CN1050790A - The method of shop drawings correction mask for image intensifier tube - Google Patents
The method of shop drawings correction mask for image intensifier tube Download PDFInfo
- Publication number
- CN1050790A CN1050790A CN90108026.8A CN90108026A CN1050790A CN 1050790 A CN1050790 A CN 1050790A CN 90108026 A CN90108026 A CN 90108026A CN 1050790 A CN1050790 A CN 1050790A
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- CN
- China
- Prior art keywords
- anode
- line
- negative electrode
- light
- blackness
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
- H01J31/505—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output flat tubes, e.g. proximity focusing tubes
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Abstract
Manufacturing has the method for the effective correction mask of the proximity-focus type image intensification of rectangular cathode and anode.Image intensifier is easy to produce uneven light output to uniform negative electrode input imagery.Distribute in the output of at least one line measuring light of negative electrode uniform irradiation lower edge anode, in order to making a slide, on the output window attached to image intensifier.Slide is provided with light absorption line, and this line absorbs more light in the higher position of output window length glazing output.Absorptance is proportional to the difference between actual light output and the output of required value light, thereby makes the light output of image intensifier equal desired level.
Description
The present invention relates to the method that a kind of manufacturing has the effective correction mask of the proximity-focus type image intensification of rectangular cathode and anode.
A kind of proximity-focus type rectangle diagram image intensifier tube has been described in HOII P 183,914.This kind rectangle diagram image intensifier tube is in being usually used in so-called slit radiography method equipment.Negative electrode is to the X-radiation sensitivity under this kind situation, and anode produces output image corresponding to incident X-rays by the anode window, and the anode window may comprise an optical fibre plate.In a kind of like this purposes, anode and negative electrode can have such as the length of 40Cm and the width of 4Cm.
Produce such problem in practice, be difficult to make long so exactly and image intensifier that on whole active surface, have even conversion factor.Conversion factor is understood that to represent the ratio between the final output radiation at the incident radiation at negative electrode one side place and anode one side place.A kind of like this image intensifier also may be owing to the change localized variation of the factor of aging phenomenon in length of life.
Therefore need a kind of device that can proofread and correct the rectangle diagram image intensifier tube, conversion factor is equated.
The purpose of this invention is to provide a kind of like this device.For this reason, according to the present invention, a kind of method that is used to make the effective correction mask of proximity-focus type image intensification with rectangular cathode and anode is characterised in that, uses the radiation of target sensitivity to shine the whole surface of negative electrode basically equably; Its second is characterised in that, at the irradiation KD, the luminous intensity that anode produces is measured at least one narrow strip-type zone, and this zone extends axially along anode, luminous intensity be from anode one end distance from function; Its 3rd is characterised in that, the measured value that each strip-type zone is obtained is reproduced in the figure as empirical curve by this way; Its 4th is characterised in that, each empirical curve is determined to be similar to the required value figure line of empirical curve; Its 5th is characterised in that, the difference between empirical curve and the required value figure line is that conduct is determined from the function of the distance of anode one end; Its 6th is characterised in that, makes a transparent carrier, and it produces blackness at least in a rectangular region, and this blackness is represented the difference between empirical curve and the related request value figure line, be from anode one end distance from function.
According to the present invention, a kind of method that is used to proofread and correct the proximity-focus type image intensifier of the anode window with rectangular cathode and anode and coupling anode is characterised in that the transparent body of paying of the strip-type that produces blackness at least one rectangular region is used as mask facing to the arrangement of anode window.
Illustrate in greater detail the present invention below with reference to the accompanying drawings.
Fig. 1 schematically represents a kind of example of equipment, has used a proximity-focus type image intensifier with rectangular cathode and anode in this equipment;
Fig. 2 schematically represents the example of two figure lines, the conduct that this figure line is reproduced in the next rectangle proximity-focus type of given input signal image intensifier from pipe one end distance from the output signal of function;
Fig. 3 schematically represents an example of the correction mask that the rectangle diagram image intensifier tube is used.
Fig. 1 schematically represents a kind of example of equipment, has used a proximity-focus type image intensifier with rectangular cathode and anode in this equipment.Illustrated equipment is the equipment that a kind of slit radiography known per se is used, and in this photography, utilizes a part such as the chest of plane fan-shaped x-ray beam 3 by slit diaphragm 2 scanning patients 1.For this reason, can utilize an x-ray source 4, this radiographic source 4 can rotate around an axle, the X ray emphasis extension that this is parallel to the slit of slit diaphragm and preferably passes through x-ray source, as shown in Figure 1.
Settle an image intensifier 6 in the patient back, this pipe for example can have negative electrode 7 and the anode 8 of a long 40Cm and high 2.5Cm, image intensifier 6 moves with the scanning of X-ray beam and meets as one man same moved further, make that the plane fan-shaped x-ray beam always drops on the negative electrode of image intensifier after passing through patient.In this purposes, negative electrode is sensitive and emitting electrons to X-radiation, and the latter provides a visible output image in anode one side, and this image for example can be used to shine a photographic plate 9.
Obviously, the conversion factor of image intensifier as far as possible evenly is very important on the whole length (and height) of pipe.
In this respect, it is worthy of note, in the purposes that shows, conversion factor is a particular importance along the axial even variation of pipe because vertically right angle orientation scan and during forming image any irregularity along short transverse all be subjected to equalization.
Its less important pointing out, suggestion are arranged to conversion factor increase from anode mediad anode two ends in practice, to compensate so-called vignetting effect.At this moment, a face (for example photographic film) that is placed in the outer a distance of anode can be subjected to shining more uniformly.
It is found that the anode variation of output signals as position function of Yao Qiuing can be represented approx with parabola in practice in theory.
Fig. 2 schematically represents two figure lines, and they are reproduced in qualitatively, and conduct is from the luminous intensity C by rectangle anode generation of image intensifier one end distance from the function of X under the given negative electrode irradiation, and negative electrode irradiation is uniform along whole length.
Therefore illustrated curve representative is as the conversion factor of the function of position on the anode.
Illustrated curve has utilized light-sensitive cell to measure, and light-sensitive cell responds incident light and launches and the corresponding signal of telecommunication of incident intensity.According to the present invention, during the uniform irradiation rectangular cathode, this battery moves axially along anode, then produces the output signal of the sort of type that Fig. 2 represents, it is the representative that the image intensifier conversion factor changes.
The requirement of uniform irradiation negative electrode preferably reaches by slit-type diaphragm, the opening of diaphragm along cathode axis to right angle orientation extend, and along negative electrode axially with the same moved further of light-sensitive cell of anode one side.In this way, eliminated the possible measure error that causes by the radiating scattering that occurs in the pipe basically.
To point out in more detail as following, can advantageously scan along the axially extended many parallel bands of anode at differing heights.For this reason, can utilize an independent light-sensitive cell to move continuously along anode, perhaps utilize a many batteries band of while scan anode separately at differing heights.For example, can be in mounting one on another, settle many light-sensitive cells, then along anode by mounting, make the curve that each pipe is all produced many sort of types as shown in Figure 2.
Should be understood that the problem that also has relative motion.Therefore, on the one hand can be between static radiation source and any aperture device mobile pipe, and on the other hand also can along corresponding to anode shaft to direction move one or more light-sensitive element.
Fig. 2 A represents to change quite wide curve 20, and it has minimum value with 22 and have relative maximum 23 and 24 21, and their difference each other also is sizable.Therefore conversion factor is too little and in fact too big at 23 and 24 places at 21 and 22 places.
In order to make correction mask, at first seek as far as possible the required value figure line approximate with the curve that records 20.The required value figure line is represented the desired variation of conversion factor, and can such as be the straight line of a level.But, point out as top, preferably as the parabolical curve shown in 25 among Fig. 2 A.
Because minimum value 21 and 22 is corresponding to the positions that produce minimum amount of light on the anode,, utilize mask to proofread and correct to be only possible so have only when the required value figure line is lower than or equal the locational minimum value of minimum value 21,22 at the most.
But now same pipe is adopted a correction mask, Fig. 2 B represents one second empirical curve 26 as an example, and it has the shape of the parabolical curve 27 similar to above-mentioned curve.As can be seen, the difference between empirical curve 20 and the relevant parabolical curve 25 is significantly greater than the difference slightly between empirical curve 26 and the parabolical curve 27.
According to the present invention, in this way by decay by the light that anode produces, can obtain required degree of correction to any X value, make residual light corresponding to numerical value at the required value figure line at the correlation place of X.
In the distance X of counting from the end of the pipe that is elected to be initial point or anode
1Under the situation of Fig. 2 A, there is a difference D in the place between empirical curve and required value curve.If with X
1Relevant C value C(X
1) expression, so at position X
1Need one by anode produce according to factor D/C(X
1) optical attenuation.
Utilize one to have the mask of suitable blackness, can obtain this kind decay with plain mode at relevant position.In this way,, can determine the required decay of any X value, thereby determine the required blackness of correction mask to be made from empirical curve and required value curve.
The numerical value that records is preferably imported computer, and then computer also can determine to be proximate to the required value curve of measured value curve and the difference between measured value and the required value.If be connected on the printer, computer also can print the image of a strip-type correction mask so, and it is suitable for proofreading and correct the tested band of anode.The image that prints can be made up of a black line with plain mode, the thickness of black line changes, if this black line is on the tram of anode window front, then black line depends on more or less most of covering the tested band of anode along the thickness of highly observing.
The image that prints also can be made up of the stain grating of varied in thickness.And, the black line of above-mentioned varied in thickness also can adopt when using a computer printer usually similarly by forming.
Fig. 3 represents the example of a mask graph that has printed with aforesaid way, and this mask graph is used to proofread and correct five bands 30 to 34 in illustrated embodiment, and they extend parallel to each other, and axially has a common gap along anode.
Mask graph can be next by printing off on transparent carrier corresponding to the size of anode window size with plain mode such as photographic process, and transparent carrier is adapted to be mounted within on the outside of anode window.
The line that its thickness that Fig. 3 represents can change disconnects at 35 and 36 places.This is illustrated in does not need on those positions to proofread and correct.This may mean that also the required value curve is too high on those positions, and just more than empirical curve, and selected required value figure line may not be best required value figure line.The image check of the sort of type that can represent with Fig. 2 under actual conditions occurs is any in two kinds of situations.
Therefore can proofread and correct quite simply with aforesaid way.In addition, aging phenomenon may occur in image intensifier, after the use regular period, correction mask can replace with more stylish mask, therefore expensive longer useful life of image intensifier acquisition.
Claims (15)
1, be used to make the method for the effective correction mask of proximity-focus type image intensification with rectangular cathode and anode, it is characterized in that,
A) the whole surface of negative electrode is shone in the radiation of use target sensitivity basically equably;
B) at the irradiation KD, the luminous intensity that anode produces is measured at least one narrow strip-type zone, and this zone extends axially along anode, luminous intensity be from anode one end distance from function;) measured value that by this way each strip-type zone obtained is reproduced in the figure as empirical curve;
D) each empirical curve is determined to be similar to the required value figure line of empirical curve;
E) difference between empirical curve and the required value figure line is that conduct is determined from the function of the distance of anode one end;
F) make a transparent carrier, it produces blackness at least in a rectangular region, and this blackness is represented the difference between empirical curve and the related request value figure line, be from anode one end distance from function.
2, the method for claim 1, it is characterized in that, the required value figure line is always selected in such a way, makes that at least between corresponding to two points near the idea at anode two ends, it all has on any point than the lower value of empirical curve on this aspect.
3, method as claimed in claim 1 or 2 is characterized in that, selected parabolical curve is as the required value figure line.
As a described method in the above-mentioned claim, it is characterized in that 4, the blackness at least one rectangular region is that the figure line by varied in thickness forms.
As a described method in the claim 1 to 3, it is characterized in that 5, the blackness at least one rectangular region is that the grating by the different point of thickness forms.
As a described method in the above-mentioned claim, it is characterized in that 6, the blackness at least one rectangular region is to determine on the basis of empirical curve and required value figure line with computer, and utilizes printer prints to become the figure line of varied in thickness.
7, method as claimed in claim 6 is characterized in that, the figure line of varied in thickness is transferred on the transparent carrier with photographic process.
8, as a described method in the above-mentioned claim, it is characterized in that, by along cathode axis to the slit-type diaphragm irradiation negative electrode that extends of right angle orientation obtain the uniform irradiation of negative electrode, diaphragm and negative electrode move along negative electrode with axially being relative to each other.
As a described method in the above-mentioned claim, it is characterized in that 9, utilize at least one light-sensitive cell to measure by the luminous intensity that anode produces, light-sensitive cell and anode shaft relatively move towards each other relatively.
10, method as claimed in claim 8 or 9 is characterized in that, slit-type diaphragm and at least one light-sensitive cell and negative electrode or the same relatively moved further of anode.
11, as a described method in the above-mentioned claim, it is characterized in that, the luminous intensity that is produced by anode extends axially along anode and is measured in parallel strip-type zone, gap each other at least two, be to make a transparent carrier, it produces blackness in a rectangular region corresponding at least two banded zones.
12, be used to proofread and correct the method for the proximity-focus type image intensifier of anode window, it is characterized in that the strip-type transparent carrier that produces blackness at least one rectangular region is used as mask and settles facing to the anode window with rectangular cathode and anode celebrating coupling anode.
13, method as claimed in claim 12 is characterized in that, used mask be one according to a mask that obtains in the claim 1 to 10.
14, utilize as a mask that described method obtains in the claim 1 to 12.
15, has a rectangle diagram image intensifier tube that the anode window of mask as claimed in claim 14 has been installed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8902443A NL8902443A (en) | 1989-10-02 | 1989-10-02 | METHOD FOR MANUFACTURING A PROXIMITY FOCUS-TYPE IMAGERIZER TUBE WITH PROLIMED CATHODE AND ANODE, AND METHOD FOR CORRECTING AN IMAGE AMPLIFIER TUBE. |
| NL8902443 | 1989-10-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1050790A true CN1050790A (en) | 1991-04-17 |
Family
ID=19855383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90108026.8A Pending CN1050790A (en) | 1989-10-02 | 1990-09-29 | The method of shop drawings correction mask for image intensifier tube |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0494890B1 (en) |
| JP (1) | JPH05504016A (en) |
| CN (1) | CN1050790A (en) |
| AU (1) | AU637411B2 (en) |
| CA (1) | CA2066156A1 (en) |
| DE (1) | DE69023916D1 (en) |
| IL (1) | IL95833A (en) |
| NL (1) | NL8902443A (en) |
| WO (1) | WO1991005364A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957429A (en) * | 2016-10-14 | 2018-04-24 | 西门子医疗有限公司 | Method for generating X-ray image data |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4187002A (en) * | 1975-05-21 | 1980-02-05 | Thomson-Csf | Film for correcting spatial irregularity in the gain of optical images of intensifier tubes |
| JPS5247672A (en) * | 1975-10-15 | 1977-04-15 | Hitachi Ltd | Illuminance correction filter and manufacturing method thereof |
| NL183914C (en) * | 1979-02-02 | 1989-02-16 | Optische Ind De Oude Delft Nv | ROENTGEN IMAGE AMPLIFIER. |
| AU531837B2 (en) * | 1979-05-10 | 1983-09-08 | Kishinevsky Gosudarstvenny Universitet Imeni V.I. Lenina | Image intensifier |
-
1989
- 1989-10-02 NL NL8902443A patent/NL8902443A/en not_active Application Discontinuation
-
1990
- 1990-09-26 JP JP2513269A patent/JPH05504016A/en active Pending
- 1990-09-26 CA CA002066156A patent/CA2066156A1/en not_active Abandoned
- 1990-09-26 AU AU64154/90A patent/AU637411B2/en not_active Ceased
- 1990-09-26 EP EP90914167A patent/EP0494890B1/en not_active Expired - Lifetime
- 1990-09-26 DE DE69023916T patent/DE69023916D1/en not_active Expired - Lifetime
- 1990-09-26 WO PCT/EP1990/001642 patent/WO1991005364A1/en active IP Right Grant
- 1990-09-27 IL IL9583390A patent/IL95833A/en not_active IP Right Cessation
- 1990-09-29 CN CN90108026.8A patent/CN1050790A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957429A (en) * | 2016-10-14 | 2018-04-24 | 西门子医疗有限公司 | Method for generating X-ray image data |
| CN107957429B (en) * | 2016-10-14 | 2019-12-13 | 西门子医疗有限公司 | Method for generating X-ray image data |
Also Published As
| Publication number | Publication date |
|---|---|
| NL8902443A (en) | 1991-05-01 |
| JPH05504016A (en) | 1993-06-24 |
| WO1991005364A1 (en) | 1991-04-18 |
| AU6415490A (en) | 1991-04-28 |
| AU637411B2 (en) | 1993-05-27 |
| DE69023916D1 (en) | 1996-01-11 |
| EP0494890B1 (en) | 1995-11-29 |
| IL95833A (en) | 1994-01-25 |
| CA2066156A1 (en) | 1991-04-03 |
| EP0494890A1 (en) | 1992-07-22 |
| IL95833A0 (en) | 1991-06-30 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |