J Korean Soc Magn Reson Med.  1997 Dec;1(1):79-85.

Improvement of Gibb

• Ahn CB
• Kim CY
• Ryu WS
• Oh CH
• Yi Y
• Shin JK

Abstract

Fast spin echo imaging utilizes multiple spin echoes to encode multiple k-space lines instead of multiple T2-weighed images. As results, intensities in k-space data are varying according to T2 decay, which generates Gibb's artifact in the reconstructed image. The echo time for encoding dc block determines contrast, as is specified by the effective echo time, however allocation of other echoes to different k-space frequency blocks in fast spin echo imaging os not fully investigated. In this study, symmetric arrangement of multiple echoes in k-space is investigated to reduce Gibb's artifact. Design of filters based on the measurement of multiple echo intensities is also proposed in two stage manner, i.e., equalization and filtering. From simulation and experiment, it was observed that Gibb's phenomena were substantially reduced by the proposed methods.

MeSH Terms

Artifacts