Patent ID: 7130369

Claim:
An imaging tomography apparatus comprising: a first data acquisition system disposed in a first measurement plane, comprising a first radiation radiator and a first radiation detector that generates first detector output signals representing absorption of radiation from said first radiation radiator; a second data acquisition system disposed in a second measurement plane, different from said first measurement plane, comprising a second radiation radiator and a second radiation detector that generates second detector output signals representing absorption of radiation emanating from said second radiation radiator; said first data acquisition system and said second data acquisition system being mounted for rotation around a rotational axis common to both said first data acquisition system and said second data acquisition system; a reference object positionable on said rotational axis in each of said first and second measurement planes; and a calculation unit, supplied with said first detector output signals and said second detector output signals, that calculates, for at least one rotation angle position of said first and second data acquisition systems with said first and second data acquisition systems being rotated at a substantially constant rotation angle speed, a first measurement value from said first detector output signals representing attenuation by said reference object of said radiation emanating from said first radiation radiator, and a second measurement value from said second detector output signals representing attenuation by said reference object of said radiation emanating from said second radiation radiator, and that determines position correction values for each of said first and second measurement planes from said first and second measurement values, representing respective deviations of said first and second measurement planes from respective pre-set positions of said first and second measurement planes, by determining said rotational axis and wherein said calculation unit determines said position correction values as a difference between said first measurement value and said second measurement value.