示波滴定法测定甲磺酸加贝酯的含量

在ｐＨ６．２的醋酸－醋酸钠缓冲液中,甲磺酸加贝酯能与四苯硼钠定量地产生沉淀,过量的四苯硼钠用硫酸亚铊标准液进行回滴定。利用ｄＥ／ｄｔ－Ｅ曲线上四苯硼钠切口的消失指示终点,平均回收率为９９．７２％,ＲＳＤ为０．４５％（ｎ＝６）。     

香菇多糖测定的方法学研究

为选出一种比较准确、方便的香菇多糖的测定方法,对蒽酮-硫酸法、苯酚-硫酸法、直接滴定法三法进行了比较.实验结果表明:蒽酮-硫酸法所测香菇多糖含量偏高,回收率过高(113.6%～145.1%);直接滴定法灵敏度不高,回收率偏低(42.8%～85.8%);而苯酚-硫酸法不仅灵敏度高,回收试验也较理想(92.5%～110.2%).因而,可认为苯酚-硫酸法是测定香菇多糖含量较为理想的方法.     

Validation and accuracy evaluation of automatic segmentation for knee joint pre-planning

BackgroundProper use of three-dimensional (3D) models generated from medical imaging data in clinical preoperative planning, training and consultation is based on the preliminary proved accuracy of the replication of the patient anatomy. Therefore, this study investigated the dimensional accuracy of 3D reconstructions of the knee joint generated from computed tomography scans via automatic segmentation by comparing them with 3D models generated through manual segmentation.MethodsThree unpaired, fresh-frozen right legs were investigated. Three-dimensional models of the femur and the tibia of each leg were manually segmented using a commercial software and compared in terms of geometrical accuracy with the 3D models automatically segmented using proprietary software. Bony landmarks were identified and used to calculate clinically relevant distances: femoral epicondylar distance; posterior femoral epicondylar distance; femoral trochlear groove length; tibial knee center tubercle distance (TKCTD). Pearson's correlation coefficient and Bland and Altman plots were used to evaluate the level of agreement between measured distances.ResultsDifferences between parameters measured on 3D models manually and automatically segmented were below 1 mm (range: −0.06 to 0.72 mm), except for TKCTD (between 1.00 and 1.40 mm in two specimens). In addition, there was a significant strong correlation between measurements.ConclusionsThe results obtained are comparable to those reported in previous studies where accuracy of bone 3D reconstruction was investigated. Automatic segmentation techniques can be used to quickly reconstruct reliable 3D models of bone anatomy and these results may contribute to enhance the spread of this technology in preoperative and operative settings, where it has shown considerable potential.     

基于预测可行性DVH的肝癌VMAT自动计划方法研究

目的:建立基于预测可行性剂量体积直方图(DVH)的肝癌容积调强弧形治疗(VMAT)自动计划方法,并评价其性能。方法:回顾性随机选取10例放疗肝癌病例。采用Pinnacle Auto-Planning设计VMAT自动计划,通过PlanIQ剂量预测得到可行性DVH曲线,并根据其显示的可行性目标区间设置自动计划的初始优化目标...     

酸性染料直接滴定法测定盐酸哌吡(艹卓)酮的含量

盐酸哌吡(艹卓)酮(pirenzepine)化学名为5,6-二氢-6-氧代-11-(4-甲基-1-哌嗪基)乙酰基吡啶并[2,3-6][1,4]苯并二氮杂(艹卓)盐酸盐。本品是一种白色结晶性粉末,无臭、味苦、具引湿性,在水中易溶,乙醇中略溶。本品为抗胆碱药,对胃粘膜毒蕈胆碱受体具有高度选择性拮抗作用,减少胃酸的作用类似阿托品。关于其分析方法的研究报道很少。本文采用了酸性染料直接滴定法测定含量,并与紫外分光光度法进行了比较,结果较为满意。在一定PH条件下,有机碱类(B)可与氢离子结合成BH~,某些酸性染料解离为阴离子     

非水滴定法测定双嘧啶片和复方新诺明片中TMP、SD和SMZ的含量

先将样品乙酰化以消除主药之间的干扰,再用单纯形最优化法选择实验条件,不经分离提取,直接测定双嘧啶和复方新诺明片中TMP、SD、SMZ的含量。TMP回收率分别是99.68±0.17％,100.0±0.03％。双嘧啶片中SD和复方新诺明片中SMZ的回收率各为:99.97±0.10％,100.0±0.04％。     

CT自动管电流调节联合自适应迭代算法技术诊断肝血管瘤价值分析

目的 研究采取多层螺旋电子计算机断层扫描(CT)自动管电流调节(ATCM)和自适应迭代算法(ASIR)诊断肝血管瘤(HH)的临床价值.方法 2017年4月～2020年4月我院收治的HH患者144例,根据多层螺旋CT多期增强扫描预设噪声指数(NI)分为A组(平扫,NI设为9)、B组(动脉期,NI设为9)、C组(静脉期,N...     

Automatic interpretation and writing report of the adult waking electroencephalogram

Automatic interpretation of the EEG has so far been faced with significant difficulties because of a large amount of spatial as well as temporal information contained in the EEG, continuous fluctuation of the background activity depending on changes in the subject’s vigilance and attention level, the occurrence of paroxysmal activities such as spikes and spike-and-slow-waves, contamination of the EEG with a variety of artefacts and the use of different recording electrodes and montages. Therefore, previous attempts of automatic EEG interpretation have been focussed only on a specific EEG feature such as paroxysmal abnormalities, delta waves, sleep stages and artefact detection. As a result of a long-standing cooperation between clinical neurophysiologists and system engineers, we report for the first time on a comprehensive, computer-assisted, automatic interpretation of the adult waking EEG. This system analyses the background activity, intermittent abnormalities, artefacts and the level of vigilance and attention of the subject, and automatically presents its report in written form. Besides, it also detects paroxysmal abnormalities and evaluates the effects of intermittent photic stimulation and hyperventilation on the EEG. This system of automatic EEG interpretation was formed by adopting the strategy that the qualified EEGers employ for the systematic visual inspection. This system can be used as a supplementary tool for the EEGer’s visual inspection, and for educating EEG trainees and EEG technicians.     

Perte de capture par ischémie myocardique : à propos d’un cas

We report the case of a patient with pacemaker who presented chest pain during exercise followed by fainting. He has a history of arterial hypertension and diabetes. The initial examination was normal; the ventricular stimulation threshold was 1.125 volts (V) and cardiac enzymes were normal. Stress test has reproduced chest pain followed by loss of pacemaker capture and asystole. Coronary angiography showed a tight stenosis of the proximal anterior interventricular artery dilated by a drug-eluting stent. The control of stress test was normal. A stent thrombosis eight days later led to an acute coronary syndrome with recurrent syncope due to the loss of ventricular capture. The ventricular pacing threshold was then 2.25 V. After revascularization and stabilization of the patient's clinical status, this threshold returned to 1.125 V. This clinic case has confirmed that coronary artery disease could increase pacing threshold. It also highlights the usefulness of automatic capture algorithms in coronary patients. The stress test cannot only help to detect coronary artery disease but also allows the optimization of programming the pacemaker.     

安全加药全自动冲管套装子母输液瓶的设计及应用

用药安全和安全用药是临床护理管理的目标之一。静脉治疗是临床应用最广泛、使用最频繁的药物治疗手段。保障患者安全，规范静脉治疗，严把药物配伍禁忌关，提倡一瓶液体内最好只加一种药物。