hereinafter , preferred embodiments of the present invention to achieve the above - described objects will be described with reference to the accompanying drawings . in the following description of the embodiments , the same terms or characters will be used to refer to the same elements , and additional or redundant explanations thereon will be omitted below . first , one embodiment of an x - ray imaging apparatus according to the present invention , i . e ., an x - ray imaging apparatus having a three - dimensional scanner will be described with reference to fig2 to 4 . among the accompanying drawings , fig2 is a perspective view showing one embodiment of an x - ray imaging apparatus according to the present invention , fig3 is a perspective view showing one embodiment of a scanner of an x - ray imaging apparatus according to the present invention , and fig4 is a side view showing a coupler of the scanner shown in fig3 . referring to fig2 to 4 , one embodiment of an x - ray imaging apparatus according to the present invention comprises an x - ray imager 100 and a scanner ( 3d scanner ) 200 mounted to the x - ray imager . the x - ray imager 100 comprises an x - ray beam generator 110 , an x - ray beam detector 120 and a body unit 130 , wherein the x - ray beam detector 120 is installed opposite to the x - ray beam generator 110 . the x - ray beam generator 110 comprises an x - ray beam source for emitting an x - ray beam to take an x - ray image . further , the x - ray beam detector 120 detects the x - ray beam to obtain an x - ray image , and more specifically detects the x - ray beam transmitted through an object to obtain an internal body image . detailed principles and configurations of the x - ray beam generator 110 and x - ray beam detector 120 are known in the relevant art , and additional explanations thereon will be omitted . further , the body unit 130 comprises a base body 131 to support the weights of the x - ray beam generator 110 and x - ray beam detector 120 , and a support body 132 . here , the x - ray beam generator 110 and x - ray beam detector 120 are installed to the support body 132 . the support body 132 comprises a support arm arranged on the base body 131 so that it is supported by the base body 131 . in the present embodiment , the base body 131 is in the form of a vertically elongated column , but the form is not limited thereto . more specifically , the x - ray beam generator 110 is arranged at one end of the support body 132 , i . e ., the support arm , and the x - ray beam detector 120 is mounted to the other end of the support arm to face the x - ray beam generator 110 . accordingly , in this embodiment , the support arm 132 , x - ray beam generator 110 and x - ray beam detector 120 together constitute an inverted u - shape . further , an alignment unit 130 a is preferably arranged on the body unit 130 to place a man or woman &# 39 ; s face in the proper position to obtain an x - ray image of an object , e . g ., a head of a patient . when the jaw of the patient is placed on the alignment unit 130 a , the head of the patient is aligned between the x - ray beam generator 110 and x - ray beam detector 120 . the support body 132 , i . e ., the support arm may be configured to rotate so that the x - ray beam generator 110 and x - ray beam detector 120 may circle around the object according to the rotation of the support body 132 and take an x - ray image of the object . a drive box 131 a ( not shown ) is arranged at the upper part of the base body to rotate the support body 132 . the support body 132 is rotated by means of a rotation device such as a motor , gear and belt arranged within the drive box 131 a . accordingly , when a face is placed between the x - ray beam generator 110 and x - ray beam detector 120 and then the support body 132 constituting an inverted u - shape together with the x - ray beam generator 110 and x - ray beam detector 120 is rotated by means of the rotation device , the x - ray beam generator 110 and x - ray beam detector 120 circle around the object facing each other and take an x - ray image of the object . examples of the x - ray imager include various types of apparatuses such as a dental ct apparatus , cephalo imaging apparatus and panoramic imaging apparatus , which use radioactive rays or x - rays to obtain internal body images . next , the scanner 200 is configured to obtain an . exterior image of an object . the scanner is arranged on the x - ray imager 100 and may be removably mounted to the x - ray imager 100 . the scanner 200 may be arranged on the x - ray beam generator 110 or the x - ray beam detector 120 . the scanner 200 may also be arranged on the body unit 130 , and more specifically on the support body 132 , i . e ., the support arm . of course , the scanner 200 may also be arranged on the base body 131 . although not shown in the drawings , it may be rotatably arranged on the base body . fig2 shows that the scanner 200 is mounted to the support body 132 , while it may be removably mounted to the support body as described above . one example of the element to removably mount the scanner 200 is a bolt . for example , a bolt is arranged as a rotating member in one of the scanner 200 and support body 132 , and a hole for coupling of the bolt is arranged in the other one . this configuration may be diversely changed as long as the scanner may be removably attached to the support body 132 . further , the scanner 200 may be applied as a three - dimensional ( 3d ) scanner to obtain a three - dimensional image . accordingly , an exterior image ( e . g ., a face image ) of a patient may be obtained in three dimensions . when the x - ray imager 100 takes an x - ray image , the scanner 200 may obtain an exterior image of an object at the same time . otherwise , the x - ray imaging and exterior scanning may be sequentially performed . that is , according to the present invention , a face image and a cephalic x - ray image of a patient may be simultaneously obtained while the patient remains in one posture . referring to fig3 and 4 , one embodiment of the scanner 200 a is configured to removably attach to the x - ray imager , and comprises a scanner body 210 and a coupler 220 . an imaging device ( not shown ) is arranged within the scanner body 210 to obtain an exterior image of the object . the coupler 220 is configured to fix the scanner body 210 to the x - ray imager 100 . the components such as the above imaging device and the like to obtain an exterior of an object are arranged in the scanner body 210 . detailed configurations and principles of the scanner to obtain images are generally known in the relevant art , and additional explanations thereon will be omitted . the coupler 220 may be removably coupled to at least one of the x - ray imager 100 and scanner body 210 . in the scanner 200 a according to the present embodiment , one end of the coupler 220 is fixed to the scanner body 210 and the other end is removably coupled to the x - ray imager 100 . to this end , the coupler 220 comprises a chuck 221 and a coupler body 222 , wherein the space of the chuck 221 may be adjusted to engage with a specific location of the x - ray imager , e . g ., the x - ray beam generator 110 . one end of the coupler body 222 is fixed to the scanner body , and the chuck 221 is arranged at the other end of the coupler body 222 . one example of the element to adjust the space of the chuck 221 is a screw adjuster 223 , which may adjust the space as a screw rotates to move forward or backward in its axial direction . accordingly , when the space of the chuck 221 widens to put the x - ray beam generator 110 inside the chuck 221 and then narrows , the chuck 221 engages with the x - ray beam generator 110 so that the scanner body 210 is removably fixed to the x - ray beam generator 110 . the scanner may be compatibly mounted to various forms of x - ray imagers . the scanner 200 a may circle around an object according to the rotation of the support body 132 and obtain images of the object in various angles . of course , the coupler 220 should be mounted at the location that does not interfere with the x - ray beam emitted from the x - ray beam generator 110 . the coupler 220 may also be coupled to the x - ray beam detector or another different location such as the support body 132 . the configuration of the coupler 220 may be diversely changed according to the location where the scanner 200 a is mounted . further , the scanner body 210 may be rotatably coupled to the coupler 220 . fig5 is a block diagram showing one example of an image processing system based on an x - ray imaging apparatus according to the present invention . the image processing system may comprise an image acquisition apparatus , i . e ., an x - ray imaging apparatus having the above - described x - ray imager and scanner , as well as an image processing module to obtain the x - ray images and exterior images , a storage module to store the images , a display module to output the x - ray images and exterior images on a screen , and a control module . fig6 is a picture showing a face image obtained by the scanner of the x - ray imaging apparatus , and fig7 is a picture showing one example of a superimposition image in which an exterior image of an object ( i . e ., a face image ) is superimposed with an x - ray image . hereinafter , other embodiments of an x - ray imaging apparatus according to the present invention will be described with reference to fig8 and 9 . referring to fig8 , in another embodiment of an x - ray imaging apparatus according to the present invention , a scanner 200 b is replaceably mounted at the location where an x - ray beam detector 120 a is mounted . the x - ray beam detector 120 a is removably mounted to the support arm 132 so that it may be detached from the support arm 132 and the scanner 200 b may be mounted taking the place of the x - ray beam detector 120 a . the mounting configurations of the x - ray beam generator 120 a and scanner 200 b may employ the same elements , e . g ., a variety of known coupling elements such as hooks and screws . next , referring to fig9 , in yet another embodiment of an x - ray imaging apparatus according to the present invention , a scanner 200 c is supported by the support arm 132 . more specifically , the scanner 200 c is mounted to a scanner arm 133 arranged on the support arm 132 so that it may be coupled to the support arm 132 via the scanner arm 133 . in the present embodiment , the scanner arm 133 is formed in a generally right - angled shape , and may be removably mounted to the support arm 132 . the scanner 200 c may be removably coupled to the scanner arm 133 . the scanner arm 133 may also be directly arranged on the base body . while the preferred embodiments of the present invention have been described as above , it will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or scope of the invention . therefore , the above - described embodiments should be regarded as illustrative rather than restrictive , and thus the present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents .