KR100801186B1 - Quasi-Monochromatic X-Ray Filter and the X-Ray Imaging System using thereof - Google Patents

Abstract

The present invention is to select from a multi-color X-ray to a quasi-monochrome X-ray in the configuration of a conventional X-ray imaging apparatus comprising an X-ray generator and an X-ray detector so as to emit a semi-monochrome X-ray beam. Quasi-monochrome X-ray filter is included. The quasi-monochrome X-ray filter used in the present invention is to mount a plurality of the same reflector in a stack inside the housing, each reflector is made of Z heavy metal material for reflecting the X-ray of a predetermined frequency on the upper portion of the substrate A plurality of coating layers are formed of a first layer and a second layer made of a material that transmits X-rays of a predetermined frequency, and the coating layer is formed so that the X-ray beams reflected from the reflector satisfy the diffraction equation of Brac (1). When it is placed with respect to the X-ray source, it is characterized in that the thickness is gradually thickened toward the direction away from the X-ray source.

2d sin θ = nλ −---- (1).

Semi-monochrome x-ray, x-ray

Description

Quasi-monochrome X-ray filter and the X-ray imaging system using the same

1 is a schematic view of a conventional general X-ray imaging apparatus

2 is a multi-color X-ray frequency distribution diagram,

Figure 3 (a) is a photograph of the finger taken by X-ray of the 19KeV frequency

Fig. 3 (b) is a finger photograph taken with X-rays of 26 KeV frequency

Figure 4 is a sample of the quasi-monochrome X-ray filter according to the prior art,

FIG. 5 (a) is a conceptual diagram when the quasi-monochrome X-ray filter of FIG. 4 is applied;

FIG. 5B is a conceptual diagram of a range photographed in the case of FIG. 5A;

6 is an explanatory diagram of Brack's diffraction law;

7 is an explanatory diagram of a reflection mirror structure according to Bragg's diffraction law;

8 is a cross-sectional view of a conventional quasi-monochrome X-ray filter,

9 is a schematic diagram of an X-ray photographing apparatus to which the quasi-monochrome X-ray filter of the present invention is applied;

10 is a plan view of a quasi-monochrome X-ray reflector of the present invention;

11 is a cross-sectional view of a conventional quasi-monochrome X-ray reflector,

12 is a cross-sectional view of one embodiment of the quasi-monochrome X-ray reflector of the present invention;

Figure 13 is a conceptual diagram showing that the X-rays are reflected when the semi-monochrome X-ray filter of the present invention is applied,

Figure 14 is a perspective view of one embodiment of a quasi-monochrome X-ray filter of the present invention.

Explanation of Symbols in the Drawings

1: cathode, 2: filament, 3: anode, 4: target, 5: subject, 6: detector,

100: quasi-monochrome x-ray apparatus, 102: x-ray source, 104: multi-color x-ray beam,

106: quasi-monochrome X-ray filter, 108: positioning mechanism, 110: semi-monochrome X-ray beam,

112: angular velocity rotating device, 114: shutter device, 116: detector, 118: detector processor, 120: subject, 124: X-ray generator, 126: shutter control device,

200: semi-monochrome X-ray reflector 202: substrate of the reflector, 204: coating layer of the reflector,

206: proximal end of the reflector, 208: remote end of the reflector, 210: coated surface of the reflector,

300: cross section of the reflector, 302: first layer of reflector coating layer,

304: second layer of reflector coating layer, 306: one coating layer of reflector,

400: longitudinal section of the reflector, 500: filter housing, 502: slot

The present invention relates to a quasi-monochrome X-ray filter and an X-ray imaging apparatus using the same. Quasi-Monochromatic X-ray refers to a narrow band of X-rays belonging to a frequency belonging to a specific color among frequency bands belonging to the area of X-rays. The present invention relates to a filter and to an X-ray imaging apparatus using the filter to select and use such a specific semi-monochrome X-rays.

It may be theoretically possible to select only X-rays that correspond to a particular monochromatic frequency, but it is unlikely to be practically applied in view of economics. Accordingly, the present invention intends to select and use a narrow band of X-rays, i.e., quasi-monochrome X-rays, containing a specific monochromatic frequency.

X-rays are widely used for the purpose of obtaining medical information of patients in hospitals, for research in laboratories, and for securing passenger or cargo security information in airports.

As such, a schematic configuration of a general X-ray imaging apparatus widely used as shown in FIG. 1 is shown in FIG. 1. As shown in FIG. 1, X-rays are generated when electrons generated in the filament 2 of the cathode 1 strike the target 4 of the anode 3. When the X-rays generated in this way are irradiated onto the subject 5, the X-rays passing through the subject 5 form an image on the detector 6 installed behind the subject.

However, the X-rays generated by the conventional X-ray generators are polychromatic (Panchromatic or Panchromatic) X-rays of a wide frequency band. Since the multi-color X-rays have different radiation intensity and photon energy intensity according to each frequency band, as shown in FIG. 2, the multi-color X-rays are photographed using the multi-color X-rays. In this case, there are three problems.

The first problem is that the noise of the X-rays of different frequencies is not clear. When photographing subjects with multicolor X-rays, low-frequency X-rays darken the subject's shadows because they have low object permeability, while high-frequency X-rays have high whiteness, which causes the subject's shadows to be white. do. Therefore, when the subject is photographed with X-rays having such a wide band frequency, each of the X-rays having different frequencies causes noise, and the image formed on the detector is not clear.

The second problem is that it is impossible to derive the best image considering the material and characteristics of the subject. Low-frequency X-rays are well absorbed by soft tissues such as human skin and muscles, which is very beneficial for capturing soft tissues (especially early detection of cancer), while high-frequency X-rays Lines are good for shooting hard materials like bones. Figure 3 is a finger bone photograph taken by X-ray in the laboratory of Vanderbilt University (USA). Figure 3 (a) is taken with X-rays of the frequency corresponding to the photon energy 19 KeV, Figure 3 (b) is taken with X-rays of the frequency corresponding to the photon energy 26 KeV, corresponding to 26 KeV Pictures taken with frequency X-rays are much clearer. In this way, it is effective to photograph and project quasi-monochrome X-rays in the frequency band most suitable for the characteristics and characteristics of the subject, but this cannot be considered when using multi-color X-rays.

The third problem is that the subject is irradiated with a large amount of radiation unnecessarily. In the natural state, the amount of radiation irradiated to the human body is about 300mrem per year, which can be said to be harmless to the human body. However, exposure to too much radiation can cause fatal damage to the human body. For reference, when a typical X-ray thorax image is taken at a hospital, 20-30 mrem of radiation is irradiated at a time. When angiography by X-ray is performed, 500-2,000 mrem of radiation is irradiated at once. In the case of thoracic imaging, 300-400mrem of radiation is irradiated at a time, and in the case of CT scan, 600-1,000mrem of radiation is irradiated at a time. Therefore, frequent angiography or CT scans can be fatal to the human body. However, in the case of general X-ray imaging, the biggest reason for irradiating a large amount of radiation is because of the use of multi-color X-rays. Therefore, when the semi-monochrome X-rays are used, the amount of radiation irradiated to the human body is only about 1/10 to 1/20 of that of the conventional multi-color X-rays.

For this reason, everyone in the relevant field is well aware that it is desirable and necessary to use quasi-monochrome X-rays rather than multi-color X-rays. However, no research has yet been published that makes it possible to use quasi-monochrome X-rays in economics and efficiency. Semi-monochrome X-rays can be utilized by synchrotrons or free electron lasers, but these devices can cost billions of billions in manufacturing installations and are too bulky to require large footprint. As a result, it is not practically used in hospitals or research institutes.

On the other hand, a method for screening semi-monochrome X-rays from multicolored X-rays using a filter incorporating a conventional reflector has been proposed. The quasi-monochrome X-ray filter of the prior art, as shown in Fig. 4, is composed of a fan-shaped upper and lower surfaces, each of which is formed with a long radially long groove in each of the upper and lower surfaces, and a slide film in each groove. The reflector of the shape is fitted, and the upper and lower surfaces are integrally fastened tightly with a reflecting mirror therebetween. This prior art monochromatic X-ray filter allows the selection of a particular quasi monochromatic X-ray from a multicolor X-ray by means of internal slide film reflectors, but since its thickness is very thin, There is a problem that only a small part of the generated X-rays is used.

5 (a) and 5 (b) are conceptual views of the case of applying the quasi-monochrome X-ray filter of the prior art. As shown in these figures, the conventional monochromatic X-ray filter 8 covers only a part of the area 7 from which the multi-color X-ray beams are radiated, so that shooting with a multi-color X-ray even when photographing a subject In this case, only an extremely narrow area 10 can be photographed compared to the area 9 of the case. Therefore, in order to photograph a subject using the conventional quasi-monochrome X-ray filter, the subject must be divided into dozens or more of the subject size (if the subject is large) and photographed on the divided pieces. There is this.

The present inventors filed PCT / US2004 / 017131 (published on Feb. 3, 2005) filed with respect to a filter system capable of filtering narrow band X-rays by stacking reflectors (hereinafter referred to as “PCT17131”). He is also a co-inventor. According to Bragg's Diffraction Law (see Fig. 6), the layer thickness (d) and the incident angle (θ) of the reflector are determined so as to satisfy 2d sinθ = nλ. Only the quasi-monochrome X-rays in the wavenumber lambda band are reflected, while the thicker the layer thickness of the reflector is, the quasi-monochrome X-rays in the high frequency band are reflected (see Fig. 7). PCT17131 applies these principles, and relates to the structure of a filter by stacking a large number of reflectors to which Bragg's diffraction law can be applied.

That is, PCT17131 adjusts the layer thickness (d) of the reflector and the incident angle (θ) of the multi-color X-rays incident on the reflector, so that only quasi-monochrome X-rays of a desired frequency band can be selected. The quasi-monochrome X-ray filter was constructed using. When the filter is placed between the multicolor X-ray light source and the subject, and the X-ray detector is placed behind the subject, the quasi-monochrome X-rays selected by the reflector irradiate the subject to form an image on a detector installed behind the subject. Let's go.

However, in the quasi-monochrome X-ray filter of the invention of PCT17131, the band of the quasi-monochrome X-ray reflected by the reflector is excessively widened beyond the required frequency band, and the reflected quasi-monochrome X-ray is uniformly applied to the detector. There is a problem that it is not investigated. If the band of quasi-monochrome X-rays reflected by the reflector becomes wider than necessary, noise may be caused by X-rays of unnecessary frequency, and if the subject is not irradiated with quasi-monochrome X-rays uniformly, Since the number of photons of the touching X-rays is different, no clear image is formed on the detector.

In the invention of PCT17131, the reflector reflecting the quasi-monochrome X-rays is formed so that the coating surface is horizontal as shown in Fig. 8, so that the (multicolor) X- irradiated radially from the X-ray source 102. The angle at which the line beam 104 is incident and reflected in relation to the reflector varies with position. That is, since X-rays are generated by a very small light source with a single point, they spread radially, which causes the angle (θ) at which the X-ray is incident (reflected) to the reflector near the light source and the middle of the reflector. The angle θ1 at which the X-rays are incident (reflected) on the site and the angle θ2 at which the X-rays are incident (reflected) at the reflector farther from the light source are different. For this reason, according to the reflector used in PCT17131, since the X-rays of a fairly wide frequency band are reflected from the angle θ to the angle θ2, X-rays of a wider band than the actual required frequency bands are reflected. Noise is generated by X-rays of unnecessary frequencies.

On the other hand, the quasi-monochrome X-rays reflected by each reflector of the quasi-monochrome X-ray filter have a different number of photons depending on the positions of the reflections, and the quasi-monochrome X-rays do not need to have the same number of photons. When irradiated on the subject, X-rays of uniform photon count cannot be irradiated on the subject, and as a result, a clear image cannot be formed on the detector. However, PCT17131 does not provide a solution for such a problem.

An object of the present invention is to select specific quasi-monochrome X-rays in a narrower band from multi-color X-rays and to irradiate the subject, thereby enabling more accurate measurement and further minimizing the amount of radiation received by the subject. To reduce. And another object of the present invention is to be able to uniformly irradiate quasi-monochrome X-rays to the subject.

Hereinafter, the configuration of the present invention.

9 is a schematic diagram of a quasi-monochrome X-ray imaging apparatus 100 to which the present invention is applied. The quasi-monochrome X-ray imaging apparatus 100 includes a (multicolor) X-ray source 102, a multi-color X-ray beam 104, a quasi-monochrome X-ray filter 106, a position adjusting mechanism 108, a quasi-color The monochromatic X-ray beam 110, the angular velocity rotating device 112, the shutter device 114 and the X-ray detector 116. The X-ray generator 102 emits X-rays generated by the X-ray generator, and the shutter device 114 is connected to be controlled by the shutter controller 126, and the angular velocity rotation The device 112 and the shutter device 114 are configured to operate in conjunction with each other.

In the above configurations of the present invention, the X-ray source 102, the detector 116, the uniform angular velocity rotating device 112, and the precision shutter device 114 are techniques that are currently used in the art or may be improved in the future. Applicable As an example, the X-ray generator 102 may be configured as an X-ray radiator of a general X-ray imaging apparatus currently widely used, and the detector 116 may be configured as a known X-ray film or digital detector. have. In the case of using a digital detector, a processor 118 may be included to collect and process data from the digital detector 116 to produce an X-ray image. Of course, the above configuration in the present invention is not limited or limited to the current technology of each technology field, it is possible to apply or apply those that are appropriate in the future development of the technology.

In the present invention, the full-color X-rays generated from the X-ray generator 102 are as wide as the optical path passing through the semi-monochrome X-ray filter 106, so that the semi-monoscopic X-ray beam 110 is Is generated. The positioning mechanism 108 moves the quasi-monochrome X-ray filter 106 relative to the X-ray source 102 within at least 1 to 3 degrees of freedom so that the filter 106 is aligned in the most appropriate position. . In the photographing apparatus 100, the position adjusting mechanism 108 is used to precisely adjust the focal length of the filter 106 on the X-ray generating source in one to three dimensions. That is, the X-ray generator 102 is fixed at a predetermined position, while the filter 106 is movable by the position adjusting mechanism 108.

The subject 120 of the X-ray radiograph is placed between the filter 106 and the detector 116 to be irradiated by the quasi-monochrome X-ray beam 110. The quasi-monochrome X-ray beam 110 that is most appropriately adjusted is selected in consideration of the characteristics or properties of the inspection target portion of the subject 120, and such quasi-monochrome X-rays are filtered to filter the quasi-monochrome X. When a ray is irradiated to the subject, X-ray shadows of various intensities are irradiated onto the detector 116, which is converted into an image of the subject 120 by the detector 116. The subject 120 may be a living creature such as a human or an animal, or may be an inanimate object such as a machine or a cargo.

Figure 10 is a plan view showing one embodiment of a reflector used in the quasi-monochrome X-ray filter of the present invention. When the distance from the X-ray light source 102 to the proximal end 206 of the reflector 200 is d1 and the distance to the remote end 208 is d2, and the X-ray divergence angle of the light source 102 is θ. The radial length of the reflector is (d2-d1), the arc length of the proximal end 206 is d1 * 2 (θ + Δ), and the arc length of the remote end 208 is d2 * 2 (θ + Δ). ) to be. In this case, Δ has a positive value which is not zero.

In one embodiment of the reflector 200 shown in Fig. 10, one side thereof is narrow and the other side thereof is a wide fan shape, and the flat shape of the reflector 200 is an edge line 201A from a wide area of a fan shape to a narrow area. This is because it is assumed that the light source 102 is placed on the upper portion of the focal point where these lines abut when extending 201B). That is, the X-rays radiated from the light source spread radially at a predetermined divergence angle θ, in order to cover the irradiated X-rays most economically and efficiently in consideration of the advantages. As such, the preferred flat shape of the reflector used in the semi-monochrome X-ray filter of the present invention may be called a fan shape, but is not necessarily limited to the fan shape.

FIG. 11 is a longitudinal cross-sectional view of the reflector of FIG. 10 taken along line A-B. FIG. 11 shows five first layers 302 and five second layers 304 formed on a substrate 202, where the first layer 302 and the second layer 304 are one. The coating layer 306 is formed. That is, the reflector 200 used in the quasi-monochrome X-ray filter of the present invention is composed of a laminate of a substrate having a smooth surface and at least one coating layer, and each coating layer is formed of X-rays of a predetermined frequency band. A first layer 302 made of Z heavy metal for reflection and a second layer 304 made of a material that is transparent to a predetermined X-ray frequency. The number of coating layers constituting the reflector may be two layers (most basically). However, considering the type of heavy metal and metal forming the coating layer or the use of a filter composed of the reflectors, hundreds of coating layers may be formed as necessary. It may be. As the material of the substrate, any surface can be used as long as it is a smooth material. Preferably, one of glass, silicon, and aluminum foil having a surface roughness of 10 GPa or less is used.

It is preferable to use one of gold, platinum, and iridium as the Z heavy metal of the first layer, and one of carbon or silicon as the X-ray transparent material of the second layer.

Since the full color X-ray beam 104 emitted from the X-ray light source 102 will be incident on the surface 210 of the reflector at a predetermined angle [theta], the thickness of each coating layer 306 will be determined by To satisfy the diffraction equation of Bragg).

2d * sinθ = nλ (1)

In the above formula,

θ is the angle between the surface of the coating layer and the incident light 104,

D is the thickness of the coating layer 306,

n is an integer, and

λ is the wavelength of the frequency of the reflected X-ray beam 110.

One of the energy equations for energy and frequency is

E = ħω = ħ (2π / f) (2)

here,

E is energy,

ħ is Planck's constant,

ω is the angular frequency; And

f is frequency.

Bragg diffraction (1) can be rewritten as follows.

2d * sinθ = nλ = nc / f (3)

Where c is the luminous flux.

When the diffraction equation of the Brack is satisfied, the beam 110 reflected by the reflector 200 has the same frequency, thereby forming a quasi-monochrome X-ray beam.

FIG. 12 is a cross-sectional view 400 of a reflector 200 cut along the CD line of FIG. 10, with five first layers 302 and five second layers 304 coated on top of the substrate 202 in turn. It shows what is done. As described above, the first layer 302 and the second layer 304 form one coating layer 306. The multicolored X-ray beam 104 emitted from the X-ray source 102 enters the proximal end of the reflector 200 at an angle of θ1 and enters the remote end of the reflector 200 at an angle of θ2. In the present invention, the thickness of each coating layer 306 is gradually thickened in the transverse direction so that the frequency of the beams reflected from the reflector satisfies the diffraction equation (1) of the Brac. That is, in order to make λ constant for various incidence angles θ of the full-color X-rays, the thickness d of the coating layer 306 was gradually changed based on the diffraction equation 10 of the Brac, and thus the coating layer ( The reflected light reflected by 306 has the same frequency and thus forms one quasi-monochrome X-ray beam.

Fig. 13 is a cross sectional view of the quasi-monochrome X-ray filter 106 of the present invention, showing by way of example that the filter 106 consists of five reflectors 200. The number of reflectors 200 used in the filter 106 of the present invention can be appropriately adjusted in consideration of the size of the subject to be photographed and also in consideration of the intended use, and composed of 2 to 1,000 or more reflectors as necessary. May be Each reflector 200 constituting the filter 106 is located at a distance d1 from the source 102, forms an angle of the proximal end 206 with θ1, and forms an angle of θ2 with the remote end 208. Reflectors stacked on the filter housing interfere with neighboring reflectors with X-rays incident to the near end (adjacent to the direction in which the X-rays are incident) and X-rays incident and reflected at the remote end (opposite to the near end) It shall be inclined at a predetermined angle with respect to each other to have an angle that does not. And when the angle between two adjacent reflecting mirrors 200 is Φ, it is preferable that the angle Φ between each reflecting mirror 402 is constant for all the reflecting mirrors.

In constructing the quasi-monochrome X-ray filter of the present invention, each reflector 200 should be arranged and mounted in the same housing. Preferably, as shown in FIG. 14, a plurality of grooved slots are provided in the housing 500. 502 may be formed such that the reflectors 200 fit into the slot 502. In the housing, the side on which the X-rays are incident and the side on which the reflection is made open, and the portion in which the grooved slot is formed is naturally closed. The specific shape of the housing or the method of mounting the reflector 200 inside the housing may be variously changed by the related art.

Since the filter 106 of the present invention must be configured to be movable in three orthogonal directions and roll and yaw angles, in this respect, the present invention is directed to three orthogonal directions and / or to the filter 106. Or it is preferable to be configured to be combined with the angular speed rotation device 112 and the shutter device 114 for moving to the roll and yaw angle.

The reason for combining the filter 106 with the angular velocity rotating device 112 and the shutter device 114 is to make the number of all photons reaching a given point substantially the same. One embodiment of this configuration of the present invention is provided with a uniform angular velocity rotating mechanism and a shutter device to allow the filter of the present invention to rotate at a constant angular velocity around the X-ray focal point at an angle of Φ which is an angle between two adjacent reflectors At this time, the X-ray source emits a uniform X-ray beam. This filter rotating mechanism 112 should give a uniform angular velocity without generating substantial vibration during rotation. In addition, the shutter 114 to be opened for a predetermined period should be provided, the opening and closing mechanism of the shutter is substantially no vibration, it is preferable to have a time precision of about 1/1000 seconds or more. The filter rotating mechanism 112 configured as described above allows the X-rays to be irradiated so as to substantially uniform the total integrated intensity of the X-rays irradiated to each point of the subject.

As such, the filter 106 of the present invention operates in conjunction with the multi-color X-ray generator 102, the shutter device 114, and the angular velocity rotating device 112, so that the shutter of the filter 106 connected to the X-ray generator is By rotating at a constant angular velocity around the X-ray focus for an extremely short time that is open, the desired substantially uniform illumination is made on the subject. Since the shutter device 114 and the angular velocity rotating device 112 may be manufactured by applying and applying a technology widely used in the related art, such as a camera, it is possible to develop a special technology for application only to the present invention. I don't need it.

As described above, the semi-monochrome X-ray filter of the present invention and the X-ray imaging apparatus using the same include a multi-color X-ray source 102 and a plurality of coating layers alternately coated with two materials on a flat substrate. A plurality of substantially identical reflectors 106, a filter 106 by mounting a plurality of quasi-monochrome X-ray reflectors 106 inside the housing 500, and the filter 106 positioned relative to the X-ray source. It consists of a configuration including a position adjusting mechanism 108 for adjusting the, the shutter device 114 for controlling the exposure time and the angular speed rotating device 112 for rotating the filter at a constant angular speed.

The above has described some embodiments to which the present invention is applied, and the present invention is not limited to these embodiments. Since the present invention can be changed, modified, and added by those skilled in the art, the present invention is not limited to the above description and includes parts that can be easily changed and modified by those skilled in the relevant art. Should be interpreted as.

According to the present invention, it is possible to provide a uniform irradiation semi-monochrome X-ray imaging apparatus and a manufacturing method thereof at low cost.

Claims (12)

A plurality of coating layers comprising a first layer of Z heavy metal material for reflecting X-rays of a predetermined frequency and a second layer of material that transmits X-rays of a predetermined frequency are formed on the substrate having a smooth surface. Consisting of reflectors, the coating layer being gradually thicker in the direction away from the X-ray source when placed relative to the X-ray source such that the X-ray beams reflected from the reflector satisfy Bragg's diffraction equation (1). In the quasi-monochrome X-ray filter which is formed to be thick and is mounted by stacking the same plurality of reflectors in the housing, Each of the reflectors is a semi-monochrome X-ray filter, characterized in that the fan-shaped shape is formed in the same center of curvature of the near end and the remote end. 2d sinθ = nλ ----- (1) The method of claim 1, wherein the material of the substrate is one of glass, silicon, aluminum foil, Z heavy metal of the first layer is any one of gold, platinum, iridium, X-ray of a predetermined frequency of the second layer The quasi-monochrome X-ray filter, characterized in that the material passing through is one of carbon or silicon. 3. The reflector according to claim 1 or 2, wherein the reflectors stacked on the filter housing are incident on a remote end (opposite to the proximal end) and the X-ray incident on a proximal end (adjacent to the direction in which the X-ray is incident). When the reflected X-rays are inclined at a predetermined angle with respect to each other so as to have an angle that does not interfere with neighboring reflectors, and the angle between the two reflecting mirrors 200 adjacent to each other is Φ, between the reflecting mirrors 402 A semi-monochrome X-ray filter, characterized in that the angle Φ is constant for all reflectors. delete The quasi-monochrome X-ray filter according to claim 1 or 2, wherein a plurality of groove-shaped slots are formed in both sides of the filter housing so that the reflector is fitted in the slots. An X-ray imaging apparatus configured to transmit X-rays generated from an X-ray generating source to an object to be photographed and to detect X-rays passing through the object with an X-ray detector, An x-ray imaging apparatus using a quasi-monochrome X-ray filter, characterized in that the quasi-monochrome X-ray filter of claim 1 is included so as to select from the multi-color X-rays to a quasi-monochrome X-ray. The material of the substrate constituting each reflector is one of glass, silicon, and aluminum foil, and the Z heavy metal of the first layer is any one of gold, platinum, and iridium. X-ray imaging apparatus using a quasi-monochrome X-ray filter, characterized in that the material that transmits the X-ray of the frequency is one of carbon or silicon.  8. The reflector according to claim 6 or 7, wherein the reflectors stacked on the filter housing are incident on a remote end (opposite to the proximal end) and an X-ray incident on a proximal end (adjacent to the direction in which the X-ray is incident). When the reflected X-rays are inclined at a predetermined angle with respect to each other so as to have an angle that does not interfere with neighboring reflectors, and the angle between the two reflecting mirrors 200 adjacent to each other is Φ, between the reflecting mirrors 402 X-ray imaging apparatus using a semi-monochrome X-ray filter, characterized in that the angle Φ is constant for all the reflecting mirrors. delete 8. The X-ray photographing apparatus of claim 6 or 7, wherein the filter housing has a plurality of groove-shaped slots formed at both sides thereof to allow the reflector to be fitted into the slot. . 8. The quasi-monochrome X-ray filter of claim 6 or 7, wherein the quasi-monochrome X-ray filter is configured to be movable in three orthogonal directions, roll angles, and yaw angles. X-ray imaging apparatus using a quasi-monochrome X-ray filter, characterized in that the position adjustment mechanism that can be moved. 8. The angular velocity rotating device and the quasi-monochrome filter according to claim 6 or 7, wherein the quasi-monochrome filter is rotated at a constant angular velocity for a predetermined time with respect to the X-ray source. X-ray imaging apparatus using a quasi-monochrome X-ray filter, characterized in that the shutter device is included to enable the radiation to operate in conjunction with each other.

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