This study is to compare three-dimensional(3D)isotropic T2-weighted magnetic resonance imaging(MRI)with compressed sensing-sampling perfection with application optimized contrast(CS-SPACE)and the conventional image(3D...This study is to compare three-dimensional(3D)isotropic T2-weighted magnetic resonance imaging(MRI)with compressed sensing-sampling perfection with application optimized contrast(CS-SPACE)and the conventional image(3D-SPACE)sequence in terms of image quality,estimated signal-to-noise ratio(SNR),relative contrast-to-noise ratio(CNR),and the lesions’conspicuous of the female pelvis.Thirty-six females(age:51,28-73)with cervical carcinoma(n=20),rectal carcinoma(n=7),or uterine fibroid(n=9)were included.Patients underwent magnetic resonance(MR)imaging at a 3T scanner with the sequences of 3D-SPACE,CS-SPACE,and twodimensional(2D)T2-weighted turbo-spin echo(TSE).Quantitative analyses of estimated SNR and relative CNR between tumors and other tissues,image quality,and tissue conspicuity were performed.Two radiologists assessed the difference in diagnostic findings for carcinoma.Quantitative values and qualitative scores were analyzed,respectively.The estimated SNR and the relative CNR of tumor-to-muscle obturator internus,tumor-to-myometrium,and myometrium-to-muscle obturator internus was comparable between 3D-SPACE and CS-SPACE.The overall image quality and the conspicuity of the lesion scores of the CS-SPACE were higher than that of the 3D-SPACE(P<0.01).The CS-SPACE sequence offers shorter scan time,fewer artifacts,and comparable SNR and CNR to conventional 3D-SPACE,and has the potential to improve the performance of T2-weighted images.展开更多
目的探讨压缩感知(Compressed Sensing,CS)技术在屏气磁共振胰胆管造影(Magnetic Resonance Cholangiopancreatography,MRCP)中的临床应用价值。方法对40例患者同时行膈肌导航3D可变反转角快速自旋回波(Sampling Perfection with Applic...目的探讨压缩感知(Compressed Sensing,CS)技术在屏气磁共振胰胆管造影(Magnetic Resonance Cholangiopancreatography,MRCP)中的临床应用价值。方法对40例患者同时行膈肌导航3D可变反转角快速自旋回波(Sampling Perfection with Application-Optimized Contrast Using Different Flip-Angle Evolutions,SPACE)MRCP和屏气压缩感知3D MRCP(欠采样率3.6%)序列扫描,根据序列不同将图像分为SPACE-MRCP和CS-MRCP 2组。定性分析2组图像整体质量、背景抑制效果和胰管的显示能力;定量分析2组图像的扫描时间、信噪比(Signal to Noise Ratio,SNR)和对比噪声比(Contrast to Noise Ratio,CNR)。结果图像整体质量评分、背景抑制效果方面,CS-MRCP均优于SPACE-MRCP,差异有统计学意义(P<0.05)。胰管显示能力方面,CS-MRCP与SPACE-MRCP相当,差异无统计学意义(P<0.05);SPACE-MRCP和CS-MRCP扫描时间分别为(260.95±61.70)、17 s,差异有统计学意义(P<0.05)。SNR和CNR分析中,CS-MRCP均优于SPACE-MRCP,差异有统计学意义(P<0.05)。结论采用压缩感知技术的屏气MRCP序列与膈肌导航3D SPACE序列相比,可显著缩短扫描时间,获得更好的图像质量。展开更多
目的探讨参数优化后的三维快速自旋回波序列(3D sampling perfection with application optimized contrasts using different flip angle evolutions,3D-SPACE)在儿童磁共振胰胆管造影(magnetic resonance cholangiopancreatogaphy,MR...目的探讨参数优化后的三维快速自旋回波序列(3D sampling perfection with application optimized contrasts using different flip angle evolutions,3D-SPACE)在儿童磁共振胰胆管造影(magnetic resonance cholangiopancreatogaphy,MRCP)检查中提升图像质量的应用价值。方法对30例患儿采用经优化参数3D-SPACE序列及常规参数3D-SPACE序列进行MRCP扫描,对两种扫描序列得到的图像进行对比分析,比较两种扫描的质量差异。结果经优化后的3D-SPACE序列扫描时间是(50±7)s,常规3D-SPACE序列扫描时间是(210±33)s,2种序列间差异有统计学意义(t=15.95,P=0.000)。优化参数3D-SPACE序列得4分图像的24例,占80%(24/30);3分图像3例,占10%(6/30);2分图像2例,占7%(2/30);1分图像1例,占3%(1/30);常规3D-SPACE序列得4分图像的15例,占50%(15/30);3分图像9例,占30%(9/30);2分图像5例,占17%(5/30);1分图像1例,占3%(1/30),2种序列间差异有统计学意义(Z=2.254,P=0.024),优化3D-SPACE序列在呼吸运动伪影、胆总管、胆囊管、肝总管、肝内胆管显示,病灶清晰度和图像质量方面均优于常规3D-SPACE序列。结论优化参数3D-SPACE能减少扫描时间,明显减少儿童MRCP的运动伪影,改善图像质量。在儿童磁共振胆道系统疾病检查中具有较高的应用价值。展开更多
目的探讨1.5T磁共振三维可变反转角快速自旋回波(t h r e edimensional sampling perfection with application-optimized contrasts using different flip angle evolution,3D-SPACE)序列在矢状窦旁脑膜瘤术前评价中的价值。方法收集3...目的探讨1.5T磁共振三维可变反转角快速自旋回波(t h r e edimensional sampling perfection with application-optimized contrasts using different flip angle evolution,3D-SPACE)序列在矢状窦旁脑膜瘤术前评价中的价值。方法收集35例经手术病理证实的矢状窦旁脑膜瘤患者,术前均行常规MRI、增强磁共振静脉成像(magnetic resonance venography,CE-MRV)及3D-SPACE扫描,两名观察者对矢状窦旁脑膜瘤进行分型同时观察侧支循环显示情况。结果以手术结果为金标准,CE-MRV及3D SPACE对矢状窦旁脑膜瘤分型的总准确率分别为80.0%、91.4%,3D SPACE分型准确率高于CE-MRV(P<0.05)。CE-MRV与3D SPACE对侧支循环的正确显示率分别为80.6%、82.5%(P>0.05)。结论1.5T磁共振3D-SPACE能够提高矢状窦旁脑膜瘤术前分型的准确率且较清晰显示侧支循环情况,对于矢状窦旁脑膜瘤术前评估具有重要意义。展开更多
文摘This study is to compare three-dimensional(3D)isotropic T2-weighted magnetic resonance imaging(MRI)with compressed sensing-sampling perfection with application optimized contrast(CS-SPACE)and the conventional image(3D-SPACE)sequence in terms of image quality,estimated signal-to-noise ratio(SNR),relative contrast-to-noise ratio(CNR),and the lesions’conspicuous of the female pelvis.Thirty-six females(age:51,28-73)with cervical carcinoma(n=20),rectal carcinoma(n=7),or uterine fibroid(n=9)were included.Patients underwent magnetic resonance(MR)imaging at a 3T scanner with the sequences of 3D-SPACE,CS-SPACE,and twodimensional(2D)T2-weighted turbo-spin echo(TSE).Quantitative analyses of estimated SNR and relative CNR between tumors and other tissues,image quality,and tissue conspicuity were performed.Two radiologists assessed the difference in diagnostic findings for carcinoma.Quantitative values and qualitative scores were analyzed,respectively.The estimated SNR and the relative CNR of tumor-to-muscle obturator internus,tumor-to-myometrium,and myometrium-to-muscle obturator internus was comparable between 3D-SPACE and CS-SPACE.The overall image quality and the conspicuity of the lesion scores of the CS-SPACE were higher than that of the 3D-SPACE(P<0.01).The CS-SPACE sequence offers shorter scan time,fewer artifacts,and comparable SNR and CNR to conventional 3D-SPACE,and has the potential to improve the performance of T2-weighted images.
文摘目的探讨压缩感知(Compressed Sensing,CS)技术在屏气磁共振胰胆管造影(Magnetic Resonance Cholangiopancreatography,MRCP)中的临床应用价值。方法对40例患者同时行膈肌导航3D可变反转角快速自旋回波(Sampling Perfection with Application-Optimized Contrast Using Different Flip-Angle Evolutions,SPACE)MRCP和屏气压缩感知3D MRCP(欠采样率3.6%)序列扫描,根据序列不同将图像分为SPACE-MRCP和CS-MRCP 2组。定性分析2组图像整体质量、背景抑制效果和胰管的显示能力;定量分析2组图像的扫描时间、信噪比(Signal to Noise Ratio,SNR)和对比噪声比(Contrast to Noise Ratio,CNR)。结果图像整体质量评分、背景抑制效果方面,CS-MRCP均优于SPACE-MRCP,差异有统计学意义(P<0.05)。胰管显示能力方面,CS-MRCP与SPACE-MRCP相当,差异无统计学意义(P<0.05);SPACE-MRCP和CS-MRCP扫描时间分别为(260.95±61.70)、17 s,差异有统计学意义(P<0.05)。SNR和CNR分析中,CS-MRCP均优于SPACE-MRCP,差异有统计学意义(P<0.05)。结论采用压缩感知技术的屏气MRCP序列与膈肌导航3D SPACE序列相比,可显著缩短扫描时间,获得更好的图像质量。
文摘目的探讨参数优化后的三维快速自旋回波序列(3D sampling perfection with application optimized contrasts using different flip angle evolutions,3D-SPACE)在儿童磁共振胰胆管造影(magnetic resonance cholangiopancreatogaphy,MRCP)检查中提升图像质量的应用价值。方法对30例患儿采用经优化参数3D-SPACE序列及常规参数3D-SPACE序列进行MRCP扫描,对两种扫描序列得到的图像进行对比分析,比较两种扫描的质量差异。结果经优化后的3D-SPACE序列扫描时间是(50±7)s,常规3D-SPACE序列扫描时间是(210±33)s,2种序列间差异有统计学意义(t=15.95,P=0.000)。优化参数3D-SPACE序列得4分图像的24例,占80%(24/30);3分图像3例,占10%(6/30);2分图像2例,占7%(2/30);1分图像1例,占3%(1/30);常规3D-SPACE序列得4分图像的15例,占50%(15/30);3分图像9例,占30%(9/30);2分图像5例,占17%(5/30);1分图像1例,占3%(1/30),2种序列间差异有统计学意义(Z=2.254,P=0.024),优化3D-SPACE序列在呼吸运动伪影、胆总管、胆囊管、肝总管、肝内胆管显示,病灶清晰度和图像质量方面均优于常规3D-SPACE序列。结论优化参数3D-SPACE能减少扫描时间,明显减少儿童MRCP的运动伪影,改善图像质量。在儿童磁共振胆道系统疾病检查中具有较高的应用价值。
文摘目的探讨1.5T磁共振三维可变反转角快速自旋回波(t h r e edimensional sampling perfection with application-optimized contrasts using different flip angle evolution,3D-SPACE)序列在矢状窦旁脑膜瘤术前评价中的价值。方法收集35例经手术病理证实的矢状窦旁脑膜瘤患者,术前均行常规MRI、增强磁共振静脉成像(magnetic resonance venography,CE-MRV)及3D-SPACE扫描,两名观察者对矢状窦旁脑膜瘤进行分型同时观察侧支循环显示情况。结果以手术结果为金标准,CE-MRV及3D SPACE对矢状窦旁脑膜瘤分型的总准确率分别为80.0%、91.4%,3D SPACE分型准确率高于CE-MRV(P<0.05)。CE-MRV与3D SPACE对侧支循环的正确显示率分别为80.6%、82.5%(P>0.05)。结论1.5T磁共振3D-SPACE能够提高矢状窦旁脑膜瘤术前分型的准确率且较清晰显示侧支循环情况,对于矢状窦旁脑膜瘤术前评估具有重要意义。
文摘目的比较3.0 T MRI 3种扫描序列对颈神经根成像的应用价值。材料与方法收集临床需要扫描颈椎MRI患者37例,均行常规序列、三维双回波稳态(three-dimensional double-echo steady state,3D-DESS)序列、多回波数据图像重合(multi-echo data image combination,MEDIC)序列、可变反转角三维快速自旋回波(3D sampling perfection with application optimized contrasts using different flip angle evolutions,3D-SPACE)序列扫描,所有图像均进行后处理重建,对图像质量和正常颈神经根显示、受压颈神经显示清晰度、颈神经根与邻近组织的对比噪声比(contrast noise ratio,CNR)3个方面进行评价。结果 3种扫描序列3个方面两两比较,3D-DESS序列神经根-椎体CNR和神经根-脑脊液CNR均高于MEDIC序列;3D-DESS序列神经根-椎体CNR高于3D-SPACE序列,而3D-DESS序列神经根-脑脊液CNR低于3D-SPACE序列;3D-SPACE序列神经根-脑脊液CNR高于MEDIC序列,3D-SPACE序列神经根-椎体CNR与MEDIC序列差异无统计学意义。图像质量评分3种序列两两对比差异均有统计学意义(P<0.05),3D-DESS序列优于MEDIC序列,而3D-SPACE序列图像质量最差。对受压神经根清晰度的显示,3D-DESS序列和MEDIC序列差异无统计学意义,两序列与3D-SPACE序列对比,差异均有统计学意义(P<0.05),即两序列均优于3D-SPACE序列。结论对于显示神经根结构和诊断神经根病变等方面,3D-DESS序列明显优于MEDIC序列和3D-SPACE序列,对颈神经根成像及颈神经根受压的临床诊断更具优势。
