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阿爾茨海默病患者扣帶部位磁共振圖像紋理特征及性別特點(diǎn)

Texture features and gender characteristics of cingulum on MR images of patients with alzheimer’s disease

作者: 王旭  楊慧芳  劉衛(wèi)芳  夏翃  童隆正 
單位:首都醫(yī)科大學(xué)生物醫(yī)學(xué)工程學(xué)院(北京 100069)
關(guān)鍵詞: 阿爾茨海默病;磁共振圖像;紋理分析;扣帶;性別 
分類號(hào):
出版年·卷·期(頁碼):2012·31·1(81-86)
摘要:

目的 分析阿爾茨海默(Alzheimer’s disease,AD)、輕度認(rèn)知障礙(mild cognitive impairment,MCI)和正常對(duì)照者(normal controls,NC)MR圖像扣帶紋理特征,并按性別進(jìn)行分組分析,探索紋理特征在疾病早期診斷上的應(yīng)用。方法 利用灰度共生矩陣和游程長(zhǎng)矩陣對(duì)52例MR圖像(AD14例、MCI20例、NC18例)進(jìn)行紋理分析,測(cè)試組間參數(shù)是否顯著不同,并用支持向量機(jī)方法對(duì)在組間具有顯著性差異的紋理特征進(jìn)行分類識(shí)別。結(jié)果 與NC組相比,AD和MCI組的能量、游程長(zhǎng)不均勻度等紋理特征在前扣帶和后扣帶均存在顯著性差異。按性別分組的實(shí)驗(yàn)結(jié)果顯示,除AD組和NC組間存在顯著不同外,男性后扣帶在MCI與NC及MCI與AD間均存在顯著性差異(P<0.05),女性前扣帶在MCI和NC組間存在顯著性差異(P<0.05)。分類識(shí)別結(jié)果顯示,男性后扣帶分類正確率最高,為90%。結(jié)論 MR圖像紋理特征可以反映扣帶病理變化,不同性別MR圖像表現(xiàn)不同,有可能為AD的早期診斷提供幫助。

Objective This article studied the texture features of cingulum of patients with Alzheimer's disease(AD)and mild cognitive impairment(MCI)based on magnetic resonance images and analyzed them according to different gender. The purpose was to explore the application of texture features in early diagnosis of AD. Methods Texture analysis was applied to MR images of 14 AD,20 MCI and 18 normal controls(NC). Texture features extracted from gray level co-occurrence matrix and run-length matrix were analyzed between each two groups. The texture features that existed significant differences among groups were used as input features in a classification procedure based on support vector machines(SVM). Results Compared with NC group,texture features including energy and run length non-uniformity of AD and MCI group were significantly different on anterior and posterior cingulum. The results grouped by gender showed that except the differences between AD and NC group,male posterior cingulum showed significant differences between MCI and NC group and MCI and AD group (P<0.05),female anterior cingulum showed significant differences between MCI and NC group(P<0.05). The classification accuracy for AD and NC group of male posterior cingulum was 90%. Conclusion The results indicated that the pathological changes in cingulum could be reflected by texture features and the pathological changes may be different in the two genders. This may be helpful to early diagnosis of AD.

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