發(fā)布時間：2018-04-27 05:34

  本文選題：體層攝影術(shù) + X線計算機��； 參考：《放射學(xué)實踐》2017年04期

【摘要】：目的:探討在腹部低劑量CT掃描中使用寶石能譜單能量成像(GSI)結(jié)合自適應(yīng)統(tǒng)計迭代重建技術(shù)的成像質(zhì)量。方法:90例患者使用GE Discovery CT750HD 64排CT機行腹部CT平掃及雙期增強掃描。實驗組A(30例)采用GSI技術(shù)(60keV+ASIR 50%)+對比劑碘劑量450mg I/kg;實驗組B(30例)采用常規(guī)掃描(120kVp)+對比劑碘劑量300mg I/kg;對照組(30例)行常規(guī)掃描(120kVp)+對比劑碘劑量450mg I/kg。每組均測量腹部大血管(動脈期/靜脈期)、臟器和肌肉(三期)共26個ROI的CT值并計算相應(yīng)的SNR,使用5分法(Likert分級)對各部位的圖像質(zhì)量進(jìn)行主觀評價。結(jié)果:三組患者的年齡、身高、體重及身體質(zhì)量指數(shù)(BMI)間的差異均無統(tǒng)計學(xué)意義(P0.05)。A組中26個ROI的CT值均高于對照組,除平掃和動脈期肝臟CT值和平掃肌肉CT值外,其它23個ROI的CT值在兩組間的差異均有統(tǒng)計學(xué)意義(P0.05)。B組各ROI的CT值均低于對照組,但差異無統(tǒng)計學(xué)意義(P0.05)。A組中(除SMA外)各ROI的SNR均高于對照組,僅門脈左支、動脈期肝和脾、平掃和靜脈期胰腺的SNR在兩組間的差異無統(tǒng)計學(xué)意義(P0.05)。B組的SNR均低于對照組,但差異無統(tǒng)計學(xué)意義(P0.05)。主觀評價方面,三組間圖像質(zhì)量評分的差異無統(tǒng)計學(xué)意義(P0.05)。A組與對照組間輻射劑量的差異有統(tǒng)計學(xué)意義(P0.001);B組對比劑劑量與對照組間的差異有統(tǒng)計學(xué)意義(P0.001)。結(jié)論:在能譜CT成像結(jié)合ASIR技術(shù)的幫助下,使用低管電壓能得到較好的腹部CT圖像質(zhì)量。
[Abstract]:Objective: to investigate the imaging quality of gemstone energy spectrum single energy imaging (GSI) combined with adaptive statistical iterative reconstruction in abdominal low dose CT scanning. Methods 90 patients were examined with GE Discovery CT750HD 64 slice CT and dual phase enhanced CT scan. The experimental group (30 cases) were treated with GSI (60 Kev ASIR 50) iodine dose (450mg I / kg); the experimental group (n = 30) with routine scanning method (n = 30) with 300mg I / kg; the control group (n = 30) with routine scan (n = 30); the control group (n = 30); with routine scanning (n = 120 KVp); with iodine dose of 450mg / KG (n = 30). In each group, the CT values of 26 ROI of abdominal great vessels (arterial / venous phase, viscera and muscle (phase 3) were measured and the corresponding ROI were calculated. The image quality of each site was evaluated by 5 points method. Results: there was no significant difference in age, height, weight and BMI between the three groups. The CT values of 26 ROI in group A were higher than those in control group. The CT values of the other 23 ROI were significantly different between the two groups. The CT values of each ROI in group B were lower than those in the control group, but the SNR of each ROI in group A (except SMA) was higher than that in group A, only left portal vein, liver and spleen in arterial phase. There was no significant difference in SNR between the two groups in plain scan and venous phase. The SNR of group B was lower than that of control group, but there was no significant difference between group B and group B (P 0.05). In subjective evaluation, there was no significant difference in image quality score among the three groups. There was significant difference in radiation dose between group A and control group. There was significant difference in dose of contrast agent between group P0.001 and control group (P 0.001). Conclusion: with the help of energy dispersive CT imaging and ASIR technique, better abdominal CT image quality can be obtained by using low tube voltage.
【作者單位】： 國家癌癥中心/中國醫(yī)學(xué)科學(xué)院北京協(xié)和醫(yī)學(xué)院腫瘤醫(yī)院影像診斷科;
【基金】：北京協(xié)和醫(yī)學(xué)院2015年研究生創(chuàng)新基金(2015-1002-01-26)
【分類號】：R816.5
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本文編號：1809433