Diffusion weighted imaging in the liver

Diffusion weighted magnetic resonance imaging (DWI) is an imaging technique which provides tissue contrast by the measurement of diffusion properties of water molecules within tissues. Diffusion is expressed in an apparent diffusion coefficient (ADC), which reflects the diffusion properties unique to each type of tissue. DWI has been originally used in neuroradiology. More recently, DWI has increasingly been used in addition to conventional unenhanced and enhanced magnetic resonance imaging (MRI) in other p...     

磁共振弥散加权成像联合增强扫描在肝脏良恶性病变鉴别诊断中的价值探讨

目的探讨磁共振弥散加权成像(DWI)联合增强扫描在肝脏良恶性病变鉴别诊断中的价值。方法对38例肝细胞癌、26例肝血管瘤、20例肝转移瘤行磁共振DWI联合增强扫描检查,比较各组ADC值和诊断准确率。结果肝细胞癌ADC值[(1.18±0.23)×10-3mm2/s]与肝转移瘤ADC值[(1.24±0.27)×10-3mm2/s]比,差异无统计学意义(P0.05),但它们均明显低于肝血管瘤ADC值[(1.65±0.31)×10-3mm2/s,P0.05];DWI联合MR增强扫描诊断肝血管瘤的准确率(100.0%)明显高于肝细胞癌(92.1%)或肝转移瘤(85.0%,P0.05)。结论 MR DWI在肝脏良恶性病变鉴别诊断中具有重要的临床价值,结合MR增强扫描可明显提高诊断的准确率。     

磁共振弥散加权成像联合LAVA技术诊断肝脏占位性病变的临床价值

目的探讨磁共振弥散加权成像(DWI)联合快速容积扫描(LAVA)技术诊断肝占位性病变的临床价值。方法采用DWI联合LAVA技术检查25例原发性肝癌、20例肝血管瘤和21例肝脏转移癌,比较各组DWI ADC值、信号增强比值(SER)、最大下降斜率(MSD)、正性增强积分(PEI)、最大上升斜率(MSI)和峰值(PV)等相关指标,比较诊断的准确性。结果肝血管瘤ADC值[(2.34±0.28)×10-3mm2/s]明显高于原发性肝癌[(1.27±0.25)×10-3mm2/s]和肝脏转移癌[(1.32±0.24)×10-3mm2/s,P0.05];肝血管瘤患者MSI(362.4±68.1)、PV(583.6±74.4)、MSD(97.6±42.8)和PEI(285.8±47.0)明显高于肝转移癌和原发性肝癌(P0.05),原发性肝癌患者MSI(285.2±78.7)、PV(496.8±72.2)、MSD(85.2±37.8)和PEI(234.9±72.4)明显高于肝转移癌[分别为(267.5±72.6)、(404.4±68.3)、(73.4±34.2)和(202.6±84.1),P0.05],而三组SER比较,无显著性差异(P0.05);原发性肝癌Ⅰ型曲线(68.0%)显著高于肝血管瘤(10.0%)和肝转移癌(0.0%,P0.05),肝脏转移癌Ⅱ型曲线(76.2%)高于原发性肝癌(20.0%)和肝血管瘤(20.0%)(P0.05),肝血管瘤Ⅲ型曲线(70.0%)高于肝转移癌(23.8%)和原发性肝癌(12.0%,P0.05);DWI联合LAVA增强扫描对各种肝占位性病变的诊断准确率(100.0%)均明显高于两单项检查(P0.05)。结论 DWI和LAVA联合检查可明显提高肝占位性病变的诊断正确率。     

单双指数模型扩散加权成像在肝脏病变评价中的应用进展

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磁共振功能弥散成像对肝脏早期弥漫性病变诊断价值的实验研究

目的探讨磁共振(MR)功能弥散成像(DWI)对早期肝脏弥漫性病变的诊断价值。方法用二乙基亚硝胺诱导大鼠肝脏病变,对其早期阶段(给药后1-14周)的弥漫性改变进行动态磁共振常规形态学成像(包括T1加权、T2加权和常规MR增强扫描)和DWI,并作组织学检查,与正常大鼠比较。结果两组大鼠肝脏的常规形态MR相比无明显差异,而DWI显示了实验组大鼠肝脏早期肝硬化的不均质性改变,表现为相应肝叶的片状信号增高。正常组各周间肝实质的表观弥散系数(ADC)值无明显差异;实验组自第5周ADC值开始下降。当悌度因子(b)为300 s/mm2时,正常组与实验组间以及实验组第10周与第1周和第9周间ADC值差异有统计学意义(P<0.05);当b=600 s/mm2和1 000 s/mm2时,自第6周正常组与实验组间以及实验组第6周与第1周和第5周间ADC值变化显示出明显差异(P<0.01)。病理组织学检查显示实验组1-4周大鼠肝脏的病理改变是以肝细胞肿胀为主,为肝炎阶段,5-8周则属于以肝实质内纤维组织增生为主的肝纤维化阶段,9-14周已进展为肝硬化阶段,实质内有许多纤维分割不完整或完整的增生性结节形成。结论MR功能弥散成像较形态结构影像能更早的反映肝脏弥漫性病变,动态ADC值的测定有助于肝脏早期弥漫性病变的诊断和病变进展的监测。     

磁共振增强扫描弥散加权成像对肝脏良恶性肿瘤的鉴别诊断价值研究

目的 探讨磁共振增强扫描联合扩散加权成像(DWI)对肝脏良恶性病变鉴别诊断的临床价值.方法 在80例肝脏局灶性病变患者接受3.0T磁共振成像(MRI)增强和DWI序列扫描,并接受手术治疗.以组织病理学检查结果为"金标准",评估MRI和DWI的诊断效能.结果 在本组80例肝脏局灶性病变患者中,术后组织病理学诊断肝细胞癌2...     

Multiparameter magnetic resonance imaging of liver fibrosis in a bile duct ligation mouse model

BACKGROUNDBile duct ligation (BDL) in animals is a classical method for mimicking cholestatic fibrosis. Although different surgical techniques have been described in rats and rabbits, mouse models can be more cost-effective and reproducible for investigating cholestatic fibrosis. Magnetic resonance imaging (MRI) has made great advances for noninvasive assessment of liver fibrosis. More comprehensive liver fibrotic features of BDL on MRI are important. However, the utility of multiparameter MRI to detect liver fibrosis in a BDL mouse model has not been assessed.AIMTo evaluate the correlation between the pathological changes and multiparameter MRI characteristics of liver fibrosis in a BDL mouse model.METHODSTwenty-eight healthy adult male balb/c mice were randomly divided into four groups: sham, week 2 BDL, week 4 BDL, and week 6 BDL. Multiparameter MRI sequences, included magnetic resonance cholangiopancreatography, T1-weighted, T2-weighted, T2 mapping, and pre- and post-enhanced T1 mapping, were performed after sham and BDL surgery. Peripheral blood and liver tissue were collected after MRI. For statistical analysis, Student’s t-test and Pearson’s correlation coefficient were used.RESULTSFour mice died after BDL surgery; seven, six, five and six mice were included separately from the four groups. Signal intensities of liver parenchyma showed no difference on TI- and T2-weighted images. Bile duct volume, ΔT1 value, T2 value, and the rate of liver fibrosis increased steadily in week 2 BDL, week 4 BDL and week 6 BDL groups compared with those in the sham group (P < 0.01). Alanine aminotransferase and aspartate transaminase levels initially surged after surgery, followed by a gradual decline over time. Strong correlations were found between bile duct volume (r = 0.84), T2 value (r = 0.78), ΔT1 value (r = 0.62), and hepatic fibrosis rate (all P < 0.01) in the BDL groups.CONCLUSIONThe BDL mouse model induces changes that can be observed on MRI. The MRI parameters correlate with the hepatic fibrosis rate and allow for detection of cholestatic fibrosis.     

Imaging findings of inflammatory pseudotumor-like follicular dendritic cell tumors of the liver:Two case reports and literature review

BACKGROUND Inflammatory pseudotumor-like follicular dendritic cell(IPT-like FDC) tumors of the liver is an uncommon tumor with extremely low incidence.To date,the radiologic findings of this tumor in multiphase computed tomography(CT) and magnetic resonance imaging(MRI) imaging have not been described.CASE SUMMARY Patient 1 is a 31-year-old Chinese female,whose complaining incidentally coincided with the finding of multiple liver masses.In the local hospital,an abdominal enhanced CT found two hypo-dense solid lesions,with heterogeneous sustained hypoenhancement,in the upper segment of the liver's right posterior lobe.In our hospital,enhanced magnetic resonance imaging(MRI) with hepatocyte-specific contrast agents showed a similar enhanced pattern of lesions with patchy hyperintensity in the hepatobiliary phase(HBP).The patient underwent surgery and recovered well.The final pathology confirmed an IPTlike FDC tumor.No recurrence was found on the regular re-examination.Patient2 is a 48-year-old Chinese male admitted to our hospital for a huge unexpected hepatic lesion.A dynamic enhanced abdominal CT revealed a huge heterogeneous enhanced solid tumor in the right lobe of the liver with a size of100 mm × 80 mm,which showed a heterogeneous sustained hypoenhancement.In addition,enlarged lymph nodes were found in the hilum of the liver.This patient underwent a hepatic lobectomy and lymph node dissection.The final pathology confirmed an IPT-like FDC tumor.No recurrence was found upon regular re-examination.CONCLUSION When a hepatic tumor shows heterogeneous sustained hypoenhancement with a patchy enhancement during HBP,an IPT-like FDC tumor should be considered in the differential diagnosis.     

磁共振扩散加权成像对肝癌的诊断及鉴别诊断作用

目的:探讨磁共振扩散加权成像对肝癌诊断及鉴别诊断的作用.方法:选取肝脏占位性病变88例,其中原发性肝细胞癌28例,转移瘤15例,肝血管瘤33例,肝囊肿12例.应用不同的b值分别行轴位扩散加权成像扫描,在拟合出的ADC图上分别测出ADC值并进行统计分析.结果:随着b值或b值差的增大,肝脏占位病变的ADC值明显减小,而且波动范围减小,b值越大时越接近实际DC值.采用b值差为500时各组病变的ADC值作为肝脏占位病变的ADC平均值.肝囊肿(3.24±0.68)ADC值明显高于原发性肝癌(1.20±0.32)、血管瘤(2.01±0.53)和转移瘤(1.57±0.42)(P<0.01).血管瘤ADC值显著高于原发性肝癌(P<0.01)及转移瘤(P<0.05).转移瘤ADC值高于原发性肝癌,但无统计学意义(P>0.05).结论:ADC值的应用可大大提高MRI对肝癌的诊断和鉴别诊断能力.     

Prognostication and response assessment in liver and pancreatic tumors:The new imaging

Diffusion-weighted imaging(DWI), dynamic contrastenhanced magnetic resonance imaging(DCE-MRI) and perfusion computed tomography(CT) are technical improvements of morphologic imaging that can evaluate functional properties of hepato-bilio-pancreatic tumors during conventional MRI or CT examinations.Nevertheless, the term "functional imaging" is commonly used to describe molecular imaging techniques, as positron emission tomography(PET)CT/MRI, which still represent the most widely used methods for the evaluation of functional properties of solid neoplasms; unlike PET or single photon emission computed tomography, functional imaging techniques applied to conventional MRI/CT examinations do not require the administration of radiolabeled drugs or specific equipments. Moreover, DWI and DCE-MRI can be performed during the same session, thus providing a comprehensive "one-step" morphological and functional evaluation of hepato-bilio-pancreatic tumors. Literature data reveal that functional imaging techniques could be proposed for the evaluation of these tumors before treatment, given that they may improve staging and predict prognosis or clinical outcome. Microscopic changes within neoplastic tissues induced by treatments can be detected and quantified with functional imaging,therefore these techniques could be used also for posttreatment assessment, even at an early stage. The aim of this editorial is to describe possible applications of new functional imaging techniques apart frommolecular imaging to hepatic and pancreatic tumors through a review of up-to-date literature data, with a particular emphasis on pathological correlations,prognostic stratification and post-treatment monitoring.     

家兔肝纤维化模型的建立及三维全肝动态磁共振灌注成像对纤维化分期的量化价值

目的 探索家兔肝纤维化模型的建立方法,评价三维全肝动态磁共振灌注成像对肝纤维化分期量化研究的可行性及价值. 方法分别用5%CCl4油溶液和纯CCl4,按0.1 ml/kg剂量每周1次腹腔注射,并于6、8、10、12周分组行磁共振灌注成像检查,量化分析门静脉和肝实质的峰值时刻、达峰时间、信号上升最大斜率和最大相对信号增加率的变化规律并与病理结果对照.不同浓度CCl4造模对比采用卡方检验;实验组灌注参数的多组问比较采用单因素方差分析,组间两两比较采用最小显著差法. 结果 5%CCl4h浓度组和纯CCl4组成模率分别为40%和75%,两组家兔死亡率差异有统计学意义(χ2=5.013,P<0.05).31只家兔均顺利完成磁共振灌注成像检查,肝脏灌注的基线平稳,均得到了较满意的时间-信号强度曲线.随着肝纤维化程度的加重,门静脉和肝实质的峰值时刻南SO期的(22.62±1.80)s和(29.04±0.60)s上升至S4期的(39.84±0.44)s和(45.44±1.95)s;达峰时间由(11.06±0.92)S和(13.19±1.06)S上升至(25.57±0.36)S和(28.81±2.92)s;信号上升最大斜率由(322.49±88.13)/s和(191.79±60.00)/s下降至(147.97±40.83)/s和(70.20±10.59)/s;最大相对信号增加率由4.47%±0.63%和2.69%±0.36%下降至2.54%±0.30%0和1.20%0±0.16%,S0～S2期与S3、S4期差异均有统计学意义(P值均<0.01).结论 按0.1 ml/kg剂量纯CCl4每周1次腹腔注射,家兔肝纤维化成模率高.高质量的三维全肝动态磁共振灌注成像,能够对肝纤维化程度进行量化评估.     

Intra-individual comparison of therapeutic responses to vascular disrupting agent CA4P between rodent primary and secondary liver cancers

AIM To compare therapeutic responses of a vascular-disrupting-agent, combretastatin-A4-phosphate(CA4 P), among hepatocellular carcinomas(HCCs) and implanted rhabdomyosarcoma(R1) in the same rats by magneticresonance-imaging(MRI), microangiography and histopathology.METHODS Thirty-six HCCs were created by diethylnitrosamine gavage in 14 rats that were also intrahepatically implanted with one R1 per rat as monitored by T2-/T1-weighted images(T2wI/T1wI) on a 3.0 T clinical MRIscanner. Vascular response and tumoral necrosis were detected by dynamic contrast-enhanced(DCE-) and CE-MRI before, 1 h after and 12 h after CA4P iv at 10 mg/kg(treatment group n = 7) or phosphate-buffered saline at 1.0 mL/kg(control group n = 7). Tumor blood supply was calculated by a semiquantitative DCE parameter of area under the time signal intensity curve(AUC30). In vivo MRI findings were verified by postmortem techniques.RESULTS On CE-T1wIs, unlike the negative response in all tumors of control animals, in treatment group CA4P caused rapid extensive vascular shutdown in all R1-tumors, but mildly or spottily in HCCs at 1 h. Consequently, tumor necrosis occurred massively in R1-tumors but patchily in HCCs at 12 h. AUC30 revealed vascular closure(66%) in R1-tumors at 1 h(P 0.05), followed by further perfusion decrease at 12 h(P 0.01), while less significant vascular clogging occurred in HCCs. Histomorphologically, CA4P induced more extensive necrosis in R1-tumors(92.6%) than in HCCs(50.2%)(P 0.01); tumor vascularity heterogeneously scored +~+++ in HCCs but homogeneously scored ++ in R1-tumors.CONCLUSION This study suggests superior performance of CA4P in metastatic over primary liver cancers, which could guide future clinical applications of vascular-disruptingagents.     

磁共振扩散峰度成像检测原发性肝癌及其周围组织参数分析

目的 探讨扩散峰度成像（DKI）检测原发性肝癌（PLC）及其周围组织参数变化。方法 2015年2月~2016年2月收治的PLC患者25例和健康人24例,行DKI扫描及常规MRI扫描,检测癌组织、癌周组织和远癌肝组织DKI参数。结果 正常人肝实质与远癌肝实质、癌周肝实质和PLC组织平均扩散系数（MD）MD分别为（2.1±0.2） mm/ms与（1.6±0.2） mm/ms、（1.6±0.1） mm/ms和（1.4±0.2） mm/ms,轴向扩散系数（Da）分别为（2.6±0.2） mm/ms与（2.1±0.） mm/ms、（2.2±0.3） mm/ms和（1.7±0.3） mm/ms,径向扩散系数（Dr）分别为（1.8±0.2） mm/ms与（1.3±0.2） mm/ms、（1.3±0.2） mm/ms和（1.1±0.3） mm/ms,显示出健康人显著大于PLC患者（P<0.05）。结论 PLC患者肝组织DKI检测的一些定量参数与健康人明显不同,其意义还有待于进一步探讨。     

MRI联合应用DWI和DCE扫描序列在发现肝癌切除术后肝内复发微小癌灶的价值分析

目的 探讨MRI弥散加权成像（DWI）与动态增强扫描（DCE）序列联合应用在肝细胞癌（HCC）患者手术切除术后检出复发微小肝癌（mHCC）的诊断价值。方法 在43例肝细胞癌患者手术切除术后行MRI、DWI和DCE扫描序列,以早期发现复发癌灶。结果 在术后1年,43例HCC患者中发现54个复发病灶;DWI联合DCE对复发的mHCC判断的敏感性、特异性和准确性分别为89.5%、97.1%和94.4%,DCE单独诊断的敏感性为63.2%,特异性为88.6%,准确性为79.6%,而DCE单独诊断复发mHCC的敏感性,特异性和准确性最低,分别是60.0%,67.7%和64.8%（P＜0.05）。结论 在MRI检查中应用DWI和DCE扫描序列联合检测能显著提高对复发的mHCC的发现率。     

MR diffusion-weighted imaging of rabbit liver VX-2 tumor

AIM: To investigate the implanting method of rabbit liver VX-2 tumor and its MR diffusion-weighted imaging (DWI) characteristics. METHODS: Thirty-five New Zealand rabbits were included in the study. VX-2 tumor was implanted subcutaneously in 14 rabbits and intrahepatically in 6 for pre-experiments. VX-2 tumor was implanted intrahepatically in 12 rabbits for experiment and three were used as the control group. DWI, T1- and T2-weighted of MRI were performed periodically in 15 rabbits for experiment before and after implantation. The distinction of VX-2 tumors on DWI was assessed by their apparent diffusion coefficient (ADC) values. The statistical significance was calculated by analysis of variance (ANOVA) of the randomized block design using SPSS10.0 software. RESULTS: The successful rate of subcutaneous implantation of VX-2 tumor was 29% (4/14) while that of intrahepatic implantation of it was 33% (2/6) in the preexperiment. The successful rate of intrahepatic implantation of VX-2 tumor in the experiment was 83% (10/12) and 15 tumors grew in 10 successfully implanted rabbits. The DWI signal of VX-2 tumor was high and became lower when the b value increased step by step. The signal of VX-2 tumor on the map of ADC was low. When the b value was 100 or 300 s/mm2, the ADC value of normal group and VX-2 tumor group was respectively 2.57±0.26, 1.73±0.31, 1.87±0.25 and 1.57±0.23 mm2/s. Their distinction was significant (F= 43.26, P<0.01), the tumor ADC value between b values 100 and 300 s/mm2 was significant (Tukey HSP,P<0.05) and the ADC value between VX-2 tumor and normal liver was also significant (Tukey HSP, P<0.01). VX-2 tumor developed quickly and metastasized early to all body, especially to the lung, liver, lymph nodes of mediastinum, etc. CONCLUSION: The DWI signal of rabbit VX-2 tumor has its characteristics on MR DWI and DWI plays an important role in diagnosing and discovering VX-2 tumor.     

Predicting liver metastasis of gastrointestinal tract cancer by diffusion-weighted imaging of apparent diffusion coefficient values

AIM: To determine if efficacy of chemotherapy on liver metastasis of gastrointestinal tract cancer can be predicted by apparent diffusion coefficient(ADC) values of diffusion-weighted imaging(DWI). METHODS: In total, 86 patients with liver metastasis of gastrointestinal tract cancer(156 metastatic lesions) diagnosed in our hospital were included in this study. The maximum diameters of these tumors were compared with each other before treatment, 2 wk after treatment, and 12 wk after treatment. Selected patients were classified as the effective group and the ineffective group, depending on the maximum diameter of the tumor after 12 wk of treatment; and the ADC values at different treatment times between the two groups were compared. Spearman rank correlation was used to analyze the relationship between ADC value and tumor diameter. Receiver operating characteristic curve(ROC curve) was used to analyze the ADC values before treatment to predict the patient's sensitivity and specificity degree of efficacy to the chemotherapy. RESULTS: There was no difference in age between the two groups and in maximum tumor diameter before treatment and 2 wk after treatment. However, after 12 wk of treatment, maximum tumor diameter in the effective group was significantly lower than that in the ineffective group(P 0.05). Before treatment, ADC values in the ineffective group were significantly higher than those in the effective group(P 0.05). There was no difference in ADC values between the effective and ineffective groups after 2 and 12 wk of treatment. However, ADC values were significantly higher after 2 and 12 wk of treatment compared to before treatment in the effective group(P 0.05). Spearman rank correlation analysis showed that ADC value before treatment and the reduced percentage of the maximum tumor diameter after 12 wk of treatment were negatively correlated, while the increase in the percentage of the ADC value 12 wk after treatment and the decrease in the percentage of the maximum tumor diameter were significantly positively correlated. The results of the ROC curve showed that ADC value with a chemotherapy ineffective threshold value of 1.14 × 10-3 mm2/s before treatment had a sensitivity and specificity of 94.3% and 76.7%, respectively. CONCLUSION: DWI ADC values can be used to predict the response of patients with liver metastasis of gastrointestinal tract cancer to chemotherapy with high sensitivity and relatively high specificity.     

基于Exchange血流动力学模型的MRI扫描参数诊断肝硬化临床价值分析*

目的 探讨MRI增强扫描Exchange血流动力学模型评估肝硬化患者病情的临床应用价值及其意义。方法 在60例慢性乙型肝炎和慢性丙型肝炎患者及30例健康体检者,均接受肝活检和肝脏DCE-MRI检查,通过检测双输入双室Exchange血流动力学模型得到参数指标,包括对比剂容积转运常数（Ktrans）、速度常数（Kep）、血管外细胞外间隙容积分数（Ve）、血浆容积分数（Vp）、肝动脉灌注指数（HPI）以及对比剂平均通过时间（MTT）、达峰时间（TTP）、血容量（BV）、血流量（BF）。结果 在60例患者中,经肝组织病理学检查,诊断为S1期3例,S2期3例,S3期1例和S4期53例;肝纤维化患者Ktrans和Ve指标较对照组显著降低（P<0.05）,而HPI、MTT、TTP水平较对照组显著升高（P<0.05）;ROC曲线分析显示Ktrans、HPI、MTT和TTP诊断肝硬化的效能较高（P<0.05）。结论 基于双输入双室Exchange血流动力学模型的DCE-MRI检查可得到多个定量参数,在诊断肝硬化方面具有良好的指导意义。     

Current and future applications of magnetic resonance imaging and spectroscopy of the brain in hepatic encephalopathy

Hepatic encephalopathy (HE) is a common neuro-psychiatric abnormality, which complicates the course of patients with liver disease and results from hepatocellular failure and/or portosystemic shunting. The manifestations of HE are widely variable and involve a spectrum from mild subciinical disturbance to deep coma. Research interest has focused on the role of circulating gut-derived toxins, particularly ammonia, the development of brain swelling and changes in cerebral neurotransmitter systems that lead to global CNS depression and disordered function. Until recently the direct investigation of cerebral function has been difficult in man. However, new magnetic resonance imaging (MRI) techniques provide a non-invasive means of assessment of changes in brain volume (coregistered MRI) and impaired brain function (fMRI), while proton magnetic resonance spectroscopy (1H MRS) detects changes in brain biochemistry, including direct measurement of cerebral osmolytes, such as myoinositol, glutamate and glutamine which govern processes intrinsic to cellular homeostasis, including the accumulation of intracellular water. The concentrations of these intracellular osmolytes alter with hyperammonaemia. MRS-detected metabolite abnormalities correlate with the severity of neuropsychiatric impairment and since MR spectra return towards normal after treatment, the technique may be of use in objective patient monitoring and in assessing the effectiveness of various treatment regimens.     

MRI诊断肝转移瘤的价值探讨

目的探讨脂肪抑制序列在肝脏转移瘤诊断中的价值。方法回顾分析37例有明确原发肿瘤伴有肝脏转移瘤的MRI资料。结果 37例患者T2WI序列发现转移灶201个,脂肪抑制序列发现转移灶236个,不需要增强扫描,仅补充脂肪抑制序列平扫就能发现其他序列未发现的35个病灶。结论在肝脏转移瘤的MRI检查方面,脂肪抑制序列优于T2WI序列。