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     

临床神经放射中高场MRI的诊断相关问题:“驾驶一辆跑车”的优势与挑战

理论上一些疾病在更高的磁场强度下可获得更高的诊断准确率,因而3T高场磁共振设备在神经影像领域内的应用逐步增加。本文编辑就有关Wardlaw及其同事比较3T与1.5T磁共振设备在神经放射学中应用的详尽综述进行了讨论。结果发现使用3T代替1.5T进行MR成像后,并没有改善影像质量、提高诊断准确率和减少检查时间的确切证据。由于目前新一代的高场7TMR成像设备开始出现,故这些发现更具意义。     

腕管综合征时正中神经的扩散张量成像和纤维束示踪的初步研究结果

目的是为了显示在1.5TMR设备上进行人活体正中神经扩散张量成像和纤维束示踪的可行性,并评估健康志愿者与腕管综合征病人扩散成像的潜在不同。13例病人     

分段读出平面回波成像对3.0T扩散加权MR乳腺检查诊断能力的改善

目的定性和定量对比乳腺病人在3.0TMR扩散加权成像上基于标准单次激发平面回波成像和分段读出平面回波成像的诊断价值。材料与方法通过机构审查委员会批准并获得书面知情同意书。该研究包括47例病人的49个经组织病理学确诊的病灶。所有病人均在3.0TMR设备上以     

采用影像叠加技术的增强现实可视化应用于MR成像引导下的介入治疗:1.5TMR尸体肩关节和髋关节成像的应用评估

摘要目的前瞻性评估叠加技术对MR成像引导下肩关节和髋关节成像的准确性和效率。材料与方法联合应用增强现实影像叠加系统原理机与1.5TMR设备,对12具尸体共24个肩关节和髋关节进行研究     

7.0TMR配置3种多通道发射/接收射频线圈在心脏解剖和功能成像的比较

目的 7TMR配置3种多通道发射/接收射频线圈实行心脏MR(CMR)的比较。方法使用3种射频发射/接收(TX/RX)线圈,分别是4、8和16通道线圈。10名健康志愿者[7名男性,年龄(28±4)岁]采用7TMR设备进行了CMR,这三种RX/TX线圈均得到了心脏的二维的CINEFLASH影像。进行心腔定量分析、信噪比(SNR)分析,并行成像性能评估及影像质量评分。结果平均总的检查时间为(29±5)min。8通道、16通道线圈获得的所有影像是可以诊断的,观察射血分数(EF)(P>0.09)、左室质量(LVM)(P>0.31),这两种线圈间的差异无统计学意义。8通道和16通道线圈比4通道线圈产生了较高的SNR,16通道线圈的影响因素最低(平均值±标准差为2.3±0.5,R=4),16通道线圈的影像质量明显高于8通道和4通道线圈(P<0.04)。结论 7.0T配置3种线圈适合常规的CMR,较大数目的线圈提高了影像质量和并行成像性能,但不会影响心腔定量的准确性。     

心脏MR T_2WI对心肌淀粉样变性的预后评价

目的本研究旨在探讨心脏MR成像诊断心肌淀粉样变性的价值及其预测性指标。方法 36例心肌淀粉样变性病人和48例健康志愿者行1.5TMR检查。扫描方案包括电     

心脏MR T2WI对心肌淀粉样变性的预后评价

目的本研究旨在探讨心脏MR成像诊断心肌淀粉样变性的价值及其预测性指标。方法 36例心肌淀粉样变性病人和48例健康志愿者行1.5TMR检查。扫描方案包括电     

3 T MR扩散加权成像描述前列腺癌的最佳b值是什么?

目的确定3TMR扩散加权成像显示前列腺癌的最佳b值。方法41例经活检证实前列腺癌的病人用16通道线圈采用5个b值(0、1000、1500、2000、2500s/mm2)的3TMR扩散加权成像检查。对比不同b值影像的最佳病灶显     

运用7.0TMR磁化预备的3D-FLAIR和3D-DIR序列对多发性硬化病灶的检测

目的为了探讨7.0TMR三维T2加权液体衰减反转恢复(FLAIR)和双反转恢复(DIR)MR成像序列对多发性硬化(MS)病灶检测的可行性和价值。方法选10例MS病人和5名健康志愿者,7.0TMR扫描设备,将磁化预备     

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.