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KMID : 0858520070110010039
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Journal of the Korean Society of Magnetic Resonance in Medicine
2007 Volume.11 No. 1 p.39 ~ p.48
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The Comparison between Single Shot Turbo Spin Echo and B-FFE (Balanced Turbo Field-echo) in the Differentiation of Focal Liver Lesions
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Kim Young-Chul
Kim Myung-Jin
Cha Seung-Hwan
Chung Yong-En
Han Kwang-Hyub
Choi Jin-Sub
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Abstract
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Purpose : To determine the diagnostic accuracy of four different sequences : moderately T2 weighted, two heavily T2-weighted single shot turbo spin-echo sequence and breath-hold axial-2D balanced turbo field-echo sequence(bFFE) for characterization of focal lesions.
Materials and Methods : During the 3-month period between June and August 2005, seventy-six patients were proved to have ninety-three focal hepatic lesions on MR imaging. The patients consisted of 49 men and 27 women (age range, 15-75 years; mean age, 56.23 years). All MR images were acquired on a 1.5-T MR using the following sequences: 1. A breath-hold axial T2-weighted single shot turbo spin-echo sequence, 2. a breath-hold axial-2D balanced turbo field-echo sequence. Two radiologists performed quantitative analysis. Another radiologist measured the lesion-to-liver contrast-to-noise ratio at the region-of-interest in the four sequences.
Results : There was no significant difference in inter-observer variability between the four sequences. The accuracy for both cyst and malignancy of moderate T2 weighted MRI (echo time: 80 msec) was also highest. There was significant difference for lesion characterization between moderate T2 weighted MRI and balanced steady state procession (p-value: 0.004) in the second reader. For longer echo time, the CNR of cystic lesions were markedly increased in comparison to lesions of other component.
Conclusion : The accuracy and inter-observer variability of single shot turbo spin echo T2 weighted sequence was higher than bFFE. Although there was no statically significant difference, moderate T2 weighted MRI (echo time: 80 msec) was more accurate than heavily T2 weighted sequence (echo time:300 msec). If the results for lesion characterization is equivocal in TE 80, the addition of heavily T2weighted MRI (echo time: 180 msec) can be helpful.
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KEYWORD
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Heavily T-2 weighted MRI turbo spin echo, Steady state free procession echo time
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