中国汉族正常成人海马体积的高分辨率MRI测量

目的 测量中国汉族成人海马体积的正常值范围,为各种导致海马结构改变疾病的临床诊断和科学研究提供基础性数据.方法 采用全国多中心临床研究形式,选取18～70岁健康志愿者1000名,按照年龄18～30、31～40、41～50、51～60、61～70岁进行分组,每组男、女各100名.所有受试者均行3D磁化强度预备梯度回波序列T1WI,应用3D体积分析软件手工勾绘ROI,测量健康中国成年人海马的体积.采用多元线性回归方法探讨海马体积与性别、年龄、体重和身高的关系.不同性别、侧别间海马体积的差别采用两独立样本t检验.不同性别和年龄分组间采用方差分析.结果 左、右侧海马体积分别为(4752±659)、(5032±660)mm3,与性别和年龄相关(左、右侧r值分别为0.283和0.311,F值分别为30.127和37.050,P值均<0.01),而与身高和体重不相关(P<0.05).男性左、右侧海马体积分别为(4897±670)、(5192±667)mm3,女性左、右侧海马体积分别为(4647±624)、(4904±630)mm3,右侧海马体积均大于左侧(t值分别为7.030、6.696,P值均<0.05),男性左、右海马体积均大于女性(t值分别为6.586、7.326,P值均<0.05).男性5组左侧海马体积分别为(4981±684)、(5003±609)、(4976±657)、(4841±631)、(4631±681)mm3,右侧海马体积分别为(5340±647)、(5276±582)、(5264±620)、(5133±661)、(4894±699)mm3,5组间差异均有统计学意义(左、右侧F值分别为5.737和7.607,P值均<0.01),其中男性两侧海马结构在18～30、31～40、41～50岁组分别与61～70岁组比较,差异均有统计学意义(P值均<0.05),其余各组间差异无统计学意义(P>0.05).女性不同组别的海马体积差异无统计学意义(P>0.05).结论 采用高分辨率MRI获得中国汉族正常人不同年龄段的海马体积数据,为进一步研究海马相关疾病提供了基础性数据.

Measuring the volume of the hippocampes in healthy Chinese adults of the Han nationality on the high-resolution MRI

Objective To measure the volume of hippoeampal formation(HPF) in healthy Chinese Han adults and provide database for researching on a variety of diseases associated with alteration of hippocampal structure. Methods This is a clinical multi-center study. One thousand Chinese healthy volunteers (age range = 18 to 70) recruited from 15 hospitals were divided into 5 groups, i. e. , Group A (age range = 18 to 30), B (age range =31 to40), C (age range =41 to 50), D (age range=51 to 60),and E (age range =61 to 70). Each group contained 100 males and 100 females. All of the volunteers were scanned by MR using T1 weighted three-dimensional magnetization prepared rapid acquisition gradient echo sequence. The margin of HPF were outlined manually for each side. Using multiple linear regression,relationships between hippocampal volume and sex, age, weight and height were analyzed respectively.Independent two sample t test was used to study the differences between male and female and between lcft and right. The differences of hippoeampal volume among age groups were analyzed by ANOVA. Results Hippocampal volume for left and right side were (4752 ± 659) and (5032 ± 660) mm3 respectively. The volume of HPF is significant correlated with gender and age, but without relevance to height and weight ( left and right r = 0. 283,0. 311, F = 30. 127,37. 050 ,P < 0. 01 ). The volumes of left and right hippocampus were (4897 ± 670), (5192 ± 667)mm3 respectively for men, and (4647 ± 624) and (4904 ± 630) mm3 for women. The right hippocampal volume was larger than the left ( t = 7. 030,6. 696, P < 0. 05 ). On both sides, men have larger hippocampus than that of women ( t = 6. 586,7. 326, P < 0. 01 ). The volumes of the left hippocampus among the five age groups in the male were (4981 ± 684), ( 5003 ± 609 ), (4976 ± 657 ),(4841 ± 631 ), (4631 ± 681 ) mm3 respectively, while the volumes of the right hippoeampus were (5340 ±647) ,(5276 ±582), (5264 ±620), (5133 ±661 ), (4894 ±699) mm3 respectively. Among age groups,the differences were statistically significant ( left and right F = 5. 737,7. 607, P < 0. 01 ). For male, there was significant difference of bilateral hippoeampus between the 18-30, 31-40, 41-50 years group and 61-70 years group ( P < 0. 05 ) and there was no significant difference among the other groups ( P > 0. 05 ).There was no significant difference of hippocampal among different groups in women (P > 0. 05 ).Conclusions With high-resolution MRI, the volume of the HPF was accurately measured, so as to provide the basic data for research of the hippocampus-related disease.