CN1274844A - Method of obtaining X-ray digital image - Google Patents
Method of obtaining X-ray digital image Download PDFInfo
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- CN1274844A CN1274844A CN 00112889 CN00112889A CN1274844A CN 1274844 A CN1274844 A CN 1274844A CN 00112889 CN00112889 CN 00112889 CN 00112889 A CN00112889 A CN 00112889A CN 1274844 A CN1274844 A CN 1274844A
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Abstract
The digitization of X-ray image for further image treatment has important significance in the improvement of medical image diagnosis level, and video X-ray image is the basis of digital x-ray image treatment. The method of obtaining digital X-ray of the present invention features that after the low-illuminance visual image is produced in a X-ray screen by the X-ray emitted by a X-ray apparatus and passed through some measured body, it is taken directly by a high-sensitivity video camera and the obtained video image is A/D converted to obtain digital X-ray image. The present invention has the obvious advantages of high resolution, high image quality, simple structure and low cost.
Description
The present invention relates to be applicable to that X-ray is a kind of method of obtaining the X-ray digital picture in medical image diagnosis and X-ray industrial flaw detection field.
The main method of obtaining the X-ray video image at present is to adopt the X-ray reinforced pipe, promptly by on the cutout screen of X-ray reinforced pipe with X-ray video centralized displaying to about one square inch of size, then with the resolution picked-up cutout screen of video camera with 300 lines, obtain x-ray image, the vision signal of output analog quantity shows on monitor.The X-ray reinforced pipe is worked under extreme operating condition conditions such as the high voltage more than 50,000 volts, high vacuum, high brightness cutout screen, has that resolution is low, cost is high, shortcomings such as stability and reliability difference.
The objective of the invention is: the remarkable advantage that provide a kind of and have the resolution height, cost is low, working stability is reliable etc., and cancellation X-ray reinforced pipe directly absorbs the method for x-ray image.
Above-mentioned purpose of the present invention is to realize by such technical scheme, it is a kind of method of obtaining the X-ray digital picture, it is characterized in that: that adopts that X-ray sensitization screen receives that the X-ray emitter sends produces low illumination visible images through the X ray of measured body, adopt the high sensitivity gamma camera directly to absorb X-ray sensitization screen image, video signal is imported computing machine or similar device through A/D conversion back and is obtained the X-ray digital picture.
Because the wide-angle lens of the image in the sensitization screen by high aperture ratio incides imaging on the CCI target surface of high sensitivity video camera, its resolution can reach 800 * 600 points, 256 grades of gray levels, thereby have resolution height, good imaging quality, simple in structure, obvious advantage such as price is low.
The present invention compares with the method that the employing X-ray reinforced pipe of continuing to use at present obtains X-ray video views picture, and resolution can reach 800 * 600, i.e. 600 lines.The error that aberration causes in the optical system during small size cutout screen image of the X-ray reinforced pipe that compares picked-up 2.5 * 2.5Cm only can reach the resolution of 300 lines, and its resolution can improve a lot.And cost of the present invention only is 1/5th of an X-ray reinforced pipe.And avoided extreme condition operating modes such as the high voltage more than 50,000 volts, high vacuum, high brightness cutout screen in the X-ray reinforced pipe, job stability and reliability are all improved a lot, average no-failure operation can reach 10000 hours at interval.
The present invention can further specify by accompanying drawing.
Accompanying drawing is a schematic diagram of the present invention.
Referring to accompanying drawing: X ray transmitter X launches X ray among the figure, behind detected human body B, shines on the video screen F, produces the visual picture of inside of human body tissue, and its illumination is 1.2 * 10
-4～1.6 * 10
-4In candle light (Cd) scope, the visible light image on the video screen is through high-aperture lenses L imaging, and its illumination can reach 7 * 10
-3～2 * 10
-2Lux, the camera lens imaging is on the target surface of high sensitivity image sensor, and the imaging illumination that produces the selected high sensitivity visual detector of video signal is 7 * 10
-3～2 * 10
-2Lux guarantees to produce reliably the video image that gray level reaches 256 grades.This video image becomes the X-ray data image signal after the A/D conversion, by Computer Storage and processing.
At present, the illumination of the visible light x-ray image of enhancement mode X-ray sensitization screen generation is 1.6 * 10
-4Candle light (Cd), wavelength are 4120A, and the illumination of plain edition X-ray sensitization screen is 1.2 * 10
-4Cd, wavelength are at 4650A, and when extensive angle camera lens visual angle was 110 °, the stop opening ratio was 1.2, and the aperture ratio can reach 0.8 when the visual angle was 90 °, and the luminous flux of wide-angle lens outgoing directional light is 10
-2Lumen (Lm), the target surface area that solid-state high sensitivity photography resembles machine is 8 * 6mm, 50mm
2, minimum imaging illumination is 5 * 10
-4Lux (Lux), standard imaging illumination is 2 * 10
-3Lux.The illumination that reaches the gamma camera target surface when adopting 100 ° of visual angle camera lenses and common photosensitive screen is 7 * 10
-3Lux can reach 2 * 10 when experiencing optical screen with 90 visual angle camera lenses and enhancement mode
-2Lux all greater than the standard imaging illumination of video camera, can guarantee to obtain high-quality X-ray video image.The signal to noise ratio (S/N ratio) of video signal is 70 decibels (db) under standard imaging illumination state, level far below the X-ray reinforced pipe, can suitably reduce the amount of gain of system when inciding the illumination overgauge imaging illumination of video camera target surface, signal to noise ratio (S/N ratio) also can further descend.
The present invention is applicable in X-ray medical imaging diagnosis and the X-ray industrial flaw detection and obtains the X-ray digital picture.
Claims (2)
1. method of obtaining the X-ray digital picture, it is characterized in that: adopt that X-ray sensitization screen receives that the X-ray emitter sends through the X ray of measured body and generation low-light (level) visible images, adopt the high sensitivity video camera directly to absorb X-ray sensitization screen image, the X-ray video figure signal picture that obtains is imported computing machine or similar device through A/D conversion back and is obtained the X-ray digital picture.
2. a kind of method of obtaining the X-ray digital picture according to claim 1 is characterized in that: adopt picture pick-up device to comprise all kinds of solid-state imaging apparatus, low-temperature working class imaging device, image dissector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00112889 CN1274844A (en) | 2000-04-30 | 2000-04-30 | Method of obtaining X-ray digital image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00112889 CN1274844A (en) | 2000-04-30 | 2000-04-30 | Method of obtaining X-ray digital image |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1274844A true CN1274844A (en) | 2000-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00112889 Pending CN1274844A (en) | 2000-04-30 | 2000-04-30 | Method of obtaining X-ray digital image |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101044983B (en) * | 2006-03-31 | 2010-12-15 | 上海金根光电技术有限公司 | Imaging method for medical used digital, computer image |
| CN102258372A (en) * | 2010-05-24 | 2011-11-30 | 北京核海高技术有限公司 | Application of image superposition technology to detection of density values of bone minerals |
| CN109239111A (en) * | 2018-08-17 | 2019-01-18 | 河北省特种设备监督检验研究院 | A kind of pipeline weld joint nondestructive inspection device |
-
2000
- 2000-04-30 CN CN 00112889 patent/CN1274844A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101044983B (en) * | 2006-03-31 | 2010-12-15 | 上海金根光电技术有限公司 | Imaging method for medical used digital, computer image |
| CN102258372A (en) * | 2010-05-24 | 2011-11-30 | 北京核海高技术有限公司 | Application of image superposition technology to detection of density values of bone minerals |
| CN109239111A (en) * | 2018-08-17 | 2019-01-18 | 河北省特种设备监督检验研究院 | A kind of pipeline weld joint nondestructive inspection device |
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