本文選題：肝臟 + 輻射劑量�。� 參考：《放射學(xué)實(shí)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(duì)比劑(270mg I/mL)進(jìn)行肝臟增強(qiáng)掃描的可行性。方法:將我院108例行肝臟CT增強(qiáng)掃描的患者隨機(jī)分成兩組,每組54例。A組:管電壓100kVp,對(duì)比劑為威視派克(270mg I/mL)。B組:管電壓120kVp,對(duì)比劑為碘克沙醇(320mg I/mL)。測(cè)量、計(jì)算兩組圖像的對(duì)比噪聲比(CNR)、信噪比(SNR)、肝實(shí)質(zhì)CT值、肝動(dòng)脈CT值、門(mén)靜脈CT值及有效輻射劑量(ED),并對(duì)兩組圖像進(jìn)行主觀(guān)評(píng)分,對(duì)兩組間上述指標(biāo)進(jìn)行統(tǒng)計(jì)學(xué)分析。結(jié)果:A組的CNR高于B組,且差異具有統(tǒng)計(jì)學(xué)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(píng)分差異無(wú)統(tǒng)計(jì)學(xué)意義(t=-0.58,P0.05);A、B組的肝實(shí)質(zhì)CT值及肝動(dòng)脈CT值均無(wú)統(tǒng)計(jì)學(xué)差異(t=-1.81,P0.05;t=0.96,P0.05),而A組的門(mén)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(qiáng)掃描采用管電壓100kVp和低濃度等滲對(duì)比劑(270mg I/mL)可以提供較好的圖像CNR,提高門(mén)靜脈CT值,保證診斷圖像質(zhì)量的同時(shí)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(xué)附屬中心醫(yī)院放射線(xiàn)科;
【分類(lèi)號(hào)】：R575;R816.5

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