Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
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Evaluation of Crosstalk Effect on Spin-echo Images at 1.5 and 3 T
Masaaki KajisakoTosiaki MiyatiMasahiro TaniguchiYuko SyakudoKoji KoizumiAkira HiragaYukio Miki
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2011 Volume 67 Issue 7 Pages 779-784

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Abstract

The purpose of this study is to evaluate the crosstalk effect on spin-echo (SE) images at 1.5 and 3 T MRI. We examined the influence of crosstalk by comparing the full width at half-maximum (FWHM) and slice profile of images of a wedge-shaped phantom for various slice gaps. We also assessed crosstalk effect in the brain by comparing image contrast among healthy volunteers (n=8). Among the subjects, the shapes of the slice profiles at 1.5 T were similar to those at 3 T for long repetition times (TRs); however, at shorter TRs, differences in slice profiles were observed among the subjects and were more apparent at 3 than at 1.5 T. The relative contrast between white matter and gray matter on T1-weighted images was lower at 3 than at 1.5 T. The crosstalk effect was strongest when the TR of the excitation pulse was short. The influence of the adjacent excitation pulse is important in the process of T1 relaxation because T1 values are greater at 3 T. In conclusion, the influence of crosstalk on SE T1-weighted images is greater at 3 than at 1.5 T.

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© 2011 Japanese Society of Radiological Technology
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