hereinafter , preferred embodiments of the present invention are described in detail with reference to the accompanying drawings . fig2 is a front view of an x - ray imaging apparatus according to the present invention . referring to fig2 , the x - ray image obtaining apparatus 100 according to the present invention includes a support row 111 of a vertical pillar shape and a device body 110 installed in such a way as to move up and down along the support row 111 . a generator or x - ray generation unit 120 for radiating x - ray toward a specimen br is installed on the upper side of the device body 110 . a detector 130 which faces the x - ray generation unit 120 and receives the x - rays radiated by the x - ray generation unit 120 is installed on the bottom of the device body 110 . fig3 is a front view of the x - ray generation unit shown in fig2 . in accordance with the first embodiment of the present invention shown in fig3 , when viewed from the front of the x - ray generation unit 120 , that is , in a testee direction , the x - ray generation unit 120 includes a plurality of x - ray sources 123 and 124 which has different distances from the specimen and is arranged to form at least two rows and a mounting unit 122 for detachably installing the plurality of x - ray sources 123 and 124 on the x - ray generation unit 120 . in this case , it is preferred that each of the rows of the x - ray sources 123 and 124 forms an arc shape for the specimen br , but is not limited thereto . each of the rows may form a straight - line shape . furthermore , each of the x - ray sources 123 and 124 may be configured to include x - ray sources of an electric field emission method using a nanostructure material electric field emission emitter , such as a carbon nanotube . if each of the rows of the x - ray sources 123 and 124 forms an arc shape , as shown in fig3 , when viewed from the front of the x - ray generation unit 120 , a plurality of x - ray sources 123 - 1 , 123 - 2 , . . . , 123 - n , 124 - 1 , 124 - 2 , 124 - n is crisscross arranged in zigzags with respect to the specimen br in two rows having different distances from the specimen . specifically , when viewed from the front of the x - ray source generation unit 120 , assuming that the number of x - ray sources 123 and 124 is 2n , for convenience sake , the 2n x - ray sources 123 and 124 forms two rows each including the n x - ray sources . in this case , the n x - ray sources 123 - 1 , 123 - 2 , . . . , 123 - n are arranged in a first row along an arc placed at a first distance r 1 from the specimen br . the remaining n x - ray sources 124 - 1 , 124 - 2 , . . . , 124 - n are arranged in a second row along an arc placed at a second distance r 2 from the specimen br , which is greater than the first distance r 1 . in this case , it is preferred that the x - ray sources 123 of the first row are spaced apart from each other to the extent that they do not interfere with or hinder x - rays radiated by the x - ray sources 124 of the second row . accordingly , the n x - ray sources 123 - 1 , 123 - 2 , . . . , 123 - n forming the first row and the remaining n x - ray sources 124 - 1 , 124 - 2 , . . . , 124 - n forming the second row are spaced apart from each other at a specific angular interval δθ . accordingly , all the x - ray sources 123 and 124 may radiate x - rays to the specimen br at different angles . fig4 ( a ) and 4 ( b ) are a front view and plan view of the x - ray generation unit shown in fig2 . in accordance with the second embodiment of the present invention shown in fig4 , when viewed from the top of the x - ray generation unit 120 , the x - ray generation unit 120 includes a plurality of x - ray sources 125 and 126 arranged to form at least two rows and a mounting unit 122 for detachably installing the plurality of x - ray sources 125 and 126 on the x - ray generation unit 120 . as shown in fig4 ( a ) , it is preferred that the x - ray sources 125 and 126 form the same arc shape back and forth when viewed from the front of the x - ray generation unit 120 , but is not limited thereto . the x - ray sources 125 and 126 may form a straight line form . as shown in fig4 ( b ) , when viewed from the top of the x - ray generation unit 120 , x - ray sources 125 - 1 , 125 - 2 , . . . , 125 - n and 126 - 1 , 126 - 2 , . . . , 126 - n are crisscross arranged in zigzags back and forth with respect to the specimen br in at least two rows . specifically , assuming that the number of x - ray sources 125 and 126 is 2n , the two n x - ray sources 125 and 126 form two rows each including the n x - ray sources , the n x - ray sources 125 - 1 , 125 - 2 , . . . , 125 - n arranged in a first row along an arc having a specific radius r from the specimen br . the remaining n x - ray sources 126 - 1 , 126 - 2 , . . . , 126 - n are arranged in a second row along an arc having the same radius r from the specimen br . the first row is spaced apart from the second row at a specific interval i in the direction from the x - ray generation unit 120 to the device body 110 , when viewed from the top of the x - ray generation unit 120 . furthermore , the n x - ray sources 125 - 1 , 125 - 2 , . . . , 125 - n forming the first row and the remaining n x - ray sources 126 - 1 , 126 - 2 , . . . , 126 - n forming the second row are spaced apart from each other at a specific angular interval a with respect to the specimen br . accordingly , all the x - ray sources 125 and 126 may radiate x - rays to the specimen br at different angles . fig5 ( a ) and 5 ( b ) are a front view and plan view of the x - ray generation unit shown in fig2 . in accordance with the third embodiment of the present invention shown in fig5 , the x - ray generation unit 120 includes a plurality of x - ray sources 127 and 128 arranged to at least two rows and a mounting unit 122 for detachably installing the x - ray sources 127 and 128 on the x - ray generation unit 120 . when viewed from the front of the x - ray generation unit 120 , a plurality of x - ray sources 127 - 1 , 127 - 2 , . . . , 127 - n and 128 - 1 , 128 - 2 , . . . , 128 - n is crisscross arranged in zigzags in at least two rows having different distances from the specimen br , as shown in fig5 ( a ) . even when viewed from the top of the x - ray generation unit 120 , the plurality of x - ray sources 127 - 1 , 127 - 2 , . . . , 127 - n and 128 - 1 , 128 - 2 , . . . , 128 - n is crisscross arranged in zigzags in the at least two rows back and forth with respect to the specimen br , as shown in fig5 ( b ) . specifically , assuming that the number of x - ray sources 127 and 128 is 2n , the two n x - ray sources 127 and 128 form two rows each including the n x - ray sources , when viewed from the front of the x - ray generation unit 120 . the n x - ray sources 127 - 1 , 127 - 2 , . . . , 127 - n are arranged in a first row along an arc placed in a first distance r 1 from the specimen br . the remaining n x - ray sources 128 - 1 , 128 - 2 , . . . , 128 - n are arranged in a second row along an arc placed at a second distance r 2 from the specimen br , which is greater than the first distance r 1 . at the same time , even when viewed from the top of the x - ray generation unit 120 , the second row is spaced apart from the first row at a specific interval i in the direction from the x - ray generation unit 120 to the device body 110 . in accordance with the array structure of the x - ray sources 127 and 128 according to the third embodiment , x - rays radiated by the x - ray sources 128 - 1 , 128 - 2 , . . . , 128 - n of the second row reach the specimen br without interference or hindrance from the x - ray sources 127 - 1 , 127 - 2 , . . . , 127 - n of the first row because the second row is spaced apart from the first row at the specific interval i when viewed from the top of the x - ray generation unit 120 . accordingly , the plurality of x - ray sources 127 and 128 can be more densely arranged within the x - ray source generation unit 120 because an angular interval a8 between the x - ray sources 127 and 128 can be reduced to the fullest . as a result , a sharp high - resolution three - dimensional synthesis image can be obtained . fig6 ( a ) and 6 ( b ) are a front view and plan view of the x - ray generation unit shown in fig2 . the fourth embodiment shown in fig6 is a modified example of the first embodiment , and differences between the fourth embodiment and the first embodiment are chiefly described . the x - ray image obtaining apparatus 100 further includes moving means m for moving the x - ray sources 123 - 1 , 123 - 2 , . . . , 123 - n of at least one of a first row and a second row so that the x - ray sources 123 - 1 , 123 - 2 , . . . , 123 - n of the first row are spaced apart from the x - ray sources 124 - 1 , 124 - 2 , . . . , 124 - n of the second row at a specific interval i , when viewed from the top of the x - ray source generation unit 120 . in this case , it is preferred that the moving means m is a linear motor capable of moving the x - ray sources 123 of at least one of the first row and the second row , but may include a rotary motor . various methods may be applied to the x - ray generation unit 120 according to the fourth embodiment depending on purposes . however , for example , in the state in which the first row and the second row have overlapped up and down when viewed from the top of the x - ray source generation unit 120 , a first driving method in which the x - ray sources of the first and the second rows sequentially radiate x - rays alternately or the x - ray sources of the first or the second row first sequentially radiate x - rays and the x - ray sources of the other row then sequentially radiate x - rays is possible . in this case , interference or hindrance may be present between the x - ray sources of the first and the second rows depending on the number of x - ray sources , etc . for another example , in the state in which the first row and the second row have overlapped up and down when viewed from the top of the x - ray source generation unit 120 , a second driving method in which the x - ray sources 123 - 1 , 123 - 2 , . . . , 123 - n of the first row first sequentially radiate x - rays toward the specimen br , the x - ray sources 123 - 1 , 123 - 2 , . . . , 123 - n of the first row are moved to a location spaced apart from the x - ray sources 124 - 1 , 124 - 2 , . . . , 124 - n of the second row at a specific interval i , the x - ray sources 124 - 1 , 124 - 2 , . . . , 124 - n of the second row sequentially radiate x - rays toward the specimen br , and the x - ray sources 123 - 1 , 123 - 2 , . . . , 123 - n of the first row are then returned to the original location is possible . in accordance with the second driving method of the fourth embodiment , as in the third embodiment , the x - ray sources 123 belonging to the first row are spaced apart from the second row at the specific interval i when viewed from the top of the x - ray generation unit 120 and are moved . accordingly , x - rays radiated by the x - ray sources 124 - 1 , 124 - 2 , . . . , 124 - n forming the second row reach the specimen br without interference or hindrance from the x - ray sources 127 - 1 , 127 - 2 , . . . , 127 - n forming the first row . accordingly , the x - ray sources 123 and 124 can be arranged more densely within the x - ray source generation unit 120 because an angular interval a between the x - ray sources 123 and 124 can be reduced to the fullest . furthermore , unlike in the third embodiment , in the fourth embodiment , when three - dimensional stereoscopic images are synthesized , it is not necessary to correct a difference between images attributable to the interval i between the first row and the second row . accordingly , a sharper high - resolution three - dimensional synthesis image can be obtained . in the preferred embodiments described so far , the plurality of x - ray sources has been illustrated as being arranged in 2 rows , but is not limited thereto . the plurality of x - ray sources may be arranged in 3 rows or 4 rows or more rows . although a specific x - ray source malfunctions , a high - resolution three - dimensional synthesis image can be obtained without a problem by performing photographing using only the x - ray sources of other rows other than a corresponding row or by replacing the fail specific x - ray source with an adjacent another x - ray source of an adjacent another row , performing photographing , and then correcting an image . the x - ray generation unit 120 may be detachably installed on the device body 110 , the mounting unit 122 may be detachably installed on the x - ray generation unit 120 , and the x - ray sources may be detachably installed on the mounting unit 122 . accordingly , a user can selectively install the mounting unit , having various patterns ( e . g ., the interval between the x - ray sources and the distribution , array , etc . of the x - ray sources ), on the x - ray generation unit 120 according to a photographing purpose in response to required resolution and / or a different type of specimen , and can also easily replace and repair an x - ray source when it fails . tomosynthesis photographing using the x - ray image obtaining apparatus 100 according to the first to the fourth embodiments of the present invention is described below . first , when a testee in a stand - up or standing state is in - situ placed at the photographing location of the x - ray image obtaining apparatus 100 , the device body 110 moves up and down along the row 111 , and thus the device body 110 is positioned so that the specimen br is placed on the detector 130 . in this case , in order to prevent an abnormal portion within the specimen br from being covered by a mammary gland tissue , etc ., it is preferred that the specimen br placed on the detector 130 is pressurized by a compression pad ( not shown ). next , the plurality of x - ray sources sequentially operates for each row or sequentially operates while changing their rows and radiates x - rays to the specimen br at different angles . the radiated x - rays pass through the specimen br and are received by the detector 130 . the detector 130 generates an electrical signal for each location , which is proportional to the amount of the received incident x - rays , reads the electrical signals and location information , and obtains x - ray images of the specimen br obtained at the respective angles by processing the read electrical signals and location information using an image processing algorithm . thereafter , a high - resolution three - dimensional synthesis image can be obtained by synthesizing the x - ray images of the specimen br obtained at the different angles using a tomosynthesis method well known to those skilled in the art to which the present invention pertains . the x - ray image obtaining apparatus according to the present invention can obtain a high - resolution three - dimensional tomosynthesis image and thus perform an accurate lesion diagnosis because x - ray photographing is rapidly performed on a specimen at various angles through the plurality of x - ray sources arranged according to a specific rule . furthermore , reliability of a product is improved because a high - resolution three - dimensional tomosynthesis image can be obtained although some of the plurality of x - ray sources malfunction . furthermore , the x - ray image obtaining apparatus according to the present invention does not generate any vibration and noise because it does not need to have additional movable parts for rotation driving . an example in which the x - ray image obtaining apparatus according to the present invention has been used as a mammography apparatus , that is , an x - ray apparatus for photographing the breast , has been described above , but the scope of the present invention is not limited to a device used for such a purpose . that is , the x - ray image obtaining apparatus of the present invention can be applied to all types of x - ray photographing apparatuses for obtaining projection images of a specimen using x - rays . those skilled in the art to which the present invention pertains may easily understand that the technical scope of the present invention covers an x - ray photographing apparatus of such a type . furthermore , the x - ray image obtaining apparatus of the present invention should be construed as covering all modifications or variations derived from the meaning and scope of the appended claims and their equivalents .
the present invention relates to an x - ray imaging device including a plurality of x - ray sources . the x - ray image photographing device , according to the present invention , is an x - ray imaging device comprising an x - ray generation unit and a detector having an object being inspected placed therebetween and are arranged to face each other , wherein the x - ray generation unit includes the plurality of x - ray sources which are arranged along at least two rows located at different distances from the object being inspected and respectively irradiate x - rays toward the object being inspected .