PROBLEM TO BE SOLVED: To provide a method for scaling the intensity distribution of a scattered radiation component, based on a detector signal in a multi-tube type X-ray CT apparatus, and also to provide the multi-tube type X-ray CT apparatus.SOLUTION: A first difference is obtained, that is the difference between actual data of X-ray intensity obtained by allowing X-rays respectively radiated from a plurality of X-ray generating parts to transmit a subject and opposite data of the X-ray intensity obtained by allowing the X-rays to transmit the same position of the subject in the opposite direction. A primary scattered radiation included in the actual data is estimated. A primary scattered radiation is estimated, which is included in the opposite data obtained by allowing the X-rays to respectively transmit the same position of the subject in the opposite direction. Then, a second difference is obtained, that is the difference between the scattered radiation intensity included in the actual data and the scattered radiation intensity included in the opposite data. An estimated primary scattered radiation intensity distribution is scaled based on a ratio between the first difference and the second difference.COPYRIGHT: (C)2009,JPO&INPIT【課題】多管球X線CT装置における検出器信号から、散乱線成分の強度分布をスケーリングする方法および多管球X線CT装置が提供される。【解決手段】複数のX線発生部からそれぞれ照射されたX線が被写体を透過することにより得られたX線強度の実データと、前記被写体の同一位置を反対方向にこれらX線が透過することにより得られたX線強度の対向データと、の第1の差分を求め、前記実データに含まれる一次散乱線を推定し、前記被写体の同一位置を反対方向にX線がそれぞれ透過することにより得られるX線強度の前記対向データに含まれる一次散乱線を推定し、前記実データに含まれる散乱線強度と前記前記対向データに含まれる散乱線強度との第2の差分を求め、前記第1の差分と前記第2の差分の比に基づいて、前記推定された一次散乱線強度分布のスケーリングを行う。【選択図】図6
