高速SE撮像における撮像パラメータとj-couplingとMT-effectの相対的関係

概要

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The fast spin echo (SFE) technique has recently been used for routine MRI clinical studies because FSE images show contrast for most tissues similar to that of conventional SE images in a much reduced imaging time. There are, however, important differences in contrast in certain tissues;for example, fat has higher signal intensity on FSE images than on conventional SE images, often creating problems in clinical diagnosis. The difference is affected by j-coupling and the magnetization transfer effect. The purpose of this study was to assess whether FSE scanning parameters [echo train length (ETL), echo spacing, multi-slicing, and radiofrequency refocusing pulse angle] are affected by j-coupling and the magnetization transfer effect. Effective T_1 and T_2 relaxation times for various contrast phantoms were measured under different scanning parameters. The results demonstrated that increased ETL and decreased echo spacing affected both j-coupling and the magnetization transfer effect, while using multi-slicing affected the magnetization transfer effect. The radiofrequency refocusing pulse angle showed no effect.
社団法人日本放射線技術学会の論文
2001-08-20