Patent ID: 8913712

Claim:
An X-ray CT apparatus comprising: a reference image acquisition unit that acquires a reference image by irradiating a subject placed on a bed with X-rays, a movable region calculating unit that calculates a transversely movable region of the bed on the basis of height of the bed and size of the subject, and/or calculates an up and down movable region of the bed on the basis of position of the bed for the transverse direction and size of the subject, a movement destination setting unit that sets a movement destination of the bed within the transversely movable region and/or the up and down movable region calculated by the movable region calculating unit, a filter size setting unit that sets size of a filter for adjusting radiation intensity of the X-rays, an imageable region calculating unit that calculates an imageable region on the basis of the movement destination of the bed set by the movement destination setting unit and the filter size set by the filter size setting unit, and a displaying unit that displays the imageable region calculated by the imageable region calculating unit superimposed on the reference image.