CN1020840C - Tomographic apparatus - Google Patents
Tomographic apparatus Download PDFInfo
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- CN1020840C CN1020840C CN 85101138 CN85101138A CN1020840C CN 1020840 C CN1020840 C CN 1020840C CN 85101138 CN85101138 CN 85101138 CN 85101138 A CN85101138 A CN 85101138A CN 1020840 C CN1020840 C CN 1020840C
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- ray tube
- tube current
- ray
- switch
- circuit
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Abstract
In tomographic apparatus of the present invention, a control signal can change with time from an initial value according to a set track due to the insertion of a transistor into a lamp filament heating circuit of an X-ray tube and the arrangement of a signal generating circuit. The control signal drives the transistor; thereby, an X-ray tube current is controlled so as to change X-ray radiation energy. The present invention enables the X-ray tube to have little current fluctuation through the simple structure; thereby, the X-ray radiation energy can kept constant so as to obtain uniform images.
Description
The present invention relates to laminagraph device, particularly relate to laminagraph device with X ray control device.Variation corresponding to track takes place when X-ray tube device and developing equipment can make the x-ray bombardment amount in track operation.
As shown in Figure 1, the structure of common parallel plane formula X-ray tomograph is with X-ray tube 1 and film 2 relative configurations, and the examinee on the platform 34 is clipped in the middle, X-ray tube 1 and film 2 can be respectively with plane 6,7 that the fault plane 5 set on the optional position in examinee's 4 bodies parallels on move, and it is mobile to make both be with the central point O of fault plane 5 that symmetry is carried out at the center.Therefore, the motion track on above-mentioned plane 6,7 can adopt various tracks such as straight line, circle, ellipse, hypocycloid and helix.
But in general, the purpose of tomography is correctly to absorb the video of truncation surface.Therefore, must make to hinder the obstacle shade of correct picked-up video not obvious as far as possible, perhaps tell the obstacle shade easily.In the past in the photography of adopting profiles photographic device with multi-track, because the difference of photography position or photography track kind, sometimes the video beyond the truncation surface becomes the obstacle of picked-up truncation surface video, in order to eliminate this influence, can change the speed of X-ray tube device, or control x-ray tube current (special public clear 58-20117).But, the former structurally has a lot of difficulties, and the latter's problem is, owing in the X-ray tube filament heating circuit, insert 3 terminal amphicheirality switch elements, control x-ray tube current by phase control, it is big than the fluctuation change of hour x-ray tube current particularly to work as x-ray tube current, thereby produces non-uniform phenomenon on film.
That is to say, in tomography, along with moving of X-ray tube, depend on distance between FFD(X ray tube focus and the film at the dosage I that arrives the film face on the track optional position) cause weaken F(θ), subject cause weaken G(θ), the x-ray dose that causes of X-ray tube amount of movement changes H(θ), x-ray tube current A(θ), and can be represented by the formula:
I＝KA（θ）F（θ）G（θ）H（θ）
As shown in Figure 1, θ is the angle of inclination of X-ray tube, and K is a constant.But, F(θ) structurally can not be controlled, because G(θ) depend on that subject can not be controlled.For speak of above the former, H(θ) though can control, as mentioned above, mechanism and control thereof will become complicated.Therefore, think by control A(θ) to control I be the best way, realize the latter who just speaks of above of this method, but have aforesaid problem.
The object of the present invention is to provide such laminagraph device, promptly change x-ray irradiation dose by the control x-ray tube current, and the fluctuation of x-ray tube current is less, thereby can obtain not having the image of non-uniform phenomenon, and has the X ray control device of simple structure.
In laminagraph device of the present invention, transistor is inserted in the filament heating circuit of X-ray tube, and be provided with according to setting the signal generating circuit of track by the time dependent control signal of initial value, come driving transistors according to this control signal, thereby can change x-ray tube current so that the x-ray dose that arrives keeps certain.
The embodiment of the following stated is applicable to the present invention in the multiple road X-ray tomograph that can take various tracks.In order to take various tracks, must will rotatablely move and rectilinear motion combines, its ideograph as shown in Figure 2, X-ray tube 1 is by straight-line motion mechanism 9 and the rotational motion mechanism 8 of these straight-line motion mechanism 9 rotations is kept.In this Fig. 2, do not illustrate, film 2 is consulted Fig. 1 with central point O() be fulcrum, and couple together by rotatable connecting rod and the X-ray tube of supporting 1, when X-ray tube 1 during along various orbital motions such as helical orbits, for the motion of this X-ray tube 1, film 2 is that symmetric motion is carried out at the center with an O.In the X-ray tube laminagraph device, always generally adopt the mechanism that realizes such relative motion, therefore, do not add explanation here.
The formation of X ray control device as shown in Figure 3.In Fig. 3, the filament heating voltage is added on the filament of X-ray tube 1 by transformer 12 by power supply 11.Transistor 13 is connected on an elementary side of this filament heating circuit transformer 12, adds thermoelectric (al) power with control.This transistor 13 is driven by drive circuit 14, and the filament voltage and the control voltage that are detected by voltage detecting circuit 16 are compared through comparison circuit 17, according to its comparative result, drive circuit 14 are controlled, thereby can be controlled filament voltage.In common X ray control device, set certain control voltage of supplying with corresponding to selected track to comparison circuit 17 with switch 18 by x-ray tube current.In this embodiment, between x-ray tube current is set with switch 18 and comparison circuit 17, inserted with chain-dotted line round circuit.
Send into the add circuit that constitutes by operational amplifier 22 with switch 18 selected x-ray tube current values by the buffer that constitutes by operational amplifier 21, and with the output addition of the integrating circuit that constitutes by operational amplifier 24 and capacitor 25 etc.Switch 23 is used to set the initial value of x-ray tube current.In addition, switch 26 is to set the switch that integral constant is used according to selected track, can set the variation of x-ray tube current according to the difference of track.Switch the 27, the 28th, the switch that capacitor 25 short circuits are used, switch 27 is connected when not wishing that x-ray tube current changes.Switch 28 disconnects along with x-ray bombardment, and integral action is begun.Zener diode 29 is used to limit integral action, thereby can limit the variation of x-ray tube current.
The following describes and select arbitrary track and make the time dependent situation of x-ray tube current according to selected track.At first, utilize switch 18 to select the x-ray tube current value, next utilizes switch 23 to set the initial value of x-ray tube current value.These current values are all set according to selected track.Particularly, can set integral constant, and this integral constant can cause that the x-ray tube current that is fit to selected track changes by switch 26.Switch 27 disconnects then.When orbital motion begins, when x-ray bombardment begins, shine switch 28 and disconnect.So, the integral action of this integrating circuit just begins, and integral voltage just raises lentamente.This integral voltage in add circuit with the output voltage addition of buffer, export by add circuit by the voltage that initial value slowly raises in time, and send in the comparison circuit 17 as control signal with this.On the other hand, filament voltage is detected by voltage detecting circuit 16, and this detects voltage and above-mentioned control signal compares, and its difference is sent into drive circuit 14 by comparison circuit 17.Therefore, transistor 13 is controlled so that above-mentioned difference disappears, and x-ray tube current changes according to control signal.In this embodiment, owing to utilize integrating circuit, so x-ray tube current increases by linear in time, Zener diode 29 can make its increase stop.
When wishing that x-ray tube current is certain value, can be undertaken by following step.Utilize switch 18 to set x-ray tube current, utilize switch 23 to set initial value simultaneously, and the output voltage of add circuit is equated with the output voltage of switch 18.Then,, then do not carry out integral action, thereby added control signal just keeps initial value and constant in the comparison circuit 17 if switch 27 is disconnected.
In addition,, then can obtain the control signal that arbitrary function changes, x-ray tube current is increased by linearity, and x-ray tube current is changed by various versions if utilize function generating circuit to replace integrating circuit.
Here according to the version of predesignating x-ray tube current is changed in time, still, its basis is if carry out the selection of track, and then the variation of the time of angle θ (consulting Fig. 1) naturally and understandably just can determine.Be that angle θ is the function of time T,, control A(θ by time T with regard to following formula), thereby by control A(θ) realize that the dosage I that arrives the film face keeps certain purpose.And, control x-ray tube current by the transistor 13 that is connected in the filament heating circuit, thereby can reduce the fluctuation of x-ray tube current.
According to the present invention, by the control x-ray tube current, can keep the dosage that arrives certain, in the gamut that x-ray tube current changes, can reduce the fluctuation of x-ray tube current simultaneously, can obtain on whole drawing, not having the image of non-uniform phenomenon.In addition, adjunct circuit simple in structure is easy to realize.
Fig. 1 is the ideograph of the action of explanation laminagraph device, and Fig. 2 is the mode oblique drawing of the motion of this laminagraph device in one embodiment of the invention, and Fig. 3 is the block diagram of the X ray control device of same embodiment.
1, X-ray tube 2 ... film
3 ... platform 4 ... the examinee
5 ... fault plane 8 ... rotational motion mechanism
9 ... straight-line motion mechanism 11 ... power supply
12 ... transformer 13 ... transistor
14 ... drive circuit 16 ... voltage detecting circuit
17 ... comparison circuit
18 ... x-ray tube current is set and is used switch
21 ... the buffer operational amplifier
22 ... the addition operational amplifier
23 ... initial value is set and is used switch
24 ... the integration operational amplifier
25 ... the integration capacitor
26 ... track selects to use switch
29 ... Zener diode
Claims (1)
1, a kind of laminagraph device, the X-ray tube that wherein accompanies the relative configuration of subject can mutually reciprocal direction relatively move with display, simultaneously can set the track that relatively moves, it is characterized by and be provided with: produce corresponding to setting the signal generating circuit of track from the time dependent control signal of initial value, and insert in the filament heating circuit of above-mentioned X-ray tube, according to the driven transistor of above-mentioned control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101138 CN1020840C (en) | 1985-04-01 | 1985-04-01 | Tomographic apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101138 CN1020840C (en) | 1985-04-01 | 1985-04-01 | Tomographic apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85101138A CN85101138A (en) | 1987-01-17 |
| CN1020840C true CN1020840C (en) | 1993-05-19 |
Family
ID=4791650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85101138 Expired - Lifetime CN1020840C (en) | 1985-04-01 | 1985-04-01 | Tomographic apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1020840C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038161C (en) * | 1993-12-28 | 1998-04-22 | 张贻明 | Enlargement of characters by sample function curves |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20218138U1 (en) * | 2002-11-21 | 2004-04-08 | Heuft Systemtechnik Gmbh | X-ray system for generating short X-ray pulses and an inspection device working with such an X-ray system |
-
1985
- 1985-04-01 CN CN 85101138 patent/CN1020840C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038161C (en) * | 1993-12-28 | 1998-04-22 | 张贻明 | Enlargement of characters by sample function curves |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85101138A (en) | 1987-01-17 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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