【摘要】：目的探討低劑量掃描聯(lián)合迭代模型重建技術(shù)在胸部CT雙期增強(qiáng)檢查中的可行性。方法 130例擬診為肺部占位的患者接受胸部雙期增強(qiáng)掃描,隨機(jī)分為A組和B組,每組65例。A組掃描采用管電壓100kV,自動(dòng)管電流調(diào)制技術(shù),圖像質(zhì)量指數(shù)10;B組管電壓80kV,自動(dòng)管電流調(diào)制技術(shù),圖像質(zhì)量指數(shù)8。A組圖像采用混合迭代重建技術(shù)(iDose~4)重建,B組圖像采用迭代模型重建技術(shù)(IMR)重建。比較兩組圖像肺動(dòng)脈(PA)期及支氣管動(dòng)脈(BA)期的客觀圖像質(zhì)量、主觀圖像質(zhì)量和血管顯示優(yōu)良率并計(jì)算輻射劑量。結(jié)果 A組有效輻射劑量為(3.30±0.89)mSv,B組為(1.27±0.19)mSv,B組較A組下降61.52%(P0.001)。PA期和BA期,B組圖像噪聲顯著低于A組,CNR顯著高于A組(P均0.001);兩組肺窗和縱隔窗主觀圖像質(zhì)量均達(dá)到較高評(píng)分,雙期血管顯示優(yōu)良率均較高,差異無統(tǒng)計(jì)學(xué)意義(P均0.05)。結(jié)論采用迭代模型重建技術(shù),低劑量胸部雙期增強(qiáng)掃描可在較常規(guī)劑量降低61.52%的條件下,保證圖像質(zhì)量并滿足診斷要求。
[Abstract]:Objective To study the feasibility of low-dose scanning combined iterative model reconstruction technique in the double-stage enhancement of chest CT. Methods 130 patients who were to be diagnosed as lung occupying were randomly divided into group A and group B, with 65 cases in each group. A group of images with a tube voltage of 100 kV, an automatic tube current modulation technique, an image quality index of 10, a B-group tube voltage of 80 kV, an automatic tube current modulation technique, an image quality index 8.A group image is reconstructed by a hybrid iterative reconstruction technique (iDse-4), The B-group image is reconstructed using an iterative model reconstruction technique (IMR). Objective To compare the objective image quality, subjective image quality and blood vessel display rate of the two groups of image pulmonary artery (PA) and bronchial artery (BA), and to calculate the radiation dose. Results The effective radiation dose of group A was (3.30-0.89) mSv, group B (1.27-0.19) mSv, group B decreased by 61.52% (P 0.001). The image noise in group B and group B was significantly lower than that in group A (P <0.001), and the subjective image quality of both groups of lung and mediastinum was higher. The rate of good and good rate of two-stage blood vessels was higher and the difference was not significant (P <0.05). Conclusion Using the iterative model reconstruction technique, the low-dose chest two-stage enhanced scan can ensure the image quality and meet the diagnostic requirements under the condition that the conventional dose is reduced by 61.52%.
【作者單位】： 南京醫(yī)科大學(xué)附屬蘇州醫(yī)院影像科;飛利浦醫(yī)療保健臨床科研部;
【分類號(hào)】：R816.41
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本文編號(hào)：2503405