CN100486525C - CT slip-ring system based on optical fibre data transmission - Google Patents
CT slip-ring system based on optical fibre data transmission Download PDFInfo
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- CN100486525C CN100486525C CNB2006100026187A CN200610002618A CN100486525C CN 100486525 C CN100486525 C CN 100486525C CN B2006100026187 A CNB2006100026187 A CN B2006100026187A CN 200610002618 A CN200610002618 A CN 200610002618A CN 100486525 C CN100486525 C CN 100486525C
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Abstract
The invention discloses a CT slip-ring system based on optical fiber data transmission, which is characterized by the following: rotating the rotary part of scanner into CT system; adopting non-contact optical signal transmitting method to transmit data out of rotary part to image reconstructing system; improving interference-proof ability and reliability; reducing coding rate effectively.
Description
Technical field
The present invention relates to a kind of computed tomography imaging (Computed Tomography; Abbreviate " CT " as) data transmission system of system, particularly relate to the slip ring system of a kind of CT system.
Background technology
A kind of typical C T system mainly is made up of stationary part 110, rotating part 120 and corresponding control system and image re-construction system as shown in Figure 1.This stationary part 110 mainly is made up of frame (Gantry), frame control system and frame main control board; Among the figure for simple clear for the purpose of, only show frame relevant and frame control system 170 with the present invention.This rotating part is mainly by X-ray tube (Tube) and cooling system thereof and control system, collimator and control system thereof, filter, detector (Detector), data collecting system (Data Acquisition System; DAS), composition such as high tension generator; Among the figure for simple clear for the purpose of, only show the X-ray tube relevant 130, X ray control system 160, detector 150 and data collecting system 180 with the present invention.
Inspection object 140 lies on the examining table 230 accepts scanography, and this examining table 230 is controlled by examining table control system 220.X-ray tube 130 rotates under the control of X ray control system and continues the emission X ray, described ray pass check that object 140 is detected that device 150 detects and with its power conversion for can be for the signal of telecommunication of record.The signal that detector 150 detects converts digital data transmission to through data collecting system 180 and carries out image reconstruction to image re-construction system 240.
Above-mentioned examining table control system 220, X ray control system 160, frame control system 170 and image re-construction system 240 are to be controlled by computer 210.The scan operation personnel control by the scanography that control station 260 is controlled 210 pairs of CT systems of computer, and its process and result data show by display 270 and store by memorizer 250.
Traditional CT system is connected to its rotating part from the electric power system of its stationary part or stationary part outside by cable, is used for powering to the parts such as each X-ray tube of rotating part.The data that data acquisition system sampling in the rotating part obtains also connect and transfer to the image re-construction system of outside by cable.In addition, the master computer of CT system also adopts cable to be connected with described control system for order parameter being transferred to each control system of rotating part.Yet above-mentioned cable can twine when the rotating part of CT system rotates with respect to stationary part mutually, and the rotation angle range of rotating part is very little when making scanning at every turn, can only carry out low-angle reciprocating motion; And in each rotation sweep, processes such as startup, acceleration, stable, deceleration, braking must be arranged also, therefore each effective scanning scope is very restricted.Because above-mentioned reciprocating motion repeatedly, the winding between cable, tractive, phenomenon such as come off happen occasionally.Therefore, the employing cable of traditional CT system give that the power supply and the transfer of data of rotating part have caused scan period length, structure bulky complex, rotating speed is low and inhomogeneous, can't continuous sweep etc. problem.
In order to realize continuous sweep, overcome above-mentioned problems, slip ring is introduced in the CT system.Slip ring has solved electric power and the data transfer mode of frame rotation with stationary part, can realize continuous sweep.It is to replace cable with a slip ring and carbon brush, when brush when slip ring slides, then power and carry out transfer of data to X-ray tube through slip ring and carbon brush.See also Fig. 2, comprise that the slip ring 122 of several slideways is arranged on the exterior periphery of rotating part 120 (see figure 1)s continuously, carbon brush 112 is set at stationary part and contacts with described slip ring, thus by several above-mentioned slideways respectively to rotating part 120 power supply and carry out transfer of data.
Slip ring commonly used comprises low pressure slip ring and high pressure slip ring.The low pressure slip ring is to be input to rotating part from the outside with the unidirectional current of hundreds of volts by brush and slip ring, because voltage is lower, realizes good insulation performance easily, and the transmission performance of data is also very stable.But the electric current of this moment is very big, and electric arc just becomes a major issue, so low pressure slip ring requirement carbon brush and slip ring contact resistance are very little, slip ring often adopts the low-down material of resistivity.Because the high tension generator of low pressure slip ring is arranged on the rotating part, require that the high tension generator volume is little, in light weight, power is big.The low pressure slip ring is to insulating less demanding, and safety, stable, reliable is so adopted by most of CT manufacturer.The weak point of low pressure slip ring is that it rotates with X-ray tube, has increased the weight and volume of rotating part because high tension generator is arranged on the rotating part, makes that the velocity ratio of scanning is lower.
The high-tension current of high pressure slip ring is after being produced by the high tension generator that is arranged on the rotating part outside, to be input to rotating part by brush and slip ring.The high pressure slip ring of rotation is contained in the confined chamber that is full of insulation or noble gas, and high tension generator produces 120kV or 140kV voltage is input to rotating part through slip ring.The advantage of high pressure slip ring is to make high tension generator external, does not increase the weight of rotary frame on the one hand, also needn't worry the problems such as temperature rising that slip ring causes because of contact current, and scanning speed is faster; On the other hand, because high tension generator is not subjected to the restriction of volume weight, can make generator power do very greatly.But the high pressure slip ring causes the electrion between rotating part and the stationary part easily, causes high-voltage noise, influences the collection of data.
Above-mentioned low pressure and high pressure slip ring all are to adopt the mode of carbon brush and slip ring sliding-contact to come the data that collect are transmitted, but because the contact resistance between carbon brush and the slip ring constantly changes in the rotating part rotation, the contact resistance of this variation can produce very big signal noise, cause the unreliable of transmission data, therefore can not be used for the transmit high-speed signals data, particularly in the high pressure slip ring, the high-voltage noise that the electrion between rotating part and the stationary part parts causes has influenced the collection and the transmission of data especially.
Along with row's number of CT system detector increases, the speed of rotation sweep constantly accelerates, and the data acquisition amount of system in the unit interval constantly increases, and above-mentioned problem becomes the bottleneck of technical development all the more.Therefore, industry proposes a kind of wireless capacity coupled mode and carries out described transfer of data, and it is mainly used in the plural number row CT system.Wireless capacity coupled data transfer mode has overcome above-mentioned because contact resistance and electrion are to transmitting the influence of signal, but wireless capacity coupled electromagnetic field is than the interference effect that is easier to be subjected to external voltage, electric current and changes of magnetic field, so the accuracy of transfer of data and transfer rate are restricted and influence.
Summary of the invention
The objective of the invention is to propose a kind of CT slip ring system based on fibre optic data transmission with data high-speed that data collecting system is collected, transfer to the rotating part outside reliably.
For achieving the above object, the present invention proposes a kind of CT slip ring system based on fibre optic data transmission, be applied in the CT system of the rotating part that comprises stationary part and in this stationary part, be rotated scanning, with the transfer of data of the data collecting system that will be provided with in this rotating part outside this rotating part, it is characterized in that, this CT slip ring system comprises: be arranged on a plurality of electricity/light conversion elements on this rotating part along the circumferencial direction of this rotating part, it is connected with this data collecting system respectively, and the data transaction that this data collecting system is collected becomes optical signal, propagates with the form of light beam; Be arranged on this rotating part and be arranged in a plurality of condenser lenses of the light path of described light beam, be used for respectively described light beam being focused on; Be arranged on this stationary part around one section fibre bundle on the circumferencial direction of this rotating part, be used for receiving above-mentioned light beam through focusing on; And the light/power conversion system that is connected with described fibre bundle, be used for the beam signal that fibre bundle receives is converted to the signal of telecommunication; Wherein, distance between described electricity/light conversion element and angle be adjusted to make any two light beams in the minimum range between the focus on the described fibre bundle less than the ultimate range between the optical fiber of described fibre bundle.
Wherein, the data collecting system of described CT system is connected with detector in being arranged on rotating part, and the X-ray conversion of signals that detector is detected becomes the signal of telecommunication.The image re-construction system that the signal of telecommunication of described light/power conversion system is transferred to the CT system carries out image reconstruction.
Described electricity/light conversion element can be a laser diode.
Described light/power conversion system can be a Fibre Optical Sensor.
Described fibre bundle is can single row configuration; It also can be plural number row structure.
In the above-described embodiment, described light beam at the focus diameter on the described fibre bundle greater than the minimum range between any a pair of adjacent fiber.
Because the present invention adopts the CT slip ring system based on fibre optic data transmission to transmit the data signal that data collecting system collects, so capacity of resisting disturbance is strong, cause the reliability of data signal to reduce owing to the instability of contact resistance when having overcome the contact transmission of data signals and during non-contact type wireless Capacitance Coupled transmission of data signals owing to be subjected to the problems such as interference of external electromagnetic field easily, satisfied the low requirement of speed height, the bit error rate to the transmission of CT system data.
Description of drawings
Fig. 1 is the system structure sketch map of CT system;
Fig. 2 is the sketch map of existing slip ring, has shown that brush contacts with slip ring to carry out the transmission of electric power and data;
Fig. 3 is the system structure sketch map that the present invention is based on the CT slip ring system of fibre optic data transmission;
Fig. 4 A is the sketch map of an embodiment in A-A ' cross section among Fig. 3; And
Fig. 4 B is the sketch map of another embodiment in A-A ' cross section among Fig. 3.
The specific embodiment
See also Fig. 3, a CT system mainly is made up of stationary part 110, rotating part 120 and corresponding control system and image re-construction system.This stationary part 110 mainly is made up of frame, frame control system and frame main control board; Among the figure for simple clear for the purpose of, only show the frame relevant with the present invention.This rotating part mainly is made up of X-ray tube and cooling system thereof and control system, collimator and control system thereof, filter, detector, data collecting system, high tension generator etc.; Among the figure for simple clear for the purpose of, only show the X-ray tube relevant 130, detector 150 and data collecting system 180 with the present invention.
In the present invention, for giving rotating part 120 power supplies, can take existing mode, carbon brush 112 as shown in FIG. carries out the transmission of electric power with slip ring (figure does not show) mode that contacts.This slip ring is arranged on the excircle of rotating part 120; And that carbon brush 112 is arranged on this rotating part 120 is outside and contact with this slip ring, and to this slip ring transferring electric power, makes to continue rotation at this rotating part 120.According to the difference of low pressure slip ring and high pressure slip ring, this carbon brush 112 links to each other with different electric power system and corresponding low-voltage power or high-tension electricity is transferred to this slip ring.Certainly other the mode to the rotating part power supply as wireless capacity coupled mode etc., can be applied among the present invention equally.
In the scanography process of this CT system, X-ray tube 130 rotates under the control of X ray control system and continues the emission X ray, and described ray passes inspection object between this X-ray tube 130 and this detector 150 and is detected device 150 and detects.This detector 150 can be single or plural row's detector array, its with the power conversion of the X ray that detects for can be for the analog electrical signal of record.
This detector 150 links to each other with this data collecting system 180, and the signal that detects is transferred to this data collecting system 180 handles.This data collecting system 180 mainly is made up of amplifier, integrator and mould/number (A/D) transducer etc.By the detected analogue signal of detector, at first to pass through logarithmic compression, so that the circuit of back only need be operated in the narrow scope, because the output impedance of detector is very high, and output signal is very little, therefore must use the preamplifier of high input impedance to amplify and the impedance conversion, preamplifier is shielded and is positioned at the next door of detector well.Integrator is measured the summation of X linear light under all angles in the CT scan process, provide an output voltage, the accumulation of this voltage representative received signal in impulse duration, integrator is transferred to A/D converter with voltage signal between retention period, is digital signal by A/D converter with this signal transition.
As previously mentioned, when the data that the mode of available technology adopting carbon brush slip-ring contact collects data collecting system 180 are outwards transmitted from rotating part 120, cause the unreliable of transmission data owing to the contact resistance between carbon brush and the slip ring constantly changes in rotating part rotation, and the high-voltage noise that causes of the electrion between rotating part and the stationary part parts collection and the transmission of data have been influenced especially.And adopt data that wireless capacity coupled mode collects data collecting system 180 from rotating part 120 outwards transmission the time, electromagnetic field is than the interference effect that is easier to be subjected to external voltage, electric current and changes of magnetic field, so the accuracy of transfer of data and transfer rate are restricted and influence.The present invention adopts the CT slip ring system based on fibre optic data transmission to overcome above-mentioned shortcoming.
Please continue to consult Fig. 4 A, in one embodiment of the invention, being distributed in this stationary part 110 is single arrangements around the fibre bundle 340 of the circumferencial direction of this rotating part 120, can't be received because its diameter is little when dropping in this fibre bundle 340 arbitrarily between a pair of adjacent optical fiber for the focus that prevents described light beam 330, the focus diameter of this light beam 330 on fibre bundle 340 should be greater than the minimum range between any a pair of adjacent fiber in this fibre bundle 340, guarantee that promptly this light beam 330 has at least a part to be received by the optical fiber of described fibre bundle 340, then its optical signal just can be converted to the signal of telecommunication through light/power conversion system 350 of being connected with fibre bundle 340 lines, and this signal of telecommunication image re-construction system 240 of being transferred to the CT system carries out image reconstruction then.
See also Fig. 4 B, in another embodiment of the present invention, because in the rotary course of the rotating part 120 of CT system, might be because steadily do not cause the focus of this light beam 330 to swing back and forth towards the arrow direction with respect to fibre bundle 340, therefore in the present embodiment, being distributed in this stationary part 110 is that plural number row arranges around the fibre bundle 340 of the circumferencial direction of this rotating part 120.Similarly, can't be received because its diameter is little when dropping in this fibre bundle 340 arbitrarily between a pair of adjacent optical fiber for the focus that prevents described light beam 330, the focus diameter of this light beam 330 on fibre bundle 340 should be greater than the minimum range between any a pair of adjacent fiber in this fibre bundle 340, guarantee that promptly this light beam 330 has at least a part to be received by the optical fiber of described fibre bundle 340, then its optical signal just can be converted to the signal of telecommunication through light/power conversion system 350 of being connected with fibre bundle 340 lines, and this signal of telecommunication image re-construction system 240 of being transferred to the CT system carries out image reconstruction then.
Because the present invention adopts the CT slip ring system based on fibre optic data transmission to transmit the data signal that data collecting system 180 collects, so capacity of resisting disturbance is strong, cause the reliability of data signal to reduce owing to the instability of contact resistance when having overcome the contact transmission of data signals and during non-contact type wireless Capacitance Coupled transmission of data signals owing to be subjected to the problems such as interference of external electromagnetic field easily, satisfied the low requirement of speed height, the bit error rate to the transmission of CT system data.
Claims (9)
1. CT slip ring system based on fibre optic data transmission, be applied in the CT system of the rotating part (120) that comprises stationary part (110) and in this stationary part, be rotated scanning, with the transfer of data of the data collecting system (180) that will be provided with in this rotating part outside this rotating part, it is characterized in that this CT slip ring system comprises:
Be arranged on a plurality of electricity/light conversion elements (310) on this rotating part along the circumferencial direction of this rotating part, it is connected with this data collecting system respectively, and the data transaction that this data collecting system is collected becomes optical signal, propagates with the form of light beam (330);
Be arranged on this rotating part and be arranged in a plurality of condenser lenses (320) of the light path of described light beam, be used for respectively described light beam being focused on;
Be arranged on this stationary part around one section fibre bundle on the circumferencial direction of this rotating part, be used for receiving above-mentioned light beam through focusing on; And
With light/power conversion system that described fibre bundle is connected, be used for the beam signal that fibre bundle receives is converted to the signal of telecommunication;
Wherein, distance between described electricity/light conversion element (310) and angle be adjusted to make any two light beams (330) in the minimum range between the focus on the described fibre bundle (W1) less than the ultimate range between the optical fiber of described fibre bundle (W2).
2. according to the system of claim 1, it is characterized in that: described CT system comprises and is arranged on the detector (150) that is used for surveying the X-ray signal in this rotating part, described data collecting system is connected with described detector, and the X-ray conversion of signals that detector is detected becomes the signal of telecommunication.
3. according to the system of claim 1, it is characterized in that: the image re-construction system (240) that the signal of telecommunication of described light/power conversion system is transferred to the CT system carries out image reconstruction.
4. according to the system of claim 1, it is characterized in that: described electricity/light conversion element is a laser diode.
5. according to the system of claim 1, it is characterized in that: described light/power conversion system is a Fibre Optical Sensor.
6. according to the system of claim 1, it is characterized in that: described fibre bundle is a single row configuration.
7. according to the system of claim 1, it is characterized in that: described fibre bundle is a plural number row structure.
8. the system any according to claim 1-7 is characterized in that: have at least the focus of a branch of described light beam to drop on the described fibre bundle.
9. system according to Claim 8 is characterized in that: described light beam at the focus diameter on the described fibre bundle greater than the minimum range between any a pair of adjacent fiber.
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| CNB2006100026187A CN100486525C (en) | 2006-01-26 | 2006-01-26 | CT slip-ring system based on optical fibre data transmission |
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| CNB2006100026187A CN100486525C (en) | 2006-01-26 | 2006-01-26 | CT slip-ring system based on optical fibre data transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105453959A (en) * | 2014-08-13 | 2016-04-06 | 衢州市优德工业设计有限公司 | Plant snow removing device with accumulated snow detection function |
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| CN101683271B (en) * | 2008-09-28 | 2014-03-12 | 清华大学 | X-ray CT equipment, image reconstructing method and X-ray imaging method |
| 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 |
| CN103134991B (en) * | 2011-11-29 | 2015-04-29 | 上海西门子医疗器械有限公司 | Equipment with resistance measurement device and method for measuring carbon brush contact resistance |
| CN102522830A (en) * | 2011-12-01 | 2012-06-27 | 河北汉光重工有限责任公司 | Application of slide ring in wireless transmission |
| CN107174268A (en) * | 2017-04-24 | 2017-09-19 | 沈阳东软医疗系统有限公司 | A kind of collecting method and device |
| US10903685B2 (en) * | 2017-06-28 | 2021-01-26 | Ethicon Llc | Surgical shaft assemblies with slip ring assemblies forming capacitive channels |
| CN107582086B (en) * | 2017-09-28 | 2021-03-02 | 北京东软医疗设备有限公司 | Imaging device and frame thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105453959A (en) * | 2014-08-13 | 2016-04-06 | 衢州市优德工业设计有限公司 | Plant snow removing device with accumulated snow detection function |
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Owner name: SHANGHAI SIEMENS MEDICAL INSTRUMENTS CO., LTD. Free format text: FORMER OWNER: SIEMENS (CHINA) AG Effective date: 20080411 |
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Effective date of registration: 20080411 Address after: Zhou Hao road 278, Shanghai, Nanhui, China Code: 201318 Applicant after: Siemens Shanghai Medical Equipment Co., Ltd. Address before: 7, South Central Road, Chaoyang District, Beijing, Wangjing, China: 100102 Applicant before: Simens Co., Ltd. (China) |
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