光梭径向采集技术在屏气配合欠佳状态下肝脏动态增强扫描中的应用价值  

Application of united compressed sensing with radial acquisition technology in liver dynamic contrast-enhanced scanning in patients with poor breath-holding

作　　者：邓和平[1] 张宇 杨学刚[1] 卢予婕 王丹[1] 董晓蕾[1] 何雅坤[1] 陈佳 王闽[1] DENG He-ping;ZHANG Yu;YANG Xue-gang(Department of Radiology,Sichuan cancer Hospital&institute,Chengdu 610000,China)

机构地区：[1]四川省肿瘤医院研究所影像诊断部,成都610000 [2]上海联影医疗科技股份有限公司磁共振临床培训部,上海201800

出　　处：《放射学实践》2023年第5期631-635,共5页Radiologic Practice

基　　金：北京医学奖励基金会课题(YXJL-2020-0972-0424)。

摘　　要：目的:探讨光梭径向采集(uCSR)技术在屏气配合欠佳患者进行肝脏动态增强扫描中的应用价值。方法:搜集35例无法配合屏气检查的患者作为研究对象,在自由呼吸状态下采用uCSR序列进行肝脏动态增强扫描,该序列扫描结束后立即进行3D-VIBE序列扫描。由两位高年资医师采用5分法分别对uCSR重建的各期相准确性、uCSR序列延迟期与3D-VIBE序列延迟期总体图像质量及呼吸运动伪影抑制效果进行评分。由两位高年资技师对uCSR序列延迟期和3D-VIBE序列延迟期图像进行信噪比(SNR)及对比噪声比(CNR)值测量。结果:两位医师对uCSR重建的各期相准确性评分均高于4.0分(分别为4.86±0.355、4.83±0.382),表明uCSR序列能获得准确的肝脏动态增强扫描期相。对3D-VIBE序列和uCSR序列扫描的延迟期图像进行总体质量评分,结果显示uCSR图像明显优于3D-VIBE(Z=-5.241,P=0.000)。对3D-VIBE序列与uCSR序列延迟期图像的呼吸运动伪影抑制效果进行评分,结果显示uCSR图像更优(Z=-5.279,P=0.000)。对两组图像质量进行客观评价,结果显示3D-VIBE图像的SNR稍优于uCSR(Z=-2.359,P=0.018),CNR差异无统计学意义(Z=-1.753,P=0.08)。结论:对于屏气配合欠佳的患者进行肝脏动态增强扫描时,uCSR序列可以获得良好的图像,具有一定临床应用价值。Objective:To investigate the value of United imaging Compressed Sensing with Radial acquisition(uCSR)technology in liver dynamic contrast-enhanced(DCE)scanning in patients with poor breath-holding ability.Methods:35 patients who failed to cooperate with the breath-hold examination were included in this study.They received DCE scanning with uCSR sequence in free-breathing state,followed immediately with 3D-VIBE sequence scanning.Two senior physicians scored the phase accuracy of uCSR reconstruction,the overall quality of the delayed phase images of uCSR sequence and 3D-VIBE sequence,the suppressing effect of respiratory motion artifacts using the 5-point scales.Two senior technicians measured signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)of the delay phase images of uCSR sequence and 3D-VIBE sequence.Results:The mean scores of each phase accuracy for uCSR reconstruction rated by the two physicians are significantly higher than 4.0(4.86±0.355 and 4.83±0.382,respectively),indicating that the uCSR sequence can produce accurate phases.According to scores for the overall quality of the delay phase images of uCSR sequence and 3D-VIBE sequence,uCSR images are significantly better than 3D-VIBE(Z=-5.241,P=0.000).According to comparison between the delayed phase images of uCSR sequence and 3D-VIBE sequence in the suppressing effect on respiratory motion artifacts,uCSR images are better(Z=-5.279,P=0.000).For objective evaluation of image quality,3D-VIBE had slightly higher SNR than uCSR group(Z=-2.359,P=0.018),while CNR showed no significant difference(Z=-1.753,P=0.08).Conclusion:uCSR sequence can obtain excellent liver DCE images for patients with poor breath-holding and has potential in clinical application.

关 键 词：肝 磁共振成像 动态增强 信噪比 对比噪声比 压缩感知 

分 类 号：R575[医药卫生—消化系统] R445.2[医药卫生—内科学]