本文選題：體層攝影術(shù) + 發(fā)射型計(jì)算機(jī)��； 參考：《中國(guó)全科醫(yī)學(xué)》2017年S2期

【摘要】：目的探討迭代重建(IR)算法在顱骨掃描中對(duì)圖像質(zhì)量及輻射劑量的影響。方法選取2013年6月—2014年12月間濰坊市人民醫(yī)院腦科醫(yī)院因顱骨骨折或術(shù)后行顱骨修補(bǔ)的80例患者為研究對(duì)象,按照隨機(jī)原則分為4組,每組20例。A組采用常規(guī)濾波反投影(FBP),B~D組為低劑量組,采用IR技術(shù)逐級(jí)降低管電流,使輻射劑量分別降低50%、60%、70%,并采用自適應(yīng)性統(tǒng)計(jì)迭代重建技術(shù)(ASIR)重建;采用單因素方差分析比較各組客觀評(píng)價(jià)指標(biāo)[枕骨髁間隆起周圍最厚骨皮質(zhì)的平均值(CT值)、圖像噪聲值(SD)、信噪比(SNR)、對(duì)比噪聲比(CNR)]及輻射劑量[CT劑量指數(shù)(CTDI)、CT劑量長(zhǎng)度乘積(DLP)及有效輻射劑量(ED)]的差異;采用Kruskal-Wallis檢驗(yàn)比較各組主觀圖像質(zhì)量評(píng)分(對(duì)比度、邊緣銳利度、主觀噪聲及圖像總體質(zhì)量,采用4分法)。結(jié)果4組的CT值、SD值、SNR、CNR比較,差異無統(tǒng)計(jì)學(xué)意義(P0.05);2名放射科醫(yī)師對(duì)4組圖像的主觀評(píng)分比較,對(duì)比度、銳利度、主觀噪聲及圖像質(zhì)量的Kappa值分別為0.73、0.74、0.76、0.80,顯示一致性較好(Kappa0.75);4組顯示了良好的主觀圖像質(zhì)量,各項(xiàng)評(píng)分≥3分,差異無統(tǒng)計(jì)學(xué)意義(P0.05);4組CTDI、DLP、ED比較,差異有統(tǒng)計(jì)學(xué)意義(P0.05)。結(jié)論 IR可以降低噪聲,在掃描劑量降低70%的條件下仍可得到達(dá)到診斷要求的圖像質(zhì)量。
[Abstract]:Objective to investigate the effect of iterative reconstruction (IR) algorithm on image quality and radiation dose in skull scanning. Methods from June 2013 to December 2014, 80 patients with cranial fracture or cranioplasty in the Department of brain of Weifang people's Hospital were selected as the study objects. The patients were divided into 4 groups according to the random principle. Each group (20 cases) was treated with conventional filter backprojection (FBP) and BnD as low dose group. Ir technique was used to reduce the current of the tube step by step, and the radiation dose was reduced by 50% and 60% and 70% respectively, and the adaptive statistical iterative reconstruction (ASIR) technique was used. Single factor analysis of variance (ANOVA) was used to compare objective indexes [mean value (CT value), image noise value (SD), signal-to-noise ratio (SNR), contrast noise ratio (CNR)] and radiation dose [CT dose index (CTDI)] of the thickest bone cortex around the intercondylar eminence of occipital bone (CT value), image noise value (SD), contrast noise ratio (CNR) and radiation dose [CT dose index (CTDI)] The difference of degree product (DLP) and effective radiation dose (Ed); Kruskal-Wallis test was used to compare the subjective image quality scores (contrast, edge sharpness, subjective noise and overall image quality, 4 points method). Results there was no significant difference in the value of CT and SD between the four groups (P0.05). The subjective scores, contrast and sharpness of the images of the 4 groups were compared by 2 radiologists. The Kappa values of subjective noise and image quality were 0.73 鹵0.74 and 0.76N 0.80, respectively. The four groups showed good subjective image quality (Kappa 0.75). The scores of each score were more than 3, the difference was not statistically significant (P0.05). Conclusion IR can reduce the noise, and the image quality can be achieved even when the scanning dose is reduced by 70%.
【作者單位】： 山東省濰坊市人民醫(yī)院腦科醫(yī)院;
【分類號(hào)】：R651.1;R816.1

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