between the ball tube and the slip ring provided by the present invention.
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if," as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination," depending on the context.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
Referring to fig. 1-4, the present invention discloses a slip ring positioning system of a CT gantry, which includes a slip ring, wherein the slip ring includes an axial inner ring surface, an axial outer ring surface, and radial side ring surfaces at two sides. The light source type coding band is arranged on the outer ring surface, specifically, a first band ring is arranged on the outer ring surface of the slip ring, the first band ring is also an axial surface, and the light source type coding band is arranged on the first band ring. And, here, it can be understood that the light source type code band is the first band ring.
The first band ring (light source type coding band) is alternately provided with a plurality of first light sources and second light sources, the whole first band ring is full of the plurality of first light sources and the plurality of second light sources, namely the first light sources and the second light sources are completely and alternately arranged in 360 degrees, and the two adjacent light sources are arranged at equal intervals. And obtaining the angle between two adjacent light sources according to the number of the first light sources and the second light sources.
The wavelengths of the light emitted by the first light source and the second light source are different for the sensor to distinguish. Preferably, the first light source emits red light with a wavelength of 770 to 622nm, and the second light source emits orange light with a wavelength of 622 to 597 nm.
The optical fiber sensor further comprises an encoder, the encoder corresponds to the outer annular surface and comprises a photoelectric sensor and a counting module, and the photoelectric sensor is used for capturing different lights emitted by the first light source and the second light source and counting by the counting module.
When the slip ring rotates, the first light source and the second light source on the outer ring surface are alternately captured by the photoelectric sensor, and the counting module counts the number of the captured first light source and the captured second light source, so that the angle which the slip ring passes under the current counting can be obtained according to the counting and the angle between the two adjacent light sources. If the slip ring is at the initial position before counting, the angle of the slip ring passing by the current counting represents the actual angle position of the slip ring. If the position before counting is not the initial position, the actual angle position of the slip ring can be obtained by adding the angle before counting.
Specifically, referring to fig. 1, the black-and-white point is ase:Sub>A circle of 1024 first light sources and second light sources alternately arranged at 360 degrees, the slip ring has an initial count of ase:Sub>A, and when the slip ring is at any position, and the slip ring counter value is B, the angle of the slip ring with respect to 0 ° (initial position) is (B-ase:Sub>A) × 360/(1024).
It should be noted that "0 ° (initial position)" is a relative value, and the slip ring is not marked with a significant degree in practice, that is, there is no fixed 0 °, 30 °, 90 ° or the like on the slip ring, and for convenience of calculation, the slip ring at any position can be defined as 0 ° (initial position).
Furthermore, the outer ring surface is further provided with a second band ring, the second band ring is parallel to the first band ring and is an axial surface, it can be understood that the second band ring is arranged on the side edge of the first band ring, and the first band ring and the second band ring jointly form a light source type coding band. The second belt ring is provided with a third light source. When the photoelectric sensor captures a third light source, the current position is defined as an initial position, and counting of the counting module is cleared at the initial position. The third light source may be called a home light source, and emits light having a wavelength different from that of both the first light source and the second light source, and preferably, yellow light having a wavelength of 597 to 577 nm.
The whole second belt ring has only one home light source (third light source). And the position on the first band corresponding to the third light source is empty, so that when the photoelectric sensor captures the third light source on the second band, the photoelectric sensor does not capture the first light source or the second light source on the first band.
Preferably, referring to fig. 3, the photo sensor comprises a first photo sensor for capturing light emitted by the first light source and the second light source and a second photo sensor for capturing light emitted by the third light source.
Preferably, the device further comprises an angle measuring module, and the angle measuring module is used for measuring the angle between the slip ring and the CT bulb. For example, after a home light source (third light source) is detected, the motion is immediately stopped, an angle difference α between 0 ° of the bulb and 0 ° (initial position) of the slip ring is measured by the angle measurement module, and the angle passed by the slip ring under the current count can be obtained by the angle difference α according to the count and the angle between two adjacent light sources after the next slip ring motion is stopped, so that the position of the slip ring can be obtained.
Still taking 1024 first and second light sources alternately arranged in 360 degrees of the preferred embodiment as an example, the slip ring has an initial count of ase:Sub>A, and when the slip ring is in any position, the slip ring counter value is B, and the angle of the bulb with respect to 0 ° (initial position) is α + (B-ase:Sub>A) × 360/(1024).
Preferably, the outer ring surface is further provided with a third ring belt, and the third ring belt is generally parallel to the first ring belt and the second ring belt. Referring to fig. 2-3, the third band is provided with an rf antenna. The system also comprises a radio frequency module, wherein the radio frequency module and the encoder are integrated together and are arranged on the outer side of the slip ring, the radio frequency module and the encoder are arranged at the same axial position in the axial direction and correspond to the position of the radio frequency antenna in the radial direction.
The CT slip ring adopting the light source positioning mode adopts the light source type coding band (1024A/B light source and 1 home light source) to replace the CT slip ring of the traditional mechanical coding band, changes the installation position of the encoder, changes the reading logic, can reduce the risk of collision and damage in the installation process, reduces the installation damage risk of the slip ring, avoids the problem of hole blocking of the coding band, is convenient to maintain in the later period, and reduces the cost to a certain extent.
The invention also discloses a slip ring positioning method of the CT frame, based on the slip ring positioning system, when the slip ring rotates, the photoelectric sensor alternately captures the first light source and the second light source on the outer ring surface, the counting module counts the number of the captured first light source and the captured second light source at the same time, and the current position of the slip ring is obtained according to the count and the angle between the two adjacent light sources.
In a preferred embodiment, 1024A/B position light sources (a first light source and a second light source) and a home light source (a third light source) which are arranged outside the slip ring hit a photoelectric sensor on an encoder during the rotation of the slip ring; the encoder counts the light beams with different colors and positions received in the rotation process, and the encoder determines the current position of the slip ring through counting and feeds back the reading.
Referring to fig. 4, when the home light source is detected, the motion is stopped immediately, and the angle difference α between the 0 ° of the bulb and the 0 ° of the slip ring is measured by an angle measuring module (usually an inclinometer). And the slip ring counter is set to an initial value of a. In this embodiment, the first light source and the second light source adopt 4-frequency multiplication, and after 4-frequency multiplication, each ring of the slip ring can generate 1024 × 4 pulses. The slip ring unit pulse is measured to correspond to an angle of 360/(1024 x 4). When the slip ring is in any position, the slip ring counter value is B, and the slip ring angle is (B-ase:Sub>A) × 360/(1024 × 4) with respect to 0 °. Accordingly, the bulb real-time angle is α + (B-ase:Sub>A) × 360/(1024 × 4).
The invention also discloses a computer readable storage medium on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the slip ring positioning method.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.
Claims (10)
1. A slip ring positioning system of a CT (computed tomography) stand is characterized by comprising a slip ring, wherein a first belt ring is arranged on the outer ring surface of the slip ring, a plurality of first light sources and second light sources are alternately arranged on the first belt ring, and the wavelengths of the first light sources and the second light sources are different;
the encoder corresponds to the outer annular surface and comprises a photoelectric sensor and a counting module;
when the slip ring rotates, the first light source and the second light source on the outer ring surface are alternately captured by the photoelectric sensor, the counting module counts the number of the captured first light source and the captured second light source, and the current position of the slip ring is obtained according to the count and the angle between two adjacent light sources.
2. The slipring positioning system of claim 1, wherein a second belt loop is further provided on the outer annular surface, said second belt loop being parallel to said first belt loop, said second belt loop having a third light source provided thereon;
when the photoelectric sensor captures the third light source, defining the current position as an initial position, and emptying the counting of the counting module at the initial position.
3. The traveler positioning system of claim 2, wherein a location on the first strap loop corresponding to the third light source is empty such that the first light source or the second light source is not captured on the first strap loop when a photosensor captures the third light source on the second strap loop.
4. The slip ring positioning system of claim 2 wherein the photosensor comprises a first photosensor and a second photosensor, the first photosensor for capturing the first and second light sources; the second photosensor is for capturing the third light source.
5. The slip ring positioning system of claim 1, further comprising an angle measurement module for measuring an angle between the slip ring and a CT bulb.
6. The slip ring positioning system of claim 1, wherein a third ring loop is further disposed on the outer annular surface, the third ring loop having a radio frequency antenna disposed thereon;
the system also comprises a radio frequency module, wherein the radio frequency module is axially arranged at the same axial position as the encoder and radially corresponds to the radio frequency antenna.
7. The slipring positioning system of claim 2, characterized in that the first light source emits red light with a wavelength of 770-622 nm, the second light source emits orange light with a wavelength of 622-597 nm, and the third light source emits yellow light with a wavelength of 597-577 nm.
8. A method for positioning a slip ring of a CT gantry, the method comprising, based on the slip ring positioning system of any one of claims 1 to 7:
when the slip ring rotates, the photoelectric sensor alternately captures the first light source and the second light source on the outer ring surface, meanwhile, the counting module counts the number of the captured first light source and the captured second light source, and the current position of the slip ring is obtained according to the count and the angle between two adjacent light sources.
9. The slip ring positioning method of claim 8, further comprising:
when the photoelectric sensor captures the third light source, defining the current position as an initial position, emptying the counting of the counting module when the initial position is reached, and the angle measuring module is used for measuring an angle alpha between the slip ring and the CT bulb;
when the slip ring rotates, the photoelectric sensor alternately captures the first light source and the second light source on the outer ring surface, meanwhile, the counting module counts the number of the captured first light source and the captured second light source, the angle of the slip ring relative to the initial position is obtained according to the count and the angle between two adjacent light sources, and the angle of the bulb relative to the initial position is obtained by combining the angle alpha.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the slip ring positioning method of any one of claims 8-9.
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| CN202211189782.9A CN115493528B (en) | 2022-09-28 | 2022-09-28 | Slip ring positioning system and method of CT frame and computer readable storage medium |
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| CN202211189782.9A CN115493528B (en) | 2022-09-28 | 2022-09-28 | Slip ring positioning system and method of CT frame and computer readable storage medium |
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| CN115493528B (en) | 2024-05-24 |
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