According to one embodiment, an X-ray computed tomography apparatus includes processing circuitry. The processing circuitry generates first tasks and second tasks, for each of a plurality of reconstruction requests for image reconstruction. The processing circuitry manages an order of execution of the first tasks and the second tasks such that the second tasks are executed after the first tasks. The processing circuitry executes the first tasks and the second tasks in the managed order of execution, based on the projection data set.
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