arrangement of the X-ray source and detector, movement path, irrespective of the movement range, as in the obtainable X-ray CT apparatus measurement image at a rotation angle of 180 degrees or more, to obtain a high-precision image. The measurement image detected by the detector, and a X-ray source detector for converting the rotational measurement image is acquired by rotating moving on concentric trajectories. Then, for each measured angle of rotation measurement image, the rotational angle range by applying the weight assigned the same strength change and the reconstructed image obtained from the rotation measurement images obtained by the measurement of 180 degrees, perform a reconstruction operation, obtain the reconstructed image.X線源および検出器の配置、移動軌道、移動範囲によらず、180度以上の回転角度で計測像を取得可能なX線CT装置と同様に、高精度な画像を取得する。検出器で検出した計測像を、X線源と検出器とが同心円軌道上を回転移動することにより取得する回転計測像に変換する。そして、回転計測像の計測角度毎に、回転角度範囲が180度の計測で得る回転計測像から得られた再構成像と同等の強度変化を付与する重みを適用し、再構成演算を行い、再構成像を得る。
