CN113726441B - Rotary joint optical transmission system for medical CT machine - Google Patents
Rotary joint optical transmission system for medical CT machine Download PDFInfo
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- CN113726441B CN113726441B CN202111004884.4A CN202111004884A CN113726441B CN 113726441 B CN113726441 B CN 113726441B CN 202111004884 A CN202111004884 A CN 202111004884A CN 113726441 B CN113726441 B CN 113726441B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 45
- 230000005540 biological transmission Effects 0.000 title claims abstract description 37
- 230000003750 conditioning effect Effects 0.000 claims abstract description 19
- 238000004891 communication Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000002591 computed tomography Methods 0.000 claims description 7
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
- A61B6/035—Mechanical aspects of CT
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/56—Details of data transmission or power supply, e.g. use of slip rings
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
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Abstract
The application provides a rotary joint optical transmission system for a medical CT machine, and relates to the technical field of communication of CT equipment. The device comprises an optical signal transmitting end and an optical signal receiving end, wherein the transmitting end internally comprises a laser light source, a photoelectric modulator, a beam collimator and a matched structure; the optical signal receiving end comprises a conical lens, a light beam converging and focusing lens group, a photoelectric detection and signal conditioning circuit and a fixed mounting platform. The modulated signal is transmitted by the optical signal transmitting end arranged on the inner wall of the CT rotor and is transmitted to the optical signal receiving end after a certain distance, and the optical signal receiving end can receive the optical signal of the rotor for 360 degrees. According to the method, high-speed data on the rotor of the CT machine are transmitted to a fixed position to receive optical signals in an optical wireless communication mode, and the purpose of optical transmission of the rotary joint of the CT machine is achieved.
Description
Technical Field
The invention belongs to the technical field of medical equipment communication information, and relates to a rotary joint optical transmission system and a rotary joint optical transmission method for a medical CT machine.
Background
Ct (computed tomography), namely, computed tomography, which uses precisely collimated X-ray beams, gamma rays, ultrasonic waves, etc. to scan sections of a human body one after another around a certain part of the human body together with a detector with extremely high sensitivity, has the characteristics of fast scanning time, clear images, etc., and can be used for the examination of various diseases; the following can be classified according to the radiation used: x-ray CT (X-CT), and gamma-ray CT (gamma-CT).
The working process of the CT equipment comprises the following steps: the scanning part consists of an X-ray tube, a detector and a scanning frame, and is used for rotationally scanning a human body, and the X-ray detector receives signals; then, the information data collected by scanning is transmitted to a computer system for storage operation; and finally, displaying the CT image through the image processed and reconstructed by the computer. However, for the CT principle, images must be acquired by a scanning method, and now, a helical CT scan (helical CT scan) is developed. Therefore, when the problem of information transmission of a rotary joint is faced, the capacitive non-contact type information transmission is adopted at the present stage, the transmission mode has a limited speed, a large enough radiation antenna needs to be developed, and the requirement on volume power consumption is met.
Siemens proposes that an optical fiber receiver array is arranged at a rotary joint to form wireless optical transmission and is used in CT equipment; german venturetec provides capacitive wireless contact transfer devices for use in CT. At the present stage, a space light transmission system and a space light transmission method of a rotary joint of CT equipment do not exist, the system can improve the speed, support multichannel simultaneous transmission, and is simple to install, small in size and free of radiation interference.
In the prior art, a free space optical transmission system of a rotary joint of a CT device does not exist.
Disclosure of Invention
The technical problem solved by the invention is as follows: at the present stage, the data volume acquired by the CT device is getting larger and larger, the data transmission relying on the single-channel capacitive wireless contact gradually enters the bottleneck, and the transmission requirements of higher speed and low cost are obvious. The invention solves the problem of the transmission of the detection information of the multi-channel high-speed CT equipment, and can realize the effective transmission of the information in the rotary joint in the scanning process of the CT equipment by transmitting the detection information of the CT equipment according to the free space optical carrier.
The embodiment of the application provides a rotary joint optical transmission system for a medical CT machine, and relates to the technical field of optical communication. Including the CT host computer, laser communication transmitting system, conical lens, the light beam assembles focus lens group, receive photoelectric detector and modulate circuit, the fixed mounting platform, the stator connecting rod, the rotor installation one or more laser communication transmitting system of CT host computer, and the directional conical lens of light beam of transmission, the light beam is received the back by conical lens, insert the light beam at the back and assemble focus lens group at conical lens, the facula after the focus is received by proximate receipt photoelectric detector and modulate circuit, and conical lens, the light beam assembles focus lens group and receives photoelectric detector and modulate circuit and couple together through the integration structure, connect on the fixed mounting platform, the fixed mounting platform is got up by stator connecting rod and the stator fixed connection of CT host computer. The modulated signal is transmitted by the optical signal transmitting end arranged on the inner wall of the CT rotor and is transmitted at a certain distance to the optical signal receiving end, the optical signal receiving end is positioned in the middle of the fixed mounting platform connected with the connecting rod of the CT stator, and the optical signal receiving end can receive the optical signal of 360 degrees of the rotor and converge the optical signal to the center of the detector so as to facilitate photoelectric detection and signal conditioning. This application does not have strict restriction to receiving and dispatching distance, guarantees through the debugging that the light signal of transmission projects the conical lens of receiving terminal and both can satisfy information transmission's demand.
Optionally, the CT mainframe is a computer tomography mainframe for medical treatment, wherein the mainframe X-ray scanning requires 360 ° scanning.
Optionally, the laser communication emission system loads data obtained by X-ray detection onto an optical carrier, and includes an integrated light source, a photoelectric modulator and a beam collimator, and is specifically mounted on a rotor of the CT host (1) and rotates 360 ° synchronously with the X-ray probe.
Optionally, the conical lens converges the incident light beam, the converged and emitted light enters the light beam converging and focusing lens group, and the focused light spot is on a target surface for receiving the photoelectric detector, and is specifically connected with the fixed mounting platform as a whole.
Optionally, the receiving photodetector and the conditioning circuit include an optical filter, a photodetector, a photoelectric conversion conditioning circuit, and a focusing mechanism, and after the incident light beam is converged and passes through the optical filter, the light signal is converted into a current signal by the photodetector, and then converted into a standard defined interface signal by the conditioning circuit, and the standard defined interface signal is specifically connected to the fixed mounting platform.
High-speed data on a rotor of the CT machine is transmitted to a fixed position to be received in a laser wireless communication mode, so that the purpose of optical transmission of a rotary joint of the CT machine is achieved, the distance between a transmitting system and a receiving system in the system is changed, and the energy can be fully converged on a target surface of a detector by changing a focusing mechanism in a regulating light beam converging and receiving photoelectric detector and a conditioning circuit.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention utilizes the 360-degree transmission of multi-transmitting single-receiving optical carrier information, and can solve the directional multi-channel transmission of the rotary scanning data of the CT equipment.
(2) The invention can solve the problem of effective convergence detection of light at different distances in the installation process of the CT equipment by telescopic adjustment of photoelectric detection.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a diagram of an optical transmission system for a rotary joint of a CT apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the relationship between the light receiving angle and the cone angle according to the present invention;
fig. 3 is a diagram of a multi-channel optical transmission system for a rotary joint of a CT apparatus according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Fig. 1 shows a diagram of an optical transmission system for a rotary joint of a medical CT apparatus according to an embodiment of the present invention, which includes: the device comprises a CT host 1, a laser communication emission system 2, a conical lens 3, a light beam converging and focusing lens group 4, a receiving photoelectric detector and a conditioning circuit 6, a fixed mounting table 5 and a stator connecting rod 7. The laser communication emission system 2 is arranged on the inner side wall of a scanning rotor of the CT host 1, information of X-ray detection equipment in the CT host 1 is loaded on laser, and a light beam of a collimation number is emitted through the laser communication emission system 2. The main components of the receiving part are all placed in the center of the fixed mounting table 5 and are consistent with the center of a rotor of the CT main machine 1, the fixed mounting table 5 is connected with a stator connecting rod 7, and the stator connecting rod 7 is fixedly connected with a stator of the CT main machine 1. And power and high-speed signal on the fixed mounting table 5 can be connected to the CT host 1 through the hollow bridge of the stator connecting rod 7, and then the CT host 1 is connected into the data processing system, so that the system is not changed for the existing CT host 1, and only the laser emission system 2, the detachable stator connecting rod 7 and the components on the fixed mounting table 5 are added.
As shown in fig. 1, a light beam installed on a CT host 1 is received by a conical lens 3, and is firstly refracted and incident through the conical lens 3, the incident light beam is totally reflected inside the conical lens 3 and then emitted, the emitted light beam is perpendicular to the bottom surface of the conical lens 3, and the light spot is focused in a normal incidence converging and focusing lens group 4. According to the diagram of the relationship between the light receiving angle and the cone angle shown in fig. 2, the included angle between the cone lens 3 and the laser emission beam in the system is defined as β, the cone angle of the cone lens 3 is defined as α, and the relational expression between them is shown in the following
Where n is the refractive index of the conical lens 3, and if β is 180 ° and n is 1.57, the cone angle α of the conical lens is calculated to be 76 ° (full angle). When the radius of the rotor of the CT main unit 1 is 1.2m, and the distance between the center of the rotor of the CT main unit 1 and the conical lens 3 at the receiving end is 1.5m, the included angle β between the received light beams of the conical lens 3 is 43.6 °, and the cone angle α of the conical lens 3 is 47 ° (full angle) according to the refractive index n being 1.57. When the radius of the rotor of the CT main unit 1 is 1.2m, and the distance between the center of the rotor of the CT main unit 1 and the conical lens 3 at the receiving end is 1.8m, the included angle β between the received light beams of the conical lens 3 is 36.5 °, and the cone angle α of the conical lens 3 is 46.3 ° (full angle) calculated according to the refractive index n being 1.57. Therefore, the cone angle of the conical lens 3 set for the common CT medical host is about 47 degrees, and can be adjusted according to the adjustmentThe focal mechanism supplements and converges light spots.
Because different CT equipment different rotor positions, consequently can change to the distance between transmitting terminal and the receiving terminal, reduce to the distance of laser communication transmitting system 2 and receiving system, the focus that converges focusing lens group 4 when contained angle beta increases can shorten, consequently utilize the focusing mechanism who receives in photoelectric detector and the conditioning circuit 6, adjust photoelectric detector and come the light direction and adjust to light signal received energy is the biggest, here also can form the automatic regulation of closed loop control through displacement motor and light detection energy sensor.
When the CT host computer is installed for the first time, the detector is moved back and forth by receiving the focusing mechanism in the photoelectric detector and the conditioning circuit 6 according to the light spot intensity on the detector, so that the energy of the detector reaches the strongest, then the position of the detector is fixed, if the intensity of the received light is reduced after long-term use, the detector enters a calibration mode, the detector can be moved back and forth by receiving the focusing mechanism in the photoelectric detector and the conditioning circuit 6, so that the photoelectric detection signal is stably output, and data transmission is performed again.
For the implementation of multiple channels of the system, it is shown in detail in fig. 3. Adopt the laser communication transmitting system 2 of different wavelength, install on CT host computer 1's rotor inner wall in unison, the transmission is aimed at and is projected on conical lens 3, places wavelength beam splitting piece 8 in front of the focus of focusing lens group 4, separates into the light beam of different wavelength, receives the light signal of different wavelength through receiving photoelectric detector and conditioning circuit 6, so cascade can realize the realization of more passageways, and concrete realization is no longer repeated.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (5)
1. A rotary joint optical transmission system for a medical CT machine solves the problem of real-time data transmission in the medical CT scanning process, and is characterized by comprising: a CT host (1), a laser communication emission system (2), a conical lens (3), a light beam converging and focusing lens group (4), a receiving photoelectric detector and a conditioning circuit (6), a fixed mounting platform (5) and a stator connecting rod (7), wherein one or more laser communication emission systems (2) are arranged on a rotor of the CT host (1), and the emitted light beams are directed to the conical lens (3), and after the light beams are received by the conical lens (3), a light beam converging and focusing lens group (4) is connected behind the conical lens (3), the focused light spot is received by a close receiving photoelectric detector and a conditioning circuit (6), the conical lens (3), the light beam converging and focusing lens group (4) and the receiving photoelectric detector and conditioning circuit (6) are connected through an integrated structure and are connected to the upper surface of the fixed mounting table (5), and the fixed mounting table (5) is fixedly connected with a stator of the CT host (1) through a stator connecting rod (7);
laser communication emission systems (2) with different wavelengths are adopted to emit and project on the conical lens (3) in an aligned manner, a wavelength splitting sheet (8) is placed in front of a focal point of the converging and focusing lens group (4) and is separated into light beams with different wavelengths, and optical signals with different wavelengths are received through a photoelectric detector and a conditioning circuit (6), so that more channels can be realized through cascade connection;
the emitted light beam installed on the CT host (1) is received by the conical lens (3), firstly, the emitted light beam is refracted and incident through the conical lens (3), the incident light beam forms total reflection in the conical lens (3) and then is emitted, the emitted light beam is vertical to the bottom surface of the conical lens (3), and light spot focusing is carried out in the normal incidence converging and focusing lens group (4); the calculation process of the relation between the light receiving angle and the cone angle comprises the following steps:
an included angle between a conical lens (3) and a laser emission beam in the system is defined to be beta, a cone angle of the conical lens (3) is defined to be alpha, and relational expressions between the conical lens and the conical lens are defined
Wherein n is a conical lens(3) Is used as a refractive index of (1).
2. A rotary joint optical transmission system for a medical CT machine according to claim 1, wherein: the CT host (1) is a computer tomography host for medical treatment, wherein the host X-ray scanning needs 360-degree scanning.
3. A rotary joint optical transmission system for a medical CT machine according to claim 1, wherein: the laser communication emission system (2) loads data obtained by X-ray detection on an optical carrier, comprises an integrated light source, a photoelectric modulator and a beam collimator, is specifically arranged on the inner side wall of a rotor of the CT host (1), points to a conical lens (3) on a fixed mounting table (5) in the direction, and synchronously rotates with the X-ray probe by 360 degrees.
4. A rotary joint optical transmission system for a medical CT machine according to claim 1, wherein: the cone lens (3) converges incident light beams, and the converged and emergent light beams enter the light beam converging and focusing lens group (4) and then converge on the receiving photoelectric detector and the conditioning circuit (6), and are particularly connected with the fixed mounting table (5) into a whole.
5. A rotary joint optical transmission system for a medical CT machine according to claim 1, wherein: the receiving photoelectric detector and conditioning circuit (6) comprises an optical filter, a photoelectric detector, a photoelectric conversion conditioning circuit and a focusing mechanism, the focusing mechanism enables the detector to receive the maximum optical power by adjusting the position of the detector when different CT devices are installed on a rotary joint optical transmission system, incident light beams are converged and pass through the optical filter, then the light signals are converted into current signals by the photoelectric detector, the current signals are converted into interface signals defined by standards through the conditioning circuit, the interface signals are specifically connected with a fixed mounting platform (5), and the fixed mounting platform (5) is connected with a stator connecting rod (7).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108270486A (en) * | 2017-12-22 | 2018-07-10 | 西安空间无线电技术研究所 | A kind of novel optical communication system and method suitable for rotary joint |
| CN110417466A (en) * | 2019-07-12 | 2019-11-05 | 西安空间无线电技术研究所 | A kind of optic communication multi-transceiving system and method suitable for rotary joint |
| CN113067641A (en) * | 2021-03-10 | 2021-07-02 | 陕西周源光子科技有限公司 | Non-contact slip ring transmission system and related optical signal transmission method |
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| CA2574874C (en) * | 2006-04-28 | 2013-01-29 | Moog Inc. | Optical rotary joints, methods of mounting same in a properly-aligned manner, and optical reflector assemblies for use therein |
| WO2011091502A1 (en) * | 2009-10-01 | 2011-08-04 | Thunder Bay Regional Research Institute | Apparatus and methods for optical coherence tomography and confocal microscopy |
| CN101716082B (en) * | 2009-12-17 | 2011-08-24 | 北京航星机器制造公司 | Optical data transmission system between rotator and stator |
| CN203953689U (en) * | 2014-03-05 | 2014-11-26 | 上海西门子医疗器械有限公司 | Be applied to data communication system and the CT machine of CT machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108270486A (en) * | 2017-12-22 | 2018-07-10 | 西安空间无线电技术研究所 | A kind of novel optical communication system and method suitable for rotary joint |
| CN110417466A (en) * | 2019-07-12 | 2019-11-05 | 西安空间无线电技术研究所 | A kind of optic communication multi-transceiving system and method suitable for rotary joint |
| CN113067641A (en) * | 2021-03-10 | 2021-07-02 | 陕西周源光子科技有限公司 | Non-contact slip ring transmission system and related optical signal transmission method |
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