【摘要】：目的:比較濾波反投影(Filtered back projection,FBP)與迭代算法(Sinogram-affirmed iterative reconstruction,SAFIRE)的圖像質(zhì)量及左心室功能評(píng)價(jià)的準(zhǔn)確性。材料與方法:納入我院先后3天內(nèi)行冠狀動(dòng)脈CT檢查和心臟MR檢查者82例為研究對(duì)象,分別采用FBP和SAFIRE重建系列圖像。將82例按照體質(zhì)量指數(shù)(BMI)分成A組(BMI≤24 kg/m~2,共30例)和B組(BMI24 kg/m~2,共52例),測(cè)量主動(dòng)脈根部及皮下脂肪組織CT值及標(biāo)準(zhǔn)差,計(jì)算圖像信噪比(SNR)和對(duì)比噪聲(CNR),分別比較兩個(gè)BMI組不同重建方法的圖像質(zhì)量。利用心功能分析軟件測(cè)量?jī)煞N重建圖像的左心室舒張末期容積(EDV)、收縮末期容積(ESV)、每搏輸出量(SV)和射血分?jǐn)?shù)(EF),并以MRI心功能測(cè)量結(jié)果作為金標(biāo)準(zhǔn),對(duì)比分析兩種重建方法評(píng)價(jià)左心室功能的準(zhǔn)確性。統(tǒng)計(jì)分析采用配對(duì)t檢驗(yàn)和Pearson相關(guān)分析。結(jié)果:A組和B組SAFIRE重建圖像噪聲分別下降18.98%和17.40%,SNR和CNR分別提高23.99%、32.54%和22.07%、31.73%,差異均有顯著的統(tǒng)計(jì)學(xué)意義(P0.001)。與MRI相比較,兩種重建算法測(cè)得的左心室EDV、ESV、SV和EF值均無統(tǒng)計(jì)學(xué)差異(P0.05),經(jīng)Pearson相關(guān)分析,兩種重建方法與MRI的結(jié)果均具有相關(guān)性。結(jié)論:SAFIRE重建較FBP重建可提高圖像質(zhì)量。兩組重建方法測(cè)量左心室功能與MRI均具有相關(guān)性,SAFIRE重建圖像測(cè)量結(jié)果更為準(zhǔn)確。
[Abstract]:Aim: to compare the image quality and the accuracy of left ventricular function evaluation between filtered backprojection (Filtered back projection (FBP) and Sinogram-affirmed iterative construction algorithm (SAFIRE). Materials and methods: 82 patients who underwent coronary artery CT and cardiac Mr examination within 3 days were included in the study. FBP and SAFIRE were used to reconstruct serial images respectively. According to the body mass index (BMI), 82 cases were divided into two groups: group A (BMI 鈮，

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