Shiotani Seiji, Kobayashi Tomoya, Hayakawa Hideyuki, Homma Kazuhiro, Sakahara Harumi
Department of Radiology, Seirei Fuji Hospital.
Magn Reson Med Sci. 2016 Jul 11;15(3):281-7. doi: 10.2463/mrms.mp.2015-0086. Epub 2015 Dec 22.
To measure T1 and T2 values of hepatic postmortem magnetic resonance (PMMR) imaging.
We performed hepatic PMMR imaging of 22 deceased adults (16 men, 6 women; mean age, 56.3 years) whose deaths were for reasons other than liver injury or disease at a mean of 27.7 hours after death. Before imaging, the bodies were kept in cold storage at 4°C (mean rectal temperature, 17.6°C). We measured T1 and T2 values in the liver at two sites (the anterior segment of the right lobe and the lateral segment of the left lobe). We also investigated the influence of the body temperature and postmortem interval on T1 and T2 values.
In the anterior segment of the right lobe and the lateral segment of the left lobe, T1 values of PMMR imaging were 524 ± 112 ms and 472 ± 104 ms (mean ± standard deviation), respectively; while T2 values were 42 ± 6 ms and 43 ± 8 ms, respectively. T1 and T2 values did not differ significantly between the two sites (P ≧ 0.05). Regarding temperature, the T2 values of hepatic PMMR imaging were linearly correlated with the body temperature, but the T1 values were not. The T1 and T2 values of the two sites in the liver did not correlate with the postmortem interval.
Reduction in body temperature after death is considered to induce T1 and T2 value changes in the liver on PMMR imaging.
测量肝脏死后磁共振成像（PMMR）的T1和T2值。
我们对22名成年死者（16名男性，6名女性；平均年龄56.3岁）进行了肝脏PMMR成像，这些死者的死亡原因并非肝损伤或疾病，死亡后平均27.7小时进行成像。成像前，尸体保存在4°C的冷藏环境中（平均直肠温度17.6°C）。我们在肝脏的两个部位（右叶前段和左叶外侧段）测量了T1和T2值。我们还研究了体温和死后间隔时间对T1和T2值的影响。
在右叶前段和左叶外侧段，PMMR成像的T1值分别为524±112毫秒和472±104毫秒（平均值±标准差）；而T2值分别为42±6毫秒和43±8毫秒。两个部位的T1和T2值差异无统计学意义（P≥0.05）。关于温度，肝脏PMMR成像的T2值与体温呈线性相关，但T1值并非如此。肝脏两个部位的T1和T2值与死后间隔时间无关。
死后体温降低被认为会导致肝脏在PMMR成像上的T1和T2值发生变化。
