比较研究单源序列采集双能CT结肠成像容积和螺旋扫描模式  

Comparative study on volume and helical scan mode of single-source dual-energy CT colonography with sequential acquisitions

作　　者：梁丹[1,3] 阿布都克尤木江·阿布力孜 刘志飞 孔德灿 李文儒[3] 朱冬云[3] 戎军艳 张曦[4] Wenli Cai 罗明月[3] LIANG Dan;ABDON KEYOUMU JEAN·Abliz;LIU Zhifei;KONG Decan;LI Wenru;ZHU Dongyun;RONG Junyan;ZHANG Xi;Wenli CAI;LUO Mingyue(Department of Radiology,the First People′s Hospital of Guangzhou City,Guangzhou, Guangdong 510180,China;Department of Medical Imaging,First People′s Hospital of Kashgar, Kashgar,Xinjiang 844000,China;Department of Radiology,the Sixth Affiliated Hospital,Sun Yat-sen University,Guangzhou 510655,China;Department of Biomedical Engineering, Fourth Military Medical University of PLA,Xi′an,Sanxi 710032,China;Department of Radiology, Massachusetts General Hospital of Harvard Medical School,Massachusetts,Boston 02114,United States)

机构地区：[1]广东省广州市第一人民医院放射科,510180 [2]新疆维吾尔自治区喀什地区第一人民医院医学影像科,844000 [3]中山大学附属第六医院放射科,广州510655 [4]中国人民解放军第四军医大学生物医学工程系,西安710032 [5]哈佛大学医学院麻州总医院放射科,麻州波士顿02114

出　　处：《重庆医学》2018年第28期3625-3628,共4页Chongqing medicine

基　　金：新疆维吾尔自治区自然科学基金项目(2017D01C013)

摘　　要：目的比较单源序列采集双能CT结肠成像容积和螺旋扫描模式的扫描时间、辐射剂量和运动校正算法体配准后结直肠双能融合图像质量。方法未影响胃肠道运动功能病史的志愿者46例,接受Acquilion ONE 320排CT机容积和螺旋扫描。容积扫描:wide-volume,层厚0.5mm,球管电压135kVp/80kVp,球管电流自适应球管电压变化。螺旋扫描:螺距因子/螺距=0.085/6.8,层厚0.5 mm×80.0 mm,球管电压135kVp/80kVp,球管电流10mA/60mA。2位放射科医生盲法评价2种模式运动校正算法体配准前、后结直肠双能融合图像质量,以一致性意见为评价结果。分析2种模式扫描时间和有效辐射剂量,分析2种模式运动校正算法体配准后结直肠双能融合图像质量。结果容积、螺旋模式扫描时间分别为(12.31±2.32)s、(39.55±3.08)s,差异有统计学意义(t=47.912 4,P<0.01);有效辐射剂量分别为(4.14±1.51)mSv、(4.71±0.91)mSv,差异有统计学意义(t=2.193 0,P<0.05);运动校正算法体配准后结直肠双能融合图像质量1级分别为96.7%、62.6%,差异有统计学意义(U=8.978 6,P<0.01)。结论单源序列采集双能CT结肠成像容积扫描模式扫描时间较短、辐射剂量较低、运动校正算法体配准后结直肠双能融合图像质量较好。Objective To compare the scanning time,radiation dosage,and image quality of dual-energy fusion images after body registration based on motion correction algorithm of volume and helical scan mode of single-source dual-energy CT colonography with sequential acquisitions.Methods There were 46 volunteers without history of conditions affecting gastrointestinal motor function in the study.Volume and helical mode scanning were performed with an Acquilion ONE 320 row CT scanner.Volume scan mode:wide-volume,slice thickness was 0.5 mm,tube voltage was 135 kVp/80 kVp,automatic tube current adjustment.Helical scan mode:pitch factor/helical pitch=0.085/6.8,slice thickness was 0.5 mm×80.0 mm,tube voltage 135 kVp/80 kVp,tube current 10 mA/60 mA.Two radiologists evaluated the quality of dual-energy fusion colorectal images with 2 scan modes before and after body registrations based on motion correction algorithm using blindness method,and their consensus was used as the evaluation results.Scanning time and radiation dosage were analyzed,quality of dual-energy fusion colorectal images with 2 scan modes after body registration based on motion correction algorithm was analyzed.Results For volume and helical scanning modes,their scanning time were(12.31±2.32)s,(39.55±3.08)s,respectively,and the difference was statistical significant(t=47.912 4,P<0.01);their effective radiation dosage were(4.14±1.51)mSv,(4.71±0.91)mSv,respectively,and the difference was statistical significant(t=2.193 0,P<0.05);the level 1 of quality of dual-energy fusion colorectal images with 2 scan modes after body registration based on motion correction algorithm were 96.7%,62.6%,respectively,and the difference was significant statistical significance(U=8.978 6,P<0.01).Conclusion Volume scan mode of single-source dual-energy CT colonography with sequential acquisitions has shorter scanning time,lower radiation dosage,and better image quality after body registration based on motion correction algorithm.

关 键 词：单源CT序列采集 双能CT结肠成像 扫描模式 图像质量 辐射剂量 

分 类 号：R816.5[医药卫生—放射医学]