本文選題：肝臟 + 輻射劑量�。� 參考：《放射學實踐》2015年10期

【摘要】：目的:探討雙源CT使用低管電壓(100kVp)和低濃度等滲對比劑(270mg I/mL)進行肝臟增強掃描的可行性。方法:將我院108例行肝臟CT增強掃描的患者隨機分成兩組,每組54例。A組:管電壓100kVp,對比劑為威視派克(270mg I/mL)。B組:管電壓120kVp,對比劑為碘克沙醇(320mg I/mL)。測量、計算兩組圖像的對比噪聲比(CNR)、信噪比(SNR)、肝實質(zhì)CT值、肝動脈CT值、門靜脈CT值及有效輻射劑量(ED),并對兩組圖像進行主觀評分,對兩組間上述指標進行統(tǒng)計學分析。結(jié)果:A組的CNR高于B組,且差異具有統(tǒng)計學意義(t=2.88,P0.05),SNR高于B組(P0.05),A組能夠提供清晰的診斷圖像,提高病變的顯示;A、B組的圖像質(zhì)量評分差異無統(tǒng)計學意義(t=-0.58,P0.05);A、B組的肝實質(zhì)CT值及肝動脈CT值均無統(tǒng)計學差異(t=-1.81,P0.05;t=0.96,P0.05),而A組的門靜脈CT值高于B組(t=7.55,P0.05);A組的三期總輻射劑量[(8.04±1.12)mSv]低于B組[(11.62±2.41)mSv](t=9.94,P0.001)。結(jié)論:雙源CT肝臟增強掃描采用管電壓100kVp和低濃度等滲對比劑(270mg I/mL)可以提供較好的圖像CNR,提高門靜脈CT值,保證診斷圖像質(zhì)量的同時降低輻射劑量。
[Abstract]:Objective: to investigate the feasibility of dual-source CT with low-tube voltage 100 kVp) and low-concentration isoosmotic contrast agent 270mg I / mL for enhanced liver scanning. Methods: one hundred and eight patients with hepatic CT enhanced scanning in our hospital were randomly divided into two groups: 54 cases in each group. Group A: tube voltage 100kVp.The contrast agent was visipex 270mg I/mL).B group: tube voltage 120kVp.The contrast agent was iodoxadol (320mg I / mL). The contrast noise ratio, SNR, CT value of hepatic parenchyma, CT value of hepatic artery, CT value of portal vein and effective radiation dose were measured and calculated. Results the CNR of group A was higher than that of group B, and the difference was statistically significant. There was no significant difference in CT value of hepatic parenchyma and hepatic artery between two groups. The CT value of hepatic parenchyma and hepatic artery in group A were not significantly different. The CT value of portal vein in group A was higher than that in group B (7.55% P 0.05). The total radiation dose in group A [8.04 鹵1.12)mSv] was lower than that in group B [11.62 鹵2.41)mSv] t9.94g P 0.001. Conclusion: Dual-source CT enhanced liver scanning using tube voltage 100kVp and low concentration isoosmotic contrast agent (270mg I / mL) can provide better image CNRs, improve the CT value of portal vein, ensure the quality of diagnostic image and reduce the radiation dose.
【作者單位】： 大連醫(yī)科大學附屬中心醫(yī)院放射線科;
【分類號】：R575;R816.5

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