| 摘要 |
The present invention is directed to perform T2 weighting and suppression of a signal from a specific component in short preparation pulse application time. A first 90° pulse in DE pulses is a pulse which is selectively valid for water and makes the longitudinal magnetization of water turn by 90° about the x axis as a rotation axis. A 180° pulse is a pulse which is valid for water and fat and makes the longitudinal magnetization of water and fat turn by 180° about the x axis as a rotation axis. A second 90° pulse is a pulse which is valid for water and fat and makes the longitudinal magnetization of water and fat turn by 90° about the x axis as a rotation axis. By the DE pulses, the longitudinal magnetization of water is rotated by 360°, and the effect of T2 weighting is obtained in a manner similar to the conventional DE pulses. The longitudinal magnetization of fat is rotated by 270° and does not return to the original longitudinal magnetization so that the effect of suppressing a signal is obtained. Since only application time of the DE pulses is sufficient, time required to apply a preparation pulse does not increase. |
