The present invention provides a radiation isocenter quality assurance system for a diagnosis and treatment apparatus using radiation, the system comprising: a gantry capable of rotating around a rotating shaft while spaced apart from the rotating shaft； a radiation irradiating unit which is fixed to the gantry to rotate with the gantry, and irradiates radiation towards the rotating shaft； a collimator which can be inserted into the radiation irradiating unit； an isocenter measurement module including a pair of first radiation reaction members of which upper and lower surfaces face each other in parallel and a pair of second radiation reaction members of which front and rear surfaces face each other in parallel, for measuring the isocenter of radiation irradiated from the radiation irradiating unit； a control unit which controls the rotation of the gantry and the irradiation of radiation through the radiating irradiating unit； and a three-dimensional coordinate calculation unit which calculates the radiation isocenter from location information corresponding to a radiological trace represented on the pair of first radiation reaction members and the pair of second radiation reaction members. The control unit irradiates radiation to the pair of first radiation reaction members while fixing the gantry and rotating the collimator and irradiates radiation to the pair of second radiation reaction members while fixing the collimator and rotating the gantry, and thus may obtain the radiation isocenter.La présente invention concerne un système d'assurance de qualité d'isocentre de rayonnement pour un appareil de diagnostic et de traitement utilisant un rayonnement, le système comprenant: un portique apte à tourner autour d'un axe rotatif tout en étant espacé de l'axe rotatif； une unité d'irradiation de rayonnement qui est fixée au portique pour tourner avec le portique, et irradie un rayonnement vers l'axe rotatif； un collimateur qui peut être inséré dans l'unité d'irradiatio
