【摘要】：目的探討低濃度對比劑低管電壓在過輕或適中體重患者腹部CT增強掃描中應用的可行性,尋找減少腹部CT增強掃描射線劑量及碘攝取量的最優(yōu)方案。資料與方法選取體重指數(shù)(BMI)20 kg/m2的40例過輕患者,隨機分為A1組和B1組,每組20例;同時選取20 kg/m2≤BMI25 kg/m2的40例適中體重患者,隨機分為A2組和B2組,每組20例。A1組和A2組采用低濃度對比劑低管電壓(威視派克270mg I/ml,管電壓100 k V)行腹部CT增強掃描,B1組和B2組采用常規(guī)掃描方案(歐乃派克300 mg I/ml,管電壓120 k V)行腹部CT增強掃描。比較4組的對比噪聲比(CNR)、圖像質量評分和有效射線劑量(ED)。結果 A1組和B1組、A2組和B2組動脈期、門靜脈期的CNR及圖像質量評分比較差異均無統(tǒng)計學意義(t=-1.539~0.000,P0.05);B1組動脈期CNR及圖像質量評分明顯高于A2組和B2組,差異均有統(tǒng)計學意義(P0.05)。結論低濃度對比劑低管電壓掃描方案可以在降低碘攝取量及輻射的同時獲得與常規(guī)增強掃描同等的腹部圖像質量;BMI對肝臟動脈期圖像質量影響較大,對門靜脈期圖像質量影響較小,可考慮在肝臟增強檢查協(xié)議中選擇性降低門靜脈期電壓以降低輻射。
[Abstract]:Objective to explore the feasibility of using low concentration contrast agent and low tube voltage in abdominal CT enhanced scanning in patients with light or moderate body weight, and to find the best scheme to reduce the dose and iodine intake of abdominal CT enhanced scanning. Materials and methods 40 underweight patients with body mass index (BMI) 20 kg/m2 were randomly divided into A1 group and B1 group with 20 cases in each group. At the same time, 40 moderate weight patients with 20 kg/m2 鈮，

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