the present invention will now be described more fully with reference to the accompanying drawings , in which exemplary embodiments of the invention are shown . the invention may , however , be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein ; rather , these embodiments are provided so that this disclosure will be thorough and complete , and will fully convey the concept of the invention to those skilled in the art . like reference numerals in the drawings denote like elements , and thus their description will be omitted . a patient position monitoring apparatus according to an embodiment of the present invention will now be explained with reference to fig1 , 2 and 3 . fig1 illustrates the patient position monitoring apparatus 100 according to an embodiment of the present invention , fig2 is a block diagram of ultrasonic therapy equipment including the patient position monitoring apparatus according to an embodiment of the present invention , and fig3 is a cross - sectional view of a strap and a guide marker of the patient position monitoring apparatus according to the present invention . the patient position monitoring apparatus 100 monitors the position of a patient 70 and outputs a warning signal if the position of the patient 70 is changed during medical treatment . the patient position monitoring apparatus 100 according to the current embodiment of the invention includes a position guider 10 , a plurality of guide markers 20 and a strap 30 . the patient position monitoring apparatus 100 may further include output units . here , the output units include a display 40 and a voice output unit 50 . the output units may further include a lamp which outputs a warning signal as flicking light . the display 40 displays a menu of various functions executed in the patient position monitoring apparatus 100 . the display 40 may indicate points to which the guide markers 20 are attached or a treatment route of the patient 70 . a liquid crystal display ( lcd ) or a touch screen may be used as the display 40 . the touch screen functions as both a display device and an input device . the voice output unit 50 outputs a voice under the control of the position guider 10 . particularly , the voice output unit 50 receives the warning signal from the position guider 10 and outputs the warning signal as a voice . the position guider 10 includes source emitting parts 12 , a first communication unit 14 and a first controller 16 . the source emitting parts 12 are located above the patient to which the plurality of guide markers 20 are attached and emit a source to the guide markers 20 . the number of source emitting parts 12 corresponds to the number of guide markers 20 . the source emitting parts 12 are formed on a source emitting plate 11 ( refer to fig4 ) and emit one of a laser , led light , ultrasonic waves , sprit light and infrared rays . for example , when the source emitting parts 12 emit laser beams 13 , the laser beams 13 arrive at the patient 70 located under the source emitting parts 12 and are indicated on the strap 30 attached to the affected part of the patient 70 . the source emitting parts 12 will be described later with reference to fig4 . the first communication unit 14 performs communication with the guide markers 20 . here , wired or wireless communication can be used . the first controller 16 corresponds to a microprocessor that controls the overall operation of the position guider 10 . the first controller 16 receives information on the sensed source from the guide markers 20 and determines whether the position of the patient 70 is changed . further , the position guider 10 illustrated in fig1 has the source emitting parts 12 formed on the side facing the patient 70 . however , the shape of the position guider 10 is not limited thereto . the position guider 10 may be fixed to a therapy table 60 or a movable supporting table . each of the guide markers 20 includes a source sensor 22 , a second communication unit 24 and a second controller 26 . the source sensor 22 senses the source emitted from the corresponding source emitting part 12 . the source sensor 22 may be placed opposite to the source emitting part 12 to stably sense the source emitted from the source emitting part 12 . the source sensor 22 is selected according to the type of the source emitted from the source emitting part 12 and includes one of a laser sensor , an led sensor , an ultrasonic sensor , a sprit light sensor and an infrared sensor . for example , when a laser is emitted from the source emitting part 12 , the laser sensor is used as the source sensor 22 . the second communication unit 24 performs communication with the position guider 10 . here , wired or wireless communication may be used . further , the second controller 26 corresponds to a microprocessor which controls the overall operation of the guide markers 20 . the second controller 26 transmits information sensed by the source sensor 22 to the position guider 10 through the second communication unit 24 . the first communication unit 14 and the second communication unit 24 are connected to each other through a wired or wireless method . the first controller 16 of the position guider 10 receives the information sensed by the source sensor 22 , determines whether the source emitted from the source emitting part 12 is out of the range of the source sensor 22 through the received information and judges that the position of the patient 70 is changed if when the source is out of the range of the source sensor 22 . when it is determined that the position of the patient 70 is changed , the first controller 16 can output a warning signal through the voice output unit 16 . further , the first controller 16 can output the warning signal through the display 40 . when the position of the patient 70 is changed and thus the warning signal is output through the voice output unit 50 or the display 40 , the user can recognize the change of the patient position and move the patient 70 to the original position such that the source irradiated from the source emitting part 12 reaches the range of the source sensor 22 . the strap 30 is used to attach the guide markers 20 to the patient 70 and is located on the affected part of the patient 70 . the strap 30 includes a first adhesive part 38 formed on one side thereof . the strap 30 may cover the body of the patient 70 including the affected part or only the affected part . the first adhesive part 38 is formed to attach the guide markers 20 to the strap 30 . a velcro tape or a metal fiber can be used as the first adhesive part 38 . each of the guide markers 20 includes a second adhesive part 28 formed on one side thereof . the second adhesive part 28 is attached to the first adhesive part 38 of the strap 30 . the second adhesive part 28 may use a velcro tape when the first adhesive part 38 is a velcro tape and use a magnet when the first adhesive part 38 is a metal fiber . the first adhesive part 38 and the second adhesive part 28 are not limited to the velcro tape , metal fiber and magnet and can use various methods which can attach the first and second adhesive parts 38 and 28 to each other . although the patient position monitoring apparatus 100 according to the current embodiment of the invention includes the display 40 and the voice output unit 50 which are separated from the position guider 10 , the present invention is not limited thereto . for example , the position guider 10 may include the display 40 or the voice output unit 50 . the source emitting parts 12 according to an embodiment of the present invention will now be explained with reference to fig4 a , 4 b , 4 c and 4 d . fig4 a , 4 b , 4 c and 4 d illustrate various shapes of the source emitting parts of the patient position monitoring apparatus of the present invention . the plurality of source emitting parts 12 are formed on the source emitting plate 11 . the source emitting parts 12 are connected to the position guider 10 through a wired or wireless method and emit a source . the source emitting parts 12 may be respectively formed at four corners of the source emitting plate 11 , as shown in fig4 a , and the interval or positions of the source emitting parts 12 may be varied , as shown in fig4 b . further , the source emitting parts 12 may be arranged in a triangular shape , as shown in fig4 c , and two source emitting parts 12 may be formed in a row , as shown in fig4 d . though fig4 a , 4 b , 4 c and 4 d show the source emitting parts 12 in four arrangement forms , the present invention is not limited thereto . furthermore , the patient position monitoring apparatus 100 may include a cover for covering one of the plurality of source emitting parts 12 to reduce the number of source emitting parts 12 . the interval of the source emitting parts 12 formed on the source emitting plate 11 can be determined in advance , and thus the first controller 16 can calculate a treatment route or a treatment area for the patient through the previously determined interval of the sources 13 corresponding to the source emitting parts 12 . moreover , the source emitting parts 12 may be designed such that the source emitting parts 12 can move on the source emitting plate 11 . in addition , the source emitting parts 12 may be connected to a flexible rail without using the source emitting plate 11 to change the positions and number of the source emitting parts 12 . the source emitting parts 12 can be formed in various manners . while the present invention has been particularly shown and described with reference to exemplary embodiments thereof , it will be understood by those of ordinary skill in the art that various changes in forms and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims .
a patient position monitoring apparatus capable of monitoring the position of a patient is provided . the patient position monitoring apparatus includes a position guider emitting a source and a plurality of guide markers sensing the source emitted from the position guider and transmitting sensed information to the position guider . the position guider determines whether positions of the guide markers are changed through the sensed information . when the position of the patient is changed , and thus the source emitted from the position guider is out of the range of the guide markers , a warning signal is output . accordingly , a user can monitor a variation in the position of the patient even if the user does not continuously observe the patient .