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Alzheimer病MR圖像紋理和形態(tài)學(xué)特征的比較研究

Comparison of Texture Analysis with Morphological Measure Based on the MR Images of Alzheimer’s Disease

作者: 劉卓    周曉霞    童隆正    李昕    夏翃 
單位:北京大學(xué)人民醫(yī)院放射科(北京100044)
關(guān)鍵詞: 阿爾茨海默病;紋理分析;形態(tài)學(xué)測量 
分類號:
出版年·卷·期(頁碼):2011·30·3(243-248)
摘要:

目的 比較MR圖像紋理分析和形態(tài)學(xué)測量方法在鑒別阿爾茨海默病(Alzheimer’s disease,AD)患者的實際效果,探討紋理分析技術(shù)對AD早期診斷的價值。方法 提取29例AD患者和19例健康對照者(NC)的海馬紋理參數(shù),并測量內(nèi)側(cè)顳葉最窄寬度和海馬結(jié)構(gòu)體積等形態(tài)學(xué)指標(biāo),在t檢驗基礎(chǔ)上對紋理參數(shù)與形態(tài)學(xué)指標(biāo)進(jìn)行判別分析,然后采用Kappa參數(shù)值評價上述兩種方法的一致性。結(jié)果 AD組與NC組間的和均值、能量等紋理參數(shù)均顯著不同,右側(cè)海馬和均值與形態(tài)學(xué)測量指標(biāo)內(nèi)側(cè)顳葉最窄寬度的判別準(zhǔn)確度均為97.9%。經(jīng)多元逐步判別分析,紋理參數(shù)聯(lián)合判別的準(zhǔn)確度為97.9%。紋理分析與形態(tài)學(xué)測量的Kappa值為0.957(p<0.001)。結(jié)論 MR圖像的紋理分析與形態(tài)學(xué)測量具有較好的一致性,紋理分析可能有助于AD的早期診斷。
 

Objective To evaluate the positive value of texture analysis in early diagnosis for Alzheimer’s disease (AD) by means of comparing the discriminative ability of texture analysis and morphologic measure. Methods The texture parameters of hippocampus were firstly extracted from 29 patients with AD and 19 normal controls (NC), and then the morphological indexes, such as the thinnest medial temporal lobe (tMTL), the volumes of hippocampal formation (HF) were measured. Based on t test, discriminant analyses of both texture parameters in hippocampus and morphological indexes were respectively conducted. Finally, the value of Kappa was used to evaluate the consistency between two methods.  Results The texture features such as sum average (SAV) and energy (ENG) in hippocampus were significantly different between AD and NC groups (p<0.01). The discriminations of SAV in hippocampus and the morphological indicator tMTL were both 97.9%. By a stepwise discriminant analysis, the classification accuracy of discriminant by combining texture parameters was 97.9%. With Kappa test, Kappa value between texture analysis and morphological measure was 0.957 (p<0.001). Conclusion Texture analysis of MR images is consistent well with the morphological measure. This study may be helpful in the early diagnosis of AD.

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