基于压缩感知技术联合风车采集优化颅脑T2加权成像  

Acceleration of T2⁃Weighted Head Multivane Imaging by Compressed Sensing

作　　者：刘娜 王楠[1] 张浩南 胡帅[1] 浦仁旺[1] 苗延巍[1] 林良杰 宋清伟[1] LIU Na;WANG Nan;ZHANG Haonan(Department of Radiology,the First Affiliated Hospital of Dalian Medical University,Dalian,Liaoning Province 116011,P.R.China)

机构地区：[1]大连医科大学附属第一医院放射科,116011 [2]飞利浦医疗(中国),北京100036

出　　处：《临床放射学杂志》2023年第9期1513-1518,共6页Journal of Clinical Radiology

摘　　要：目的探索不同压缩感知(CS)加速因子(AF)结合不同风车采集(MV)填充百分比(AQP)对颅脑T2加权磁共振成像图像质量的影响。方法前瞻性招募志愿者21例,于3.0T MR行常规快速自旋回波(TSE)T2WI序列和T2WI-MVXD序列。T2WI-MVXD序列由4种AF(敏感度编码SENSE 2以及CS 2、3、4)与3种MV AQP(160%、210%、260%)两两联合组成。两名观察者在颅脑T2WI轴位原始图上划定感兴趣区测量信号强度(SI)和标准差(SD),并计算信噪比(SNR)和对比噪声比(CNR),并对图像质量进行四分法主观评分。使用组内相关系数(ICC)及Kappa检验评估两名观察者测量数据和主观评分的一致性;若一致性良好,选择高年资医师的测量和评分结果进行后续分析。使用Friedman检验不同AF之间SNR、CNR及主观评分的差异性。若差异性有统计学意义,使用最小差异性检验(LSD法)进行两两比较。结果两名观察者测量数据和主观评分一致性良好(ICC:0.971~0.996;Kappa:0.769~1.000)。与常规TSE序列相比,所有T2WI-MVXD序列均获得高SNR和CNR图像(P<0.001)。采用相同AF的扫描方案,各部位SNR和CNR随着MV AQP的增加而增加;采用相同MV AQP的扫描方案,SNR和CNR随着CS加速因子的增加而减少,胼胝体SNR、CNR及小脑CNR差异有统计学意义(P<0.05)。在扫描时间相当的几个扫描方案前提下,AF=CS3(210%)组合序列的胼胝体、小脑SNR和脑桥CNR均高于AF=CS2(160%)和AF=CS4(260%)(P<0.05)。结论AF=CS3结合MV AQP 210%的扫描方案能够在保证图像质量满足诊断要求的情况下,扫描时间缩短了25%(72 s vs.96 s),推荐用于临床常规扫描。Objective Exploring the impact of different acceleration factors(AF)of compressed SENSE(CS)com⁃bined with different MultiVane(MV)acquisition percentages(AQP)on the image quality of T2 weighted imaging(T2 WI).Methods A total of 21 subjects(9 males,mean age:38.95±19.56)were scanned using a 3.0 T MR scan⁃ner.Each subject underwent a series of T2 WI scans with varying CS acceleration factors(CS=2,3,and 4)combined with different MV AQPs(160%,210%,and 260%).Two observers delineated the ROI on the original image to measure the sig⁃nal intensity(SI)and standard deviation(SD),and then to calculate the signal to noise ratio(SNR)and contrast to noise ratio(CNR).Subjective scoring of image quality was evaluated by a 4⁃point scale.The intraclass correlation coefficient(ICC)and Kappa test were adopted to evaluate the consistency of the objective measurement and subjective scores by the two radiologists,respectively.The Friedman test was used to assess differences of SNR,CNR and scores among images by different CS factor and MV AQP,and the LSD test was employed to make a pairwise comparison.Results The measure⁃ment data and the score of the two observers were in good agreement(ICC:0.971-0.996;Kappa:0.769-1.000).The SNR and CNR measured in different brain regions by MV scans with different scan settings were mostly higher than those of the conventional Cartesian turbo spin echo scan(P<0.001).For MV⁃T2 WI with the same CS acceleration factor,SNR and CNR increase with the increase of AQP.For MV⁃T2 WI with the same MV AQP,SNR and CNR decrease with the increase of AF.The differences in corpus callosum SNR,CNR,and cerebellar CNR were statistically significant(P<0.05).For MV⁃T2 WI with a similar scan time,AF=CS3(210%)of callosum,cerebellar SNR and pons CNR were higher than AF=CS2(160%)and AF=CS4(260%)(P<0.05).Conclusion The combination of AF=CS3 with AQP=210%can re⁃duce the scan time by 25%(72s VS.96s)while ensure the image quality.Therefore,it is recommended for routine clinical brain T2 WI scan.

关 键 词：风车采集 磁共振成像 压缩感知 

分 类 号：R445.2[医药卫生—影像医学与核医学] R741[医药卫生—诊断学]