不同类型正常乳腺表观扩散系数值差异的研究

目的 研究不同类型正常乳腺表观扩散系数（ADC）值的差异，探讨ADC值与组织学分型之间的关系。方法 采用单次激发平面回波（EPI）技术，扩散敏感因子（b）值分别为0、500、1000s／mm^2，对62个正常乳腺（包括42例乳腺病变患者的对侧正常乳腺及10名健康志愿者20个乳腺）进行MR扫描及MR扩散加权成像（DWI）检查，计算62个正常乳腺分别在不同b值时的ADC值。将62个正常乳腺分为3型，比较3型之间ADC值的差异及不同b值时ADC值的差异。结果 42例乳腺病变患者对侧正常乳腺的DWI及ADC图与组织切片对比，不同类型乳腺组织学结构不同，其DWI及ADC图表现亦有差异。62个正常乳腺分为致密型10个，分叶斑点型42个及退化型10个。致密型和分叶斑点型乳腺随b值降低ADC值升高，而退化型乳腺随b值降低ADC值变化不明显。b=1000—0s／mm^2时，致密型、分叶斑点型、退化型乳腺ADC值分别为（1．70±0．37）、（1．93±0．46）、（1．18±0．65）×10^-3mm^2／s，3组间比较差异有统计学意义（F=12．998，P=0．000）。不同b值时每2种类型间进行单因素方差分析，致密型和分叶斑点型之间差异无统计学意义（F=2．167，P=0．147）；致密型和退化型之间、分叶斑点型和退化型之间差异均有统计学意义（F值分别为5．593、19．128，P值分别为0．029、0．000）。结论 3型正常乳腺ADC值受乳腺组织学结构的影响，致密型和分叶斑点型乳腺ADC值受b值高低的影响。     

一种简单实用的测量气管截面积的方法

目的介绍一种简单实用而较精确的测量狭窄气管截面积的方法.方法利用纤维支气管镜、测长器、模拟气管等制作并校正测量标尺,并利用该标尺测量了3例气管状况异常患者的气管某一截面面积.结果用校正过的4种测量标尺测量了10个模拟气管的直径,和实测真值比较经t检验分析无显著性差异,利用上述标尺测量的3个患者的目的截面面积分别为约96 mm2、 105 mm2和192 mm2.结论本方法提供了一种简单、快速而又较精确的测量大气道某一截面面积的方法,为定量评价患者的通气功能、选择气管支架或采用其他干预手段处理气管病变提供了数据参考.     

Retrospective review of the preoperative biliary and gastrointestinal evaluation for gastric bypass surgery

BACKGROUND: The purpose of this study was to analyze the frequency and results of preoperative biliary and gastrointestinal (GI) evaluation of patients undergoing Roux-en-Y gastric bypass (RYGB). METHODS: Retrospective review of the preoperative evaluation of 144 consecutive RYGB patients. RESULTS: Cholecystectomy had already been performed in 43 (30%) patients; 22% of those patients with an intact gallbladder had cholelithiasis. Ten patients (7%) had an upper GI x-ray (UGI), and 94 patients (65%) had an esophagogastroduodenoscopy (EGD). Abnormalities were found in 40% of the UGIs and 84% of the EGDs. A total of 96 patients (67%) were tested for Helicobacter pylori; 11% were positive. Twenty-one patients (15%) underwent preoperative colonoscopy; 48% were abnormal, but most of the abnormalities were not clinically significant. Three patients had barium enema x-ray, which was normal in all cases. CONCLUSIONS: The preoperative biliary and GI evaluation of bariatric surgery patients should include a routine ultrasound of the gallbladder. Routine preoperative EGD will detect a significant number of abnormalities that should be treated, but should rarely alter the bariatric surgical procedure or result in denial of bariatric surgery. Many abnormalities will be asymptomatic. Patients should be routinely screened for H. pylori and, if positive, treated before bariatric surgery. Lower GI evaluation should be performed selectively based on the patient's symptoms, physical findings, and guidelines for colorectal cancer and polyp screening.     

128例老年胃癌患者围手术期临床特点分析及护理对策

目的：提高对老年胃癌患者围术期护理的认识。方法：对128例≥65岁胃癌患者与同期〈65岁212例胃癌患者围术期各方面资料进行对比分析。结果：≥65岁组术前合并症多，全胃及联合脏器切除比例高、创伤大，术后非手术相关并发症多，患者文化水平较低，社会支持水平低。结论：对老年胃癌患者应重视术前的全面评估和充分准备，争取和利用患者的社会支持系统，采取灵活多样的形式进行健康教育，术后重视呼吸系统、心血管系统并发症及手术相关并发症（吻合口瘙、胃排空障碍、胰腺炎、胸腔积液或腹腔积液等）的预防和护理。     

Surface modification of titanium by etching in concentrated sulfuric acid

OBJECTIVE: The purpose of this study was to characterize the etching behavior of titanium in concentrated sulfuric acid and discuss its application on surface modification of titanium for biological use. METHODS: Commercially pure titanium (cpTi) plate was etched in 48% H2SO4 at RT -90 degrees C for 0.25-8 h. The weight loss was derived from the weight differences before and after etching. The surfaces after etching were characterized by surface roughness, X-ray diffractometry, and scannning electron spectroscopy. The apparent activation energy of the dissolution of cpTi into acid was derived from an Arrhenius plot of the rate of weight loss versus the acid temperature. RESULTS: The surface roughness of cpTi increased with the acid temperature and etching time. The surface roughness was strongly related to the weight loss. The weight loss increased drastically with the acid temperature after an initial period, which shortened with increasing acid temperature. The apparent activation energy for the dissolution of cpTi in H2SO4 was derived as 67.8 kJ/mol. SIGNIFICANCE: This study indicates that etching with concentrated sulfuric acid is an effective way to modify the surface of titanium for biological applications.     

胃癌全胃切除术后消化道重建方式的选择

目的：探讨全胃切除术后较理想的消化道重建方式。方法：对近6年来122例施行全胃切除术患者的临床资料进行回顾性分析。全胃切除后消化道重建分别采用全胃切除术后消化道重建Orr式Roux-en-Y食管空肠吻合术、P型空肠袢食管空肠Roux-en-Y吻合术和远端空肠反口贮袋的Roux-en-Y食管空肠吻合术。结果：3种术式在食后烧灼感、进食量、进食次数、体重下降、倾倒综合征、血红蛋白、白蛋白等指标的比较，无明显差异（均P>0.05）。P型空肠袢食管空肠Roux-en-Y吻合术组所用手术时间显著多于Orr组及反口组（P<0.05）。反口组的贮袋大小及半排空时间显著优于Orr组及P袢组（P<0.05）。结论：远端空肠反口贮袋的Roux-en-Y吻合术是一种值得推荐的新型全胃切除术后消化道重建方法。     

He-Ne激光沿经络自动照射治疗仪的研制

介绍He-Ne激光沿经络自动照射治疗仪，它能使激光光束按人们所需要的强度，路径，方式沿经络进行自动照射。     

Image processing in swallowing and speech research

An image processing system for application to studies of the temporal and spatial parameters of movement during swallowing and speech is described. Image sequences from videotape are digitized for computerized manipulation and analysis in an attempt to improve on conventional visual inspection. The system is “interactive” or “event-driven”: after executing a function, the computer waits for guidance from the user who controls the program through keyboard and mouse input, selecting options from menus and responding to prompts. The analyst alters image clarity by the application of filters and heightens contrast through video enhancement. A technique called “remapping” reduces head motion and provides uniform spatial scaling. Animated sequences of images are used, as opposed to frame-by-frame analysis, to preserve temporal context and increase efficiency of measurement. Low cost off-the-shelf personal computer hardware is used along with original software tailored to the application.     

TJS全数字脑电工作站在空军招飞体检中的应用研究

随着科学技术的不断进步,为了尽快适应新形势的发展,招飞体检中我们在脑电图(dectroencephalogram,EEG)检测方面使用了电子计算机技术,并对新仪器应用于脑功能检测工作的价值进行了相关的研究,现报告如下: