PI-TOF、CS-TOF和PETRA-MRA在脑血管成像中的对比研究  

Comparative study of PI-TOF,CS-TOF and PETRA-MRA in cerebrovascular imaging

作　　者：郝祥程 高阳[1] 赵鹤 马雪英 张华鹏 王少彧 HAO Xiangcheng;GAO Yang;ZHAO He;MA Xueying;ZHANG Huapeng;WANG Shaoyu(Department of Imaging,the Affiliated Hospital of Inner Mongolia Medical University,Huhhot 010050,China;MR Scientific Marketing,Siemens Healthineers,Shanghai 201318,China)

机构地区：[1]内蒙古医科大学附属医院影像科,内蒙古呼和浩特010050 [2]西门子医疗系统有限公司磁共振科研市场部,上海201318

出　　处：《实用放射学杂志》2023年第6期1014-1018,共5页Journal of Practical Radiology

摘　　要：目的探讨头颅并行采集时间飞跃法(PI-TOF)、压缩感知时间飞跃法(CS-TOF)和径向采集逐点编码缩短时间磁共振血管成像(PETRA-MRA)在常规脑血管成像中的应用价值。方法CS-TOF根据不同的加速因子(AF)4.6,7.2和10.3,分别设CS 4.6-TOF、CS 7.2-TOF和CS 10.3-TOF。纳入20例同时行PI-TOF、CS 4.6-TOF、CS 7.2-TOF、CS 10.3-TOF和PETRA-MRA 5组序列检查的受试者,针对图像质量进行主观和客观评价,主观评价包括图像质量和分支小血管显示能力,客观评价包括图像信噪比(SNR)和对比噪声比(CNR)。结果PI-TOF、CS 4.6-TOF、CS 7.2-TOF、CS 10.3-TOF和PETRA-MRA扫描时间分别为10 min 38 s、5 min 38 s、3 min 41 s、2 min 42 s和7 min 7 s。主观评价中,CS 4.6-TOF和CS 7.2-TOF图像的诊断质量与PI-TOF无明显差异,优于CS 10.3-TOF和PETRA-MRA,PETRA-MRA在颈内动脉虹吸部信号更均匀。PI-TOF对分支小血管的显示能力更好。客观评价中,CS 4.6-TOF、和CS 7.2-TOF在大脑中动脉M1段的SNR和CNR均较高,二者相比无统计学差异。结论在等体素0.8 m3的PI-TOF、CS-TOF和PETRA-MRA的研究中,结合主观评价与客观评价,CS 7.2-TOF图像既保证较高的图像质量,又极大地缩短了扫描时间,可以改善MRA的整体工作流程。Objective To explore the advantages of parallel imaging time-of-flight(PI-TOF),compressed sensing time-of-flight(CS-TOF)and pointwise encoding time reduction with radial acquisition in subtraction-based magnetic resonance angiography(PETRA-MRA)in conventional cerebrovascular imaging.Methods A total of 20 subjects who underwent PI-TOF,CS-TOF and PETRA-MRA at the same time were enrolled in this study.According to the acceleration factor(AF)coefficients 4.6,7.2 and 10.3 adopted by CS,each patient obtained PI-TOF,CS 4.6-TOF,CS 7.2-TOF,CS 10.3-TOF and PETRA-MRA were five groups of images.Image analysis included subjective and objective evaluations.Subjective evaluation included image quality and branch small blood vessel display ability.For objective evaluation,included signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR).Results The scanning times of PI-TOF,CS 4.6-TOF,CS 7.2-TOF,CS 10.3-TOF and PETRA-MRA were 10 min 38 s,5 min 38 s,3 min 41 s,2 min 42 s and 7 min 7 s,respectively.In subjective evaluation,the diagnostic quality of CS 4.6-TOF and CS 7.2-TOF images was not significantly different from that of PI-TOF,which was better than that of CS 10.3-TOF and PETRA-MRA.PI-TOF had better display ability in branch vessels,but PETRA-MRA had more uniform signal in the siphon of internal carotid artery.In the objective evaluation,the SNR and CNR of CS 4.6-TOF and CS 7.2-TOF in the middle cerebral artery M1 segment were higher,and there was no significant difference between them.Conclusion In the study of PI-TOF,CS-TOF and PETRA-MRA with isovoxel 0.8 m3,combined with subjective and objective evaluations,the CS 7.2-TOF imaging not only has higher image quality,but also can shorted the scanning time,which can be used as a routine clinical examination about MRA.

关 键 词：并行采集 压缩感知 磁共振血管成像 

分 类 号：R445.2[医药卫生—影像医学与核医学] R816.1[医药卫生—诊断学]