An apparatus includes a bed (1) arranged to support a subject and having an insertion hole (1a) through which a subject portion that is part of the subject is inserted a fixed compression plate (10) and a movable compression plate (12) arranged to hold and compress the subject portion when the subject portion is inserted through the insertion hole, the movable compression plate being movable relative to the fixed compression plate and a unit (2) including the fixed compression plate and the movable compression plate. The unit is movable relative to the bed.
