MRIでの血腫の経時変化

  • 超急性期 hyperacute
    • 細胞内オキシヘモグロビンintracellular oxyhaemoglobin
      • T1WIで等信号 isointense on T1
      • T2WIで等〜低信号 isointense to hyperintense on T2
  • 急性期(1〜2日) acute (1 to 2 days)
    • 細胞内デオキシヘモグロビン intracellular deoxyhaemoglobin
      • T2WI低信号(T2短縮) T2 signal intensity drops (T2 shortening)
      • T1中等度〜低信号 T1 remains intermediate-to-low
  • 亜急性期早期(2〜7日) early subacute (2 to 7 days)
    • 細胞内メトヘモグロビン intracellular methaemoglobin
      • 徐々にT1WI高信号化(T1短縮) T1 signal gradually increases (T1 shortening) to become hyperintense
  • 亜急性期後期 late subacute (7 to 14-28 days)
    • 細胞外メトヘモグロビン extracellular methaemoglobin:
      • over the next few weeks, as cells break down, extracellular methaemoglobin leads to an increase in T2 signal
  • 慢性期(14〜28日) chronic (>14-28 days)
    • 辺縁部 periphery
      • 細胞内ヘモジデリン intracellular haemosiderin
      • T1WI・T2WI低信号 low on both T1 and T2
    • 中心部 center
      • 細胞外ヘミクロム extracellular hemichromes
      • T1WI等信号・T2WI低信号 isointense on T1, hyperintense on T2
  • 参考文献
    • Radiopaedia