【摘要】：目的:常規(guī)CT圖像中金屬植入物會引起偽影,對局部結構組織的判斷有嚴重影響,使CT圖像的解讀能力下降,難以達到臨床醫(yī)療診斷的目的。因此,需要有效的方法從圖像域或投影域進行校正。方法:通過對金屬植入物術后常規(guī)混合能量與最佳單能量成像上的圖像質量及參數(shù)比較,聯(lián)合能譜CT金屬偽影去除系統(tǒng)(MARs)重建技術的綜合運用,探討寶石能譜CT掃描技術在去金屬偽影方面的獨到優(yōu)勢和臨床應用的價值。結果:重組圖像時,所有常規(guī)混合能量圖像均有明顯的金屬偽影。經能譜CT的MARs重建后偽影明顯減少。金屬植入物后QC組、mono+MRAs組偽影最重層面的CT均值(HU)、SD均值比較均有統(tǒng)計學差異(P0.05)。而且在mono+MRAs組,當單能量在90~140 kev時,偽影最重層面的CT均值(HU)、SD均值及偽影指數(shù)AI的變化曲線趨于穩(wěn)定。結論:寶石能譜CT去金屬偽影的重建技術選擇單能量在90~140 kev之間,可大大減少金屬植入物造成的偽影,在臨床診斷及疾病隨訪方面具有較大應用價值。
[Abstract]:Objective: metal implants in conventional CT images can cause artifacts, which have a serious impact on the judgment of local structure and tissue, so that the interpretation ability of CT images is decreased, and it is difficult to achieve the purpose of clinical medical diagnosis. Therefore, an effective method is needed for correction from image domain or projection domain. Methods: by comparing the image quality and parameters of conventional mixed energy and optimal single energy imaging after metal implants, the combined energy spectrum CT metal artifact removal system (MARs) reconstruction technique was used. To explore the unique advantages and clinical application value of gem energy spectrum CT scanning technique in demetallization artifact. Results: metal artifacts were observed in all conventional mixed energy images. The artifacts were significantly reduced after MARs reconstruction by energy dispersive CT. Moreover, in the mono MRAs group, when the single energy was 90 ~ 140 kev, the curve of (HU) mean (HU) SD mean and artifact index AI in the gravest plane of the artifact tended to be stable. Conclusion: the reconstruction technique of gem energy spectrum CT for removing metal artifacts can greatly reduce the artifacts caused by metal implants by selecting a single energy range of 90 ~ 140 kev, and has great application value in clinical diagnosis and disease follow-up.
【作者單位】： 寧夏醫(yī)科大學;寧夏醫(yī)科大學總醫(yī)院心腦血管病醫(yī)院;寧夏醫(yī)科大學總醫(yī)院;
【基金】：寧夏回族自治區(qū)科技攻關項目
【分類號】：R814

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