本文選題：體層攝影術 + X線計算機��； 參考：《放射學實踐》2017年07期

【摘要】：目的:探討雙能量CT增強掃描在肺部血管容積再現(VR)中的價值。方法:40例患者行胸部雙源CT雙能量增強掃描,把監(jiān)測點設置在上腔靜脈,分別獲得80kV(組1)、140kV(組2)、M=0.6(組3)、最佳單能量(組4)和非線性融合(組5)圖像。由兩位影像科醫(yī)師分別測量肺動脈干、左下肺動脈與左上肺靜脈CT值并計算平均值,計算肺動脈干信噪比(SNR)、對比噪聲比(CNR)、左下肺動脈與左上肺靜脈CT值差值,使用單因素方差檢驗比較上述各指標在各組間的差異,獲得最佳質量組圖像并行VR重組,規(guī)定肺動脈為紅色,肺靜脈為藍色,由兩位影像科醫(yī)師共同評價VR圖像質量并取得一致意見,根據肺動靜脈顏色差異把VR圖像分成優(yōu)、良和差三個等級,探討VR圖像的優(yōu)缺點并分析其原因。結果:5組圖像的SNR和CNR總體有顯著差異(分別為F=25.049,P0.001;F=24.882,P0.001),組5具有最高的SNR、CNR,與其他各組差異均有統(tǒng)計學意義(均為P0.05)),5組肺動靜脈CT值差值總體有顯著差異(F=21.120,P0.001),組5肺動靜脈CT值差值最高,與組1差異無統(tǒng)計學意義(P0.05),與其它3組差異具有統(tǒng)計學意義(P0.05)。采用非線性融合數據行VR重組,32例VR圖像評為優(yōu),6例評為良,2例因呼吸運動導致監(jiān)測點移位病例VR圖像評為差。結論:雙能量CT非線性融合圖像具有很高的SNR、CNR,且肺動靜脈CT值差值最大,VR重組時增加了肺動靜脈色差,有利于肺段血管的精確定位。
[Abstract]:Objective: to evaluate the value of dual-energy CT enhanced scan in pulmonary vascular volume reconstruction (VRV). Methods Twenty patients were examined by dual-source CT dual-energy enhanced chest CT. The monitoring points were set at the superior vena cava. The images of 80 kV (group 1: 140 kV) (group 2) (group 3), best single energy (group 4) and nonlinear fusion (group 5) were obtained. The CT values of the pulmonary trunk, the left inferior pulmonary artery and the left superior pulmonary vein were measured by two imaging physicians. The SNR of the pulmonary trunk was calculated and the SNR was calculated. The contrast noise ratio (CNRN), the difference between the left inferior pulmonary artery and the left superior pulmonary vein, and the difference between the left inferior pulmonary artery and the left superior pulmonary vein were calculated. Univariate variance test was used to compare the differences of the above indexes in each group. The best quality group was obtained by VR recombination. The pulmonary artery was red and the pulmonary vein was blue. The quality of VR images was evaluated by two imaging physicians and the consensus was reached. According to the color differences of pulmonary arteriovenous images, VR images were divided into three grades: excellent, good and bad. The advantages and disadvantages of VR images were discussed and the causes were analyzed. Results there were significant differences in SNR and CNR between the two groups (F _ (25.049) P _ (0.001) P _ (0.001) and group 5 (n = 5) respectively. Group 5 had the highest value of SNR, which was significantly different from that of other groups (P < 0.05). There was significant difference in CT value of pulmonary arteriovenous between the two groups (P < 0.01) and the pulmonary arteriovenous CT value of group 5 was significantly different from that of the other groups (P < 0.05). The difference of CT value of pulmonary arteriovenous between group 5 and group 5 was significantly different from that of other groups (P < 0.05). The difference of CT value of pulse was the highest, There was no significant difference between group 1 and group 1 (P 0.05), but there was significant difference between group 1 and group 1 (P 0.05). Using nonlinear fusion data, 32 cases of VR images were evaluated as excellent, 6 cases as good ones, 2 cases as cases of displacement of monitoring points due to respiratory movement, and 3 cases of VR images were evaluated as poor. Conclusion: the nonlinear fusion images of dual energy CT have high SNR CNR, and the maximum difference in CT value of pulmonary arteriovenous CT increases the color difference of pulmonary arteriovenous, which is beneficial to the accurate location of pulmonary vessels.
【作者單位】： 解放軍八一醫(yī)院醫(yī)學影像科;
【基金】：南京軍區(qū)醫(yī)學科技創(chuàng)新經費資助重點項目(15ZD019)
【分類號】：R816.41

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