前瞻性比较T2加权MRI和动态增强MRI、3D MR波谱成像或扩散加权MRI在重复经直肠超声导引下活检的作用

目的比较T2WMRI和功能MRI技术在指导重复前列腺活检中的作用。方法68例活检阴性,直肠指诊阴性和前列腺特异抗原(PSA)升高病史的病人,在重复前列腺活检     

前列腺MRI:在与前列腺切除术Gleason分级的相关性中,1.5 T MRI DWI优于经直肠超声引导的在外周带肿瘤中行活组织检查

目的研究与经超声引导的活组织检查所得Gleason分级(bGG)相比较,表观扩散系数(ADC)在预测前列腺切除术的Gleason分级(pGG)和Gleason评分(GS)的有效性。方法将经活检证实的24例前列腺癌病人纳入研究,应     

能否对前列腺多序列MRI发现局灶性异常恶性的危险性标准化评估?

正摘要目的评估前列腺MRI显示的局灶性异常(FA)是否可用简单性状特征确定其特性。方法134例前列腺活检前接受1.5T设备T2加权、扩散加权与动态增强MRI检查的病人纳入此前瞻性研究。按照MR各序列显示外形、信号异常程度(0~3;0为正常,3为显著异常)与主观评分(SS1~SS3;SS1为可能良性,SS     

经会阴前列腺分层饱和穿刺活检在首次前列腺穿刺活检阴性患者中的价值

目的 探讨经会阴前列腺分层饱和穿刺活检在首次前列腺穿刺活检阴性患者中的应用价值。方法84例因直肠指诊、血清前列腺特异性抗原（PSA）和前列腺MRI检查异常而接受经直肠标准12针穿刺活检且结果为良性的患者,行超声引导下经会阴前列腺分层饱和穿刺活检,计算前列腺癌的检出率。结果84例患者行经会阴前列腺分层饱和穿刺活检,诊断为前列腺癌23例（27.4%）,良性前列腺增生61例（72.6%）,其中合并高级别上皮内瘤变3例,慢性前列腺炎5例。结论经会阴前列腺分层饱和穿刺活检可以提高前列腺癌的检出率,对于初次活检阴性,但直肠指诊、前列腺MRI检查异常并且血清前列腺特异性抗原持续升高的患者,可以考虑应用此穿刺活检方法再次穿刺活检予以明确诊断,避免漏诊和延误治疗。     

男性前列腺特异性抗原升高的简略双参数前列腺MRI特征

正摘要目的在前列腺特异性抗原(PSA)升高且活检结果为阴性的男性病人中,明确简略双参数MRI诊断临床显著性前列腺癌的准确性,并与多参数MRI进行比较。确定双参     

3 TMR引导下经直肠前列腺穿刺活检:基于前列腺影像报告和数据系统(PI-RADS)第2版诊断前列腺癌

正摘要目的依据PI-RADS第1版和第2版判断在3 T MR引导下前列腺活检的诊断率。材料与方法本研究符合HIPAA并经机构伦理委员会批准。对106例男性病人行3 T MR引导下前列腺穿刺活检,获得134个活检组织。入组标准:1以往未行前列腺活检者,2以前前列腺活检阴性,但前列腺特异性抗原(PSA)水平升高者,或3具有前列腺癌病史且PSA水平升高者。临床采用3 T MR对前列腺进行引导穿刺活检并搜集病理资料。对每例病人及每个活检组织进行     

高危人群隐匿性乳腺癌的MRI检查

虽然美国妇女一生乳腺癌发生率为1／8，但有些人群有高危因素(既往乳癌史、乳癌家族史等)。MRI检查对乳癌检出敏感度高(94％～100％)，适于筛查。作通过较大组病例的研究，确定无症状、乳腺平片检查阴性的女性乳癌高危人群的首轮乳腺MRI筛查对乳癌的发生率及活检结果。     

MRI多参数成像联合超声在前列腺癌诊断中的价值

目的 探讨前列腺MRI多参数成像联合超声引导下穿刺活检术在前列腺癌(PCa)诊断中的价值.方法 选取100例前列腺特异性抗原(PSA)升高的前列腺疾病患者,其中包括2组检查方法不同的患者:A组(50例)直接行超声引导下穿刺活检术,B组(50例)首先行前列腺MRI多参数成像,后在MRI提示下行超声引导下穿刺活检术;对2组...     

前列腺癌活检术后出血和MR诊断时肿瘤可检出性的相关性研究

目的以组织病理学结果为参照标准，回顾性评价前列腺癌活检术后出血对MRT2WI、动态增强MRI和DWI对肿瘤检出准确性的影响。方法本研究经伦理委员会同意并免除知情同意书。40例男性前列腺癌病人，年龄62～84岁（平均71岁），超声（US）引导系统下前列腺的12针活检术后行前列腺MRI检查。活检和MRI检查间隔平均24d（6-54d）。在1．5TMR设备上行T1WI、T2WI、动态增强与DWI检查。依据活检部位，于MR影像上将前列腺分为8个区域。3位医师共同分析每个区域是否有出血及有无前列腺癌，     

合成MRI临床应用的研究进展

合成MRI是一种定量磁共振成像技术[1],该技术一次扫描即可得到T1、T2、质子密度(PD)的定量图谱和包含反转恢复(IR)在内的多种对比加权图像[2].合成M RI可以应用于全身各个系统,目前的研究多数集中在脑成像方面,并且研究结果获得了较好的临床应用.现有文献显示该技术在前列腺、乳腺、骨关节等方面的研究越来越多.本...     

Functional MRI of the patellofemoral joint: comparison of ultrafast MRI,motion-triggered cine MRI and static MRI

In recent years ultrafast gradient echo sequences have been used in MRI that allow functional MRI studies of the joints during active motion in an acquisition time of seconds. To evaluate the feasibility and usefulness of ultrafast MRI (u), patellar tracking from 30° of flexion to knee extension (0°) was analysed and compared with motion-triggered cine MRI (m) and a static MRI technique (s). The different imaging methods were compared in respect of the patellofemoral relationship, the examination time and image quality. Eight healthy subjects and four patients (in total 18 joints) with patellar subluxation or luxation were examined. Significant differences between the static MRI series without quadriceps contraction and the functional MRI studies (motion-triggered cine MRI and ultrafast MRI) were found for the patellar tilt angle (PTA: P _m/s = 0.01; P _u/s < 0.01). In the dynamic joint studies there was no statistical difference of the regression coefficients between the motion-triggered cine MRI studies and the ultrafast MRI studies (P _m/u = 0.8). The findings of the functional MRI studies compared with the static MRI images were significantly different for the lateralisation of the patella, expressed by the lateral patellar displacement (LPD: P _m/s < 0.01; P _u/s = 0.01) and bisect offset (BSO: P _m/s = 0.01; P _u/s < 0.05). No significant differences in patellar lateralisation were found between motion-triggered cine MRI and ultrafast MRI (LPD: P _m/u = 0.89; BSO: P _m/u = 0.33). Ultrafast MRI was superior to motion-triggered cine MRI in terms of the reduction in imaging time and improvement of the image quality. Correspondence to: C. Muhle     

Ovary: MRI characterisation and O-RADS MRI

Ultrasound has a high specificity for the diagnosis of a benign lesion in cases of classic appearing simple cyst, hemorrhagic cyst, endometrioma and dermoid. However, ultrasound can sometimes be limited for definitive characterisation and risk stratification of other types of lesions, including those with echogenic content that may appear solid, with or without blood flow. Frequently, MRI can be used to further characterise these types of lesions, due to its ability to distinguish solid tissue from non-tissue solid components such as fat, blood, or debris. Incorporating the MR imaging into the evaluation of adnexal lesions can improve diagnostic certainty and guide clinical management potentially avoiding inappropriate surgery for benign lesions and expediting appropriate treatment for malignant lesions, particularly in the females with sonographically indeterminate adnexal lesions.     

MRI Post-vertebroplasty

PURPOSE: Percutaneous vertebroplasty (PVP), first described by Hervè Deramond in 1984, is an interventional procedure for the treatment of aggressive vertebral angioma. The aim of this study was to evaluate magnetic resonance imaging (MRI) patterns in the affected vertebrae before and after vertebroplasty by determining changes in signal intensity and size and distribution of bone cement within the vertebra at follow-up carried out at 1 week, 6 months and 12 months. MATERIALS AND METHODS: Fourteen patients were examined using MRI, for a total of 41 treated vertebrae; MRI was performed with a 0.5-Tesla (T) superconductive magnet (SIGNA GE). RESULTS: MRI patterns following vertebroplasty are mainly characterised by the signal produced by the areas surrounding the cement and by the cement itself. There is little effect on the size of the treated vertebra. Acrylic cement appears as an intraspongy focal area of T1 and T2 hypointensity that is mostly oval (34%) or rounded (26.8%); this appearance tends to become stable 6 months after treatment. The area surrounding the cement appears hypointense on T1 and hyperintense on T2, a likely expression of bone marrow oedema; this signal alteration tends to disappear gradually. CONCLUSIONS: In pre- and post-vertebroplasty imaging, MRI is regarded as the reference standard for correct evaluation of both container and content. Awareness of cement changes over time and of the reaction of the surrounding bone tissue is crucial for correct assessment of post-vertebroplasty images.     

Understanding MRI

Robert C. Smith, Robert C. Lange CRC Press, Boca Raton, FL, $89.95, pp. 228, more than 100 illustrations, ISBN: 0–8493–2658–3