Enhancing recovery and sensitivity studies in an unconventional tight gas condensate reservoir

The recovery factor from tight gas reservoirs is typically less than 15%, even with multistage hydrauhc tractunng stimulation. Such low recovery is exacerbated in tight gas condensate reservoirs, where the depletion of gas leaves the valuable condensate behind. In this paper, three enhanced gas recovery （EGR） methods including produced gas injection, CO2 injection and water injection are investigated to increase the well productivity for a tight gas condensate reservoir in the Montney Formation, Canada. The production performance of the three EGR methods is compared and their economic feasibility is evaluated. Sensitivity analysis of the key factors such as primary production duration, bottom-hole pressures, and fracture conductivity is conducted and their effects on the well production performance are analyzed. Results show that, compared with the simple depletion method, both the cumulative gas and condensate production increase with fluids injected. Produced gas injection leads to both a higher gas and condensate production compared with those of the CO2 injection, while waterflooding suffers from injection difficulty and the corresponding low sweep efficiency. Meanwhile, the injection cost is lower for the produced gas injection due to the on-site available gas source and minimal transport costs, gaining more economic benefits than the other EGR methods.

Estimation of enhanced low dose rate sensitivity mechanisms using temperature switching irradiation on gate-controlled lateral PNP transistor

The mechanisms occurring when the switched temperature technique is applied,as an accelerated enhanced low dose rate sensitivity(ELDRS)test technique,are investigated in terms of a specially designed gate-controlled lateral PNP transistor(GLPNP)that used to extract the interface traps(Nit)and oxide trapped charges(Not).Electrical characteristics in GLPNP transistors induced by ^(60)Co gamma irradiation are measured in situ as a function of total dose,showing that generation of Nit in the oxide is the primary cause of base current variations for the GLPNP.Based on the analysis of the variations of Nit and Not,with switching the temperature,the properties of accelerated protons release and suppressed protons loss play critical roles in determining the increased Nit formation leading to the base current degradation with dose accumulation.Simultaneously the hydrogen cracking mechanisms responsible for additional protons release are related to the neutralization of Not extending enhanced Nit buildup.In this study the switched temperature irradiation has been employed to conservatively estimate the ELDRS of GLPNP,which provides us with a new insight into the test technique for ELDRS.

Correlation of Enhancement Degree on Contrast-enhanced Ultrasound with Histopathology of Carotid Plaques and Serum High Sensitive C-Reactive Protein Levels in Patients Undergoing Carotid Endarterectomy

This study was undertaken to investigate the correlation of the enhancement degree on contrast-enhanced ultrasound(CEUS) with the histopathology of carotid plaques and the serum high sensitive C-reactive protein(hs-CRP) levels in patients undergoing carotid endarterectomy(CEA). Carotid CEUS was performed preoperatively in 115 patients who would undergo CEA, and the enhancement degree of the carotid plaques was evaluated by both the visual semiquantitative analysis and the quantitative time-intensity curve analysis. Serum hs-CRP levels were detected using the particle-enhanced immunoturbidimetric assay also before the operation. Additionally, the carotid plaque samples were subjected to histopathological examination postoperatively. The density of neovessels and the number of macrophages in the plaques were assessed by immunohistochemistry. The results showed that among the 115 patients, grade 0 plaque contrast enhancement was noted in 35 patients, grade 1 in 48 patients and grade 2 in 32 patients. The degree of plaque enhancement, the density of neovessels, the number of macrophages, and the hs-CRP levels were highest in the grade 2 patients. Correlation analysis showed that the enhancement degree of the carotid plaques was closely related to the immunohistochemical parameters of the plaques and the serum hs-CRP levels. It was suggested that the carotid plaque enhancement on CEUS can be used to evaluate the vulnerability of carotid plaques.

Delay enhancement patterns in apical hypertrophic cardiomyopathy by phase-sensitive inversion recovery sequence

Objective:Late gadolinium enhancement(LGE) patterns of cardiovascular magnetic resonance (CMR) relying on PSIR(phase-sensitive inversion recovery sequence) techniques had been used to determine the characteristics of LGE in apical hypertrophic cardiomyopathy(ApHCM). Methods:Forty patients pure ApHCM[age,(60.2±10.4) years,31 men]were enrolled.LGE images were acquired using PSIR,and analyzed using a 17-segment model.Summing the LGE areas in all short axis slices yielded the total volume of late enhancement,which was subsequently presented as a proportion of total LV myocardium(%LGE).Results:Mean maximal apical wall thickness was(17.9±2.3) mm,and mean left ventricular(LV) ejection fraction was(67.7±8.0)%.LGE was detected in 130 segments of 30 patients(75.0%),occupying(4.9±5.5)% of LV myocardium.LGE was mainly detected at the junction between left and right ventricles in 12(30%) and at the apex in 28(70%),although LGE-positive areas were widely distributed,and not limited to the apex.Focal LGE at the non-hypertrophic LV segments was found in some ApHCM patients,even without LGE of hypertrophied apical segments.Conclusions:LGE was frequently observed not only in the thickened apex of the heart but also in other LV segments,irrespective of the presence or absence of hypertrophy.The simple presence of LGE on CMR was not representative of adverse prognosis in this population.

Mass transfer investigation and operational sensitivity analysis of aminebased industrial CO_2 capture plant

In this article, the industrial process of CO_2 capture using monoethanolamine as an aqueous solvent was probed carefully from the mass transfer viewpoint. The simulation of this process was done using Rate-Base model, based on two-film theory. The results were validated against real plant data. Compared to the operational unit, the error of calculating absorption percentage and CO_2 loading was estimated around 2%. The liquid temperature profiles calculated by the model agree well with the real temperature along the absorption tower, emphasizing the accuracy of this model. Operational sensitivity analysis of absorption tower was also done with the aim of determining sensitive parameters for the optimized design of absorption tower and optimized operational conditions. Hence,the sensitivity analysis was done for the flow rate of gas, the flow rate of solvent, flue gas temperature, inlet solvent temperature, CO_2 concentration in the flue gas, loading of inlet solvent, and MEA concentration in the solvent. CO_2 absorption percentage, the profile of loading, liquid temperature profile and finally profile of CO_2 mole fraction in gas phase along the absorption tower were studied. To elaborate mass transfer phenomena, enhancement factor, interfacial area, molar flux and liquid hold up were probed. The results show that regarding the CO_2 absorption, the most important parameter was the gas flow rate. Comparing liquid temperature profiles showed that the most important parameter affecting the temperature of the rich solvent was MEA concentration.

Diagnostic sensitivity of imaging modalities for hepatocellular carcinoma smaller than 2 cm

AIM:To compare the imaging results with histology and to evaluate the diagnostic sensitivity of imaging modalities for hepatocellular carcinoma(HCC)smaller than 2 cm.METHODS:Nodules smaller than 2 cm(n=34)revealed by ultrasonography(US)in 29 patients with liver cirrhosis were analyzed.Histological diagnosis of HCC was performed by ultrasonographic guidance:moderately-differentiated HCC(n=24);well-differentiated HCC(n=10).The patterns disclosed by the four imaging modalities defined the conclusive diagnosis of HCC:(1)contrast-enhanced computed tomography(CECT),hypervascularity in the arterial phase and washout in the equilibrium phase;(2)Sonazoid contrast-enhanced US(CEUS),hypervascularity in the early vascular phase and defect in the Kupffer phase;(3)gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid(Gd-EOBDTPA)-enhanced magnetic resonance imaging(MRI),hypervascularity in the arterial phase and/or defect in the hepatobiliary phase;and(4)CT arterioportal angiography:hypervascularity by CT during arteriography and/ or perfusion defect by CT during arterial portography.RESULTS:Overall,the sensitivity of diagnosing HCC smaller than 2 cm was 52.9%(18/34)(95%CI:35.170.2)by CECT;67.6%(23/34)(95%CI:49.5-82.6)by Sonazoid CEUS;76.5%(26/34)(95%CI:58.8-89.3) by Gd-EOB-DTPA MRI;and 88.2%(30/34)(95%CI: 72.5-96.7)by CT arterioportal angiography.The diagnostic sensitivity of detecting moderately-differentiated HCC by CECT,Sonazoid CEUS,Gd-EOB-DTPA MRI and CT arterioportal angiography was 62.5%(15/24)(95%CI: 40.6-81.2),79.2%(19/24)(95%CI:57.8-92.9),75.0% (18/24)(95%CI:53.3-90.2)and 95.8%(23/24)(95% CI:78.9-99.9),respectively.A significant difference(P< 0.05)was observed between CECT and CT arterioportal angiography in all nodules.There was no difference between Sonazoid CEUS,Gd-EOB-DTPA MRI,and CT arterioportal angiography.The combined sensitivity of Sonazoid CEUS and Gd-EOB-DTPA MRI was 94.1%(32/34).CONCLUSION:Changing the main diagnostic modality for HCC smaller than 2 cm from CT arterioportal angiography to Sonazoid CEUS and Gd-EOB-DTPA MRI is recommended.

Exceptional-point-enhanced sensing in an all-fiber bending sensor

An exceptional-point(EP)enhanced fiber-optic bending sensor is reported.The sensor is implemented based on paritytime(PT)-symmetry using two coupled Fabry-Perot(FP)resonators consisting of three cascaded fiber Bragg gratings(FBGs)inscribed in an erbium-ytterbium co-doped fiber(EYDF).The EP is achieved by controlling the pumping power to manipulate the gain and loss of the gain and loss FP resonators.Once a bending force is applied to the gain FP resonator to make the operation of the system away from its EP,frequency splitting occurs,and the frequency spacing is a nonlinear function of the bending curvature,with an increased slope near the EP.Thus,by measuring the frequency spacing,the bending information is measured with increased sensitivity.To achieve high-speed and high-resolution interrogation,the optical spectral response of the sensor is converted to the microwave domain by implementing a dual-passband microwave-photonic filter(MPF),with the spacing between the two passbands equal to that of the frequency splitting.The proposed sensor is evaluated experimentally.A curvature sensing range from 0.28 to 2.74 m^(−1) is achieved with an accuracy of 7.56×10^(−4 )m^(−1 )and a sensitivity of 1.32 GHz/m^(−1),which is more than 4 times higher than those reported previously.

干热岩压裂储层布井方式优选数值模拟

增强型地热系统(EGS)是从干热岩储层中提取热能的重要手段,而布井方式是影响其采热效果的关键因素,目前开展的布井方式研究较少考虑压裂储层开采模型的影响。建立了干热岩压裂储层采热的数值模型,通过不同位置的基质岩体温度下降幅度、热提取率、采出温度和采热功率对比分析了4种不同的布井方式对EGS采热性能的影响。结果表明:相较于直井,水平井的流体热交换的面积更大,能充分开发裂缝间的热量。在生产30 a时,考虑水力压裂裂缝连通的情况下,水平井一注两采模型的采热效率最高,其在垂直于井方向上温度波及范围约690 m,基质岩体平均温度下降38.09 K,热提取率为24.42%,采热功率为3.5 MW。研究成果为提高地热系统产热量、实现干热岩高效可持续开发提供了理论参考。

频率可调谐太赫兹回旋管研究

频率可调太赫兹回旋管在太赫兹增强核磁共振等方面有广泛的应用。论文对自研的频率可调基波太赫兹回旋管、频率可调谐波太赫兹回旋管,以及多模频率可调太赫兹回旋管做了详细介绍。发展的频率可调太赫兹回旋管最高工作频率为660 GHz,连续波功率百瓦量级。基于自研的频率可调太赫兹回旋管和大功率太赫兹传输线,实现了太赫兹增强核磁共振系统,对1 H实现了350倍灵敏度增强,对13 C实现了88倍灵敏度增强。

EHDE和WHO-SVM模型在齿轮箱故障诊断中的应用

针对现有齿轮箱故障诊断方法对数据长度敏感的缺陷,提出了一种基于增强层次多样性熵(EHDE)和野马算法(WHO)优化支持向量机(SVM)的齿轮箱故障诊断模型。首先,传统熵值特征提取方法在特征提取阶段对数据样本的长度比较敏感,为此提出了增强层次多样性熵,并将其作为特征提取指标用于提取齿轮箱的故障特征;其次,采用WHO算法对SVM模型的参数进行了优化,建立了参数最优的WHO-SVM分类器;最后,将故障特征样本输入至WHO-SVM分类器中进行了训练和识别,完成了样本的故障识别;利用齿轮箱数据集分别从数据长度敏感性、算法特征提取时间、模型诊断性能三种角度对EHDE、精细复合多尺度样本熵、精细复合多尺度模糊熵、精细复合多尺度排列熵、精细复合多尺度散布熵、精细复合多尺度波动散布熵进行了对比研究。研究结果表明:EHDE方法对数据长度的要求较低,在数据长度为512时即可以取得99.1%的平均识别准确率,在诊断稳定性和诊断精度方面均优于其他对比方法;在算法的泛化性实验中,EHDE方法能够以98%的准确率识别齿轮箱的不同故障类型,具有明显的泛化性和通用性。

准噶尔盆地东部北10井区中深层稠油CO_(2)非混相驱油技术

准噶尔盆地东部北10井区头屯河组油藏具有埋藏深、原油黏度大、储层强水敏的特点,自探明以来一直未获得有效动用。为了解决油藏难动用的难题进行了CO_(2)-稠油实验,在实验结果的基础上,根据试验区生产现状提出“非混相驱+吞吐”措施,利用数值模拟手段优化生产参数得到最优方案并预测出生产指标。结果表明:地层稠油注入CO_(2)后原油体积膨胀和黏度降低的能力大幅增强,是提高采收率的主要机理;井区稠油CO_(2)驱替方式为非混相驱,驱替过程中CO_(2)先以溶解和扩散作用为主,待建立驱替通道后才开始产出原油,采收率为29.60%;试验区非混相驱初期见效慢,为加快受效提出“油井吞吐”措施,数值模拟预测非混相驱配合3轮油井吞吐生产,最终采收率可达21.0%,解决了研究区油藏难动用的难题。研究成果对中深层强水敏稠油油藏的动用具有一定的借鉴意义。

纳米抗体多聚化测略提升间接竞争性酶联免疫吸附实验检测黄曲霉毒素M_(1)的灵敏度

酶联免疫吸附实验(enzyme-linked immunosorbent assay,ELISA)具有高通量、操作简单、检测结果明显等优点,是一种较为理想的检测食品中真菌污染物的免疫分析技术。然而,传统的ELISA方法具有较大的局限性,比如使用时抗体易受温度影响,容易变性,贮存期短,易受到检测环境中其他物质干扰而造成假阳性或假阴性等。该实验使用实验室前期获得的抗黄曲霉毒素M_(1)(aflatoxin M_(1),AFM_(1))纳米抗体(nanobody-M4,Nb-M4)与C4结合蛋白(recombinant C4 binding protein alpha,C4BPa)C端片段融合形成自组装七聚体融合蛋白(Nb-M4-C4 bpα),并基于该七聚体开发应用于乳制品中AFM_(1)的间接竞争酶联免疫吸附法(indirect competitive enzyme-linked immunosorbent assay,icELISA)。在最佳实验参数下,AFM_(1)的IC_(50)为0.038 ng/mL,检测限为0.009 ng/mL,较单体Nb-M4的提高了8.63倍和5.56倍。与AFM_(1)类似物和其他常见真菌毒素的交叉反应可忽略不计,且在加标乳样中获得了良好的回收率和可重复性。此外,将所开发的方法应用于实际样品中AFM_(1)的分析,结果与HPLC的结果具有很好的相关性(R^(2)=0.995)。该研究表明,自组装的七聚化纳米抗体是改善亲和力和信号放大的有效策略,今后可用于灵敏、选择性和快速检测食品中的霉菌毒素和其他小分子污染物。

LCST型温度敏感聚合物的研究及其在钻井液领域的应用进展

低临界溶解温度(LCST)型温度敏感聚合物是指聚合物链在相转变温度前呈伸展溶解态、相转变温度后为收缩聚集态的温度敏感型聚合物,其在环境温度变化刺激下能智能且可逆响应,已在有机化工、材料科学、生物医学和石油天然气工业等领域得到了广泛研究。该文对不同空间构象的LCST型温度敏感聚合物进行了分类,重点介绍了线形结构、温敏水凝胶、嵌段结构、接枝复合结构和特殊结构的LCST型温度敏感聚合物的研究进展;总结了不同空间构象的LCST型温度敏感聚合物在低温流变调控、温敏智能封堵、增黏提切和防漏堵漏钻井液领域的应用现状,提出了LCST型温度敏感聚合物存在的关键问题及其在钻井液领域的应用前景。

数字图像混沌序列抽样加权强置乱算法仿真

数字图像置乱关系到个人隐私和信息安全问题,为了保护图像中的敏感信息,提出一种基于位交换和混沌优化的数字图像置乱算法。使用散列函数获得数字图像明文的密钥流,采用与明文相关的子密钥推导像素初始值,通过非线性交叉生成位交换算子,增强明文信息敏感性;运用Logistic方程得到混沌序列,引入抽样加权方法提高图像置乱强度,采用混合蛙跳方法按照族群划分实施信息传输,将混沌序列内的实数从小到大排列,初始混沌抽样后构成的混沌序列用于图像中,显著提升图像置乱强度,完成数字图像置乱。仿真结果表明,上述方法拥有极高的安全性和优秀的加密性能,可以为数字图像在各领域的安全使用提供可靠借鉴。

心脏延迟增强MRI不同TI值对心肌梗死诊断效能的影响

目的:通过与TI值为300 ms的常规相位敏感反转恢复(PSIR)序列进行比较,探讨调整TI值为左室血池过零时PSIR序列心脏延迟增强MRI对心肌梗死的诊断效能。方法:将2022年3月-2022年12月在本院确诊为心肌梗死的35例患者纳入本研究。所有患者在静脉注射Gd-DTPA后10 min分别采用300 ms和血液过零时的TI值行PSIR序列延迟增强(LGE)扫描,扫描平面包括两腔心、四腔心及通过病变区的短轴位。测量并比较2种TI值LGE图像上正常心肌、心肌疤痕与心腔内血液的SNR、CNR和信号强度(SI)的差异及心肌梗死范围的差异。结果:调整TI后LGE图像上心肌疤痕区域与左心室血池的CNR[24.58(16.80,48.51)vs.11.83(5.04,22.73),Z=-6.87,P<0.05]更高,并能显示更大的梗死面积[4.20(2.10,7.55)mm^(2) vs.3.45(1.40,6.15)mm^(2),Z=-6.65,P<0.05],且有更高的疤痕-血池信号强度差[366.80(258.75,432.60)vs.175.90(73.30,259.35),Z=-8.13,P<0.05],更低的正常心肌-血池信号强度差[284.70(196.05,405.20)vs.511.20(394.55,636.70),Z=-8.07,P<0.01]。结论:调整TI后的PSIR序列心脏延迟增强扫描可以有效抑制心腔内血池信号,提高心肌疤痕与血池的对比,而且心内膜下和乳头肌的强化更明显而显示更清晰,从而可提高对梗死区域内心肌活性的检测敏感度。

经皮吸收促进剂用量对压敏胶黏附性的影响

目的探讨经皮吸收促进剂(简称促透剂)用量对透皮贴剂中压敏胶黏附性的影响。方法选择Plurol■Oleique CC497为模型促透剂,两种不同内聚力聚丙烯酸酯压敏胶为模型压敏胶,制备不同促透剂用量的贴剂,测定初黏力、持黏力、180°剥离强度和流变学参数。利用调制差示扫描量热法测定压敏胶玻璃化转变温度;利用红外光谱分析促透剂与压敏胶的相互作用机制。结果随着促透剂用量的增加,两种压敏胶初黏力提高,持黏力下降,高内聚力压敏胶在高促透剂用量下黏附性能仍较好。促透剂的加入会降低压敏胶的玻璃化转变温度,增加压敏胶分子流动性。红外光谱结果显示,Plurol■Oleique CC497与压敏胶间可能发生氢键作用,破坏了压敏胶聚合物分子间的相互作用,使黏附力发生变化。结论促透剂的加入会增加压敏胶的黏附性失效风险,在高促透剂用量下,应选择高内聚力压敏胶制备透皮贴剂。

SiO_(2)增强自敏性氮化碳微球可见光降解盐酸四环素的研究

光催化技术在水中新型污染物的治理中应用广泛。自敏性氮化碳(SSCN)是一种新型非金属光催化剂,其表面的自敏性高分子可以有效地拓宽可见光吸收范围,但该材料存在严重的团聚现象,抑制了其光催化活性和稳定性。SiO_(2)的分散性好,被广泛用作载体构建复合结构应用于光催化领域。本研究首先用Stöber法制备了SiO_(2)微球,随后利用水热法原位合成了SiO_(2)/SSCN复合材料。采用多种表征手段分析样品的物相结构、微观形貌、光电性能。制备的复合材料在光催化降解水中盐酸四环素中表现出增强的降解活性,其活性与SiO_(2)加入量密切相关,当SiO_(2)与SSCN的质量比为0.04∶1时,复合材料的光催化活性和稳定性最佳,光照60 min可降解42%的盐酸四环素,经5次循环后其光催化降解效率仍然能够维持约38%。引入的SiO_(2)为SSCN提供了分散位点,改善了SSCN较为严重的团聚现象,使SSCN表面的1,3,5-三嗪基低聚物(TBO)快速分解后达到表面活性位点暴露的最佳含量,提升了SSCN对可见光的利用率,促进了光生电荷的分离效率,从而有效地提升了SSCN的光催化活性及稳定性。本研究为提高催化剂的光催化活性和稳定性及治理新型污染物提供了一个新思路。

顺北油田断控缝洞型凝析气藏衰竭式开采特征及保压开采对策

顺北油田断控缝洞型凝析气藏具有特殊的地质条件,开采难度大。基于顺北油田气藏实际参数,采用建模-数模一体化定量分析方法,对断控缝洞型凝析气藏的衰竭式开采特征进行了刻画,并制定了相应的保压开采对策。研究结果表明:(1)针对不同的介质相类型,采用地球物理属性雕刻的分级建模方法,得到融合的三维储集体模型;基于波阻抗、测井数据、试井解释数据,采用人机交互、逐级嵌套的构建方法得到三维孔渗模型;结合由流体高压物性实验拟合得到的流体模型,可得到代表地区特征的断控缝洞凝析气藏多组分数值模拟模型。(2)反凝析作用、应力敏感性是制约此类凝析气藏衰竭开发效果的两大因素:反凝析作用使油的稳产时间缩短、气油比变大、累产油减少;应力敏感性储层在一定应力作用下裂缝可能发生闭合,导致部分与裂缝连通的储量无法动用。(3)CH_(4)是保压开发的最优注入介质,以略高于露点压力进行保压补能,其增油效果最好;注采速度和注入时间均与增油量呈正相关关系,但换油率随注入量的增加而减小;对于井组单元采用先持续注采、后脉冲注持续采的方式,其防窜增油效果最好,对于孤立的井单元可采用单井吞吐注采方式提高凝析油采收率;注入井和采出井部署在同一洞内有利于对洞内储量的定向驱替,保证注采井间有足够距离,有利于预防气窜和增加波及范围。

基于DFT的频率敏感双分支Transformer多变量长时间序列预测方法

在进行多变量长时间序列预测时,仅利用时域分析通常无法充分捕捉长时间序列依赖,而这会导致信息利用率不足、预测精度不够高。因此,结合频域时域分析,提出一种基于离散傅里叶变换(DFT)的频率敏感双分支多变量长时间序列预测(FSDformer)方法。首先,通过DFT实现时间和频率的相互转换,从而将复杂的时间序列数据分解为结构简单的低频趋势项、中频季节项和高频余项3个分量;其次,采用双分支结构,针对中高频分量预测,应用Encoder-Decoder结构,设计了周期性增强注意力机制;针对低频趋势分量预测,采用多层感知机(MLP)结构;最后将中高频分量与低频分量预测结果相加,得到多变量长时间序列的最终预测结果。在2个数据集上把FSDformer与其他5个经典算法进行了对比分析,在Electricity数据集上,当历史序列长度为96,预测序列长度为336时,相较于Autoformer等对比算法,FSDformer的平均绝对误差(MAE)下降了11.5%~29.1%,均方误差(MSE)下降了20.9%~43.7%,达到了最优预测精度。实验结果表明,FSDformer能有效捕捉长时间序列的相关依赖,在提升预测精度和计算效率的同时,增强了模型预测的稳定性。

CT增强扫描和MRI检查在原发性肝癌患者诊断中的应用价值比较

目的分析CT增强扫描和磁共振成像(magnetic resonance imaging,MRI)检查诊断原发性肝癌(hepatic cell carcinoma,HCC)的价值。方法选取2022年4月—2023年4月丹江口市第一医院收治的96例疑似HCC患者。均接受CT增强扫描、MRI检查,以病理检查为“金标准”,分析2种方法诊断HCC的价值。结果96例疑似HCC患者中,“金标准”共检出67例,MRI共检出66例,CT增强扫描共检出58例;MRI诊断HCC的敏感度为97.01%(65/67)、准确度为96.88%(93/96)、阴性预测值为93.33%(28/30),高于CT增强扫描的83.58%(56/67)、86.46%(83/96)、71.05%(27/38),差异有统计学意义(P<0.05);Kappa检验显示,MRI与“金标准”的一致性极好(Kappa=0.927,P<0.001);CT增强扫描与“金标准”的一致性中等(Kappa=0.705,P<0.001)。结论与CT增强扫描相比,MRI诊断准确率较高,此文的研究结果为HCC后期诊断标准制定提供了有关的借鉴内容,存有一定的诊断效能。