目的 ?探討雙源CT上腹部增強(qiáng)掃描中低劑量技術(shù)的應(yīng)用。
方法 ?搜集2011年7月至2012年2月期間來我院行雙源CT上腹部增強(qiáng)檢查的連續(xù)600例患者,按就診時(shí)間先后分別依次采用常規(guī)管電流量(210?mAs)和低管電流量(200、190、180、170及165?mAs)掃描,分別為常規(guī)管電流量組和低管電流量組。測(cè)量、計(jì)算并評(píng)估各組患者動(dòng)脈期和門脈期圖像的皮下脂肪標(biāo)準(zhǔn)差(SD)值、肝臟和胰腺信噪比(SNR)、肝臟-豎脊肌和胰腺-豎脊肌對(duì)比噪聲比(CNR)、圖像主觀質(zhì)量評(píng)分以及射線劑量指標(biāo)CT劑量指數(shù)(CTDI)、劑量長(zhǎng)度乘積(DLP)、有效劑量(ED)。
結(jié)果 ?各組患者動(dòng)脈期和門脈期圖像的皮下脂肪SD值、肝臟和胰腺SNR、圖像主觀質(zhì)量評(píng)分和射線劑量指標(biāo)CTDI、DLP、ED之間差異均有統(tǒng)計(jì)學(xué)意義(P<0.05);各組肝臟-豎脊肌和胰腺-豎脊肌CNR之間差異無統(tǒng)計(jì)學(xué)意義(P>0.05)。其中165?mAs管電流量組圖像SNR、射線劑量和主觀質(zhì)量評(píng)分均為最低,不能滿足診斷需求。
結(jié)論 ?上腹部增強(qiáng)CT檢查,通過階段性降低管電流量使診斷醫(yī)生逐漸適應(yīng)低劑量圖像質(zhì)量,從而普及現(xiàn)有設(shè)備的低劑量掃描的方法是可行的。雙源CT采用170?mAs的參考管電流量,既能獲得滿足臨床診斷的合格圖像,又能大大降低患者群體接受的輻射劑量。
引用本文: 袁元,李真林,楊行,梁峻強(qiáng),李沉鮫,廖凱,宋彬,黃子星. 雙源CT 低劑量掃描在上腹部增強(qiáng)檢查中的應(yīng)用. 中國(guó)普外基礎(chǔ)與臨床雜志, 2012, 19(5): 556-561. doi: 復(fù)制
版權(quán)信息: ?四川大學(xué)華西醫(yī)院華西期刊社《中國(guó)普外基礎(chǔ)與臨床雜志》版權(quán)所有,未經(jīng)授權(quán)不得轉(zhuǎn)載、改編
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