Investigative Magnetic Resonance Imaging

Korean Society of Magnetic Resonance in Medicine (대한자기공명의과학회)
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T2 Relaxation Times of the Cingulate Cortex, Amygdaloid Body, Hippocampal Body, and Insular Cortex: Comparison of 1.5 T and 3.0 T

대상회 피질, 편도체, 해마체, 도피질의 T2 이완시간: 1.5테슬러와 3.0테슬러 자기공명영상장치의 비교

  • Lee, Ho-Joon (Department of Radiology, Research Institute of Radiologic Science, Yonsei University College of Medicine) ;
  • Kim, Eung-Yeop (Department of Radiology, Research Institute of Radiologic Science, Yonsei University College of Medicine)
  • 이호준 (연세대학교 의과대학 영상의학과) ;
  • 김응엽 (연세대학교 의과대학 영상의학과)
  • Received : 2011.01.19
  • Accepted : 2011.03.07
  • Published : 2011.04.30
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Abstract

Purpose : To compare T2 relaxation times (T2) in the cingulate cortex, amygdaloid body, hippocampal body, and insular cortex between 1.5T and 3.0T MR imagers. Materials and Methods : Twelve healthy volunteers underwent FLAIR and CPMG imaging perpendicular to the hippocampal body at both 3.0T and 1.5T. T2 was measured in the cingulate cortex, amygdaloid body, hippocampal body, and insular cortex. The T2 relaxation time ratios of the cingulate cortex, insular cortex, and amygdaloid body to the hippocampal body were compared between 1.5T and 3.0T. Results : The mean T2 of the cingulate cortex, amygdaloid body, hippocampal body, and insular cortex at 1.5T were $109.5{\pm}3.1$, $117.0{\pm}7.1$, $114.7{\pm}2.4$, and $111.3{\pm}2.4$, respectively; $99.7{\pm}3.8$, $100.7{\pm}4.3$, $97.9{\pm}3.4$, and $96.2{\pm}2.0$, respectively, at 3.0T. Percentage changes of T2 in the cingulate cortex, insular cortex, amygdaloid body, and hippocampal body at 3.0T with respect to those at 1.5T were -8.9%, -13.5%, -14.6%, and -13.5%, respectively. The mean T2 ratios of the cingulate gyrus, insular cortex, and amygdaloid body to the hippocampal body at 1.5T and 3.0T were 0.96 and 1.02 (p = 0.003); 1.02 and 1.03 (p>0.05); 0.97 and 0.98 (p>0.05), respectively. Conclusion : T2 decrease in the cingulate cortex was less than the amygdaloid body, insular cortex, and hippocampal body at 3.0T. The mean T2 ratio of the cingulate gyrus to the hippocampal body was significantly different between 1.5T and 3.0T.

목적 : 1.5T와 3.0T MRI에서 대상회 피질, 편도체, 해마체, 도피질의 T2 이완시간 (T2)을 비교하고자 하였다. 대상 및 방법 : 건강한 12명의 자원자를 대상으로 1.5T와 3.0T에서 해마에 대해 수직으로 FLAIR와 CPMG 펄스열 영상을 같은 조건으로 획득하였다. 대상회 피질, 편도체, 해마체, 도피질에서 T2를 측정하였고, 해마와 나머지 부위의 T2 비를 1.5T와 3.0T 사이에서 비교하였다. 결과 : 1.5T에서 측정한 평균 T2는 대상회 피질, 편도체, 해마체, 도피질에서 각각 $109.5{\pm}3.1$, $117.0{\pm}7.1$, $114.7{\pm}2.4$, $111.3{\pm}2.4$, 3.0T에서 측정한 값은 각각 $99.7{\pm}3.8$, $100.7{\pm}4.3$, $97.9{\pm}3.4$, $96.2{\pm}2.0$ 이었다. 1.5T와 3.0T 사이의 T2 변화 백분율은 각각 -8.9%, -13.5%, -14.6%, -13.5% 이었다. 1.5T와 3.0T 사이에서 해마체에 대한 대상회 피질, 편도체, 도피질의 T2 비는 각각 0.96 과 1.02 (p=0.003), 1.02 과 1.03 (p > 0.05), 0.97 과 0.98 (p > 0.05) 이었다. 결론 : 3.0T에서 대상회 피질의 T2 감소는 편도체, 도피질, 해마체와 비교해서 상대적으로 적었고, 대상회 피질과 해마체의 T2 이완시간비는 1.5T와 3.0T에서 의미 있는 차이를 보였다.

Keywords

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