發(fā)布時間：2018-06-04 01:45

  本文選題：肝臟 + 體層攝影術(shù)　； 參考：《中國醫(yī)學(xué)影像技術(shù)》2017年11期

【摘要】：目的探討全模型迭代重建(IMR)技術(shù)不同參數(shù)設(shè)置對肝臟低劑量增強(qiáng)CT掃描圖像質(zhì)量的影響。方法收集需要接受肝臟增強(qiáng)CT檢查的患者40例,分別行上腹部平掃和3期動態(tài)增強(qiáng)掃描,其中延遲期采用低劑量掃描,管電壓80kV,管電流150mAs。對原始數(shù)據(jù)進(jìn)行濾波反投射(FBP)重建和IMR技術(shù)重建,IMR采用不同參數(shù),以獲得不同水平(Level 1~3)的常規(guī)和軟組織重建圖像,分別記為R1、R2、R3亞組和S1、S2、S3亞組。對各組圖像進(jìn)行主觀和客觀評價并比較,主觀評價包括低對比分辨率(LCD)、圖像失真(ID)和診斷信心(DC)評分,客觀評價包括肝臟噪聲、信噪比(SNR)和對比噪聲比(CNR)。結(jié)果不同參數(shù)組圖像的LCD、ID和DC評分差異均有統(tǒng)計學(xué)意義(P均0.01)。不同參數(shù)組圖像間噪聲、SNR及CNR差異均有統(tǒng)計學(xué)意義(P均0.01);除S1與R2亞組、S2與R3亞組3項指標(biāo)(P均0.05)外,余兩兩比較差異均有統(tǒng)計學(xué)意義(P均0.01)。結(jié)論全迭代重建IMR技術(shù)可提高肝臟低劑量增強(qiáng)CT掃描的圖像質(zhì)量,推薦參數(shù)為軟組織重建、Level 1或常規(guī)重建、Level 2。
[Abstract]:Objective to investigate the effect of different parameters on the quality of liver low dose enhanced CT scanning with full model iterative reconstruction (IMR) technique. Methods A total of 40 patients who needed to be examined with enhanced liver CT were examined by plain upper abdominal scan and 3 phase dynamic enhanced scan respectively. The delayed phase was performed with low dose scan, the tube voltage was 80 kV, and the tube current was 150 mAs. The conventional and soft tissue reconstruction images of the original data were obtained by using different parameters to obtain the normal and soft tissue reconstruction images of different levels of level 1 ~ (3), respectively, which were recorded as the R1 ~ (2 +) R _ (2) subgroup and S _ (1) S _ (2) S _ (3) subgroup respectively. The subjective and objective evaluation of each group included low contrast resolution (LCD), image distortion (IDD) and diagnostic confidence (DC) score. Objective evaluation included liver noise, SNR (SNR) and contrast noise ratio (CNRR). Results there were significant differences in LCDID and DC scores between different parameter groups (P < 0.01). There were significant differences in CNR and SNR between different parameter groups (P < 0.01), except for S _ 1 and R _ 2 subgroup S _ 2 and R _ 3 subgroup (P 0.05), there were significant differences between the other two groups (P < 0.01). Conclusion Total iterative reconstruction IMR technique can improve the image quality of liver low-dose enhanced CT scan. The recommended parameters are soft tissue reconstruction level 1 or conventional reconstruction level 2.
【作者單位】： 第二軍醫(yī)大學(xué)長征醫(yī)院影像科;
【分類號】：R575;R816.5

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1 王鳳;雙源CT雙能量虛擬平掃在上腹部不同掃描時期的應(yīng)用研究[D];遵義醫(yī)學(xué)院;2015年

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本文編號：1975273