KR20040066235A - X-ray photographing apparatus and driving method thereof - Google Patents

Abstract

PURPOSE: An X-ray system using a scan method and a controlling method thereof are provided to detect easily image information of a subject by improving a structure of the X-ray system. CONSTITUTION: An X-ray system using a scan method includes an image signal detector, a scan transfer unit, and an image signal processor. The image signal detector(210) is used for detecting signals corresponding to X-rays radiated from an X-ray generator. The scan transfer unit(230) transfers the image signal detector within a predetermined range. The image signal processor(270) is used for controlling the scan transfer unit to scan a target region and generating the image information by mapping image signals of an image signal generator according to each scan line.

Description

Scan-type X-ray photographing apparatus and control method thereof X-ray photographing apparatus and driving method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scan type x-ray photographing apparatus and a control method thereof, and more particularly, to a scan type x-ray photographing apparatus and a control method thereof having a simplified structure for detecting image information corresponding to radiation passing through a subject.

X-ray imaging apparatus is widely used as a medical device for photographing the internal structure of a subject such as a human body or an animal.

Conventional X-ray imaging apparatus has been used a method for imaging the internal structure of the subject using a photosensitive film that is radiated from the X-ray generator and is sensitive to radiation passing through the subject. Such an X-ray photographing apparatus has a problem that it is difficult to obtain high resolution image information due to low sensitivity to X-rays of the photosensitive film.

In order to solve this problem, recently, a technology for obtaining higher resolution image information by adding a member to generate visible light in response to radiation passing through a subject has been developed.

However, such conventional X-ray imaging apparatuses generally have an element size for detecting an image signal having a size of a chest region so that image information corresponding to an imaging area of a chest size of an adult can be obtained at a time. As a result, the size of the device becomes larger and complicated.

In addition, when imaging an area relatively smaller than the imageable area, imaging is performed on the entire imageable area, thereby causing radiation to be exposed to the human body to an area more than necessary.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and more particularly, the present invention provides a scan type X-ray photographing apparatus and a control method thereof, which can simplify a structure for detecting image information of a subject.

Still another object of the present invention is to provide a scan type x-ray photographing apparatus and a control method thereof, in which imaging can be performed only on an area to be captured.

1 is a block diagram showing a scanning x-ray imaging apparatus according to a preferred embodiment of the present invention,

2 is a cross-sectional view illustrating an example of the image signal detector of FIG. 1.

3 is a cross-sectional view illustrating another example of the image signal detector of FIG. 1;

4 is a perspective view illustrating an example of a transfer unit for transferring the image signal detection unit of FIG. 1;

FIG. 5 is a fragmentary front view for explaining an imaging process by the image signal detector of FIG. 4.

6 is a perspective view schematically showing an x-ray imaging apparatus according to another embodiment of the present invention;

FIG. 7 is a partial excerpt side view showing an example of the transfer unit of FIG. 6. FIG.

<Description of Symbols for Main Parts of Drawings>

100: x-ray generator 210: image signal detection unit

230: scan transfer unit 270: image signal processing unit

In order to achieve the above object, a scan type X-ray photographing apparatus according to the present invention includes an image signal detector for detecting a signal corresponding to X-rays radiated from an X-ray generator and passed through a subject; A scan transfer unit configured to transfer the image signal detection unit within a preset scan range; An image signal processor configured to control the scan transfer unit to scan the image capturing region set by the image signal detector, and generate captured image information of a subject by mapping a signal generated for each scan line from the image signal generator; Equipped.

According to an aspect of the present invention, the image signal detection unit and a fluorescent screen for emitting visible light corresponding to the incident X-rays; And a camera installed to receive the light beams generated by the fluorescent screen, and generating an electrical signal corresponding to the incident light beam information and outputting the electrical signal to the image signal processor.

According to another aspect of the invention, the image signal detection unit and the first electrode layer; An organic conductive polymer layer formed on an upper surface of the first electrode layer and generating an electron hole pair by incident light; A second electrode layer formed on an upper surface of the organic conductive polymer layer; A panel connected to each electrode of the first electrode layer under the first electrode layer to detect an electrical image signal corresponding to generation of the electron hole pair in the organic conductive polymer layer; And a fluorescent screen positioned on an upper surface of the second electrode layer.

The panel includes a unit TFT cell connected to each electrode of the first electrode layer, the unit TFT cell comprising a capacitor connected to each electrode of the first electrode layer; And a transistor connected to output an electrical signal corresponding to the charge accumulated in the capacitor according to the trigger signal of the gate terminal.

The apparatus may further include a beam adjuster for adjusting the emission direction of the X-ray generated by the X-ray generator to correspond to the scan movement direction of the image signal detector.

The beam adjuster includes a pinhole member installed in front of the beam exit port of the X-ray generator; And a pinhole transfer unit configured to drive the through hole of the pinhole member to move up and down in a direction perpendicular to the beam exit port.

More preferably, the bed frame provided with the image signal generation unit and the scan transfer unit; Support frame; And a pivoting / elevating linkage device installed between the support frame and the bed frame so that the bed frame can be lifted and lowered in association with the pivoting and pivoting at a distance from the support frame.

Preferably, the pivoting device is provided with a first shaft installed in the support frame to be rotated by a drive source; A rack gear installed in the bed frame to be engaged with the pinion gear installed at one end of the first shaft; A guide portion formed on an outer circumferential surface having a circular arc and installed to be rotatably supported on the first shaft and coupled to the bed frame such that the bed frame can slide in a restrained state; And a rotation gear unit installed in the support frame and engaged with the outer main gear of the guide unit to rotate and rotate the guide unit.

In addition, the control method of the X-ray photographing apparatus according to the present invention to achieve the above object is an X-ray generating unit for generating X-rays, a beam controller for controlling the emission direction of the light beams generated by the X-ray generator, and through the beam adjuster The image signal detection unit for detecting a signal corresponding to the X-rays passing through the subject, a scan transfer unit to move the image signal detection unit within a set movement range, and the image signal detection unit to scan the imaging portion A control method of an X-ray photographing apparatus, comprising: an image signal processor configured to control a scan transfer unit and the beam adjuster to generate captured image information of a subject. Setting a scan area for a subject by operating an input device of the image signal processor; I. Controlling the beam adjuster and the scan transfer unit to move the emission direction of the X-rays according to the scanning order corresponding to the set scan target area and to move the image signal detection unit corresponding to the emission movement direction of the X-rays; All. And generating image information of a subject by mapping the signal detected by the image signal detector.

Hereinafter, a scan type x-ray photographing apparatus and a control method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a scanning x-ray imaging apparatus according to a preferred embodiment of the present invention.

Referring to the drawings, the X-ray photographing apparatus includes an X-ray generator 100, an image signal detector 200, and an image signal processor 270.

The X-ray generator 100 includes an X-ray generator 110 and a beam controller 120 for generating X-rays.

X-ray generator 110 may be applied to a variety of known structures that can emit X-rays. For example, the X-ray generator 110 may include tungsten and molybdenum on the surface of the anode 113 and the anode 115 and the cathode 115 opposed to the cathode 113, which are spaced a predetermined distance inside the vacuum tube, as shown. An X-ray tube having an opposite electrode 117 formed of or the like may be applied. In the X-ray generator 110 having such a structure, when a voltage of tens of thousands of volts is applied to the anode 115, hot electrons emitted by heating from the cathode 113 move toward the anode 115 at a high speed, and then the opposite electrode ( The energy of the hot electrons is converted into X-rays and emitted while colliding with 117.

The beam adjuster 120 is installed to face the beam exit direction of the X-ray generator 110 so that a part of the beam exiting the X-ray generator 110 with a predetermined angle of divergence is selectively transmitted and emitted. The direction can be controlled to correspond to the transfer of the video signal detector 210.

The beam adjuster 120 includes a pinhole member 121 having a through hole 121a of a predetermined size and a pinhole for controlling the transfer of the pinhole member 121 perpendicular to the beam exit port of the X-ray generator 110. The transfer part 125 is provided. Therefore, when the beam adjuster 120 is vertically transferred and controlled, the beam exit direction can be controlled in a desired direction. The through hole 121a of the pinhole member 121 is preferably formed in a rectangular shape corresponding to the number of lines simultaneously scanned at one time.

More preferably, the pinhole member 121 is formed to adjust the size of the through hole 121a by the control of the pinhole transfer part 125. As an example of the size adjustment structure of the through hole 121a of the pinhole member 121, the pinhole member 121 may be formed of a plurality of partition plates that may partially overlap each other, and the through holes may be formed according to the degree of overlap of the plurality of partition plates. 121a) may be formed to be adjustable in size, and may be formed in a conventional aperture structure in which the dividers may be symmetrically advanced and revolved about the centering center point by the centering method.

The beam manipulator 120 provides an advantage of optimizing the exposure amount of the radiation to the subject by adjusting the exposure amount of the radiation to match or the appropriate area to the unit scan target region of the subject.

The feed rate of the pinhole member 125 is a center point of the opposite pole 117 of the X-ray generator 110, in which the through hole 121a of the pinhole member 121 is a source of radiation, and the image signal of the image signal detector 210. It may be controlled to be positioned on the line connecting the center of the signal detection surface.

Unlike this, the pinhole member 121 is fixedly installed with respect to the X-ray generator 110, and the X-ray generator 100 is controlled and transferred to the image signal processor 270 to correspond to the scan area of the image signal detector 210. It is a matter of course that the way to make it.

Alternatively, while the beam adjuster 120 is omitted and the X-ray generator 110 is fixed, the scan target region may be fastened so that the scan speed of the image signal detector 210 is less than the allowable radiation dose to the human body. It goes without saying that a method of allowing imaging of the subject to be carried out while transferring may be applied.

The image signal detector 200 includes an image signal detector 210 and a scan transfer unit 230.

The image signal detector 210 may detect image information corresponding to X-rays radiated from the X-ray generator 100 and passed through the subject.

An example of the image signal detector 210 is illustrated in FIG. 2.

Referring to the drawing, the image signal detector 210 includes a fluorescent screen 213 and a camera 217. Reference numeral 211 denotes a mounting bracket.

The fluorescent screen 213 is made of a material capable of emitting visible light corresponding to radiation incident through the subject. The length and width of the shape screen 213 may be applied to correspond to the unit scan area processed in the stationary state.

As a material of the fluorescent screen 213, a known element that generates light in response to X-rays, for example, calcium tungstate (CaWO ₄ ) or rare earth phosphor-based Gd series, La series, and CsI (Ti), CsI (Na), NaI (Ti), ZnS, ZnS (Ag), ZnCdS, ZnCdS (Ag), Gd ₂ O ₂ S (Tb), Y ₂ O ₂ S (Tb), Y ₂ O ₂ S (Eu), etc. This can be applied.

The camera 217 is installed to receive the light emitted from the fluorescent screen 213. The camera 217 may be configured to generate image information corresponding to the received light as an electrical signal. Preferably, the camera 217 is a CCD camera to which a solid state image pickup device (CCD) is applied. In the radiation collision position of the fluorescent screen 213, the distance between the fluorescent screen 213 and the fluorescent screen 213 of the camera 217 may be determined in consideration of the characteristic in which visible light is emitted and the viewing angle of the camera 217. . The spaced installation method between the fluorescent screen 213 and the camera 217 provides an advantage of reducing the number of detection elements of the camera 217 for detecting image information.

Of course, the condenser lens may be provided on the front surface of the solid state image pickup device of the camera 217.

The camera 217 is installed to face the fluorescent screen 213, or alternatively a member capable of converting an optical path, for example, a mirror 215 between the camera 217 and the fluorescent screen 213, as shown. Can be installed on In the case of applying the mirror 215, the degree of freedom of the installation position of the camera 217 may be increased to alleviate the constraint on the layout design.

Another embodiment of the image signal detector 210 is shown in FIG. 3.

Referring to the drawings, the image signal detector has a structure in which the panel 221, the first electrode layer 223, the organic conductive polymer layer 224, the second electrode layer 225, and the fluorescent screen 226 are sequentially stacked. .

The panel 221 is a TFT (Thinfilm transistor) cell 222 which serves as a substrate and is connected to each electrode of the first electrode layer 223 on a pixel basis to output a signal corresponding to the amount of charge accumulation for each pixel. Many arrays. The TFT cell 222 includes a capacitor 222a connected to correspond to each electrode arrayed on the first electrode layer 223, and a capacitor 222a so as to output a signal corresponding to the amount of charge accumulated in the capacitor 222a. The connected transistor 222b is provided. Reference numeral 222c denotes a signal reading trigger terminal commonly connected to the gate terminal of the transistor 222b of each TFT cell 222, and 222d denotes a signal output terminal of each cell 222.

The organic conductive polymer layer 224 is formed of an organic polymer composed of polyparaphenylene vinylene derivatives, polythiophene derivatives, polyparaphenylene derivatives, polysilane derivatives, polyacetylene derivatives, and polyfluoroene derivatives such as polyvinylcarbazole. It is desirable to be.

The organic conductive polymer layer 224 formed of such a material generates electron-hole pairs for radiation or visible light.

At least one second electrode layer 225 is arrayed in a direction perpendicular to each electrode of the first electrode layer 223. Preferably, when applying a single line scan structure in which pixels are arranged in one direction, the first electrode layer 223 may be formed to be spaced apart by the number of pixels set along the first direction, and the second electrode layer 225 may be disposed in the first direction. Accordingly, the first electrode layer 223 may be formed as a single electrode extending to face the electrodes of the first electrode layer 223.

Each electrode of the first electrode layer 223 and the second electrode layer 225 is preferably formed of ITO.

The fluorescent screen 226 is a material capable of generating visible light corresponding to incident radiation, that is, the above-described calcium tungstate (CaWO ₄ ) or rare earth phosphor-based Gd series, La series, and CsI (Ti). , CsI (Na), NaI (Ti), ZnS, ZnS (Ag), ZnCdS, ZnCdS (Ag), Gd ₂ O ₂ S (Tb), Y ₂ O ₂ S (Tb), Y ₂ O ₂ S (Eu ) May be applied.

On the other hand, since the organic conductive polymer layer 224 is less responsive to visible radiation than radiation, but generates an electron-hole pair, the fluorescent screen 226 may be omitted if a high resolution is not required.

The image signal detector having such a structure generates an electron-electron pair generated in the organic conductive polymer layer 224 in response to the incident radiation, and corresponds to a charge transferred by an electric field applied between the electrode layers 223 and 225. By accumulating in the capacitor 222a, an electrical signal corresponding to the accumulated charge can be output.

It is preferable that the image signal generator 210 has a structure capable of acquiring image information for one line.

The scan transfer unit 230 transfers the image signal detector 210 according to the set scan direction.

An example of the scan transfer unit 230 for transferring the image signal detector 210 will be described with reference to FIG. 4.

Referring to the drawings, the housing 210a of the image signal detector is installed to be linearly reciprocated with respect to the elevating guide frame 232.

The bracket 210a of the image signal detector 210 is equipped with the elements of the image signal detector 210 described above.

The scan transfer unit 230 includes a motor 231, a lifting guide frame 232, an interference nut 233, and a ball screw 234, which are driving sources.

Guide rails 232a and coupling grooves 210b for guiding sliding are formed on side surfaces of the elevating guide frame 232 facing each other and the housing 210a of the image signal detector.

The interference nut 233 is coupled to the housing 210a of the image signal detector and inserted into the ball skew 234. The ball screw 234 is driven by the motor 231.

Accordingly, in the scan transfer unit 230, the housing 210a of the image signal detection unit moves along the guide rail 232a of the elevating guide frame 232 by the rotation of the ball screw 234 driven by the motor 231. It will descend.

The scan transfer unit 230 may install a motor and a pinion gear (not shown) in a different manner from the illustrated structure, for example, the image signal generator 210, and engage and engage the pinion gear in a vertical lift frame (not shown). Various methods may be applied, such as a method in which the image signal generator 210 may be lifted and lowered by an installed rack gear, and a method of coupling the housing of the image signal detector to a chain (not shown) that drives orbits. Of course.

Meanwhile, to apply the method of transferring the X-ray generator 100 corresponding to the scan area of the image signal detector 210, the X-ray generator 100 installed to face the image signal detector 200 as shown in FIG. 4. In addition, it can be applied in the same manner as the lifting structure of the image signal detector 200. Elements having the same function as the transfer structure of the image signal detector 210 with respect to the transfer structure of the X-ray generator 100 are replaced with the same reference numerals.

As illustrated in FIG. 5, the X-ray photographing apparatus having such a structure may obtain the imaging information of the subject of the scan area by processing the scanned data for each line while transferring the image signal detector vertically. That is, when the area corresponding to the line Sm to the line Sm + n is set to be scanned, the image signal detection unit is moved in the direction indicated by the arrow while mapping the scanned data for each line, and the entire area of the set area is scanned. You can get the video information.

The video signal processor 270 that processes a signal output from the video signal detector 210 includes a controller 271, an input device 273, a display device 275, and a memory device 279.

The input device 273 is provided with an input key (not shown) that can set various function settings required for obtaining imaging information, such as setting the initial position and end position of the scan target, and a scan start key.

The display device 275 controls the control unit 271 to display the received display information.

The storage device 279 is controlled by the control unit 271 to perform recording of the recording target information and reading of the recorded data.

The control unit 271 processes a command set by the input device 273 and controls each element.

The controller 271 performs the imaging mode when the scan start key signal is input after the imaging area is set through the input device 273. The control unit 271 controls the scan transfer unit 230 so that the image signal detector 210 scans the set imaging area in the imaging mode, and maps the signal output from the image signal detector 210 to the storage device 279. The data corresponding to the recorded and recorded image information is displayed on the display device 275.

The printer 277 is controlled by the controller 271 to print the image information displayed through the display device 275 or the image information recorded in the storage device 279 on the print medium. When the structure for transferring the X-ray generator 100 together with the image signal detector according to the scan area is applied, the controller 271 controls the image signal detector 210 and the X-ray generator 100 to be transferred respectively.

On the other hand, such an X-ray photographing apparatus is preferably structured to be able to perform imaging for each of the granularity and the vortex for the subject.

A preferred embodiment of the X-ray imaging apparatus capable of granular / contour imaging is shown in FIG. 6. Elements having the same function as in the above-described drawings are denoted by the same reference numerals.

Referring to the drawings, the x-ray photographing apparatus includes a support frame 310, a bed frame 500 and a pivoting / elevating interlock device coupled to be rotatable and lifted relative to the support frame 310.

The rotation / elevation interlock device includes a motor 411, a guide part 430, and a rotation gear part as a driving source.

The first shaft 441 is installed along the horizontal direction at a predetermined height so as to be rotatable in the tower housing 315 installed at the predetermined height in the support frame 310.

A pinion gear 443 is provided at one end of the first shaft 441, and a power relay gear 445 is provided at the other end.

The power relay gear 445 installed on the first shaft 441 may include a relay gear 449 and a chain (449) formed on the second shaft 447 installed in parallel with the first shaft 441 under the tower housing 315. 451).

Reference numeral 453 denotes an idle gear for maintaining the tension of the chain 451.

The second shaft 447 is changed from the motor 411 via the reduction gear 413 to the second shaft 447 after the rotation direction is changed at right angles by a rotation direction converting means, for example, a worm gear or a bevel gear. A structure capable of transmitting power is applied. Unlike this, of course, the second shaft 447 may be directly coupled to the second shaft 447 through a rotation shaft or a reduction gear of a motor.

The guide part 430 includes a semicircular disk gear plate 431 and a guide roller 435.

The semi-circular disk gear plate 431 is formed on the outer circumferential surface having a circular arc, the outer gear 431a is formed to be rotatably supported on the first shaft 441.

The guide roller 435 is provided on the support bar 437 extending a predetermined distance from the semi-circular disk gear plate 431 in the direction of the bed frame 500.

Reference numeral 511 is a guide bar installed in the bed frame 500 to contact the guide roller 435 to guide the sliding.

The rotation gear portion includes a second shaft 447 and a rotation drive gear 448 installed at the other end of the second shaft 447 and engaged with the outer gear 431a of the guide portion 430.

A rack gear 521 is provided on the side of the bed frame 500 so as to be engaged with the pinion gear 443 installed on the first shaft 441 so as to transfer the bed frame 500 to the guide member in a straight line. .

The bed frame 500 is supported by the pinion gear 443 of the first shaft and the rotation drive gear 448 of the second shaft in the rotational direction. In addition, the bed frame 500 is slidably coupled to the semicircular disk gear plate 431 in a restrained state.

Therefore, the semi-circular disk plate 431 and the bed frame 500 supported by the semi-circular disk plate 431 are rotated by the rotation drive gear 448 which is linked to the rotation of the motor 411 which is the driving source, and at the same time the pinion gear The bed frame 500 is raised and lowered linearly with respect to the semi-circular disk plate 431 by the rotation of 444.

This lifting and lowering interlocking system can adjust the bed frame 500, which is usually manufactured to a length sufficient for an adult, to be in a granular or frosted state depending on the intended use, and the first shaft 441 for rotating the granular state. This has the advantage of lowering the separation height.

In the bed frame 500, the image signal detector 210 described above is installed to be moved within the bed frame 500.

Reference numeral 560 denotes a roller installed on an extension plate 531 extending from a bracket of the image signal detection unit 210 to guide the sliding of the image signal detection unit 210 stably.

The movement structure in the bed frame 500 of the image signal detection unit 210 is a gear spaced apart at predetermined intervals so as to move in the orbit within the bed frame 500 as shown in FIG. Of course, it is possible to apply a method of coupling with the chain 545 connected between the (541) (542). Reference numeral 547 is a motor.

The X-ray generator 100 may be coupled to the bed frame 500 or a part of the body of the image signal detector 210 transferred in the bed frame 500 according to the scan methods described above.

More preferably, the X-ray generator 100 is preferably coupled by the joint portion 150 that can be bent and rotated with respect to the bed frame 500. In this case, before the imaging object is lying on the bed frame 500, the joint 150 may be adjusted such that the X-ray generator 100 is positioned outside the bed frame 500, thereby improving user convenience.

As described so far, the scan type X-ray imaging apparatus and the control method thereof according to the present invention simplify the structure for obtaining image information of a subject, and provide an advantage in that imaging can be performed for eddy and granularity.

Claims (11)

An image signal detector detecting a signal corresponding to the X-rays radiated from the X-ray generator and passed through the subject; A scan transfer unit configured to transfer the image signal detection unit within a preset scan range; An image signal processor configured to control the scan transfer unit to scan the image capturing region set by the image signal detector, and generate captured image information of a subject by mapping a signal generated for each scan line from the image signal generator; Scan type x-ray photographing apparatus, characterized in that provided. The method of claim 1, wherein the image signal detector A fluorescent screen emitting visible light corresponding to the incident X-rays; And a camera installed to receive the light beams generated by the fluorescent screen and generating an electrical signal corresponding to the information of the light beams, and outputting the electrical signal to the image signal processing unit. The display apparatus of claim 2, wherein the video signal detector And a mirror for converting the path of the light emitted from the fluorescent screen to the camera. The method of claim 1, wherein the image signal detector A first electrode layer; An organic conductive polymer layer formed on an upper surface of the first electrode layer and generating an electron hole pair by incident light; A second electrode layer formed on an upper surface of the organic conductive polymer layer; A panel connected to each electrode of the first electrode layer under the first electrode layer to detect an electrical image signal corresponding to generation of the electron hole pair in the organic conductive polymer layer; And And a fluorescent screen disposed on the upper surface of the second electrode layer. The method of claim 4, wherein the panel is A unit TFT cell connected to each electrode of the first electrode layer, The unit TFT cell A capacitor connected to each electrode of the first electrode layer; And a transistor connected to output an electrical signal corresponding to the charge accumulated in the capacitor according to a trigger signal of a gate terminal. The scan type x-ray photographing apparatus of claim 1, further comprising a beam adjuster configured to adjust an emission direction of the X-ray generated by the X-ray generator to correspond to a scan movement direction of the image signal detector. The method of claim 6, wherein the beam adjuster A pinhole member installed in front of the beam exit port of the X-ray generator; And a pinhole transfer unit configured to drive the through-hole of the pinhole member to move up and down in a direction perpendicular to the beam exit port. The method of claim 7, wherein the image signal processing unit And the pinhole transfer unit is configured to control the pinhole transfer unit to emit a beam corresponding to a scan target area when scanning while transferring the image signal generator in a predetermined direction. The method of claim 1, A bed frame provided with the image signal generator and the scan transfer unit; Support frame; And And a rotation / elevating interlocking device installed between the support frame and the bed frame so that the bed frame can be lifted and lowered in association with the rotation and rotation at a distance from the support frame. X-ray imaging device. 10. The method of claim 9, wherein the rotation / elevating linkage A first shaft mounted to the support frame to be rotated by a drive source; A rack gear installed in the bed frame to be engaged with the pinion gear installed at one end of the first shaft; A guide portion formed on an outer circumferential surface having a circular arc and installed to be rotatably supported on the first shaft and coupled to the bed frame such that the bed frame can slide in a restrained state; And a rotation gear unit which is installed on the support frame and is engaged with the outer gear of the elevating guide unit to rotate and rotate the guide unit. An X-ray generator for generating X-rays, a beam controller for controlling an emission direction of light rays generated by the X-ray generator, an image signal detector for detecting a signal corresponding to X-rays passing through a subject through the beam adjuster, and the image An image for generating captured image information of a subject by controlling a scan transfer unit configured to move the signal detector within a set movement range, and controlling the scan transfer unit and the beam adjuster to scan the set image pickup unit In the control method of the X-ray photographing apparatus comprising a signal processor, end. Setting a scan area for a subject by operating an input device of the image signal processor; I. Controlling the beam adjuster and the scan transfer unit to move the emission direction of the X-rays according to the scanning order corresponding to the set scan target area and to move the image signal detection unit corresponding to the emission movement direction of the X-rays; All. And mapping the signal detected by the image signal detection unit to generate image information of the subject.