The energy crosstalk between X-rays generated by different tube voltages is reduced. An X-ray CT apparatus includes an X-ray tube (5), a high voltage generation unit (10) configured to selectively generate first and second tube voltages, a first filter (61a) formed from a material having substantially the same atomic number as that of a contrast material and configured to perform radiation quality adjustment, a second filter (61b) formed from a material different from the contrast material and configured to perform radiation quality adjustment, a filter switching mechanism (62) configured to switch between the first filter and the second filter, an X-ray detector (8), a reconstruction unit (42) configured to reconstruct an image based on projection data obtained by an output from the X-ray detector, and a control unit (12) configured to control the high voltage generation unit and the filter switching mechanism to synchronize switching between the first and second tube voltages with switching between the first and second filters.
