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목록지그재그 k-space (1)
방사선사나라 Radiographer Nara
[MRI] (영/한) Nyquist ghost artifact on EPI / 이피아이 기법에서 나이키스트 유령 인공물
(English) The Nyquist ghost artifact on EPI? When sampling data, the bandwidth must be given at least twice the signal per 1Hz to know the frequency. However, in the case of the EPI pulse sequence, since it has a zig-zag trajectory through k-space, the echo moves slightly from the center point for each phase encoding step. The artifact that appears due to this is called the Nyquist ghost artifac..
자기공명영상 (MRI)
2020. 5. 13. 10:41