Fast RecoveryパルスによるFast Spin Echo画像の信号強度の増加に関する検討

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The aim of the present study was to evaluate the increase in signal intensity caused by applying the fast recovery (FR) technique to fast spin echo (FSE) images, that is, the fast recovery fast spin echo (FR-FSE) method. All images of phantoms, whose T_2 values were different, were acquired with a Signa 1.5 Tesla system (GE Medical Systems) using the three-dimensional (3D) FSE and 3D FR-FSE sequences. We assessed the increased signal intensity as follows : (signal intensity on the FR-FSE image - FSE image) /FSE image (%). Our results showed that the increased signal intensity became high when l) T_2 of the phantom was prolonged, 2) TR was shortened, and 3) echo train length (ETL) was decreased. By utilizing the results of this study, the increased signal caused by the FR technique could be estimated quantitatively when the TR, ETL, and T_2 of investigated substances were determined. For example, when TR, ETL, and T_2 were 1500 msec, 16-64, and 1500 msec, respectively, the increase in signal intensity was estimated to be approximately 70%. In addition, when T_2 was less than approximately 250 msec, signal intensity was not significantly increased by the FR pulses, that is, the FR-FSE image was the same as the FSE image. Accordingly, the FR-FSE method was confirmed to enhance the signal in substances with longer T_2, while maintaining the same contrast of the image as that obtained by the conventional FSE method. Our results are useful for evaluating the increased signal intensity caused by employing the FR technique.
公益社団法人日本放射線技術学会の論文
2003-07-20

Fast RecoveryパルスによるFast Spin Echo画像の信号強度の増加に関する検討

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