肝脏多b值扩散心率因素的评价

目的:评价心电门控技术心率因素对肝脏体素内不相干运动成像(IVIM)图像质量及参数值的影响.方法:选取20名接受心电门控IVIM DWI序列扫描的志愿者,设定6个b值(范围0,50,100,150,300,600s/mm2),按受检者心率分为2组,每组10例,实验组受检者心率≤70次/分,对照组受检者心率≥80次/分.由两名从事腹部MR影像诊断5年以上的高年资医师对所得MR图像进行分析,测量并分析图像SNR、ADC、IVIM各参数值,并对IVIM-DWI图像质量进行评价.结果:实验组所得图像伪影最少,解剖结构清晰,图像质量较高,不同b值时实验组SNR值均大于对照组,两组间差异有统计学意义(P＜0.05).两组ADC、D、D*、f值中,仅肝左叶的ADC值[实验组(1.432±0.299)×10-3mm2/s;对照组(1.945±0.543)×10-3 mm2/s]和D值[实验组(1.372±0.378)×10-3mm2/s;对照组(1.617±0.361)×10-3mm2/s]在两组间的差异有统计学意义(P值分别为0.000、0.013).结论:肝脏IVIM心电门控成像技术具有重要的临床价值,低心率心电门控IVIM DWI成像可得到较好的图像质量和稳定可靠的参数值.     

体素不相干运动扩散加权成像在鉴别头颈部鳞癌淋巴结转移中的应用

目的 评价基于体素不相干运动(IVIM)模型计算出的真实扩散系数(D)、灌注相关扩散系数(D*)、灌注分数(f)和表观扩散系数(ADC)在鉴别头颈部鳞癌(HNSCC)淋巴结转移中的价值.方法 回顾性分析2013年9月至2014年12月间HNSCC及良性淋巴结增生(LNH)患者46例临床资料,其中26例确诊HNSCC患者(男18例,女8例,平均年龄48岁)为A组,20例确诊LNH患者(男12例,女8例,平均年龄41岁)为B组.所有患者均进行3.0 T MR扫描,并于MR检查结束后2周通过手术或穿刺取得病理结果.IVIM-DWI采用13个b值.使用Mann-Whitney检验比较两组间D,D*,f和ADC值,用ROC曲线评价ADC、D和D*值的诊断效能.结果 A组共检出33个淋巴结,B组共检出22个淋巴结(最小直径均＞5 mm).A组ADC值为(1.08 ±0.26) ×10-3mm2/s,和B组(1.25 ±0.19)×10-3mm2/s相比,差异有统计学意义(P =0.035).A组的D值为(0.57 ±0.12)×10-3mm2/s,B组为(0.74±0.21) ×10-3 mm2/s,A组较B组显著降低(P＜0.01).A组的f值为0.20 ±0.02,B组为0.32 ±0.05,差异有统计学意义(P＜0.01);而A组D*值为(120.89 ±26.94)×10-3mm2/s,B组为(68.78±17.71)×10-3mm2/s,A组较B组显著增高(P＜0.01).D*值的ROC曲线下面积(AUC)为0.952,大于D值(0.78)和ADC值(0.67).结论 IVIM DWI技术在HNSCC淋巴结转移的鉴别诊断中是可行的,恶性淋巴结中降低的D值反映了高核浆比,而升高的D*值在一定程度上可反映恶性淋巴结增多的新生血管与组织灌注.     

小视野体素内不相干运动成像在宫颈癌中的初步研究

目的探讨小视野体素内不相干运动成像在宫颈癌患者与正常宫颈间参数值的差异及应用价值。方法分析32例宫颈癌患者和24例正常宫颈的MRI资料,所有患者均行MRI常规序列和IVIM序列扫描,采用双指数模型分别计算出两组参数ADCstandard值、D值、D*值和f值,组间比较采用秩和检验,参数间的诊断效能用受试者工作特征曲线分析,统计数据P0.05有统计学意义。结果宫颈癌组ADCstandard值、D值、D*值和f值分别为(0.67,0.24)×10~(-3)mm~2/s、(0.43±0.1)×10~(-3) mm2/s、(8.04,6.31)×10~(-3) mm~2/s、(0.28,0.22),正常宫颈组上述各参数值分别为(0.71,0.25)×10~(-3) mm~2/s、(0.58±0.18)×10~(-3) mm~2/s、(12.75,7.16)×10~(-3) mm~2/s、(0.36,0.11),两组间ADCstandard值、D值、D*值和f值差异均具有统计学意义(Z值分别为-2.28、~(-3).1、~(-3).5、-2.62,P值0.05),曲线下面积依次为0.679、0.743、0.775和0.706。结论小视野体素内不相干运动成像可以用于检出宫颈癌,并能较准确定量反映宫颈癌扩散和灌注情况。     

IVIM-DWI在肝外胆管癌分级中的临床应用

目的 探讨体素内不相干运动磁共振扩散加权成像(IVIM-DWI)对肝外胆管癌(EHCC)病理分级的临床应用价值.方法 搜集经手术病理证实为EHCC,并于术前行3.0 T MRI常规序列及IVIM-DWI序列扫描的患者33例.测量计算以下参数:肿瘤DWI单指数成像ADC值;IVIM-DWI成像参数,包括真性扩散系数(D)值、灌注分数(f)值和假性扩散系数(D*)值.不同病理级别EHCC组间参数的比较采用单因素ANOVA检验(正态分布)或Kruskal-Wallis日检验(非正态分布),采用Spearman相关分析研究各参数和病理分级的相关性,通过受试者工作特征曲线(ROC)曲线下面积(AUC)来比较参数的诊断效能.结果 33例EHCC患者按照病理分级分为高分化(Ⅰ级)9例、中分化(Ⅱ级)13例和低分化(Ⅲ级)11例,ADC值分别为(1.34±0.23)×10-3 mm2/s、(1.22±0.19)×10-3 mm2/s、(0.97±0.13)×10-3mm2/s,D值分别为(1.31±0.15)×10-3mm2/s、(1.17±0.14)×10-3mm2/s、(0.86±0.12)×10-3mm2/s,D*值分别为(5.84 ±0.73)×10-3mm2/s、(6.39±1.67)×10-3mm2/s、(5.56±2.01)×10-3mm2/s,f值分别为37.35±9.01、30.91±8.55、22.78±7.47.不同病理分级组间D*值的差异无统计学意义(P＞0.05)外,其余参数的差异均有统计学意义(P＜0.05).ADC值、D值和f值均与病理分级呈负相关(r值分别为-0.677、-0.821、-0.582,P均＜0.05),ROC AUC分别为0.743、0.876、0.691,且差异存在统计学意义(P=0.000).结论 IVIM-DWI技术可以在一定程度上反映EHCC的组织分化程度和血供,对术前预测肿瘤病理分级具有一定价值.     

IVIM-DWI在胶质瘤术前分级中的应用及与常规DWI和ASL成像的对照分析

【摘要】目的：探讨体素内不相干运动扩散加权成像（IVIM-DWI）在胶质瘤术前分级中的临床应用价值,并与常规扩散加权成像（DWI）及动脉自旋标记（ASL）成像进行对照分析。方法：34例低级别胶质瘤和31例高级别胶质瘤患者在术前行3.0T MR IVIM-DWI和ASL扫描。数据经后处理获得肿瘤的慢扩散系数D、快扩散系数D*、快扩散容积分数f、ADC和CBF值。比较各项参数值在高级别和低级别胶质瘤间的差异,并采用ROC曲线分析其诊断效能;对肿瘤的D、D*和f值与ADC和CBF值之间的相关性进行分析。结果：高级别胶质瘤的D、f和ADC值均显著低于低级别组,CBF和D*值显著高于低级别组,差异均有统计学意义（P＜0.05）。D值取0.688×10-3mm2/s、D*值取2.77×10-3mm2/s时,可作为高、低级别胶质瘤分级的参考阈值;D*值的诊断效能最好（AUC＝0.889）,敏感度和特异度分别为93.5%和73.5%。CBF、ADC、D、f及f×D*值的AUC分别为0.844、0.796、0.796、0.745及0.587。肿瘤的ADC值与D、f值均呈正相关,与D*值呈负相关（P＜0.05）;而CBF值与D*值呈正相关,与D值呈负相关（P＜0.05）,与f值无显著相关性。结论：IVIM-DWI对于胶质瘤术前分级有较好的应用价值,与DWI及ASL成像相比各有优势,三种检查可相互补充。     

体素内不相干运动扩散加权成像在肝脏肿瘤病变中的诊断价值

目的探讨体素内不相干运动(IVIM)扩散加权成像对良性和恶性肝脏肿瘤的鉴别诊断价值。方法回顾性分析经手术病理证实或经随访证实的肝脏肿瘤性病变89例(123个病灶),根据病理学结果分为良性组肝肿瘤40例(57个病灶)和恶性组肝肿瘤49例(66个病灶)。所有患者均进行MR常规平扫T_1WI、T_2WI、多b值DWI及LAVA动态增强扫描,多b值DWI选用11个b值(b=0,10,20,30,50,80,100,200,400,800,1 000s/mm~2),多b值DWI通过ADW 4.6工作站测量得到纯扩散系数值(D)、假扩散系数值(D~*)及灌注分数(f),并比较这些参数在肝脏良恶性肿瘤性病变中的鉴别诊断价值。结果良性组、恶性组D值分别为(1.70±0.55)×10~(-3)mm~2/s、(1.04±0.34)×10~(-3)mm~2/s,D~*值分别为(21.7±19.5)×10~(-3)mm~2/s、(16.5±14.7)×10~(-3)mm~2/s,f值分别为(33.5±24.9)%、(23.3±15.5)%,良、恶性组D、D~*有统计学意义(D值P0.0001,D~*值P=0.001),两组间f没有显著差异。在鉴别诊断肝脏良恶性病变方面,D的曲线下面积(AUC)(0.865)、敏感性(87.%)、特异性(75.8%)和诊断准确率(96.36%)最高。结论体素内不相干运动扩散加权成像参数D和D~*值可提高肝脏肿瘤性病变的良恶性诊断及鉴别诊断的能力,而D值能够更可靠的区分肿瘤的良恶性。     

IVIM-DWI评价先天性肾脏和尿路畸形患儿分肾功能的可行性

【摘要】目的：探讨扩散加权成像（DWI）体素内不相干运动（IVIM）模型评价先天性肾脏和尿路畸形（CAKUT）患儿分肾功能的可行性。方法：回顾性分析34例行99mTc-DTPA肾动态显像和肾脏DWI检查的CAKUT患儿（74个肾脏）的资料。根据肾动态显像测定的分肾肾小球滤过率（GFR）将所有肾脏分为肾功能正常组（1组,34个肾脏）、轻度受损组（2组,25个肾脏）和中重度受损组（3组,15个肾脏）三组。DWI图像利用IVIM模型进行拟合,获得每个肾脏皮质的纯扩散系数D、假扩散系数D*和灌注分数f值。采用单因素方差分析比较三组间肾脏皮质D、D*和f值的差异,存在统计学差异再使用Bonferroni法进行组间两两比较。D、D*和f值与分肾GFR之间的相关性采用相关性分析。结果：1组的D、D*和f值分别为（1.64±0.82）×10-3mm2/s、（2.38±0.96）×10-3mm2/s和（33.71±7.11）%,2组的D、D*和f值分别为（1.23±0.53）×10-3mm2/s、（1.66±1.43）×10-3mm2/s和（30.48±8.26）%,3组的D、D*和f值分别为（1.23±0.3）×10-3mm2/s、（0.75±0.36）×10-3mm2/s和（17.1±5.4）%。三组间的D、D*和f值均随着分肾GFR的下降而降低,且差异均具有统计学意义（P值均＜0.05）。Bonferroni法组间两两比较结果显示,在1组与2组、1组与3组、2组与3组两两比较中,D值均无统计学差异（P=0.064,0.137,P＞0.999）;D*值在3组间两两比较均具有统计学差异（P=0.036,P＜0.001,P=0.034）;f值在1组与3组、2组与3组组间差异均具有统计学意义（P均＜0.001）。分肾GFR与D值（r＝0.350,P＝0.002）、D*值（r＝0.687,P<0.001）及f值（r＝0.706,P<0.001）之间均存在正相关。结论：IVIM-DWI可评估CAKUT患儿的分肾功能,D*和f在早期准确评价CAKUT患儿分肾功能中具有一定的潜能。     

拉伸指数与单指数模型DWI术前预测脑胶质瘤病理分级的对照

目的:探讨拉伸指数模型与单指数扩散加权成像(DWI)在脑胶质瘤术前分级中的应用价值.方法:回顾性分析经手术病理证实的40例脑胶质瘤患者的磁共振多b值图像.所有患者在手术前均行磁共振常规序列及多b值DWI(b=0、30、50、100、200、300、500、800、1000、1500、2000、3000、3500 s/mm2)扫描,经后处理获得肿瘤实体部分的DDC、α及ADC值.结果:40例胶质瘤中包括WHOⅡ级12例,Ⅲ级5例,Ⅳ级23例.低级别胶质瘤的平均DDC、α及ADC值均显著高于高级别胶质瘤[低级别:(1.04±0.23)×10-3mm2/s,(0.91±0.05)及(0.93±0.10)×10 3 mm2/s;高级别:(0.73±0.21)×10-3mm2/s,(0.82±0.07)和(0.60±0.13)×10 3 mm2/s,P＜0.05].当ADC值取0.755×10-3mm2/s时,区分低级别和高级别胶质瘤的敏感度和特异度分别为100％和89％,以DDC=0.929×10-3mm2/s为诊断阈值,分级诊断的敏感度及特异度分别为75％和89.3％,取α=0.827为诊断阈值,其敏感度及特异度分别为100％和64％.肿瘤实体部分的DDC与ADC值之间存在显著正相关(r=0.802,P＜0.05).结论:术前磁共振单指数和拉伸指数模型DWI能够准确地评估胶质瘤分级.与单指数DWI比较,拉伸指数模型并未表现出更高的效能.     

体素不相干运动与三维动脉自旋标记在胶质瘤中的对照研究

目的 与三维动脉自旋标记(3D ASL)对照,探讨体素不相干运动(IVIM)在胶质瘤分级中的应用价值.方法 搜集胶质瘤患者24例,其中高、低级别胶质瘤患者分别为13例和11例.受试者术前行多b值DWI(MBDWI)和三维伪连续动脉自旋标记(3D PCASL)序列扫描,MB-DWI采用0～3500 s/mm2间共20个b值,采用双指数模型软件处理获得快扩散系数D*(fast ADC),慢扩散系数D(slow ADC)以及快速扩散所占的容积分数f(fraction of fast ADC)三种参数化图像;ASL数据经工作站处理产生的脑血流量(CBF)图.分别测量肿瘤实质区最大CBF值及其相应区域的D*、D、f值,以对侧正常半卵圆中心白质做对照,计算其比值rTBF,rD*,rD,rf.所得数据经统计软件进行组间比较并对CBF值与D *、f值进行相关性分析,P＜0.05具有统计学意义.结果 高级别胶质瘤组的TBF值、rTBF和D*值显著高于低级别胶质瘤组,f值、rf值和D值、rD值正好相反,rD *值无统计学差异;相关分析结果显示肿瘤TBF值与D*值呈正相关性,而与f值呈负相关(P＜0.05);对侧正常半卵圆中心CBF值和D*值呈正相关性(P＜0.01),而与f值无相关性(P＞0.05).结论 IVIM双指数模型所得D*值、D值及f值在高、低级别胶质瘤中存在统计学差异,在评估脑胶质瘤血流灌注方面D*值与ASL结果之间有较好的相关性.     

基于体素内不相干运动的扩散加权成像对乳腺肿块病灶良恶性的诊断价值

目的 探讨基于体素内不相干运动(IVIM)的扩散加权成像(DWI)对乳腺肿块病灶的诊断价值.方法 前瞻性纳入术前行MRI检查且动态对比增强(DCE)表现为乳腺肿块的患者78例(87个病灶),分为良性组(n=29)与恶性组(n=58).通过单、双指数模型分别获得表观扩散系数(ADC)、单纯水分子扩散系数(D)、灌注相关的扩散系数(D*)和灌注分数(f)参数值.采用独立样本t检验分析组间各参数差异.绘制受试者工作特征曲线(ROC),分析各参数对乳腺肿块病灶的诊断效能.结果 恶性组ADC、D低于良性组(P ＜0.001),恶性组D*高于良性组(P=0.04).恶性组与良性组间f无明显差异(P＞0.05).以病理为金标准,ADC、D、D*值诊断乳腺恶性肿块病灶的曲线下面积(AUC)分别为0.88、0.92、0.62,D与ADC间差异有统计学意义(P=0.03).ADC、D、D*分别以1.19×10-3mm2/s、1.05×10-3mm2/s、7.55×10-3mm2/s为诊断阈值,敏感度分别为86.2％、89.7％、89.7％,特异度分别为89.7％、93.1％、37.9％,准确率分别为87.4％、89.7％、55.2％.结论 IVIM参数D对乳腺肿块病灶的诊断效能优于ADC,具有较高的敏感度和特异度,D*诊断效能一般,f诊断价值有限.     

DSA功能性参数的提取与利用

本文介绍了在临床实际中利用功能性参数，对冠状动脉ＤＳＡ心肌血流灌注成像、冠状动脉血流量测定、左心室功能测定、肺动脉高压程度的评价等项目研究结果。重点讨论了提取ＤＳＡ功能性参数的一般方法，认为功能性参数在现代影像诊断学中的作用是对疾病做出程度、定量、动态及功能诊断。     

Current Status of Optical Imaging for Evaluating Lymph Nodes and Lymphatic System

Optical imaging techniques use visual and near infrared rays. Despite their considerably poor penetration depth, they are widely used due to their safe and intuitive properties and potential for intraoperative usage. Optical imaging techniques have been actively investigated for clinical imaging of lymph nodes and lymphatic system. This article summarizes a variety of optical tracers and techniques used for lymph node and lymphatic imaging, and reviews their clinical applications. Emerging new optical imaging techniques and their potential are also described.     

Fast imaging of phosphocreatine in the normal human myocardium using a three-dimensional RARE pulse sequence at 4 Tesla

PURPOSE: To investigate the use of a three-dimensional rapid acquisition with relaxation enhancement (RARE) pulse sequence for direct acquisition of phosphocreatine (PCr) images of the human myocardium. MATERIALS AND METHODS: A short elliptical birdcage radiofrequency (RF) body coil was constructed to produce a uniform flip angle throughout the chest cavity. In vivo images using a spectrally-selective RARE sequence with a spatial resolution of 1.2 cm x 1.2 cm x 2.5 cm (4 cm(3)) were acquired in nine minutes and 40 seconds. RESULTS: Scans of phantoms demonstrated excellent spectral selectivity. The signal-to-noise ratio in the myocardium ranged from 12.6 in the anterior wall to 5.3 in the mid septum. CONCLUSION: This study demonstrates that PCr data can be acquired using a three-dimensional RARE sequence with greater spatial and temporal resolution than spectroscopic techniques.     

Molecular imaging of the lungs

An emerging suite of new imaging techniques offer the ability to monitor and quantify molecular and cellular processes in the lungs noninvasively. These techniques take advantage of dramatic advances in both imaging technology as well as molecular and cell biology. Molecular imaging is being used with increasing regularity in research protocols, and forms of molecular imaging have found their way into the patient care setting (eg, positron emission tomography imaging in cancer). Such techniques will afford the basic scientist as well as the clinician an unprecedented opportunity for in vivo study of the lung biology that drives normal pulmonary physiology as well as pathophysiology.     

Dynamic bioluminescence imaging for quantitative tumour burden assessment using IV or IP administration of <Emphasis Type="SmallCaps">d</Emphasis>-luciferin: effect on intensity,time kinetics and repeatability of photon emission

Introduction In vivo bioluminescence imaging (BLI) is a promising technique for non-invasive tumour imaging. d-luciferin can be administrated intraperitonealy or intravenously. This will influence its availability and, therefore, the bioluminescent signal. The aim of this study is to compare the repeatability of BLI measurement after IV versus IP administration of d-luciferin and assess the correlation between photon emission and histological cell count both in vitro and in vivo. Materials and methods Fluc-positive R1M cells were subcutaneously inoculated in nu/nu mice. Dynamic BLI was performed after IV or IP administration of d-luciferin. Maximal photon emission (PE_max) was calculated. For repeatability assessment, every acquisition was repeated after 4 h and analysed using Bland–Altman method. A second group of animals was serially imaged, alternating IV and IP administration up to 21 days. When mice were killed, PE_max after IV administration was correlated with histological cell number. Results The coefficients of repeatability were 80.2% (IV) versus 95.0% (IP). Time-to-peak is shorter, and its variance lower for IV (p < 0.0001). PE_max was 5.6 times higher for IV. A trend was observed towards lower photon emission per cell in larger tumours. Conclusion IV administration offers better repeatability and better sensitivity when compared to IP. In larger tumours, multiple factors may contribute to underestimation of tumour burden. It might, therefore, be beneficial to test novel therapeutics on small tumours to enable an accurate evaluation of tumour burden. Marleen Keyaerts is a Ph. D. fellow of the Research Foundation—Flanders (Belgium; FWO).     

Molecular imaging programs in the United States: results of a national survey

RATIONALE AND OBJECTIVES: We sought to identify and describe the characteristics of molecular imaging (MI) programs in the United States and to determine the factors considered critical for their future. MATERIALS AND METHODS: In a cross-sectional study, a validated survey was sent to members of the Society of Chairmen in Academic Radiology Departments (SCARD) in the United States, and 26 variables were studied. RESULTS: The response rate was 40.3%; 67.9% of the departments surveyed have an MI program. The main focus of 47.4% of departments is oncology. The number of radiologists working for the department was the only variable found to be significantly positively correlated with (1) number of researchers in the MI program, (2) number of MI modalities available, (3) total number of grants, and (4) having ongoing MI clinical trials. These four variables plus the number of federal grants and the space used by MI programs were independent of the geographical region, hospital size (number of beds), and department size (number of radiological examinations per year). All the MI programs received grants during 2005. Only 16.1% have no alliances with industry. Among all the departments, 82% identified staff training and recruitment as the keys for success; 78.57% considered oncology the most important future application of MI and cancer management the hospital service most affected by MI. CONCLUSION: MI programs are starting to be more widespread throughout the United States, and the trend is for more academic radiology departments to become engaged in MI activities; their development is independent of department characteristics. Radiology departments strongly agreed about the key components for success of MI initiatives and the areas that will be most affected by MI applications.     

Phase insensitive preparation of single-shot RARE: Application to diffusion imaging in humans

Although RARE and GRASE can produce single-shot images of excellent quality, their utility has been restricted because preparation of the magnetization with interesting contrast before imaging can cause severe artifacts. These artifacts relate to the strong sensitivity of multiple spin echo sequences to the phase of the prepared magnetization. Modifications of the RARE sequence to eliminate these artifacts are discussed, and an approach that eliminates the artifact producing signals from the very first echo is presented. The approach is applied to diffusion imaging of the human brain in normal volunteers and one patient.     

Head and neck imaging: the role of CT and MRI

High-resolution computed tomography (CT) and magnetic resonance imaging (MRI) have become indispensable tools for the evaluation of conditions involving the head and neck. Complex anatomic structures and regions, such as the orbit, skull base, paranasal sinuses, deep spaces of the neck, larynx, and lymph nodes, require that the radiologist be familiar with the imaging modalities available and their appropriate applications. The purpose of this article is to review the techniques of CT and MRI and the roles they play in clinical practice, including head and neck disorders.     

A Velocity k-Space Analysis of Flow Effects in Echo-Planar and Spiral Imaging

A velocity k-space formalism facilitates the analysis of flow effects for imaging sequences involving time-varying gradients such as echo-planar and spiral. For each sequence, the velocity k-space trajectory can be represented by k_v (k)_r; that is, its velocity-frequency (k_r) position as a function of spatial-frequency (k_r) position. In an echo-planar sequence, k_r is discontinuous and asymmetric. However, in a spiral sequence, k_r is smoothly varying, circularly symmetric, and small near the k_r origin. To compare the effects of these trajectory differences, simulated images were generated by computing the k-space values for an in-plane vessel with parabolic flow. Whereas the resulting echo-planar images demonstrate distortions and ghosting that depend on the vessel orientation, the spiral images exhibit minimal artifacts.     

CAIPIRINHA-Dixon-TWIST (CDT)-volume-interpolated breath-hold examination (VIBE) for dynamic liver imaging: Comparison of gadoterate meglumine,gadobutrol and gadoxetic acid

Purpose

CAIPIRINHA-Dixon-TWIST (CDT)-VIBE is a robust method for abdominal magnetic resonance imaging providing both high spatial and high temporal resolution. The purpose of this study was to examine the influence of different gadolinium based contrast agents (GBCA) on image quality (IQ) with CDT-VIBE.

Materials and methods

In this IRB-approved, retrospective, inter-individual comparison study, 86 patients scanned at 3T were included. Within 28 s, 14 high-resolution 3D datasets were acquired using CDT-VIBE. 37 patients received 0.1 mmol/kg gadoterate meglumine, 28 patients 0.1 mmol/kg gadobutrol, and 19 patients 0.1 mL/kg gadoxetic acid. Two blinded, board-certified radiologists assessed the image quality on a 5 point scale, as well as the number of hepatic arterial dominant (HAD) phases.

Results

Regardless of the GBCA utilized, CDT-VIBE resulted in good IQ in terms of best IQ achieved among all 14 datasets (gadobutrol 4.3, gadoterate meglumine 3.9, gadoxetic acid 3.7). With respect to worst IQ, the three groups showed statistically significant differences with gadobutrol receiving the highest rating (3.6) and gadoxetic acid the lowest (2.4) (gadoterate meglumine 3.0; 0.0014 < p < 0.0485). No statistically significant differences were found in the mean number of acquired HAD phases (gadobutrol 3.4, gadoterate meglumine 3.9, gadoxetic acid 3.1; 0.18 < p < 0.57).

Conclusion

Different gadolinium-based contrast agents can be utilized for dynamic liver imaging with CDT-VIBE resulting in good image quality.