Optimal Respiratory Ordering Scheme (OROS) for Correcting Blurring Artifacts in Abdominal Magnetic Resonance Imaging

복부 핵자기공명 영상에서 영상번짐의 교정을 위한 최적 호흡 정렬법

In abdominal NMR imaging the respiratory ordering techniques have been successfully used to remove the ghosting artifacts arising from the respiratory motion. In the existing respiratory ordering schemes, however, it is generally accepted that blurring of the moving parts still remains as in the signal averaging technique. A new optimal respiratory ordering scheme which can correct the blurring as well as the ghosting artifacts is theoretically derived through the analysis of the phase encoding directional motion effects in Fourier imaging. The performance of the optimal respiratory ordering scheme is experimentally confirmed together with a suboptimal ordering scheme which is suggested as a compromise for the practicality.