SU1030763A1 - Device for cinematographic recording of x-ray picture - Google Patents

Description

(L

with

uo o

-vj

05

with

: 2. The device according to claim 1, wherein, in order to eliminate geometric distortions of the image, due to the divergent radiation beam, the boundary between the parts of the cylinder, representing an arc in a plane perpendicular to its axis, described by parametric equations

 Q-xtos 27lp-vjc, - | -v, 2t1p po xsiH2 / cp - -us052IGr

in the coordinate system (X, Y), lying 1.. \ her in the plane of the cross section of the Cylinder with the beginning on its axis, where

: X 5- | m (111 p (/ 1 / RjT),

i: y - VR% cos (n.pR, l7R ;;: vJ -y sV

P is a parameter of the equations;

-

111 ft.

-P - iforcs.H I.

zIcK

R

Where

 cylinder radius - distance from source

The penetrations of its radiation axis of the optical fiber represent the outcrops of the direct connecting points with coordinates

.) Wh: where

 Sin

y - Rcos iTcp,

A optical fiber made afokonov.

.: The invention relates to the registration of fast processes, as well as the moving and changing their shape of objects behind opaque barriers and shells in a beam of radiation that passes through them.

The following are devices for motion picture recording of radiation images: Including a screen converter (ES) of penetrating radiation into visible AND a photo or movie camera with frame-wise registration of the LIJ visible on the screen of the image converter.

However, the registration frequency is limited to several tens of frames due to the low luminance of the EC (30 cd / m and the loss of 95-98% of light when projecting the image from the converter screen onto the film.

The closest to the invention to the technical essence is a device for recording a radiation image, comprising a radiation image screening transducer in visible, in contact with the input window of a fiber optic unit, the output window of which is made concave and aligned with the lateral surface of an optical fiber cylinder, made in a form of optical fibers regularly laid and parallel to the cross section of a cylinder, transporting a drum in contact with a fiber-optic cylinder at their core-forming through a photographic film continuously from a reel on a moving .bobinu 2

The drawbacks of the device are: the loss of light in the fiber-optic unit and in the gap between the output window of the block and the fiber-optic cylinder, which reduces the luminosity of the recorder, linear image distortion (blur, 5 blur) due to the gap between the fiber-optic unit and the cylinder as well as the fact that the device does not allow to exclude geometrical distortions of the image caused by the diverging beam of flowing radiation.

The aim of the invention is to improve image quality.

This goal is achieved by

5 that the device for recording x-ray images containing the converter screen, the fiber-optic element, the outer cylindrical surface of which is in contact with the conveying drum, is made in the form of a cylinder consisting of two parts, one of which is a cylindrical convexo-concave lens, the concave surface of which the screen converter is located; the other part in contact with the concave surface is transparent.

In addition, the boundary between the parts of the cylinder is

A 0 arc in a plane perpendicular to its axis is described by parametric equations Xp-X cos s-in 2. ": P

Vo xsih 27Gy + uso-Dr (1 j in the coordinate system (X, U) lying in the plane of the cross section of the cylinder with the beginning of its axis .. where

h-- bchg. 2l; pR), gl / vv ;. COS (, QjEpR / VR) (1) p is a parameter of the equations .TtR where R is the radius of the cylinder)) is the distance from the source of penetrating radiation to the axis of the cylinder, while the axes of the optical fibers are straight sections connecting the points with coordinates (х., у-) and Т х У in 01 о / where, „X-Rsin2ltp; y-- Rcos2frp, (3) and the optical fibers are made in the form of afocons. FIG. 1 shows the optomechanical scheme of the device / in FIG. 2 - 4 - schemes of operation. The device f in FIG. 5 to 7, the registration of an object in a divergent radiation beam j in FIG. 8 shows the configuration of the device in the case when the distance from the radiation source to the cylinder axis is infinitely large. The device contains a cylinder 1 driven in rotation around its axis, one of the parts 2 of which is made of a material that weakly absorbs penetrating radiation, and part 3 is a fiber optical element in the form of a convex-shaped cylindrical lens, the wave in which are laid regularly and parallel the transducer section 4, located at the interface of the parts of cylinder 1, the drum 5 with continuously moving along it from the reel b to the reel 7 with film 8, while the drum 5 contacts with the cylinder 1 about their image through a photographic film 8. Part of the cylinder 2 made of m Therians weakly absorbing penetrating radiation kakvdee 9. The device operates as follows: on time. In the initial position of cylinder 1, the optical fibers are rotated about the axis X (passing through the axis of cylinder 1 and the point of contact of the cylinder 1 and drum 5) at an angle of 1 pt; the radiation image in direction A is projected to point A on the screen of converter 4, converted to visible and transmitted via optical fibers to the point of contact A of cylinder 1 and drum 5 to photographic tape 8. Other sections of the radiation image are also converted on the converter screen to visible, but their visible image does not fall on the film 8. When the cylinder 1 is rotated by an angle f, .f relative to the Xj axis, the film 8 is shifted towards the reel 7; the image in the direction B is projected onto the film 8; when the cylinder 1 rotates at an angle - ppj-eAV relative to the axis X; The image in the direction C is projected onto the film 8. Thus, during the time of rotation of the cylinders idr 1 at an angle dU, the image is scanned ABC Kz film 8. The maximum size of the image projected on the film 8 is 2R, where R is the radius , cylinder 1. Accordingly, scanning, the image in this case occurs when the cylinder 1 is turned at an angle TC / 2. After the cylinder 1 is rotated by an angle) 7c: / 2, the scanning of the image is repeated. . In the case of penetration of radiation 10-12 from a source 13 located on the axis of the pipeline 14 at any inclination of the optical fibers of the fiber-optic element 3 to the point of contact of the photographic film 8 with the cylinder 1, light from the converter screen 4 enters the points of intersection of the arc 15 (marked dotted line), which simulates the location of the transducer screen 4, 1 and the actual transducer screen. As a result of image defects A, B and C lying on the same Arc with radius p, they have the same. increase factor. At the same time, the arrangement of the optical fibers of the fiber-optic element described by equations (3-) ensures that the speed of drawing the film 8 and the intersection point of the cross section of the screen of the converter 4 and the arc 15 are equal, which excludes geometrically distorted information projected from the converter screen 4 on a film 8 of the image. In the case of cx, the arrangement of the converter screen is simulated in the form of a plane perpendicular to the beam of penetrating radiation 9. The configuration of the arc and the direction of the axes of the optical fibers ensures that the cylindrical surface of radius V) with the center at the focus of the source of penetrating radiation, as well as the image sweep without geometric distortions in the direction of motion Yeni film. Thus, the proposed device provides registration with a frequency of several hundred frames and

more so that it can be used for film recording of fast processes occurring in bodies of rotation with hollow walls, as well as performing fluoroscopy (with a low recording frequency J. At the same time, the control performance increases and there is no geometric distortion compared to radiography. There are no distortions on the registered images will eliminate the need for digital image processing of computers in order to restore them, which will improve the performance of the control and pack osteitis its technology.

Claims (3)

(54 AND 57) 1. DEVICE FOR FILM RECORDING OF X-RAY IMAGES NII, containing a screen-converter, a fiber-optic element, the outer cylindrical surface of which is in contact with the transporting drum, characterized in that, in order to improve image quality, it is made in the form of a cylinder consisting of two parts, one of them represents a cylindrical convex-concave lens, on the concave surface of which a transducer screen is located, the other part in contact with the concave surface is transparent. Fig 1 2. The device according to π. 1, is cast in that in order to avoid geometric distortion of the image, .obuslovlennyh divergent beam of radiation, the interface portions of the cylinder, representing an arc in a plane perpendicular to its axis is described by the parametric _equations: (x _a - ~ y-h'so9 27sr '^ 1 _М 2кр p ₀ = XSin: 2. £ p + у'соб Θ the coordinate system (X, Y) lying in the plane of the cross section of the Cylinder with a beginning on its axis, where X '- VR ¹ + Y 51Μ (2TC), 7 = - cos (2ΈρΚ, 17О *) / '~ Ρ where ^pa R ^Р Р of the equations “о ¥ о” ^{ас% 1и} -; ==== · $. R. 917 2 CI ^ CSW —----- i the radius of the cylinder the distance from the source of penetrating radiation to the axis of the optical fibers are line segments connecting points with coordinates i * 7o) ^and (x) where x = R sin Yam ·? · Y '- KS05 2¾ and the optical fibers are made in the form of afocones.