Morphological,Functional, and Tissue Characterization of Silent Myocardial Involvement in Patients With Primary Biliary Cholangitis

1. Download : Download high-res image (419KB)
2. Download : Download full-size image

     

Differentiating benign from malignant cardiac tumors with cardiac magnetic resonance imaging

Background

The purpose of this analysis is to describe the differences in cardiac magnetic resonance characteristics between benign and malignant tumors, which would be helpful for surgical planning.

脑膜病变MRI异常强化类型与病因的相关性分析

目的 探讨各种脑膜病变脑膜MRI强化类型与病因的关系。方法 回顾性分析78例资料完整，MRI增强扫描脑膜异常强化的非脑膜瘤。结果 78例中，脑膜癌病16例（硬脑膜-蛛网膜型2例，软脑膜-蛛网膜下腔型11例，混合型3例）；感染性脑膜炎18例（硬脑膜-蛛网膜型3例，软脑膜-蛛网膜下腔型13例，混合型2例）；脑梗死22例（软脑膜-蛛网膜下腔型18例，混合型4例）；开颅术后15例（硬脑膜-蛛网膜型10例，混合型5例）；硬膜下积液（血肿）7例，均为硬脑膜-蛛网膜型。结论 MRI双倍剂量Gd-DTPA增强扫描对脑膜病变敏感性高，脑膜强化类型与各种病因侵犯脑膜三层结构的方式和程度有关。     

Early computed tomographic scanning after resection of brain tumors in children

Enhanced and non-enhanced computed tomography (CT) brain scans were performed within 72 h of surgery on 21 children in whom brain tumors had been resected totally or subtotally, and scans were repeated at varying intervals thereafter. Biopsies of the resection margins were performed in 12 patients at the end of the surgical procedure. The immediate CT scan showed enhancement in the resection margin in 13 of the 21 patients and in 9 of the 13, the enhancement disappeared on follow-up scans. There was discordance between the results of immediate CT scan examination and the biopsies of the resection margins in 7 of the 12 cases. The advantages and disadvantages of an immediate postoperative scan versus a more delayed CT scan are discussed.     

臂丛加强化麻醉后并发颈部抽动9例分析

目的探讨臂丛加强化麻醉后颈部抽动的原因及防治。方法对近年来在麻醉方法、用药相同,术后颈部抽动患者的观察治疗过程进行分析。结果臂丛麻醉并发颈部抽动给予充分镇静后可完全治愈。结论麻醉后并发颈部抽动为药物副作用及颈局部刺激的综合作用。     

MRI同层动态增强对垂体微腺瘤的诊断价值

目的：分析垂体微腺瘤的MPd同层动态增强特征。方法：对40例临床怀疑为垂体微腺瘤的病人行同层动态增强MPd扫描，并绘出时间一信号强度曲线图。结果：40例病人中共检出垂体微腺瘤26例。同层动态增强后垂体微腺瘤的MPd表现为圆或椭圆形的低或稍低信号，似“充盈缺损”；垂体微腺瘤的最大信号强度多出现在注入造影剂后32～96s，以64s最明显。结论：同层MPd动态增强对垂体微腺瘤的诊断有较高价值。     

原发性胸椎原始神经外胚层肿瘤的动态增强MRI表现

目的 初步探讨原始神经外胚层肿瘤(PNET)的动态增强MRI表现，以及对其诊断及鉴别诊断的价值。方法 用动态增强MRI方法对已手术和病理证实的2例胸椎PNET行3次MR检查并进行前瞻性研究。结果 在信号强度-时间和对比增强率．时间曲线上，2例PNET3次检查均表现为快升慢降型，即肿瘤早期就开始迅速增强，上升峰极陡，60～120s即达到高峰水平，然后保持平坦，3．5min内未见明显下降曲线。结论 动态增强MRI扫描能帮助对PNET进行早期诊断和鉴别诊断，从而为临床选择治疗方案及估计预后提供较为可靠的依据。     

Recognition performance and perceived quality of video enhanced for the visually impaired

Subjects with central field loss (CFL) individually selected enhancement parameters to improve visibility of static video images. The effect of enhancement on performance and on perceived quality of motion video was assessed. Performance, e.g. recognition of visual details, was assessed by having subjects answer questions regarding visual information contained in the video motion segments that were enhanced using the individually-selected parameters. Enhancement did not improve subject performance on questions about video content. This result might be due to a ceiling effect limitation of the performance assessment method. In a second procedure, subjects' continuous perceptions of quality (using an adjective-based rating scale) were made while the enhancement parameters were abruptly switched among multiple values; these included the individually-selected enhancements, as well as unenhanced, over-enhanced, and degraded segments. The results indicate that adaptive enhancement (individually-tuned using a static image) adds significantly to perceived image quality when viewing motion video. Subjects who selected stronger contrast enhancement also perceived the enhancement to provide a larger benefit in image quality.     

乳腺癌新辅助化疗后动态增强MRI表现与病理反应性相关性研究

目的探讨乳腺癌新辅助化疗后动态增强MRI（DCE—MRI）表现的形态学和时间信号强度曲线（TIC）类型与病理学反应性的关系。方法45例乳腺癌患者经新辅助化疗结束后行乳腺DCE—MR检查及手术治疗。应用AW4．2图像工作站观察残余肿瘤强化的形态和TIC类型（共3型）。由病理科医师对乳腺癌化疗后手术标本的病理反应性进行评估，分为1～5级，5级为病理完全缓解，4级和5级为组织学显著反应。分析病理反应性级别与DCE—MRI残余强化的TIC类型、形态的关系，统计方法采用精确概率法。结果45例中病理反应性5级7例，4级16例，3级16例，1和2级共6例。20例I型曲线中组织学显著反应者占70．0％（14／20），而6例Ⅲ型曲线均为组织学反应不显著者。TIC类型在不同的病理反应级别分布差异有统计学意义（P=0．001）。组织学显著反应且有残余强化者共18例，其中非肿块性强化11例。残余强化的肿块（非肿块）形态表现在不同病理反应性分级中分布差异有统计学意义（P=0．012）。结论乳腺癌新辅助化疗后DCE—MRI的形态及血液动力学表现特点与化疗后病理反应性相关。非肿块性强化和I型TIC与组织学显著反应有关。