共查询到19条相似文献,搜索用时 140 毫秒
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目的总结乳腺肿块二维超声和彩色多普勒超声声像图特点。方法回顾性分析我院156例乳腺疾病患者二维超声和彩色多普勒超声的临床资料。结果156例患者乳腺超声检查肿块检出率为100%,病灶最小为0.42cm×0.35cm,最大为5.32cm×3.31cm。156例乳腺肿块患者中,良性者108例,恶性者48例。良性肿块诊断符合率为90.7%(98/108),恶性肿块诊断符合率为87.5%(42/48)。良、恶性肿块在肿块周围、内部的血流信号及钙化灶方面的差异有统计学意义(P<0.01)。结论彩色多普勒超声在乳腺良、恶性肿瘤鉴别诊断中具有较高的临床应用价值。 相似文献
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目的评价超声联合钼靶X线检查在乳腺良恶性肿瘤鉴别诊断中的应用价值。方法经病理证实的168个乳腺肿瘤术前均行超声及钼靶X线检查,评估两种诊断方法及联合应用的灵敏度、特异度、阳性预测值、阴性预测值及诊断符合率。结果 168个乳腺肿瘤中,良性113个,恶性55个。除钼靶对恶性肿瘤钙化的显示率高于超声之外(P〈0.01),两者在其余指标的检测差异均无统计学意义(P〉0.05)。二者联合诊断乳腺良恶性肿瘤的特异度、阳性预测值及符合率均优于单用超声、钼靶,差异均有统计学意义(P〈0.01或0.05)。结论超声和钼靶X线联合应用可显著提高乳腺肿瘤的诊断符合率。 相似文献
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目的探讨二维及彩色多普勒超声(CDFI)对乳腺肿块鉴别诊断的价值。方法120例女性患者,术前应用二维超声观察乳腺肿块的大小、形态、位置、边界、包膜、内部回声;采用CDFI检测肿块周边及内部的血流形态、特点,并将彩色血流分为0~Ⅲ级。结果超声诊断乳腺肿块检出率为100%,良、恶性肿瘤超声诊断符合率分别为88.5%、85.7%。良性肿瘤多表现为边界光滑,侧缘回声减弱,CDFI血流分级以Ⅰ~Ⅱ级为主;恶性肿瘤多表现为形态不规则,边界不清,内部回声不均,CDFI血流分级以Ⅱ~Ⅲ级为主。恶性组的收缩期峰值流速(Vmax)、阻力指数(RI)、搏动指数(PI)分别为(28.2±7.3)cm/s、(0.78±0.09)、(1.8±0.3),良性组则分别为(13.5±6.7)cm/s、(0.63±0.07)、(1.2±0.2),差异均有统计学意义(P<0.01)。结论二维超声联合CDFI在乳腺良恶性肿瘤的鉴别诊断中有较高的应用价值。 相似文献
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目的比较MRI动态增强成像(DCE-MRI)及超声(US)在乳腺良恶性病变中的诊断价值。方法回顾性分析105例乳腺病变患者的影像学资料,均行DCE-MRI及US检查。按照美国放射学会推荐的"乳腺影像报告和数据系统"(BI-RADS)进行分类,以术后病理诊断为金标准,应用受试者工作特征曲线(ROC)评价两种检查方法及联合检测的诊断效能。结果 105例患者共检出125个病灶,病理诊断良性病变52例(41.6%),恶性病灶73例(58.4%)。以BI-RADS分级4类以上为检查阳性,4类以下为阴性,DCE-MRI对恶性病变诊断的准确率高于US(94.4%vs 76.7%,P=0.043);DCE-MRI对良性病变诊断的准确率与US比较差异无统计学意义(82.7%vs 88.5%,P=0.578);DCE-MRI、US及联合检测的ROC曲线下面积分别为0.915、0.849和0.938(P0.001),联合检测的灵敏度、特异度均高于单项检查(97.3%vs 90.4%vs 76.7%和72.3%vs 69.3%vs 84.5%,P0.05)。结论 MRI动态增强成像及超声在乳腺良恶性病变的诊断中准确率均较高,二者联合应用优于单一检查方法。 相似文献
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目的:探讨超声引导下Mammotome真空辅助旋切系统对乳腺良性肿块进行微创切除的应用价值。方法:对96例乳腺肿块患者的137个肿块在超声引导下进行Mammotome切除术,并进行回顾性分析,总结实施要点,评价其在乳腺肿块切除中的应用价值。结果:全部肿块均采用Mammotome旋切,术后病理学诊断均为良性,术后无切口瘢痕,乳房外形正常,皮肤触觉无变化。术后并发症包括血肿形成1例、皮下淤斑3例。术后3个月和6个月接受超声复查,均未发现病灶残留。结论:超声引导下Mammotome旋切术可完整切除乳腺良性病灶,是一种值得推广的微创手术方法。 相似文献
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目的分析实时弹性成像(UE)对乳腺肿瘤良恶性的诊断意义。方法对234例发现乳腺肿瘤女性患者的264个病灶进行UE检查及病理活检复检,比较经UE检查的评分与病理活检检测结果的差异。结果 264个病灶中,经UE检查诊断为恶性肿瘤97例,良性肿瘤167例;病理检查诊断为恶性肿瘤100例,良性肿瘤164例,两者的诊断结论差异无统计学意义(?2=0.073,P>0.05);UE检查诊断乳腺肿瘤的总符合率为96.6%,其中诊断良性乳腺肿瘤的符合率为98.2%,诊断恶性乳腺肿瘤的符合率为94.0%。结论 UE技术有助于乳腺肿瘤良恶性的鉴别诊断。 相似文献
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近红外线乳腺检查在乳腺癌诊断中的价值 总被引:2,自引:0,他引:2
目的:评价近红外线检查在乳腺癌诊断中的价值。方法:对本院门诊或住院患者经近红外乳腺检查诊断为乳腺癌者119例行开放手术活检,并将结果进行统计分析。结果:119例中病理证实为乳腺癌108例,其它良性疾病11例,近红外线乳腺检查诊断乳腺癌的符合率为90.8%,假阳性率为9.2%。结论:近红外线乳腺检查符合率高,是诊断乳腺癌较可靠方法之一;由于具有无害、无创、操作简便、费用低等优点,可在各级医院推广使用。 相似文献
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目的:运用三维超声表面成像及超声断层成像(TUI)技术,探讨对胎儿唇腭裂的诊断价值。方法:对孕检的20~40周胎儿2862例,系统超声观测胎儿鼻唇情况,然后应用三维超声实时动态面部成像及TUI技术。结果:2862例胎儿中,诊断唇裂21例,其中唇裂伴腭裂6例,单纯唇裂15例,正中裂2例,双侧唇裂2例,左侧多于右侧,无单纯腭裂。结论:三维超声面部成像直观显示胎儿唇裂,TUI技术的应用有助于诊断胎儿腭裂,提高了胎儿畸形的产前诊断率,具有重要的应用价值。 相似文献
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目的了解超声造影诊断肝脏良、恶性病变的增强表现及临床意义。方法对经手术、病理、或增强CT(MRI)证实的58例患者60个肝局灶性病变进行超声造影,研究病灶的造影增强模式,并判断病变的良性、恶性。结果(1)恶性病灶:原发性肝细胞癌(HCC)9个呈"快进快出";转移性肝癌14个,动脉期多呈周边环状或厚圈状"快进",之后均廓褪为低或极低回声。(2)良性病灶:19个肝血管瘤多为典型"慢进慢出";9个局灶性增生结节多为快进慢出型,早期可见增强的中央血管及放射状血管,其余9个肝脏良性病灶多表现为"慢出"型。结论肝内良、恶性病灶具有不同的增强模式和特征,超声造影对肝内良恶性病变的鉴别诊断具有很好的应用意义。 相似文献
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目的:探讨端粒酶活性与人乳腺良、恶性病变组织之间的关系。方法:用TRAP-ELISA检测法,对15例乳腺良性病变和7种乳腺癌组织进行端粒酶活性水平检测。结果:7例乳腺浸润性导管癌中,5例端粒酶阳性,而15例乳腺良性疾病中仅2例端粒酶阳性,两组差异有显著性(P〈0.05)。此外,有淋巴结转移与无淋巴结转移的乳腺癌组织中端粒酶活性水平差异无显著性(P〉0.05)。结论:端粒酶的激活在人类乳腺癌的发生过 相似文献
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Projective imaging of pulsatile flow with magnetic resonance 总被引:8,自引:0,他引:8
V J Wedeen R A Meuli R R Edelman S C Geller L R Frank T J Brady B R Rosen 《Science (New York, N.Y.)》1985,230(4728):946-948
Noninvasive angiography with magnetic resonance is demonstrated. Signal arising in all structures except vessels that carry pulsatile flow is eliminated by means of velocity-dependent phase contrast, electrocardiographic gating, and image subtraction. Background structures become in effect transparent, enabling the three-dimensional vascular tree to be imaged by projection to a two-dimensional image plane. Image acquisition and processing are accomplished with entirely conventional two-dimensional Fourier transform magnetic resonance imaging techniques. When imaged at 0.6 tesla, vessels 1 to 2 millimeters in diameter are routinely detected in a 50-centimeter field of view with data acquisition times less than 15 minutes. Studies of normal and pathologic anatomy are illustrated in human subjects. 相似文献
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3.0T质子磁共振波谱在阿尔兹海默病的应用 总被引:1,自引:0,他引:1
目的观察3.0T氢质子磁共振波谱(IH—MRS)检测阿尔茨海默病(AD)的代谢变化及其临床意义。方法对30例临床确诊轻度AD组患者(AD组)和30名健康对照者(对照组)的1H—MRS进行分析,对两组颞叶海马区行1H—MRS检测,得到N-乙酰天门冬氨酸(N—acetyl aspartate,NAA)峰、肌酸(creatine,Cr)峰、胆碱(choline,Cho).峰的积分值及计算出NAA/Cr、Cho/Cr和MI/Cr,并将两组数据进行对比。结果AD组患者颞叶海马区的NAA/Cr值为(1.47±0.15)、Cho/Cr值为(0.79±0.18)、MI/Cr值为(0.77±0.15),与对照组比较差异均有统计学意义(P〈0.01)。结论1H—MRS检测颞叶海马区的NAA/Cr比值降低及MI/Cr比值升高对轻度AD临床辅助诊断有一定提示价值。 相似文献
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Functional magnetic resonance imaging in medicine and physiology 总被引:3,自引:0,他引:3
C T Moonen P C van Zijl J A Frank D Le Bihan E D Becker 《Science (New York, N.Y.)》1990,250(4977):53-61
Magnetic resonance imaging (MRI) is a well-established diagnostic tool that provides detailed information about macroscopic structure and anatomy. Recent advances in MRI allow the noninvasive spatial evaluation of various biophysical and biochemical processes in living systems. Specifically, the motion of water can be measured in processes such as vascular flow, capillary flow, diffusion, and exchange. In addition, the concentrations of various metabolites can be determined for the assessment of regional regulation of metabolism. Examples are given that demonstrate the use of functional MRI for clinical and research purposes. This development adds a new dimension to the application of magnetic resonance to medicine and physiology. 相似文献
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Nuclear magnetic resonance imaging of the vitreous body 总被引:2,自引:0,他引:2
R G González H M Cheng P Barnett J Aguayo B Glaser B Rosen C T Burt T Brady 《Science (New York, N.Y.)》1984,223(4634):399-400
Imaging with proton nuclear magnetic resonance is a valuable new tool for studying the vitreous body of the eye. It is particularly suited for the detection of vitreal liquefaction and intraocular hemorrhage because of the dependence of the signal on the physical environment of water. Conversely, the vitreous body provides a new model for studying changes in proton relaxation times of protein solutions in biological systems. 相似文献
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Noninvasive imaging methods for medical diagnosis and biological investigations, have evolved from qualitative radiological techniques to quantitative methods of measuring biochemical and physiological processes in human body. In particular, new developments in emission tomography, nuclear magnetic resonance imaging, and in vivo spectroscopy offer new horizons for medical research and clinical activities. These methods and their potentials are reviewed and contrasted. 相似文献
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Wiltshire MC Pendry JB Young IR Larkman DJ Gilderdale DJ Hajnal JV 《Science (New York, N.Y.)》2001,291(5505):849-851
Magnetic resonance imaging and spectroscopy systems use coils, either singly or as arrays, to intercept radio-frequency (RF) magnetic flux from regions of interest, often deep within the body. Here, we show that a new magnetic material offers novel possibilities for guiding RF flux to the receiver coil, permitting a clear image to be obtained where none might otherwise be detectable. The new material contains microstructure designed according to concepts taken from the field of photonic band gap materials. In the RF range, it has a magnetic permeability that can be produced to specification while exhibiting negligible direct-current magnetism. The latter property is vital to avoid perturbing the static and audio-frequency magnetic fields needed to obtain image and spectral data. The concept offers a new paradigm for the manipulation of RF flux in all nuclear magnetic resonance systems. 相似文献