CN2570780Y

CN2570780Y - Intelligent scanning beam-defining clipper mating with radioactive ray source

Info

Publication number: CN2570780Y
Application number: CN 02274114
Authority: CN
Inventors: 台谨贤; 楼珊珊; 相欣; 祝建华
Original assignee: SHENYANG DONGRUAN DIGITAL MEDICAL SYSTEM CO Ltd
Current assignee: SHENYANG DONGRUAN DIGITAL MEDICAL SYSTEM CO Ltd
Priority date: 2002-07-11
Filing date: 2002-07-11
Publication date: 2003-09-03
Anticipated expiration: 2012-07-11

Abstract

The utility model relates to an intelligent scanning beam defining clipper matched with a ray source, which relates to a ray detecting device which can change the mechanical quantity of a ray beam. The aim of the utility model is to discloses an intelligent scanning beam defining clipper matched with a ray source to control the central position of a fan beam of the ray beam, and the width of the fan beam and does not affect effects, and the intelligent scanning beam defining clipper matched with a ray source is composed of a servo controller, a servo, a servomotor, an incremental coder, and a mechanical drive mechanism controlled by the incremental coder. Compared with the prior art, the improved beam defining clipper has the advantages that the central position of the ray beam and the width of the fan beam can be intelligently changed, the ray dose can be reduced, the scanning time can be reduced, the irradiated area can be reduced, and the automatic positioning effect can be realized. The utility model is most suitable for a CT machine and is also suitable for other machines using rays for detecting.

Description

A kind of and the supporting intelligent scanning beam-defining clipper of radiographic source

Affiliated technical field

The utility model relates to a kind of device that ray changes fan-beam center and fan-beam width of controlling, particularly at the corollary apparatus that changes CT machine radiographic source working method.

Background technology

The CT machine is a kind of known Dynamic Non-Destruction Measurement, and it includes radioactive source, beam-defining clipper, detecting device, DAS system, imaging and display system, bed body and rotary part.Radioactive source, such as the X ray tube, beam that the X ray tube sends is through beam-defining clipper, arrives the detection system that a plurality of detecting units are formed after passing the person under inspection.Radioactive source and detection system all are installed in one can the system for winding axle on the frame of rotation, and person under inspection's bracing or strutting arrangement can move along the direction of system's axle.Position and angle that radioactive source sends beam constantly change along with the rotation of frame.When ray was injected the detecting unit of detection system, detecting unit can produce a signal, and this ray of this signal indication is by the energy summation after the overall decay on the path of its directed toward detector unit.To imaging device, this raw data can be handled with projection or other method, sets up person under inspection's stratiform bidimensional cross-section image at last with the original data transmissions after this conversion of signals in the DAS system.Detection system by means of multirow and multiple row detecting element process can be accepted multi-layer information simultaneously.Beam is a fan beam, and 3 parameters are arranged: fan angle, fan-beam center and fan-beam width.The effect of beam-defining clipper is the ejaculation scope of restriction beam, improves the quality and the radiation that reduces the person under inspection of image.General beam-defining clipper only changes the fan-beam width now.It adjusts the emission fan-beam width of beam according to the bed thickness of scanning, thereby makes the person under inspection accept the radiation exposure of corresponding width.At present, a development trend in the CT scan is: the suffered dosage of more and more faster sweep velocity and person under inspection is more and more littler.The irradiated area that shorten sweep time, reduce emission dosage, reduces the person under inspection further makes the suffered dosage of person under inspection reduce.

Summary of the invention

The objective of the invention is to provide at development trend a kind of the person under inspection is reduced radiation, intelligent change beam fan-beam center, fan-beam width, and the person under inspection reduced irradiated area, shorten irradiation time, only shone the intelligent scanning beam-defining clipper supporting with radiographic source at examining organ.

The object of the present invention is achieved like this.Promptly be provided with a kind of and the supporting intelligent scanning beam-defining clipper of radiographic source in CT machine radiographic source bottom.This beam-defining clipper is mainly by being made up of the intelligence controlling device of mechanical transmission mechanism and Based Intelligent Control beam fan-beam center and fan-beam width.Wherein mechanical transmission mechanism includes two groups of axles that link to each other with servomotor by shaft coupling.Axle end at the last whole story is respectively by the end bearing that is fixed on the frame, intermediate bearing supports, and on axle, be provided with servomechanism and linear bearing, between servomechanism and the linear bearing, be provided with and make its group be the link of kinematic pair, be respectively equipped with on the link a small amount of ray is passed, satisfy the gate that the interpolation needs have slit, stitch wide 0.1-1mm, spacing 5-10mm, frame is provided with the position detector that is used to detect mechanical transmission mechanism initial position and extreme position.In the intelligence controlling device, include servo controller, servomechanism, servomotor, position detector and incremental encoder, wherein servo controller contains the digital circuit with FPGA function, the bus buffer digital circuit that is mated, digital circuit with ISPPROM function, difference sends digital circuit and optocoupler digital circuit, and be connected with the position detecting circuit of forming by optoelectronic switch by relevant interface, in the intelligence controlling device outside each separate unit electric connecting relation be that servo controller passes through interface DZ ₁Accept the parameter input, the P-pulse of the output on this device, direction of motion signaling interface DZ ₂With servomechanism interface CN ₁/ F links to each other, and it drives output interface DZ ₃With servomotor input end DZ ₄Link to each other the output interface DZ on the incremental encoder ₇CN1/F links to each other with the servomechanism interface, and linking to each other with incremental encoder of servomotor machinery derives from the position detector interface DE of mechanical transmission mechanism position signalling ₅With servo controller interface DE ₆Link to each other.

Owing to be provided with intelligence controlling device and the mechanical transmission mechanism that is subjected to this device Control work in the utility model, therefore have compared to existing technology: the person under inspection is reduced radiation, intelligent change beam fan-beam position of center line, the fan-beam width, minimizing is to person under inspection's irradiated area, shorten irradiation time, only shone at examining organ, response speed is fast, accurate positioning, the advantage that picture quality is good.

Description of drawings

Fig. 1 is a kind of and the supporting intelligent scanning beam-defining clipper mechanical drive principle synoptic diagram of radiographic source,

Fig. 2 is Fig. 1 physical construction synoptic diagram,

Fig. 3 is servo controller function and a signal transmission block scheme among Fig. 1,

Fig. 4 is that the servo controller function element is electrically connected synoptic diagram among Fig. 1,

Fig. 5 is the outside telecommunications connection diagrams of each parts of intelligent scanning beam-defining clipper intelligence control system.

1 end bearing among Fig. 1-5,2 gates, 3 links, 4 servomechanisms, 5,6 linear bearings, 7 intermediate bearings, 8 shaft couplings, 9 servomotors, 10 servo controllers, 11 frames, 12 position detectors, DZ ₁, DZ ₆The servo controller input interface, DZ ₂The servo controller output interface, CN1/F servomechanism input interface, DZ ₃The servomechanism output interface, DZ ₄The servomotor input interface, DZ ₅The position detector output interface, DZ ₇Incremental encoder output interface, XC2S150 are the FPGA integrated circuit, and DM74ALS245 is the bus buffer integrated circuit, XC18V02 is the ISPPROM integrated circuit, SN74LS540 is a bus buffer circuit, and 26LS31 is the difference transtation mission circuit, and TCPS521-1, TLP521-4 are optic coupling element.

Embodiment

By Fig. 1-5 as can be known with the supporting intelligent scanning beam-defining clipper of radiographic source mainly by mechanical transmission mechanism, controlling the intelligence controlling device of this mechanism's work forms, mechanical transmission mechanism wherein, on frame 11, be provided with two groups of axles 5 that link to each other with servomotor 9 by shaft coupling 8, hold this whole story respectively by the end bearing 1 that is located on the frame 11, intermediate bearing 7 supports, be respectively equipped with servomechanism 4 on the axle 5, linear bearing 6, between servomechanism 4 and the linear bearing 6, be respectively equipped with link 3, wherein link 3 is provided with gate 2, frame 11 is provided with the position detector 12 that is used to detect mechanical transmission mechanism initial position and extreme position, have on the gate 2 a small amount of ray is passed, satisfy the slit of interpolation needs, its slit width 0.1-1mm, slit separation 5-10mm, intelligence controlling device includes servo controller 10, servomechanism 4, servomotor 9, position detector 12 and incremental encoder, wherein be provided with the XC2S150 element in the servo controller 10 and constitute the FPGA integrated circuit, the DM74LS245 element constitutes the bus buffer integrated circuit, the XC18V02 element constitute the ISPPROM integrated circuit and, the SN74LS540 element constitutes bus buffer circuit, the 26LS31 element constitutes the difference transtation mission circuit, the TCP521 element constitutes photoelectric coupled circuit, its annexation as shown in Figure 4, furtherly: a DM74ALS245 element A1-A8 end is wherein pegged graft with servo controller interface DZ1 B-J hole, the B1-B8 end is pegged graft with XC2S150 element 67-75 hole, another DM74ALS245 element A1-A7 end is pegged graft with servo controller DE1 interface S-Z hole, the B1-B7 end is pegged graft with XC2S150 element 81-83 and 86-89 hole, XC18V02 elements T D0, TD1, TMS, GND, the TCK end is pegged graft with interface X1 corresponding aperture name respectively, CLK on this part, DO, CEO, OE/RECET; CCLK hole on CF end and the XC2S150 element, the DIN hole, the DONE hole, the INTT hole, peg graft in the PROGRAM hole; XC2S150 element 1/094-1/091 end is by position detector interface DZ ₅With servo controller interface DZ ₆The co-located testing circuit links to each other, 1/089-1/088 end respectively with the 26LS31 element on INA, the INB end links to each other, Y2, Y3 end on 1/081-1/080 and the SN74LS540 element links to each other, A1 end on 1/087 end and the SN74LS540 element links to each other, Y1 end on the SN74LS540 element links to each other with the light diode on the TLP521-1 element, and A2, A3 end links to each other with TLP521-4 element capacitance-resistance junction point, as servo controller output interface DZ ₂With OVTA, the OVTA0 on the 26LS31 element, OVTB1, OVTB0 end with 24ENIN on TLP521-1 element end, links to each other with light pipe D12C, D12D end on the TLP521-4 element.

Intelligence controlling device includes servo controller 10, servomechanism 4, servomotor 9, position detector 12 and incremental encoder, and its external electrical annexation is that servo controller 10 passes through DZ ₁Interface is accepted parameter input, the interface DZ on the servo controller 10 ₂With the interface CN on the servomechanism 4 ₁/ F links to each other, its drive output DZ ₃Interface and servomotor input end DZ ₄Interface links to each other, the output interface DE on the incremental encoder ₇Link to each other with servomechanism 4CN1/F interface, derive from the position detector interface DZ of mechanical transmission mechanism position signalling ₅With servo controller 10 interface DE ₆Link to each other.

Servomechanism, servomotor and incremental encoder adopt MAT's product.

During work, servo controller 10 is by interface DZ ₁Accept the parameter input, according to the information that position detector 12 provides, servo controller 10 is judged, is calculated, and passes through DZ ₂Interface output position pulse and direction of motion control signal, control servomechanism 4 mechanisms are according to the control information of input, and the input information of incremental encoder judges whether the position puts in place, if do not put incremental encoder output terminal DZ in place ₇Signal is exported to servomechanism 4 interface CN1/F, and the control servomotor rotates, thereby drives gate, changes beam fan-beam position of center line and fan-beam width.

This intelligent beam-defining clipper not only is used for the CT machine, also can be used on other detection machine that utilizes X-ray detection X object dimensional variable.

Claims

One kind with the supporting intelligent scanning beam-defining clipper of radiographic source, it is characterized in that it is by being made up of the intelligence controlling device of mechanical transmission mechanism and Based Intelligent Control beam fan-beam center and fan-beam width, wherein mechanical transmission mechanism contains: two groups of axles that link to each other with servomotor by shaft coupling, hold this whole story respectively and support by the end bearing and the intermediate bearing that are fixed on the frame, axle is provided with servomechanism and linear bearing, being provided with between two groups of servomechanisms and the two groups of linear bearings makes its group be the connection support of kinematic pair, be respectively equipped with gate on this, intelligence controlling device: include servo controller, servomechanism, servomotor, position detector and incremental encoder.
2. according to claim 1 and the supporting intelligent scanning beam-defining clipper of radiographic source is characterized in that having on the said gate a small amount of ray is passed, and satisfy the slit of interpolation needs, stitch wide 0.1-1.0mm, spacing 2-10mm.
3. according to claim 1 and the supporting intelligent scanning beam-defining clipper of radiographic source is characterized in that said frame is provided with the position detector that is used to detect mechanical transmission mechanism initial position and extreme position.
4. according to claim 1 and the supporting intelligent scanning beam-defining clipper of radiographic source, it is characterized in that the servo controller in the said intelligence controlling device includes the digital circuit of FPGA function, the bus buffer digital circuit that is mated, digital circuit with ISPPROM function, difference sends digital circuit and optocoupler digital circuit, and is connected with the position detecting circuit of being made up of optoelectronic switch by relevant interface.
According to claim 1-4 described with the supporting intelligent scanning beam-defining clipper of radiographic source, it is characterized in that the servo controller in the said intelligence controlling device, electric connecting relation is outside servomechanism, servomotor, position detector and the incremental encoder: the interface DZ on the servo controller ₁Accept the parameter input, interface DZ ₂The interface CN of output position pulse and direction of motion signal and servomechanism ₁/ F links to each other, its drive output interface DZ ₃With servomotor input end interface DZ ₄Link to each other incremental encoder interface DZ ₇With servomechanism interface DN ₁/ F links to each other, and servomotor links to each other with incremental encoder machinery, derives from the position detector interface DE of mechanical transmission mechanism position signalling ₅With servo controller interface DE ₆Link to each other.