智能最佳kV技术联合SAFIRE迭代重建在体检人群胸部CT检查中的图像质量评估  

Image quality evaluation of CARE kV technique combined with iterative reconstruction in chest CT scanning for physical examination

作　　者：杨斌[1] 赵卫[1] 雷静[1] 柯腾飞 李青青[1] 杨亚英[1] 

机构地区：[1]昆明医科大学第一附属医院医学影像科,云南昆明650032

出　　处：《实用放射学杂志》2014年第1期138-142,共5页Journal of Practical Radiology

摘　　要：目的探讨智能最佳kV技术联合SAFIRE迭代重建在体检人群胸部CT检查中的图像质量评估。方法随机选取体检人群胸部CT扫描130例，设置质量参考毫安为80mAs，将患者分为2组并设置2组扫描方案，患者随机使用这2组方案中的一组。实验组：60例采用100kV，开启智能最佳kV扫描技术，并采用SAFIRE（值为3）技术进行重建。对照组：70例采用常规120kV扫描。测量比较2组患者肺尖层面右侧胸大肌、气管分叉层面降主动脉、左心房中部的平均CT值、噪声（SD）、信噪比（SNR）与对比噪声比（CNR）；由2名医师采用5分制对图像质量进行评价，并将结果进行比较；记录比较2组容积CT剂量指数（CTDIv01）、剂量长度乘积（DLP）及有效剂量（ED）。结果2组图像质量均能完全满足临床诊断需求，观察者间具有较好一致性（Kappa=0．786），实验组与对照组肺尖部右侧胸大肌、气管分叉层面降主动脉、左房中部水平的平均CT值分别为（40．80±6．23）HU、（40．1±7．14）HU、（51．1±8．37）Hu及（41．44±7．94）HU、（38．65±9．16）Hu、（49．29±10．05）Hu，差异均无统计学意义（P均〉O．05）；图像噪声（sD）分别为6．85±1．57、9．35±2．20、14．74±6．17及7．88±1．81、11．15±2．77、15．84±3．72，差异均有统计学意义（P均〈O．001）；信噪比（SNR）分别为6．25±1．75、4．58±1．27、3．82±1．23及5．53±1．65、3．68±1．28、3．29±1．06，差异均有统计学意义（P均〈O．001）；实验组与对照组气管分叉层面降主动脉对比噪声比（cNR）分别为1．61土1．27及1．59±1．24，差异无统计学意义（P〉O．05）。实验组吲v0I为（3．29±1．17）mGy，DLP为（114．9士43．73）mGy／cm，ED为（1．61±0．61）mSv，对照组CTI^wH为（5．30±1．53）mGy，DLP为（167．6±44．59）mGy／cm，ED为（2．35±0．62）mSv，2组差异均有统计学意义Objective To investigate the Image quality evaluation of CARE kV technique combined with iterative reconstruction in chest CT scanning for physical examination. Methods 130 cases undergone chest CT scanning for physical examination were randomly chosen and set 80 mAs for quality reference value. Patients were divided into two groups,scanning scheme were set and patients were ran- domized to the scanning scheme. 60 patients underwent chest scan with 100 kV,CARE kV technique and SAFIRE （value= 3） recon- struction （experimental group）, while other 70 patients underwent chest scan with 120kV （control group）. Mean CT value, image noise { SD） and signal to noise ratio （SNR） of apex of lung,the level of the descending aorta bifurcation o{ trachea,middle area of left atrium were measured. Image quality with 5 point scale were assessed by two radiologists and results of two groups were compared. CT dose index of volume （CTDIvol） ,dose length product （DLP） and effective dose （ED） were compared. Results All of the images in both groups could satisfy diagnosis requirement. There was no statistically difference in image quality between both methods （P〉 0.05）. Mean CT value of apex of lung, the level of the descending aorta bifurcation of trachea,middle area of left atrium was no statistically significant in both group （P〉0.05） ,SD and SNR of apex of lung,the level of the descending aorta bifurcation of trachea, middle area of left atrium were statistically significant in both group （all P〈0.05 ）. CTDIvol was （3.29 ± 1. 17）mGy in low-dose group, while （ 5. 30±1.53 ） mGy in control group. DLP was（ 114.9± 43.73 ） mGy/cm in low-dose group,while （ 167.6 ± 44.59 } mGy/cm was in control group. ED was （1.61±0.61） mSv in low-dose group,while（2.35±0.62）mSv in control group （all P〈0.05 ）. Conclusion CARE kV technique combined with iterative recon- struction ia chest CT scanning for physical examination couldreduce the radiation dosage and improve CT image

关 键 词：计算机体层成像 智能最佳kV技术 迭代重建 胸部 辐射剂量 

分 类 号：R814.42[医药卫生—影像医学与核医学] R323.2[医药卫生—放射医学]