【摘要】：目的探討第3代雙源CT低管電壓70 kV聯(lián)合高級模擬迭代重建技術(shù)(ADMIRE)在降低結(jié)腸CT輻射劑量方面的可行性。方法前瞻性連續(xù)入組53例患者行結(jié)腸CT檢查,仰臥位為120 kV標(biāo)準(zhǔn)低劑量掃描,采用濾波反投影法進(jìn)行圖像重建;俯臥位為70 kV掃描,然后采用ADMIRE進(jìn)行圖像重建,掃描范圍一致;比較兩者輻射劑量、圖像質(zhì)量等方面的差異。結(jié)果 70 kV的CT容積劑量指數(shù)、劑量長度乘積和有效劑量分別為(1.47±0.23)m Gy、(68.85±13.82)m Gy·cm和(1.03±0.21)m Sv,明顯低于120 kV的(2.96±0.61)m Gy(t=25.356,P=0.000)、(136.97±32.77)m Gy·cm(t=22.246,P=0.000)和(2.05±0.49)m Sv(t=22.293,P=0.000)。70 kV聯(lián)合ADMIRE的信噪比為3.60±0.58,明顯高于120 kV的2.34±0.47(t=-18.036,P=0.000);噪聲為(11.81±1.93)HU,明顯低于120 kV的(14.39±2.57)HU(t=7.856,P=0.000)。兩位放射科醫(yī)師主觀評分總體κ值為0.843(P=0.000)。二維圖像結(jié)果顯示,70 kV聯(lián)合ADMIRE的噪聲明顯低于120 kV(Z=325.000,P=0.000)、圖像總體質(zhì)量評分明顯高于120 kV(Z=78.000,P=0.001),兩者的銳利度差異無統(tǒng)計學(xué)意義(Z=12.000,P=0.180),所有評分均為4~5分。三維虛擬內(nèi)鏡圖像結(jié)果顯示,70 kV聯(lián)合ADMIRE和120 kV在圖像總體質(zhì)量方面差異無統(tǒng)計學(xué)意義(Z=4.000,P=0.059),所有評分均在4~5分。結(jié)論第3代雙源CT低管電壓70 kV聯(lián)合ADMIRE較120 kV常規(guī)掃描,可在保證結(jié)腸CT圖像質(zhì)量的同時,顯著降低輻射劑量。
[Abstract]:Objective to investigate the feasibility of the third generation dual-source CT low tube voltage 70 kV combined with advanced simulated iterative reconstruction (ADMIRE) in reducing the radiation dose of colon CT. Methods Colon CT scan was performed in 53 consecutive prospective patients, with 120 kV standard low dose scan in supine position, 70 kV scan in prone position and 70 kV scan in prone position. The difference of radiation dose, image quality and so on was compared. 緇撴灉 70 kV鐨凜T瀹圭Н鍓傞噺鎸囨暟,鍓傞噺闀垮害涔樼Н鍜屾湁鏁堝墏閲忓垎鍒負(fù)(1.47鹵0.23)m Gy,(68.85鹵13.82)m Gy路cm鍜，

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