發(fā)布時(shí)間：2018-01-31 20:12

  本文關(guān)鍵詞： 低劑量 容積數(shù)據(jù)高分辨率CT 肺部 體檢　出處：《海南醫(yī)學(xué)》2016年22期 　論文類型：期刊論文

【摘要】：目的探討低劑量容積數(shù)據(jù)高分辨率CT(VHRCT)應(yīng)用于肺部體檢掃描的最佳參數(shù)。方法將本院2013年10月至2015年7月500名肺部健康體檢者簡(jiǎn)單隨機(jī)化分成5組,各組100名,管電流分別為常規(guī)劑量220 m A和低劑量35 m A、30 m A、25 m A、20 m A,管電壓均為120 k V掃描,容積數(shù)據(jù)進(jìn)行薄層高分辨率算法重組,以能顯示肺小葉水平上的細(xì)微結(jié)構(gòu)和病變以及大血管的邊界為保證診斷質(zhì)量的圖像。記錄各組受檢者的照射劑量,對(duì)不同低劑量管電流和常規(guī)劑量的VHRCT圖像進(jìn)行統(tǒng)計(jì)學(xué)分析。結(jié)果 35 m A、30 m A、25 m A、20 m A低劑量與常規(guī)劑量220 m A相比,受檢者的照射劑量分別下降85.64%、87.86%、90.24%、92.53%。35 m A、30 m A、25 m A和220 m A常規(guī)劑量VHRCT圖像比較差異均無(wú)統(tǒng)計(jì)學(xué)意義(P0.05),20 m A和常規(guī)劑量比較差異有統(tǒng)計(jì)學(xué)意義(P0.05)。結(jié)論 25 m A的管電流可作為低劑量容積數(shù)據(jù)高分辨率CT應(yīng)用于肺部體檢的參考條件。
[Abstract]:Objective to investigate the high resolution CTG VHRCT with low dose volume data. Methods from October 2013 to July 2015, 500 patients were randomly divided into five groups. There were 100 patients in each group. The current of the tube was 220mA at the conventional dose and 20mA at the low dose of 35mAm (35mAL). The voltage of the tube is 120 kV, and the volume data are reconstructed by thin-layer high-resolution algorithm. Images showing fine structures and lesions at the pulmonary lobular level, as well as the boundaries of the large vessels, were used to ensure diagnostic quality. Radiation doses were recorded for each group of subjects. The VHRCT images of different low dose tube current and conventional dose were analyzed statistically. The low dose of 20mA was 85.64% lower than the conventional dose of 220mA, and 90.24% lower than that of the normal dose of 220mA. There was no significant difference in conventional VHRCT images between 30 Ma and 220mA. There was no significant difference between the two groups (P 0.05). The difference between 20mA and conventional dose was statistically significant (P0.05). Conclusion 25 Ma tube current can be used as a reference for the application of low dose volume data and high resolution CT in lung physical examination.
【作者單位】： 上海市嘉定區(qū)安亭醫(yī)院放射科;
【基金】：上海市嘉定區(qū)科委基金資助項(xiàng)目(編號(hào):2013-KW-15)
【分類號(hào)】：R734.2;R730.44
【正文快照】： 肺癌是我國(guó)城市癌癥死亡率第一位的惡性腫瘤,多數(shù)肺癌早期無(wú)明顯臨床癥狀,約75%的肺癌患者在確診時(shí)已屬晚期,5年生存率約為15.6%[1],僅有不到25%的患者適合手術(shù)治療[2]。早期發(fā)現(xiàn)無(wú)癥狀肺癌及其他肺部疾病的有效方法是對(duì)人群的肺部體檢。CT與X線胸片相比,明顯提高了肺部疾病的

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