• 四川大學華西醫(yī)院放射科(四川成都 610041 );

目的 ?探討雙源CT上腹部增強掃描中低劑量技術(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上腹部增強檢查的連續(xù)600例患者,按就診時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。測量、計算并評估各組患者動脈期和門脈期圖像的皮下脂肪標準差(SD)值、肝臟和胰腺信噪比(SNR)、肝臟-豎脊肌和胰腺-豎脊肌對比噪聲比(CNR)、圖像主觀質(zhì)量評分以及射線劑量指標CT劑量指數(shù)(CTDI)、劑量長度乘積(DLP)、有效劑量(ED)。
結(jié)果 ?各組患者動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)量評分和射線劑量指標CTDI、DLP、ED之間差異均有統(tǒng)計學意義(P<0.05);各組肝臟-豎脊肌和胰腺-豎脊肌CNR之間差異無統(tǒng)計學意義(P>0.05)。其中165?mAs管電流量組圖像SNR、射線劑量和主觀質(zhì)量評分均為最低,不能滿足診斷需求。
結(jié)論 ?上腹部增強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,李沉鮫,廖凱,宋彬,黃子星. 雙源CT 低劑量掃描在上腹部增強檢查中的應(yīng)用. 中國普外基礎(chǔ)與臨床雜志, 2012, 19(5): 556-561. doi: 復(fù)制

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  5. 5. Frush DP, Applegate K. Computed tomography and radiation:understanding the issues [J]. J Am Coll Radiol, 2004, 1(2):113-119.
  6. 6. Obesity:preventing and managing the global epidemic. Report of a WHO consultation [J]. World Health Organ Tech Rep Ser,2000, 894:i-xii, 1-253.
  7. 7. 陳春明, 孔靈芝. 中國成人超重與肥胖癥預(yù)防控制指南 [M].北京:人民衛(wèi)生出版社,2006:3.
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