双低扫描技术联合自适应统计迭代重建技术在能谱CT冠状动脉成像中的应用研究

  本文关键词：双低扫描技术联合自适应统计迭代重建技术在能谱CT冠状动脉成像中的应用研究，由笔耕文化传播整理发布。

双低扫描技术联合自适应统计迭代重建技术在能谱CT冠状动脉成像中的应用研究

Applied research on double low scanning technique in gem spectrum ct coronary artery angiography

[1] [2] [3]

SONG Juan, WANG Chengwei, LI Yong （ Shihezi Medical College ,Shihezi 832002,China）

[1]石河子大学医学院,新疆石河子832002; [2]石河子大学医学院第一附属医院,新疆石河子832002;

文章摘要：目的：探讨双低扫描技术联合自适应统计迭代重建技术（ASiR）在心率≤65次/min患者中行宝石能谱 CT 冠状动脉成像的可行性。方法收集90例心率≤65次/min拟行冠状动脉增强扫描的患者,随机分为 A、B、C 3组,A组行双低扫描技术,B组行常规扫描模式＋常规剂量对比剂,C组行常规扫描模式＋低剂量对比剂,各组均采用前瞻性心电门控扫描技术,B、C2组扫描数据采用常规120 kVp结合滤波反投影法（FBP）重建,A组病例扫描数据分别进行60 keV单能量下 FBP重建（A组）及 ASiR40%重建（A1组）,对比分析4组冠状动脉成像的图像质量及 A、B、C 3组患者检查中所接受的有效辐射剂量（ED）。结果 4组冠状动脉分支CT值、图像噪声、信噪比（SNR）、对比噪声比（CNR）,各指标差异均有统计学意义（P 值均＜0.001）,其中 A1组图像 SNR 、CNR最高,C组各冠状动脉分支图像噪声最低。A1组与B组冠状动脉评分差异无统计学意义（χ2=0.01,P=1.000）,A 组与 B组（χ2=22.428,P＜0.001）、B组与C组（χ2=39.005,P＜0.001）、A1组与 A组（χ2=21.854,P＜0.001）冠状动脉评分差异均有统计学意义,A组患者接受的 ED（2.60 mSv±0.26 mSv）低于B组（3.02 mSv±0.36 mSv）（t=3.738,P=0.001）及C组（3.11 mSv ±0.23 mSv）（t=3.725,P=0.001）。结论双低扫描技术联合 ASiR在宝石能谱CT冠状动脉成像中是可行的,能够获得良好的图像质量,患者所接受的辐射剂量及对比剂风险也大大降低,使冠状动脉CT成像技术更趋完美。

Abstr：Objective To investigate the feasibility of double low scanning technique using the gem spectrum CT coronary artery angiography among the patients at low heart rate≤ 65 beats per minute.Methods This prospective study was approved by the institutional re-view board with patient informed consent.Ninty patients （heart rate≤65 beats per minute）were randomly devided into 3 groups.Group A un-derwent spectral CCTA with iodixanol （Visipaque,270mg/mL）and low scanning technique,Group B conventional CCTA with iohexol （Omnipaque,370 mg/mL）and Group C conventional CCTA with iodixanol （Visipaque,270 mg/mL）,Routine scan mode was used in Group B and Group C.Prospective ECG gating mode was used in all groups.120kVp polychromatic images with FBP algorithm （Group B and Group C）were reconstructed for conventional CCTA,60 keV monochromatic images with FBP algorithm （Group A） or with a fixed blending level （40%）of ASiR （Group A1 ）were reconstructed for spectral CCTA.Compared the image quality of four groups and ED in three groups.Results The difference was ststistically significant between four groups with the CT value,im-age noise,SNR and CNR of coronary （each P〈0.001.Group A1 has the highest SNR and CNR.Group C has the lowest image noise.There were no significant difference of coronary score between group A1 and group B（χ2=0.01,P=1.000））.There was significant difference of coronary score between group A and group B （χ2=22.428,P〈0.001）,group B and group C （χ2=39.005,P〈0.001）, group A1 and group A （χ2=21.854,P〈0.001）.Effective radiation dose in the group A（ED2.60±0.26 mSv）was lower than that of group B （ED3.02±0.36 mSv）（t=3.738,P=0.001）and group C （ED3.11±0.23）（t=3.725,P=0.001）.Conclusion Double low scan-ning technique using the gem spectrum CT corona

文章关键词：

Keyword：:double low gem spectrum CT coronary artery angiography radiation dose

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  本文关键词：双低扫描技术联合自适应统计迭代重建技术在能谱CT冠状动脉成像中的应用研究，，由笔耕文化传播整理发布。