Investigative Magnetic Resonance Imaging
- 제1권1호
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- Pages.66-74
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- 1997
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- 2384-1095(pISSN)
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- 2384-1109(eISSN)
뇌기능 영상을 위한 TRFGE와 CGE 기법에서 자화율 효과의 정량적 해석
Quantitative Analysis of Susceptibility Effects in TRFGE and CGE Sequences for Functional MRI
초록
혈액의 산소화와 불 산소화에 따른 국부적인 자화율 효과의 변화에 의한 자장의 불 균일성에 민감한 경사 자장 에코 기법은 현재의 뇌기능 MR 영상의 기본이 되고 있다. 일반적으로 이러한 경사 자장 에코기법은
fMRI, functional MRI introduced receently appears based on the gradient echo technique which is sensitive to the field inhomogeneity developed due to the local susceptibility changes of blood oxygenation and deoxygenation. There has been many variants of the basic gradient echo sequence which is sensitive to the local inhomogeniety, among others such as GRASS or SSFP to EPISTAR are the most commonly used gradient echo techniques. Common to all these gradient echo techniques is that the signal due to the susceptibility effects is generally decreased with increasing inhomogeneity due to the