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基于MR圖像紋理特征的阿爾茨海默病分類(lèi)模型

Classification model for Alzheimer disease basedon texture features of MR images

作者: 陳斯鵬  高妮  田思佳  張鳳  郭秀花 
單位:首都醫(yī)科大學(xué)公共衛(wèi)生學(xué)院(北京100069)
關(guān)鍵詞: 阿爾茨海默病;  Contourlet變換;紋理特征;高斯過(guò)程模型;  輕度認(rèn)知障礙 
分類(lèi)號(hào):R318.04
出版年·卷·期(頁(yè)碼):2017·36·2(134-138)
摘要:

目的 基于MR圖像,提取腦部海馬區(qū)域紋理特征參數(shù)建立阿爾茨海默病(Alzheimer disease, AD)的早期分類(lèi)預(yù)測(cè)模型。方法 研究數(shù)據(jù)來(lái)源于美國(guó)國(guó)立老年研究所ADNI數(shù)據(jù)庫(kù),收集研究對(duì)象的磁共振( magnetic resonance, MR) 腦圖像,分別基于左、右和雙側(cè)海馬圖像,通過(guò)區(qū)域增長(zhǎng)法和Contourlet變換提取紋理特征參數(shù), 結(jié)合研究對(duì)象的基本信息作為特征變量采用高斯過(guò)程分類(lèi)方法建立AD患者和健康對(duì)照的診斷模型以及輕度認(rèn)知障礙(mild cognitive impairment, MCI)患者轉(zhuǎn)變?yōu)锳D的預(yù)測(cè)模型,并評(píng)價(jià)模型的靈敏度、特異度以及ROC曲線(xiàn)下面積。結(jié)果 研究共納入420例研究對(duì)象。基于AD和健康對(duì)照兩組構(gòu)建的分類(lèi)模型,雙側(cè)海馬區(qū)的靈敏度、特異度以及ROC曲線(xiàn)下面積分別為92.7%、87.1% 和0.922,均大于基于左側(cè)或右側(cè)海馬區(qū)圖像建立的模型。基于MCI數(shù)據(jù)建立的AD早期預(yù)測(cè)模型中,靈敏度最高為82.4%,ROC曲線(xiàn)下面積最高為0.836。結(jié)論 基于腦部海馬區(qū)的Contourlet紋理特征構(gòu)建預(yù)測(cè)模型,可以識(shí)別AD早期的病變情況,這將有助于早期監(jiān)測(cè)MCI進(jìn)展為AD,為減緩和治療AD發(fā)病提供依據(jù)。

Objective To establish an early classification and prediction model of Alzheimer’s disease (AD) based on texture parameters of hippocampus of MR image.Methods The data were collected from ADNI database of National Institute on Aging, NIH.Magnetic resonance (MR) brain images were collected and extracted based on left, right and bilateral hippocampal images.Region growing algorithm and Contourlet transformation were used to extract texture features.Combined with the basic information of the research objects and texture features, Gaussian process classification method was used to establish a diagnosis model for AD patients and healthy control subjects, and a predictive model from mild cognitive impairment (MCI) into AD.The sensitivity, specificity and area under the ROC curve were evaluated.Results A total of 420 research objects were included in the study.The sensitivity, specificity and area under the ROC curve of the bilateral hippocampal images in the diagnosis model for AD patients and healthy control subjects were 92.7%, 87.1%, and 0.922, respectively, which were higher than those based on the left or right hippocampal area model.The sensitivity was 82.4% and the area under the ROC curve was 0.836 in AD early prediction model based on MCI data.Conclusions Contourlet texture of the hippocampus can be used to construct the predictive model to identify the early stage of AD, which helps to monitor the progression of MCI to AD, providing evidence for the prevention and treatment of AD.

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