1.中山大学附属第一医院放射科,广东 广州 510080
2.华中科技大学协和深圳医院放射科,广东 深圳 518000
3.四川省肿瘤医院放射科,四川 成都 610000
黄颖倩,硕士研究生,研究方向:神经系统影像诊断,E-mail:huangyq97@mail2.sysu.edu.cn
收稿:2020-09-15,
纸质出版:2021-01-20
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黄颖倩,赵静,初建平等.基于不同扩散模型的扩散加权成像在脑胶质瘤分级和预测IDH-1突变的对比分析[J].中山大学学报(医学科学版),2021,42(01):87-94.
HUANG Ying-qian,ZHAO Jing,CHU Jian-ping,et al.Evaluating Glioma in Terms of Grading and Predicting IDH-1 Mutation Status by Advanced Diffusion Weighted Imaging: A Comparative Study of DTI, DKI and NODDI[J].Journal of Sun Yat-sen University(Medical Sciences),2021,42(01):87-94.
黄颖倩,赵静,初建平等.基于不同扩散模型的扩散加权成像在脑胶质瘤分级和预测IDH-1突变的对比分析[J].中山大学学报(医学科学版),2021,42(01):87-94. DOI:
HUANG Ying-qian,ZHAO Jing,CHU Jian-ping,et al.Evaluating Glioma in Terms of Grading and Predicting IDH-1 Mutation Status by Advanced Diffusion Weighted Imaging: A Comparative Study of DTI, DKI and NODDI[J].Journal of Sun Yat-sen University(Medical Sciences),2021,42(01):87-94. DOI:
目的
2
对比分析基于不同扩散模型的扩散加权成像(扩散张量成像:DTI,扩散峰度成像:DKI,和神经突起方向离散度与密度成像:NODDI)在脑胶质瘤术前预测脑胶质瘤级别和异柠檬酸脱氢酶-1(
IDH-1
)突变的诊断效能。
方法
2
回顾性分析中山大学附属第一医院2014年5月至2019年12月经手术病理证实的胶质瘤患者66例(WHO Ⅱ级28例,Ⅲ级10例,Ⅳ级28例),其中
IDH-1
基因表型明确的患者64例(
IDH-1
突变型34例,野生型30例)。采用德国西门子Magnetom Verio 3.0T MRI机器进行数据采集,扫描序列包括常规MRI平扫,增强和扩散加权成像。后处理获取DTI(平均扩散系数:MD,部分各向异性分数:FA),DKI(平均峰度:MK,轴向峰度: Ka,径向峰度:Kr)和NODDI(神经突内体积分数:icvf,神经突方向离散度:odi)的各参数图。用Image J勾画肿瘤实质相邻最大的三个层面作为ROI,取得各个参数的均值。采用独立样本
t
检验或Mann-Whitney秩和检验分别比较高、低级别组和不同
IDH-1
状态各扩散参数值的差异。进一步,对有统计学意义差异的参数进行Logistic回归分析,评价其鉴别脑胶质瘤高低级别和
IDH-1
基因突变状态的诊断效能,并获得受试者工作特征(ROC)曲线。
结果
2
基于不同的扩散加权模型,其扩散参数均可以用于区分脑胶质瘤级别(
P
<
0.01),其中ROC分析发现MK在鉴别高低级别脑胶质瘤具有最大的诊断效能,ROC曲线下面积为0.84。进一步Logistic回归分析发现仅年龄和MK参数可以用来鉴别高低级别脑胶质瘤,诊断价值[
AUC
=0.88,
AUC
95%CI(0.79,0.96)]优于单一的MK参数。对
IDH-1
基因突变状态预测,NODDI两个参数均无鉴别意义,DKI和DTI的各参数可有效鉴别(
P
<
0.05)。其中,DKI的Ka参数具有最高的诊断价值,ROC曲线下面积为0.73,灵敏度也最高(0.83)。进一步Logistic回归发现,仅Kr可以预测
IDH-1
突变,回归模型ROC曲线下面积[AUC=0.72,AUC 95%CI(0.59, 0.85)]。
结论
2
基于不同扩散模型的扩散加权成像均可以用于预测脑胶质瘤级别,DKI诊断价值最优;对于
IDH-1
突变状态的预测,DKI优于DTI,而NODDI价值有限。推荐DKI用于临床脑胶质瘤术前评估。
Objective
2
To assess the diagnostic efficiency of different diffusion models (DTI, DKI and NODDI) in grading glioma and predicting
IDH-1
mutation status, and to further build logistic regression prediction models.
Methods
2
Totally 66 patients (22 females; mean age: 47.8) with pathologically proved gliomas were retrospectively included. All cases underwent bipolar spin echo diffusion examination. Parameters of DKI (MK; Ka; Kr), DTI (MD and FA) and NODDI (intracellular volume fraction: icvf, orientation dispersion index: odi) were derived. ROIs were manually drawn and corresponding average values were calculated. Logistic regression was performed to build a predictive model. ROC curve was obtained, and Hosmer-lemeshow test was carried out to test the goodness of fit.
Results
2
DKI, DTI and NODDI parameters were significantly different between HGGs and LGGs (
P
<
0.01). And among all diffusion parameters, a further logistic regression model for grading glioma only included age and MK, which showed the highest diagnostic value [
AUC
=0.88,
AUC
95%CI (0.79, 0.96)]. Hosmer-lemeshow Test present excellent of goodness of fit. With
IDH-1
mutation status, NODDI showed no significant value for distinction, whereas DKI and DTI can significantly differentiate
IDH-1
mutated and non-mutated glioma (
P
<
0.05). Further logistic regression only selected Kr (
P
<
0.01) in the model, which demonstrated the highest diagnostic value [
AUC
=0.72,
AUC
95%CI (0.59, 0.85)].
Conclusions
2
DKI is superior to DTI and NODDI in grading gliomas and identifying
IDH-1
mutation status. The model of MK value and age variables present the best discriminatory capacity for grading glioma and Kr value may serve as a potential predictive index for identify
IDH-1
mutation.
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