Gd-EOB-DTPA 增强 MRI T1 mapping 鉴别不同分化程度肝细胞癌的价值

目的 探讨钆塞酸二钠(Gd-EOB-DTPA)增强MRI T1mapping技术对不同分化程度肝细胞癌(HCC)的鉴别诊断价值.方法 搜集2017年7月至2020年5月桂林医学院附属医院经手术病理证实为HCC患者48例共50个病灶,所有患者术前1个月内均进行过Gd-EOB-DTPA增强MRI扫描,采用可变多翻转角T1m...     

基于Gd-EOB-DTPA增强MRI的评分系统在肝功能评估中的应用

目的 探讨功能性肝脏显像评分(FLIS)在评价乙型肝炎后肝硬化患者的肝功能情况中的应用价值。方法 搜集行钆塞酸二钠(Gd-EOB-DTPA)增强MRI扫描的乙型肝炎后肝硬化患者104例,分别比较MRI肝功能评分与实验室相关生化指标(血清总胆红素、人血白蛋白、血浆凝血酶原时间)、MRI肝功能评分与Child-Pugh功能评分、MRI肝功能分级与Child-Pugh功能分级的相关性。结果 MRI肝功能评分与血清总胆红素、人血白蛋白、血浆凝血酶原时间分别为中度负相关、中度正相关、中度负相关(r=-0.64、0.43、-0.47);MRI肝功能评分与Child-Pugh肝功能评分为中度负相关(r=-0.47);MRI肝功能分级与Child-Pugh肝功能分级具有较好的一致性(Kappa=0.47)。结论 FLIS能较好地反映乙型肝炎后肝硬化患者肝功能情况,有望为患者的随访监测及个体化治疗提供一个稳定、可靠的方法。     

磁共振T1mapping在心脏疾病中的应用

心脏磁共振T1mapping技术能够直接定量心肌组织的T1值和细胞外间质容积分数(ECV),可以无创的评估许多不同的心脏疾病.尽管传统的钆剂延迟增强(LGE)技术能鉴别某些疾病状态下的局限性心肌纤维化,但对弥漫性心肌纤维化则并不可靠,而T1mapping技术则能够对LGE上不显示或显示不明显的心肌病变进行量化评估.本文简述了T1mapping技术在多种心脏疾病中的研究进展,在不同心肌病变(特别是弥漫性心肌纤维化)的定性评估和鉴别诊断上,利用T1mappping进行T1值和ECV定量检测可能是一种更加可靠和准确的方法.     

肝脏乏血供病变的Gd-EOB-DTPA MRI表现

由于肝脏乏血供病变的常规影像表现相似,故术前对病变的良恶性鉴别诊断有一定困难。MRI是肝脏病变诊断最有价值的成像方法,利用非特异性细胞外对比剂钆塞酸二钠（Gd-EOB-DTPA）在肝胆期可以被肝细胞特异性摄取的特点,能够提高病变的检出率和诊断准确性。就多种肝脏乏血供良恶性病变的病生理特点及Gd-EOB-DTPA的MR影像征象予以综述。     

Gd-EOB-DTPA增强MRC结合MRCP技术在胆管系统疾病诊断中的研究进展

胆管系统疾病是临床的常见病、多发病,早期精确诊断对改善患者预后意义重大。MRI具有软组织分辨率高、多序列成像的优点,在胆管系统疾病的诊断中发挥着重要作用。其中,磁共振胰胆管成像(MRCP)的临床应用广泛,但因其图像质量易受腹水、周围肠管背景信号的干扰,存在一定的局限性。近年来Gd-EOB-DTPA增强磁共振胆管成像(EOB-MRC)的应用,成为MRCP的有益补充,提升了MRI检查在胆管系统疾病的诊断效能。本文就EOB-MRC结合MRCP技术及其在胆管系统疾病中的应用进行综述。     

采用钆塞酸二钠增强MRI肝胆期信号强度评价肝脏功能的临床价值

目的 探讨钆塞酸二钠增强MRI肝胆期肝脏与脾脏信号强度(SI)比(LSC)、肝脏与门静脉SI比(LPC)及门静脉与脾脏SI比(PSC)评价肝硬化患者肝功能的临床价值。方法 选取接受钆塞酸二钠增强MRI检查的128例患者,依据肝功能分为对照组(41例)、Child-Pugh A组(53例)、Child-Pugh B组(26例)和Child-Pugh C组(8例)。记录肝胆期肝脏、门静脉及脾脏SI,并计算LSC、LPC、PSC。采用单因素方差分析比较各组诸SI比值间的差异;采用Spearman线性相关分析比较SI比值与肝功能评分的相关性。结果 LSC及LPC从对照组到Child-Pugh C组逐渐减低(P <0.001),PSC各组间差异无统计学意义。Child-Pugh评分与LSC及LPC呈中度负相关(r值分别为-0.514,-0.530,P均<0.001),MELD评分与LSC及LPC呈中度负相关(r值分别为-0.614,-0.620,P均<0.001)。结论 钆塞酸二钠增强MRI肝胆期LSC及LPC能够反映肝硬化患者肝功能损害的严重程度,可以作为评价肝功能的影像学指...     

微小肝细胞癌（≤1 cm）的Gd-EOB-DTPA增强MRI表现

目的：探讨直径≤1 cm微小肝细胞癌（mHCC）在钆塞酸二钠（Gd-EOB-DTPA）增强MRI的表现。方法：回顾性分析经病理证实45例mHCC的临床和影像资料,采用多个独立样本列表的χ2检验比较不同序列对mHCC的检出率。结果：45个病灶中,25个（55.6%）表现为典型的“快进快出”模式,11个（24.4%）无动脉期高强化（APHE）,20个（44.4%）无门脉期廓清（WO）,仅1个（2.2%）肝胆期（HBP）呈高信号。HBP低信号对mHCC的检出率最高（97.8%）,HBP与T1WI、T2WI、APHE+WO任一序列比较,其检出率差异具有统计学意义（Bonferroni校正,P<0.005）。DWI联合“APHE+WO”的病灶检出率为82.2%,HBP联合“APHE+WO”检出率为97.8%,HBP联合DWI的检出率为100%。HBP联合DWI的检出率优于DWI联合“APHE+WO”(P=0.010),HBP联合“APHE+WO”的检出率优于DWI联合“APHE+WO”(P=0.035)。结论：Gd-EOB-DTPA增强MRI肝胆期对mHCC的检出率非常高,肝胆期低信号联合...     

Gd-EOB-DTPA增强MRI定量评估肝脏储备功能的可行性研究

目的:以吲哚氰绿(ICG)15、Child-Pugh评分及终末期肝病模型(MELD)评分为金标准,评估Gd-EOB-DTPA增强MRI定量评估肝脏储备功能的可行性.方法:本研究纳入15例肝脏肿瘤患者及12例肝功能正常志愿者.所有受试者在术前(4周内)均进行了Gd-EOB-DTPA增强MRI检查、ICG清除试验、Child-Pugh评分及MELD评分,以肝细胞摄取率(HUI)作为评估肝脏储备功能的指标.采用Spearmanrank相关检验分析HUI与ICG15、Child-Pugh评分及MELD评分的相关性.结果:HUI与ICG15呈负相关(r=-0.718,P=0.003);HUI与Child-Pugh评分呈负相关(r=-0.663,P=0.007);HUI与MELD评分呈负相关(r=-0.711,P=0.003).12例小肝癌患者不同部位(肝左叶、右叶、尾叶)的HUI差异有统计学意义(P＜0.05)结论:Gd-EOB-DTPA增强MRI可以定量评估肝脏储备功能,并且能对不同叶段的肝脏储备功能进行分别描述.     

First clinical application of a novel T1 mapping of the whole brain

BackgroundThe aim of this study was to evaluate the reproducibility and clinical value of the novel single-shot T1 mapping method for rapid and accurate multi-slice coverage of the whole brain, described by Wang et al. 2015.MethodsAt a field strength of 3 Tesla, T1 mappings of 139 patients (51 of them without pathologic findings) and two repeats of five volunteers were performed at 0.5 mm in-plane resolution. Mean T1 values were determined in 18 manually segmented regions-of-interest without pathologic findings. Reproducibility of the repeated scans was calculated using mean coefficient of variations. Pathologies were grouped and separately evaluated.ResultsThe mean age of the cohort was 49 (range 1–95 years). T1 relaxation times for ordinary brain and pathologies were in accordance with the literature values. Intra- and inter-subject reproducibility was excellent, and mean coefficient of variations were 2.4% and 3.8%, respectively.DiscussionThe novel rapid T1 mapping method is a reliable magnetic resonance imaging technique for identifying and quantifying normal brain structures and may thus serve as a basis for assessing pathologies. The fast and parallel online calculation enables a comfortable use in everyday clinical practice. We see a possible clinical value in a large spectrum of diseases, which should be investigated in further studies.     

Gd-EOB-DTPA增强MRI对肝细胞癌的诊断价值

目的:探究Gd-EOB-DTPA增强MRI对肝细胞瘤(HCC)的诊断价值.方法:纳入因疑诊HCC行Gd-EOB-DTPA增强MRI检查的患者48例.将患者图像分成A、B两组,A组包括平扫图像和动态增强图像;B组包括平扫图像、动态增强图像及肝胆期图像.比较两位阅片者在两组图像下诊断HCC的敏感度、特异度、阳性预测值和阴性预测值,并进行统计学分析.结果:B组图像诊断所有HCC的敏感度及阴性预测值高于A组图像,差异有统计学意义(P＜0.05).B组图像诊断直径＞2.0 cm HCC的阴性预测值高于A组图像,差异有统计学意义(P＜0.05).两位阅片者诊断一致性好(Kappa值均＞0.70).结论:含肝胆期的Gd-EOB-DTPA增强MRI能提高HCC的诊断准确度.     

Myocardial T1 mapping with MRI: comparison of look-locker and MOLLI sequences

Purpose:

To evaluate the relationship between “Look‐Locker” (LL) and modified Look‐Locker Inversion recovery (MOLLI) approaches for T1 mapping of the myocardium.

Materials and Methods:

A total of 168 myocardial T1 maps using MOLLI and 165 maps using LL were obtained in human subjects at 1.5 Tesla. The T1 values of the myocardium were calculated before and at five time points after gadolinium administration. All time and heart rate normalizations were done. The T1 values obtained were compared to determine the absolute and bias agreement.

Results:

The precontrast global T1 values were similar when measured by the LL and by MOLLI technique (mean, 1004.9 ms ± 120.3 versus 1034.1 ms ± 53.1, respectively, P = 0.26). Postcontrast myocardial T1 time from LL was significantly longer than MOLLI from 5 to 25 min (mean difference, LL ‐ MOLLI was +61.8 ± 46.4 ms, P < 0.001). No significant differences in T1 values were noted between long and short axis measurements for either MOLLI or LL.

Conclusion:

Postcontrast LL and MOLLI showed very good agreement, although LL values are higher than MOLLI. Precontrast T1 values showed good agreement, however LL has greater limits of agreement. Short and long axis planes can reliably assess T1 values. J. Magn. Reson. Imaging 2011;. © 2011 Wiley Periodicals, Inc.     

T1 mapping联合常规MRI扫描方案评估膝关节软骨损伤

目的 评估在常规MRI扫描方案中加入T1 mapping成像能否提高对膝关节软骨损伤的诊断效能.方法 选取86例患者的88个膝关节接受了膝关节MRI检查和关节镜检查.MRI检查采用常规方案并加入T1 mapping成像.术前2位影像科医师对所有MRI检查图像进行一致的诊断,评估是否存在软骨损伤并进行软骨损伤MRI分级,...     

Myocardial T1 mapping: application to patients with acute and chronic myocardial infarction.

T(1) maps obtained with modified Look-Locker inversion recovery (MOLLI) can be used to measure myocardial T(1). We aimed to evaluate the potential of MOLLI T(1) mapping for the assessment of acute and chronic myocardial infarction (MI). A total of 24 patients with a first MI underwent MRI within 8 days and after 6 months. T(1) mapping was performed at baseline and at selected intervals between 2-20 min following administration of gadopentetate dimeglumine (Gd-DTPA). Delayed-enhancement (DE) imaging served as the reference standard for delineation of the infarct zone. On T(1) maps the myocardial T(1) relaxation time was assessed in hyperenhanced areas, hypoenhanced infarct cores, and remote myocardium. The planimetric size of myocardial areas with standardized T(1) threshold values was measured. Acute and chronic MI exhibited different T(1) changes. Precontrast threshold T(1) maps detected segmental abnormalities caused by acute MI with 96% sensitivity and 91% specificity. Agreement between measurements of infarct size from T(1) mapping and DE imaging was higher in chronic than in acute infarcts. Precontrast T(1) maps enable the detection of acute MI. Acute and chronic MI show different patterns of T(1) changes. Standardized T(1) thresholds provide the potential to dichotomously identify areas of infarction.     

Measuring hepatic functional reserve using T1 mapping of Gd-EOB-DTPA enhanced 3T MR imaging: A preliminary study comparing with 99mTc GSA scintigraphy and signal intensity based parameters

PurposeTo determine the utility of liver T1-mapping on gadolinium-ethoxybenzyl-diethylenetriamine-pentaacetic acid (Gd-EOB-DTPA) enhanced magnetic resonance (MR) imaging for the measurement of liver functional reserve compared with the signal intensity (SI) based parameters, technetium-99m-galactosyl serum albumin (^99mTc-GSA) scintigraphy and indocyanine green (ICG) clearance.Materials and methodsThis retrospective study included 111 patients (Child-Pugh-A 90; −B 21) performed with both Gd-EOB-DTPA enhanced liver MR imaging and ^99mTc-GSA (76 patients with ICG). Receiver operating characteristic (ROC) curve analysis was performed to compare diagnostic performances of T1-relaxation-time parameters [pre-(T1pre) and post-contrast (T1hb) Gd-EOB-DTPA], SI based parameters [relative enhancement (RE), liver-to-muscle-ratio (LMR), liver-to-spleen-ratio (LSR)] and ^99mTc-GSA scintigraphy blood clearance index (HH15)] for Child-Pugh classification. Pearson’s correlation was used for comparisons among T1-relaxation-time parameters, SI-based parameters, HH15 and ICG.ResultsA significant difference was obtained for Child-Pugh classification with T1hb, ΔT1, all SI based parameters and HH15. T1hb had the highest AUC followed by RE, LMR, LSR, ΔT1, HH15 and T1pre. The correlation coefficients with HH15 were T1pre 0.22, T1hb 0.53, ΔT1 −0.38 of T1 relaxation parameters; RE −0.44, LMR −0.45, LSR −0.43 of SI-based parameters. T1hb was highest for correlation with HH15. The correlation coefficients with ICG were T1pre 0.29, T1hb 0.64, ΔT1 −0.42 of T1 relaxation parameters; RE −0.50, LMR −0.61, LSR −0.58 of SI-based parameters; 0.64 of HH15. Both T1hb and HH15 were highest for correlation with ICG.ConclusionT1 relaxation time at post-contrast of Gd-EOB-DTPA (T1hb) was strongly correlated with ICG clearance and moderately correlated HH15 with ^99mTc-GSA. T1hb has the potential to provide robust parameter of liver functional reserve.