PROBLEM TO BE SOLVED: To provide a method for removing a noise of a PET signal in a PET-MRI fusion device without an MRI RF shield that deteriorates an image quality of the PET-MRI fusion device.SOLUTION: A method comprises a step of performing analog filtering in which, after a PET output signal is inputted by a PET-MRI fusion device, a noise component due to a RF pulse frequency is removed from the PET output signal by using a correlation between a frequency of the PET output signal and a MRRF frequency (Lamor frequency) and a step of, after a signal on which the filtering has been performed is inputted, converting the signal to a digital signal through sampling. A molecular image is thus obtained without deteriorating performance of a PET detector in an MRI environment.COPYRIGHT: (C)2012,JPO&INPIT【課題】PET-MRI融合装置の映像品質を低下させるMRI RF遮蔽物なしにPET-MRI融合装置でのPET信号のノイズを除去する方法を提供する。【解決手段】方法は、PET-MRI融合装置でPET出力信号を入力されて、PET出力信号の周波数とMRRF周波数(Lamor frequency)との間の相関関係を用いて、PET出力信号からRFパルス周波数によるノイズ成分を除去してアナログフィルタリングする段階と、フィルタリングされた信号を入力されて、サンプリングを通じてデジタル信号に変換する段階と、を含む。MRI環境でPET検出器の性能低下なしに分子映像を獲得することができる。【選択図】図5
