This X-ray CT device comprises: a scan gantry section which irradiates a subject with X-rays and detects X-rays transmitted through the subject； a bed on which the subject lies and which conveys the subject into/out of the X-ray radiation range of the scan gantry section； a console which controls each section of the scan gantry section, acquires measurement data measured by the scan gantry section, and includes a data processing device that generates an image from the measurement data, said image including tomographic images of the subject. The data processing device comprises: an extraction section which acquires AR data measured using the X-ray CT device, further acquires the measurement data from imaging the subject, and extracts sensitivity distribution data, which is a sensitivity distribution component of a detection element, and blank data, from which the sensitivity distribution component has been eliminated, from the AR data； and a projection data generation section which eliminates noise and the sensitivity distribution component included in the measurement data on the basis of the sensitivity distribution data and uses the blank data to perform compensation processing on the measurement data from which the sensitivity distribution component and the noise have been eliminated.L'invention concerne un dispositif CT à rayons X qui comporte : une section de portique de balayage qui irradie un sujet avec des rayons X et qui détecte des rayons X transmis à travers le sujet ； un lit sur lequel le sujet s'allonge et qui transporte le sujet dans la plage de rayonnement de rayons X de la section de portique de balayage et hors de celle-ci ； une console qui commande chaque section de la section de portique de balayage, qui acquiert des données de mesure mesurées par la section de support mobile de balayage et qui comprend un dispositif de traitement de données qui génère une image à partir des données de mesure, ladite image comprenant des images tomographiques du su
