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KMID : 0357520090320010101
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Journal of Radiological Science and Technology
2009 Volume.32 No. 1 p.101 ~ p.106
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Flip Angle of the Optimal T1 Effect Using FLASH Pulse Sequence at 3T Abdominal MRI
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Han Jae-Bok
Choi Nam-Gil
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Abstract
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Purpose of this study is to compare the signal intensity (SI) and CNR with T1 weighted image using FLASH at 3T abdominal MRI by varying flip angle (FA). Totally 20 patients (male : 12, female : 8, Age : years with mean : 51) were examined by 3 Tesla MR scanner (Magnetom Tim Trio, SIEMENS, Germany) with 8 channel body array coil between september and October 2008. Imaging parameters were as follows : FLASH sequence, TR : 120 ms, TE : minimum, FOV (field of view) : , Matrix : , slice : 6 mm, scan time : 15 sec and Breath-hold technique. Abdominal image, with a 50 ml syringe filled with water placed in the FOV measuring the water signal, were acquired with varying FA through to with interval. SI’s were measured three times at liver parenchyme, water, spleen and background and averaged. The CNR’s were measured between the ROIs (region of interest). Statistic analysis was performed with ANOVA test using SPSS software (version 17.0). Less than FA , abdominal images were severely inhomogeneity. Especially, T1 effect of water signal was weak. As the flip angle increased, the signal intensity decreased at all the regions. Especially, flip angle of the highest signal intensity was observed with at the liver parenchyme, at water, at the spleen, respectively. The CNR between liver and water was -60.92 at FA and 15.16 at FA . The CNR between liver and spleen was -3.18 at FA and 9.65 at . In conclusion, FA is optimal for T1 weighted effect using FLASH pulse sequence at 3.0 T abdominal MRI.
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KEYWORD
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Flip angle(FA), FLASH, T1-relaxation, CNR
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