周围门控技术在胸部血管磁共振成像的应用

目的：探讨周围门控技术在胸部血管MR成像中的应用。材料和方法：选取正常健康志愿者5例，患者5例，应用Philips GyroscanNTl．5T磁共振成像仪，采用快速梯度回波序列加心电(ECG)门控和周围(PPU)门控对胸部血管进行成像。结果：采用快速梯度回波序列，加ECG门控或PPU门控扫描分别获得胸部血管图像，发现PPU门控亦能很好地抑制心脏和血流搏动造成的伪影。结论：采用快速梯度回波技术结合PPU门控技术可以获得与ECG门控技术相类似的成像效果。     

基于标准心血管MR成像的长轴应力和心肌收缩分数在非缺血性扩张型心肌病中的诊断及预测价值

<正>摘要目的对比分析已有的功能指标和基于标准心血管MR影像的2个新增功能指标在非缺血性扩张型心肌病(NIDCM)中的诊断和预测价值。材料与方法本研究获得伦理委员会批准。回顾性分析2005—2013年间行MR检查的453例NIDCM病人及150名健康对照者资料。心肌收缩分数(MCF)等于左心室(LV)每搏输出量除以LV心肌容积;在收缩末期及舒张末期分别测量心尖部心外膜下至二尖瓣2     

应用64层CT一次扫描完成心脏冠脉成像及心功能分析的可行性初步研究

目的研究64层CT一次扫描同时完成心脏冠脉成像及心功能分析的可行性。方法96例患者均行MSCT心脏成像扫描和MR心脏检查,数据分别按照冠脉成像和心功能分析要求进行重建和后处理,评估。结果1271段冠脉血管中有约99%血管显示清晰,达到诊断要求;心功能分析数据左室舒张末期容积(LVEDV)、左室收缩末期容积(LVESV)、左室每搏输出量(LVSV)、左室射血分数(LVEF)、左室心肌容积(LVMV)与MR相关数据的相关系数分别为0.84、0.91、0.94、0.89、0.88。结论MSCT可以在一次扫描中完成冠脉成像和心功能数据采集,具有极高应用价值。     

肺栓塞的MR成像:对比增强3DMR肺血管成像,对比增强低翻转角3DGRE序列和非增强自由诱发FISP序列的诊断准确性

目的分别应用标准团注-触发呼吸门控对比增强MR肺血管成像、对比增强重复循环相位呼吸门控低翻转角三维(3D)梯度回波(GRE)序列、平扫自由诱发心脏-呼吸门控真稳态快速进动(FISP)MR序列来评价肺动脉栓塞(PE)相关性表现。材料与方法此项研究遵从HIPAA并且经机构审查委员会批准。22例经CTA诊断PE的病人在CT检查后     

运用高时空分辨率MR k空间及时间敏感编码技术实时评估先天性心脏病病人左、右心室容积及功能

目的比较心电门控MR电影成像、标准实时MR成像及实时k空间-时间敏感编码成像3种技术评估先天性心脏病病人心室容积的大小。材料与方法本研究经学术伦     

胎儿心脏自门控MR成像与心脏实时触发技术的对照研究

目的应用绵羊模型研究自门控技术的胎儿心脏MR成像。材料与方法用1.5TMR扫描获取6只绵羊胎儿心脏的影像。应用自门控技术获取胎儿心脏横断位、两腔     

开发和证实用于功能和分子超声成像的基于内在固有标记的门控技术

摘要目的在对比增强超声中使用内在固有标记的回顾性门控技术,并与非门控、人工门控以及外部门控的对比增强超声比较有效性。方法5例健康小鼠和5例NEMO敲除的肝脏发育不良小鼠行肝脏对比增强超声成像。记录健康小鼠非特异性微泡的首过效应以及敲除小鼠特异性VEGFR-2微泡的滞留情况。对于回顾性门控,呼吸运动的标记被画为兴趣区。吸气时,兴趣区的信号强度发生变化,从而作为门控信号作用。为了评估准确性,获取非门控的、外在门控和内在固有标记门控的时间强度曲线。     

电影磁共振成像和超声心动图评价右心室功能的对比研究

目的 :了解BalancedFFE电影磁共振成像进行右心室功能分析的价值和限度。方法 :分别用BalancedFFE电影磁共振和二维超声、实时三维超声心动图对 2 5例健康志愿者进行右心室舒张末期容积、收缩末期容积 ,每搏输出量以及射血分数等功能指标的测定 ,并比较其测量值。结果 :BalancedFFE电影磁共振测量 2 5例健康志愿者右心室舒张末期容积为 (10 1.3 2± 6.77)ml ,收缩末期容积为 (5 4.3 7± 6.41)ml ,每搏输出量 (5 2 .47± 2 .98)ml ,射血分数为 (65 .44± 5 .17) % ,与实时三维超声心动图测量值相关性良好 (r值在 0 .74～ 0 .98)。结论 :BalancedFFE电影磁共振能够准确测量右心室容积变化情况 ,对右心室功能评价具有很高价值。     

螺旋采样联合动态压缩传感高速信号采集技术在单次屏气腹部4D血流MR成像中的应用

<正>目的研究一种基于螺旋采样及动态压缩传感信号采集技术的高速相位对比心脏门控容积流量测量(4D流量)MR成像技术,并与已有的相位对比成像技术进行比较,     

自门控各向同性径向肝脏强化晚期MR成像的可行性研究

正摘要目的评估3D各向同性自门控径向容积内插屏气(VIBE)检查技术用于肝脏晚期MR成像的可行性。方法共70例病人行1.5 T肝脏MRI检查。根据诊断,35例病人进行Gd-EOB-DTPA增强扫描,35例进行钆布醇增强扫描。在强化晚期(注射钆布醇后6~9 min)或者肝细胞特异期(GdEOB-DTPA),需重建一个径向原型序列:1采用自门控40%数据接收(rVIBE_(40));2100%的数据接收(r VIBE_(100)),与Cartesian VIBE(cVIBE)比较。分别从质(影像质量、病灶显著性、伪     

Optimization of the system of medical service of students of Cadet Schools of the Ministry of Defense of the Russian Federation

One of the factors of the successful military career guidance Cadet schools students is preserving and promoting their health. Medical support of children and adolescents aged 10-17 years should include the full range of medical and preventive measures defined for this group. The state of providing outpatient care for pupils at the Cadet School in St. Petersburg was studied. These results show that full medical care in accordance with the standards can be based only on children's health clinics. It is important that the organization of medical support pupils cadet schools should be cooperate with civilian health care.     

带状疱疹83例误诊原因分析

带状疱疹是由水痘—带状疱疾病毒引起的皮肤科常见疾病。其主要的病理损害,一是受累神经的严重炎症性浸润,继而导致受侵犯神经节内神经细胞变性、坏死;二是皮肤的水泡。迅速抑制神经节和相应的感觉神经纤维的充血、水肿和坏死,防止粘连形成,达到迅速镇痛、改善皮损,缩短病程及防止后遗症的发生是治疗的关键。因而,尽早明确诊断,     

Estimation of accumulated dose of radiation by method of ESR-spectrometry of dental enamel of mammals

ESR-spectrometry was used to investigate radiation-induced paramagnetic centers in enamel of mammals: carnivores (polar bear and fox), ungulates (reindeer, European bison, moose), and man. Values at half the microwave power saturation of the radiation signal, P_1/2, evaluated at room temperature, was found to range from 16 to 26 mW for animals and man. A new approach to discrimination of the radiation induced signal from the total ESR spectrum of reindeer enamel is proposed. ‘Dose-response’ dependencies of enamel of different species mammals were measured within the dose range from 0.48 up to 10.08 Gy. Estimations of ‘radiosensitivity’ enamel of carnivores and ungulates showed good agreement with radiosensitivity enamel of man by ESR method.     

Analysis of the results of the international comparison of activity measurements of a solution of Fe

The results of an international comparison of activity measurements of a solution of ⁵⁵Fe organized by the BIPM in 2005 are reported and analysed. This exercise, which follows the procedures of the CIPM mutual recognition arrangement to update older comparisons, is a renewal of the comparison organized by the BIPM that took place in 1978. A EUROMET comparison was organized in 1996 specifically to compare activity measurements of a ⁵⁵Fe solution by means of liquid-scintillation techniques. Results of these three comparisons are presented and discussed in this paper.

The radionuclide solution was provided by the NPL, which also distributed the samples to the participants. The activity of the ampoules was measured by 16 laboratories using 12 methods producing 25 results. Some general considerations on uncertainty assessments pertaining to the different techniques used are drawn. The outcome of four different estimators is compared from which the presence of at least one outlier can be confirmed. Further measurements should be made to try to reduce the discrepancy between the results. To date the outcome of the present comparison does not show an improvement to that of the 1996 comparison.     

Evaluation of the results of various technics of non-surgical therapy of varicocele

A new method of non-surgical treatment of varicocele syndrome is described: it consists in sclerotherapy of spermatic vein by trans-femoral percutaneous catheterization with balloon-catheters. In 8 cases venous thrombosis has been induced by direct electric clotting. The techniques and a 6 months follow-up are discussed. It is pointed out that this procedure should be considered as the method of choice for tubular lesions and sub-fertility prophylaxis in young people and in childhood.     

延迟性脾破裂误漏诊原因分析

目的探讨延迟性脾破裂误漏诊原因和预防措施.方法回顾性分析总结12例延迟性脾破裂中的诊断和误漏诊的经验与教训.结果本组延迟性脾破裂的误漏诊5例(41.66%).对多发伤与脾破裂并存可能认识不足,外伤史轻微或伤员隐瞒外伤史,缺乏腹痛-缓解-突然再腹痛的典型病史,缺乏“对冲性脾破裂”力学分析和整体化诊断思路等为其误漏诊的主要原因.结论详细的外伤史和全面系统检查,重视腹以外多发伤掩盖腹内脏器伤及延迟性脾破裂可能.确立外伤-腹内脏器伤-脾破裂整体化诊断思路.不间断地辅以B超检查脾形态学变化和腹内有无积液,腹腔穿刺确定有无血腹、X线胸腹部检查观察左侧胸肋角和膈肌运动情况、必要时CT检查以尽早发现脾包膜下血肿,降低延迟性脾破裂误漏诊率.