發(fā)布時(shí)間：2018-03-03 04:12

  本文選題：迭代重建　切入點(diǎn)：體層攝影術(shù)　出處：《臨床放射學(xué)雜志》2017年04期 　論文類型：期刊論文

【摘要】：目的評(píng)價(jià)混合迭代重建算法混合權(quán)重對(duì)肺CT量化分析結(jié)果的影響,包括圖像噪聲、肺實(shí)質(zhì)及氣道量化指標(biāo)、肺結(jié)節(jié)體積等。方法 52例肺CT掃描原始數(shù)據(jù)分別利用濾波反投影(FBP)、ASIR-V30%、ASIR-V50%、ASIR-V70%、ASIR-V100%算法重建。測(cè)量肺氣腫指數(shù)、全肺容積、右肺上葉尖段支氣管氣道腔面積、氣道壁面積、氣道壁面積百分比、氣道壁平均厚度、氣道平均直徑、氣管分叉層面氣道內(nèi)空氣及降主動(dòng)脈血液CT平均值、標(biāo)準(zhǔn)差。測(cè)量54枚肺結(jié)節(jié)實(shí)性及非實(shí)性體積。比較不同迭代混合權(quán)重對(duì)上述測(cè)量結(jié)果的影響。結(jié)果隨著ASIR-V比例的提高(FBP,ASIR-V30%,ASIR-V50%,ASIR-V70%,ASIR-V100%),肺氣腫指數(shù)逐漸降低(分別為3.34%、2.13%、1.46%、0.98%、0.57%),圖像噪聲逐漸降低(空氣CT值標(biāo)準(zhǔn)差:29.8 HU,25.5 HU,22.6 HU,19.6 HU,15.2 HU;降主動(dòng)脈CT值標(biāo)準(zhǔn)差:35.2 HU,27.6 HU,22.7 HU,18.0 HU,12.1 HU)(P0.01),其他量化結(jié)果影響無(wú)統(tǒng)計(jì)學(xué)意義。結(jié)論混合迭代重建混合權(quán)重影響肺CT圖像噪聲水平及肺氣腫指數(shù),對(duì)肺實(shí)質(zhì)、氣道指標(biāo)、肺結(jié)節(jié)體積影響無(wú)統(tǒng)計(jì)學(xué)意義。
[Abstract]:Objective to evaluate the effect of mixed weight of mixed iterative reconstruction algorithm on lung CT quantitative analysis, including image noise, lung parenchyma and airway quantification. Methods the original data of 52 cases of lung CT scanning were reconstructed by the ASIR-V30, ASIR-V50 and ASIR-V70, respectively. The emphysema index, the whole lung volume, the airway area of the upper apical segment of the right lung, the area of the airway wall, the area of the bronchial wall of the upper lobe of the right lung were measured. Percentage of airway wall area, mean thickness of airway wall, mean diameter of airway, CT mean value of airway air and descending aorta blood at trachea bifurcation level. Standard deviation. 54 lung nodules solid and non-solid volumes were measured. The effects of different iterative mixing weights on the above results were compared. Results with the increase of ASIR-V ratio, ASIR-V50 and ASIR-V100, emphysema index gradually decreased (3.342.131.131.460.98) and 0.57%, image noise. The standard deviation of CT value of descending aorta was: 29.8 HU25.5 HU22.6 HU19.6 HU15.2 HU15.2; the standard deviation of descending aorta CT value was 35.2 HU27.6 HU27.6 HU27.6 HU12.1 HU12.1 HUP 0.01, other quantitative results had no statistical significance. Conclusion mixed iterative reconstruction mixing weight has influence on lung CT image noise level and pulmonary emphysema index. There was no significant difference in pulmonary parenchyma, airway index and pulmonary nodule volume.
【作者單位】： 北京大學(xué)人民醫(yī)院放射科;
【分類號(hào)】：R816.41

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