• 【使用MR数字减影血管造影评估儿童颅内病变的血液供应。】 复制标题 收藏 收藏
    DOI:10.1007/s00247-006-0268-1 复制DOI
    作者列表:Chooi WK,Connolly DJ,Coley SC,Griffiths PD
    BACKGROUND & AIMS: BACKGROUND:MR digital subtraction angiography (MR-DSA) is a contrast-enhanced MR angiographic sequence that enables time-resolved evaluation of the cerebral circulation. OBJECTIVE:We describe the feasibility and technical success of our attempts at MR-DSA for the assessment of intracranial pathology in children. MATERIALS AND METHODS:We performed MR-DSA in 15 children (age range 5 days to 16 years) referred for MR imaging because of known or suspected intracranial pathology that required a dynamic assessment of the cerebral vasculature. MR-DSA consisted of a thick (6-10 mm) slice-selective RF-spoiled fast gradient-echo sequence (RF-FAST) acquired before and during passage of an intravenously administered bolus of Gd-DTPA. The images were subtracted and viewed as a cine loop. RESULTS:MR-DSA was performed successfully in all patients. High-flow lesions were shown in four patients; these included vein of Galen aneurysmal malformation, dural fistula, and two partially treated arteriovenous malformations (AVMs). Low-flow lesions were seen in three patients, all of which were tumours. Normal flow was confirmed in eight patients including two with successfully treated AVMs, and in three patients with cavernomas. CONCLUSION:Our early experience suggests that MR-DSA is a realistic, non-invasive alternative to catheter angiography in certain clinical settings.
    背景与目标: 背景:MR数字减影血管造影(MR-DSA)是一种对比增强的MR血管造影序列,可对脑循环进行时间分辨评估。
    目的:我们描述了MR-DSA评估儿童颅内病理的尝试的可行性和技术成功。
    材料与方法:由于已知或疑似颅内病理,需要动态评估脑血管,我们对15例接受MR成像的儿童(年龄范围5天至16岁)进行了MR-DSA检查。 MR-DSA由厚的(6-10 mm)切片选择性RF破坏的快速梯度回波序列(RF-FAST)组成,在静脉内给予Gd-DTPA推注之前和期间均已获得。减去图像并将其视为电影循环。
    结果:所有患者均成功进行了MR-DSA检查。四名患者出现高流量病灶。其中包括Galen动脉瘤畸形静脉,硬脑膜瘘和两个经过部分治疗的动静脉畸形(AVM)。在三名患者中均发现了低流量病变,所有这些都是肿瘤。在八名患者中确认了正常血流,其中包括两名成功治疗过的AVM和三名患有海绵状瘤的患者。
    结论:我们的早期经验表明,在某些临床情况下,MR-DSA是导管血管造影术的一种现实的,非侵入性的替代方法。
  • 【视频内镜经肛门直肠肿瘤切除术。】 复制标题 收藏 收藏
    DOI:10.1016/S0002-9610(97)00076-7 复制DOI
    作者列表:Swanstrom LL,Smiley P,Zelko J,Cagle L
    BACKGROUND & AIMS: BACKGROUND:Transanal resection of benign and selected malignant rectal tumors is a well accepted surgical technique. The use of a stereoscopic microsurgical technique, as originally described by Buess et al in 1984, has been shown to improve the results of standard transanal resection by allowing precise, full thickness resections up to 24 cm from the anal verge. Transanal endoscopic microsurgery (TEM) has failed to gain widespread popularity for two reasons: The proprietary instrument set is expensive and complex ($68,000 and 30 components), and the procedure is difficult to master technically. We present our results with a modification of the TEM instrument that incorporates a standard laparoscope and video camera as well as standard laparoscopic instruments.

    METHODS:Four surgeons have been trained to date. Details of the training curriculum are presented. The technique of videoendoscopic transanal tumor resection (VTEM) is described. A prospective data base was maintained of all VTEM cases. This was reviewed for this study to determine indications, operative times, complications and outcomes.

    RESULTS:Four surgeons performed 27 VTEM cases between August 1994 and June 1996. The average age was 69 years and the majority (16) of patients were ASA III. Pre-op diagnosis was benign polyp in 25 patients and adenocarcinoma in 2. Average operating time was 127 minutes (49 to 280 minutes), and was longer during a surgeon's first 5 cases and for lesions more than 16 cm from the anal verge. Operative problems were rare (4%) and post-op complications (incontinence 2, late bleeding 1, adenoma recurrence 1) were seen in 15%.

    CONCLUSIONS:VTEM can be taught successfully to GI and colorectal surgeons using a format similar to that used for advanced laparoscopic courses. The use of already available laparoscopes and instruments decreases the initial costs of the set-up. Results are good, with low rates of complications and recurrence and a very short hospital stay. The patient benefits from an effective, minimally invasive alternative to open surgery.

    背景与目标: 背景:经肛门切除良性和恶性直肠肿瘤是一种广为接受的手术技术。如Buess等人在1984年最初描述的,使用立体显微外科技术已显示可通过允许距肛门边缘长达24 cm的精确,全层切除来改善标准经肛门切除的结果。经肛门内窥镜显微外科手术(TEM)未能获得广泛的普及,其原因有两个:专有的器械套件昂贵且复杂(68,000美元,包含30个组件),并且该过程在技术上难以掌握。我们通过修改TEM仪器(结合标准腹腔镜和摄像机以及标准腹腔镜仪器)展示我们的结果。

    方法:到目前为止,已经培训了四名外科医生。介绍了培训课程的详细信息。描述了视频内镜经肛门肿瘤切除术(VTEM)的技术。保留了所有VTEM病例的前瞻性数据库。

    结果:1994年8月至1996年6月,四名外科医生进行了27例VTEM病例。平均年龄为69岁。年,大多数(16)患者为ASA III。术前诊断为良性息肉25例,腺癌2例。平均手术时间为127分钟(49至280分钟),在外科医生的前5例中以及距肛门边缘16厘米以上的病变中,手术时间更长。手术中很少有手术问题(4%),术后并发症(尿失禁2,晚期出血1,腺瘤复发1)占15%。

    结论:可以教VTEM使用类似于高级腹腔镜课程的格式成功地向胃肠道和结直肠外科医生使用。使用已经可用的腹腔镜和仪器可降低安装的初始成本。结果良好,并发症和复发率低,住院时间很短。患者可以从有效,微创的替代开放手术中受益。

  • 【偏振光显微镜和数字图像处理可识别仓鼠透明带的多层结构。】 复制标题 收藏 收藏
    DOI:10.1093/humrep/12.6.1250 复制DOI
    作者列表:Keefe D,Tran P,Pellegrini C,Oldenbourg R
    BACKGROUND & AIMS: The zona pellucida (zona) is a glycoprotein coat that envelopes the oocyte and embryo, binds sperm during fertilization and facilitates transfer of the embryo through the Fallopian tube. Before implantation can occur, the blastocyst must hatch from the zona. Several lines of evidence suggest that the zona is multilaminar. We hypothesized that the multilaminar structure of the zona filaments could be imaged non-destructively with the polarized light microscope. A recent modification of the polarized light microscope (pol-scope), which combines innovations in polarization optics with novel image processing software, allows measurement of birefringence at all points of the image. Hamster metaphase II oocytes were placed on glass coverslips which replaced the bottom of culture dishes, imaged under differential interference contrast (DIC) and pol-scope optics, then digitized and processed to measure birefringence magnitude and orientation. The pol-scope revealed the zona to be divided into outer and inner layers separated by a zone of low retardance. This finding is consistent with filaments in the outer layer oriented tangentially and in the inner layer oriented radially. The multilaminar structure of the mammalian zona suggested by differential lectin binding and by scanning electron microscopy could be imaged non-destructively with the pol-scope. Because the pol-scope provides a non-destructive method to identify macro-molecular organization of the zona, it may prove useful in developmental studies of hatching and to direct resection of the zona.

    背景与目标: 透明带(zona)是一种糖蛋白涂层,覆盖卵母细胞和胚胎,在受精过程中结合精子,并促进胚胎通过输卵管转移。在发生植入之前,胚泡必须从透明带孵化出来。有几条证据表明,透明带是多层的。我们假设可以使用偏振光显微镜对透明带的多层结构进行无损成像。偏振光显微镜(pol-scope)的最新改进将偏振光学的创新与新颖的图像处理软件结合在一起,可以测量图像所有点的双折射。将仓鼠中期II卵母细胞放在玻璃盖玻片上,该盖玻片代替培养皿的底部,在微分干涉对比(DIC)和pol-scope光学下成像,然后进行数字化处理,以测量双折射的大小和方向。 pol镜显示,透明带分为外层和内层,并由低延迟区隔开。这一发现与切向取向的外层和径向取向的内层中的长丝一致。差异凝集素结合和扫描电子显微镜表明的哺乳动物透明带的多层结构可以用pol镜无损成像。因为pol镜提供了一种非破坏性的方法来识别透明带的大分子组织,所以它可能在孵化的发育研究和直接切除透明带中很有用。

  • 【具有自动聚焦功能的对面数字全息显微镜。】 复制标题 收藏 收藏
    DOI:10.1038/s41598-017-04568-x 复制DOI
    作者列表:Zheng J,Gao P,Shao X
    BACKGROUND & AIMS: :Digital holographic microscopy (DHM) has its intrinsic ability to refocusing a sample by numerically propagating an object wave from its hologram plane to its image plane. In this paper opposite-view digital holographic microscopy (OV-DHM) is demonstrated for autofocusing, namely, digitally determining the location of the image plane, and refocusing the object wave without human intervention. In OV-DHM, a specimen is illuminated from two sides in a 4π-alike configuration, and two holograms are generated and recorded by a CCD camera along two orthogonal polarization orientations. The image plane of the sample is determined by finding the minimal variation between the two object waves, and consequently refocusing is performed by propagating the waves to the image plane. Furthermore, the field of view (FOV) of OV-DHM can be extended by combining the two object waves which have an angle in-between. The proposed technique also has the potential to reduce speckle noise and out-of-focus background.
    背景与目标: 数字全息显微镜(DHM)具有通过将物波从其全息图平面数字传播到其图像平面来重新聚焦样品的固有能力。在本文中,对视图数字全息显微镜(OV-DHM)进行了自动聚焦演示,即以数字方式确定图像平面的位置,并在无需人工干预的情况下重新聚焦物波。在OV-DHM中,标本从两侧以4π相似的配置进行照明,然后由CCD相机沿着两个正交的偏振方向生成并记录两个全息图。通过找到两个物波之间的最小变化来确定样本的图像平面,因此,通过将波传播到图像平面来执行重新聚焦。此外,可以通过组合在两者之间具有一定角度的两个物波来扩展OV-DHM的视场(FOV)。所提出的技术还具有减少斑点噪声和离焦背景的潜力。
  • 【一种创新的流式视频系统,带有视点摄像头,可将手术传输至智能手机和平板电脑:一种教育工具。】 复制标题 收藏 收藏
    DOI:10.1177/1553350617715162 复制DOI
    作者列表:Chaves RO,de Oliveira PAV,Rocha LC,David JPF,Ferreira SC,Santos AASD,Melo RMDS,Yasojima EY,Brito MVH
    BACKGROUND & AIMS: PURPOSE:In order to engage medical students and residents from public health centers to utilize the telemedicine features of surgery on their own smartphones and tablets as an educational tool, an innovative streaming system was developed with the purpose of streaming live footage from open surgeries to smartphones and tablets, allowing the visualization of the surgical field from the surgeon's perspective. The current study aims to describe the results of an evaluation on level 1 of Kirkpatrick's Model for Evaluation of the streaming system usage during gynecological surgeries, based on the perception of medical students and gynecology residents. METHODS:Consisted of a live video streaming (from the surgeon's point of view) of gynecological surgeries for smartphones and tablets, one for each volunteer. The volunteers were able to connect to the local wireless network, created by the streaming system, through an access password and watch the video transmission on a web browser on their smartphones. Then, they answered a Likert-type questionnaire containing 14 items about the educational applicability of the streaming system, as well as comparing it to watching an in loco procedure. This study is formally approved by the local ethics commission (Certificate No. 53175915.7.0000.5171/2016). RESULTS:Twenty-one volunteers participated, totalizing 294 items answered, in which 94.2% were in agreement with the items affirmative, 4.1% were neutral, and only 1.7% answers corresponded to negative impressions. Cronbach's α was .82, which represents a good reliability level. Spearman's coefficients were highly significant in 4 comparisons and moderately significant in the other 20 comparisons. CONCLUSIONS:This study presents a local streaming video system of live surgeries to smartphones and tablets and shows its educational utility, low cost, and simple usage, which offers convenience and satisfactory image resolution, thus being potentially applicable in surgical teaching.
    背景与目标: 目的:为了吸引来自公共卫生中心的医学生和居民在他们自己的智能手机和平板电脑上利用外科手术的远程医疗功能作为教育工具,开发了一种创新的流媒体系统,其目的是将现场录像从开放式手术流向智能手机。和平板电脑,可以从外科医生的角度看到手术区域。本研究旨在根据医学生和妇科住院医师的看法,描述对柯克帕特里克妇科手术流系统使用率评估模型第1级的评估结果。
    方法:由智能手机和平板电脑的妇科手术的实时视频流(从外科医生的角度来看)组成,每位志愿者一个。志愿者们能够通过访问密码连接到流系统创建的本地无线网络,并在智能手机的网络浏览器上观看视频传输。然后,他们回答了一个Likert型问卷,其中包含14个有关流系统的教育适用性的项目,并将其与观看本地程序进行了比较。这项研究已获得当地伦理委员会的正式批准(证书编号53175915.7.0000.5171 / 2016)。
    结果:21名志愿者参加,总共回答294项,其中94.2%与肯定的回答相符,中立的占4.1%,只有1.7%的回答与负面印象相对应。 Cronbach的α为0.82,表示良好的可靠性水平。 Spearman系数在4个比较中高度显着,在其他20个比较中适度。
    结论:本研究为智能手机和平板电脑提供了实时手术的本地流式视频系统,并显示了其教育实用性,低成本和简单易用的特点,提供了便利和令人满意的图像分辨率,因此有可能应用于外科教学。
  • 【学龄前儿童使用数字饮食估算方法的有效性。】 复制标题 收藏 收藏
    DOI:10.1016/j.jand.2017.05.005 复制DOI
    作者列表:Nicklas T,Islam NG,Saab R,Schulin R,Liu Y,Butte NF,Apolzan JW,Myers CA,Martin CK
    BACKGROUND & AIMS: BACKGROUND:The validity of using the Remote Food Photography Method (RFPM) for measuring food intake of minority preschool children's intake is not well documented. OBJECTIVE:Our aim was to determine the validity of intake estimations made by human raters using the RFPM compared with those obtained by weighing all foods and beverages consumed by 3- to 5-year-old children (weighed method). DESIGN:We conducted a cross-sectional observational study. PARTICIPANTS/SETTINGS:A convenience sample of 54 3- to 5-year-old Hispanic and African-American children were observed during a 12-hour period at Baylor Metabolic Research Unit between June 2013 and January 2014. MAIN OUTCOME MEASURES:All foods/beverages consumed by the children were provided by Baylor research coordinators who took and wirelessly transmitted before-and-after pictures of the trays to trained human raters at the Pennington Biomedical Research Center who estimated grams consumed. Energy and macronutrients were calculated using the Food and Nutrient Database for Dietary Studies or food facts data provided by manufacturers. STATISTICAL ANALYSES:Paired t test, mean differences, and Bland-Altman limits of agreement were performed. RESULTS:Compared to the weighed method, the rater method significantly overestimated total intake by 34±71 g (P<0.0001), with a mean percent error of 2.9% (root mean square error=7.1%), and total energy intake by 75±102 kcal (P<0.0001), with a mean percent error of 7.5% (root mean square error=12.3%). The standard error for the macronutrient intakes ranged from 11.0% to 20.2%. The Bland-Altman approach demonstrated a positive slope for the rater method relative to the weighed method for total intake in grams (P=0.006), carbohydrate (P=0.01), and protein (P=0.01) (ie, magnitude of the bias increased with increasing intakes). CONCLUSIONS:The rater method overestimated total intake in grams and energy in kilocalories in minority preschool children in a well-controlled condition and needs to be further tested in a free-living environment.
    背景与目标: 背景:使用远程食物摄影法(RFPM)来测量少数学龄前儿童的食物摄入量的有效性尚未得到充分证明。
    目的:我们的目的是确定与使用3至5岁儿童对所有食品和饮料进行称重(称重法)得出的结果相比,使用RFPM进行的人类评估者对摄入量所作估计的有效性。
    设计:我们进行了横断面观察研究。
    参与者/地点:2013年6月至2014年1月期间,在12个小时的时间里,在贝勒代谢研究室观察了54名3至5岁的西班牙裔和非裔美国人儿童的便利样本。
    主要观察指标:儿童食用的所有食物/饮料均由贝勒研究协调员提供,他们将托盘的照片前后无线传输至Pennington生物医学研究中心的受过训练的人类评估者,他们估计食用的克数。使用饮食研究的食物和营养数据库或制造商提供的食物事实数据计算能量和大量营养素。
    统计分析:进行配对t检验,均数差和Bland-Altman一致性极限。
    结果:与称量方法相比,评估者方法显着高估了总摄入量34±71 g(P <0.0001),平均百分比误差为2.9%(均方根误差= 7.1%),总能量摄入为75 ±102 kcal(P <0.0001),平均误差为7.5%(均方根误差为12.3%)。大量营养素摄入的标准误为11.0%至20.2%。 Bland-Altman方法显示评估者方法相对于总摄入量(克)(P = 0.006),碳水化合物(P = 0.01)和蛋白质(P = 0.01)(即偏差的大小)的加权方法具有正斜率随着摄入量的增加而增加)。
    结论:评估者方法高估了少数学龄前儿童在良好控制条件下的总摄入量(以克为单位)和以卡路里为单位的能量(以卡路里为单位),需要在自由生活的环境中进行进一步的测试。
  • 【使用几何约束通过特征定位从内窥镜视频进行三维建模。】 复制标题 收藏 收藏
    DOI:10.1109/TBME.2006.889767 复制DOI
    作者列表:Wu CH,Sun YN,Chang CC
    BACKGROUND & AIMS: :The endoscope is a popular imaging modality used in many preevaluations and surgical treatments, and is also one of the essential tools in minimally invasive surgery. However, regular endoscopes provide only 2-D images. Even though stereoendoscopy systems can display 3-D images, the real anatomical structure of the observed lesion is unavailable and can only be judged by the surgeon's imagination. In this paper, we present a constraint-based factorization method for reconstructing 3-D structures registered to the patient, from 2-D endoscopic images. The proposed method incorporates the geometric constraints from the tracked surgical instrument into the traditional factorization method based on frame-to-frame feature motion on the endoscopically viewed scene. Experiments with real and synthetic data demonstrate good real-scale 3-D extraction, with greater accuracy than is available from traditional methods. The reconstruction process can also be accomplished in a few seconds, making it suitable for on-line surgical applications to provide surgeons with additional 3-D shape information, critical distance monitoring and warnings.
    背景与目标: :内窥镜是在许多预评估和手术治疗中使用的流行成像方式,也是微创手术中必不可少的工具之一。但是,常规内窥镜仅提供2D图像。即使立体内窥镜系统可以显示3D图像,所观察到的病变的真实解剖结构也不可用,只能由外科医生的想象力来判断。在本文中,我们提出了一种基于约束的因式分解方法,用于从2-D内窥镜图像重建注册给患者的3-D结构。所提出的方法将来自被跟踪的手术器械的几何约束纳入基于内窥镜观察场景中帧到帧特征运动的传统分解方法中。使用真实数据和合成数据进行的实验表明,可以进行良好的真实3D提取,其准确性要高于传统方法。重建过程也可以在几秒钟内完成,使其适用于在线手术应用,从而为外科医生提供额外的3-D形状信息,关键距离监控和警告。
  • 【浴室电子秤和血压计在量化数字后前脊髓压强时的可靠性和并行性。】 复制标题 收藏 收藏
    DOI:10.3233/THC-130741 复制DOI
    作者列表:Teslim OA,Olayinka A,Michael E,Adesoji AR,Oluwole AT
    BACKGROUND & AIMS: PURPOSE:The main objective of this study was to determine the reliability and concurrent validity of using Modified Sphygmomanometer (sphyg) and body weighing scale to determine the magnitude of pressure and body weight change during digital spinal examination. SUBJECTS:One hundred and twenty apparently healthy subjects were recruited. METHODS:Weighing scale was used to measure the body weight of the investigator while Mercury sphygmomanometer was used to measure the pressure exerted. There was test re-test interval of 2 weeks. Data were analysed by descriptive statistic and Pearson product moment correlation. RESULTS:The result showed that there was significant correlation between the weight change (WC) values obtained on the weighing scale on day 1 and 2 (r=0.91). Also, there was significant correlation between Pressure obtained in the sphygmomanometer on day 1 and 2 (r=0.94). Similarly, there was significant correlation between the WC and Pressure Change (PC), (r=-0.49). The participant's age, height, weight and BMI contributed significantly as predictors for both BWC and PC change respectively. CONCLUSION:This study concluded that weighing scale and Mercury sphygmomanometer are reliable and valid to determine the magnitude of pressure applied during DPAP.
    背景与目标: 目的:本研究的主要目的是确定使用改良血压计和体重计确定数字化脊柱检查过程中压力和体重变化幅度的可靠性和同时有效性。
    受试者:招募了一百二十名看起来健康的受试者。
    方法:用体重计测量研究者的体重,用水银血压计测量施加的压力。重新测试间隔为2周。通过描述性统计和皮尔逊乘积矩相关性分析数据。
    结果:结果表明,第1天和第2天在体重秤上获得的体重变化(WC)值之间存在显着相关性(r = 0.91)。同样,第1天和第2天在血压计中获得的压力之间也存在显着相关性(r = 0.94)。同样,WC和压力变化(PC)之间也存在显着相关性(r = -0.49)。参与者的年龄,身高,体重和BMI分别是BWC和PC改变的预测指标。
    结论:本研究得出结论,称重秤和水银血压计对于确定DPAP期间施加的压力大小是可靠且有效的。
  • 9 Aggressive digital papillary adenocarcinoma. 复制标题 收藏 收藏

    【侵袭性数字乳头状腺癌。】 复制标题 收藏 收藏
    DOI:10.1016/0190-9622(90)70215-4 复制DOI
    作者列表:Ceballos PI,Penneys NS,Acosta R
    BACKGROUND & AIMS: :Aggressive digital papillary adenocarcinoma is a rare neoplasm of eccrine sweat gland origin. An acral location and a high recurrence rate are characteristic features. Its histopathologic features are distinctive, and the tumor expresses carcinoembryonic and S-100 protein antigens. We demonstrated immunoreactivity of the tumor to ferritin antibody, a new immunohistologic marker for sweat gland malignancies.
    背景与目标: :侵袭性数字乳头状腺癌是内分泌汗腺起源的罕见肿瘤。骨部位和高复发率是特征性特征。其组织病理学特征是独特的,并且肿瘤表达癌胚和S-100蛋白抗原。我们证明了肿瘤对铁蛋白抗体的免疫反应性,铁蛋白抗体是汗腺恶性肿瘤的一种新的免疫组织学标记。
  • 【平视手术中数字图像增强的定量评估。】 复制标题 收藏 收藏
    DOI:10.1038/s41598-019-52492-z 复制DOI
    作者列表:Akiyama K,Watanabe K,Fukui M,Higuchi H,Noda T
    BACKGROUND & AIMS: :Image-processing is an advantage of heads-up surgery and expected to facilitate ophthalmic surgeries. To evaluate image-processing quantitatively, we analyzed the surgical images of twenty eyes that underwent vitrectomy with internal limiting membrane (ILM) peeling assisted by Brilliant Blue G (BBG). Still images of the peeling procedure were obtained from the surgical video, and the color difference was calculated between two adjacent spots inside and outside the ILM-peeling contour, i.e., without and with BBG staining, respectively. The color differences were compared between the two settings with and without image-processing, delivered by an algorithm to enhance the color and contrast. Color differences were calculated using two methods: the Euclidean distance based on RGB values (RGB distance) and the Delta-E00 formula provided by the International Commission on Illumination. In five cases, minimum light intensities required to recognize the contour of ILM-peeling were compared during surgeries between the two settings with and without enhancement. Image-processing increased the mean color difference significantly (P < 0.001) from 15.47 and 4.49 to 34.03 and 8.00, respectively, for the RGB distance and Delta-E00. The minimum light intensity was reduced from 15 to 5 on average by image-enhancement. These results showed image-processing enhances color differences and reduces light intensities during vitrectomy.
    背景与目标: :图像处理是平视手术的一个优势,有望促进眼科手术。为了定量评估图像处理,我们分析了二十只眼睛的手术图像,这些眼睛接受了玻璃内切除术,并用Brilliant Blue G(BBG)辅助进行了内部限制膜(ILM)剥离。从外科手术视频中获得了脱皮过程的静止图像,并计算了ILM脱皮轮廓的内部和外部两个相邻点之间的色差,即分别不使用BBG染色和使用BBG染色。通过算法来增强色彩和对比度,比较了在有图像处理和没有图像处理的两种设置之间的色差。使用两种方法计算色差:基于RGB值的欧几里德距离(RGB距离)和国际照明委员会提供的Delta-E00公式。在五种情况下,在手术过程中,在有和没有增强的情况下,在两种设置之间比较了识别ILM剥离轮廓所需的最小光强度。对于RGB距离和Delta-E00,图像处理将平均色差分别从15.47和4.49显着增加(P <0.001)到34.03和8.00。通过图像增强,最小光强度平均从15降低到5。这些结果表明,在玻璃体切割术中,图像处理可增强色差并降低光强度。
  • 【数字病理和转录组学分析的整合将肿瘤浸润淋巴细胞的空间密度与对BRAF抑制剂的临床反应联系起来。】 复制标题 收藏 收藏
    DOI:10.3389/fonc.2020.00757 复制DOI
    作者列表:Ziemys A,Kim M,Menzies AM,Wilmott JS,Long GV,Scolyer RA,Kwong L,Holder A,Boland G
    BACKGROUND & AIMS: :Metastatic melanoma is one of the most immunogenic malignancies due to its high rate of mutations and neoantigen formation. Response to BRAF inhibitors (BRAFi) may be determined by intratumoral immune activation within melanoma metastases. To evaluate whether CD8+ T cell infiltration and distribution within melanoma metastases can predict clinical response to BRAFi, we developed a methodology to integrate immunohistochemistry with automated image analysis of CD8+ T cell position. CD8+ distribution patterns were correlated with gene expression data to identify and quantify "hot" areas within a tumor. Furthermore, the relative activation of CD8+cells, based on transcriptomic analysis, and their relationship to other CD8+ T cells and non-CD8+ cells within the tumor suggested a less crowded distribution of cells around activated CD8+ T cells. Furthermore, the relative activation of these CD8+ T cells was associated with improved clinical outcomes and decreased tumor cell proliferation. This study demonstrates the potential of digital pathomics to incorporate immune cell spatial distribution within metastases and RNAseq analysis to predict clinical response to BRAF inhibition in metastatic melanoma.
    背景与目标: :转移性黑素瘤由于其高突变率和新抗原形成而成为最具免疫原性的恶性肿瘤之一。对BRAF抑制剂(BRAFi)的反应可以通过黑色素瘤转移瘤内的肿瘤内免疫激活来确定。为了评估黑色素瘤转移中CD8 T细胞的浸润和分布是否可以预测对BRAFi的临床反应,我们开发了一种方法,将免疫组织化学与CD8 T细胞位置的自动图像分析相结合。 CD8分布模式与基因表达数据相关联,以鉴定和量化肿瘤内的“热”区域。此外,基于转录组学分析,CD8细胞的相对活化及其与肿瘤内其他CD8 T细胞和非CD8细胞的关系表明,活化的CD8 T细胞周围的细胞分布较少。此外,这些CD8 T细胞的相对活化与改善的临床结果和减少的肿瘤细胞增殖有关。这项研究证明了数字病理学在转移中结合免疫细胞空间分布和RNAseq分析来预测转移性黑色素瘤对BRAF抑制的临床反应的潜力。
  • 【评估护理学学生的在线解剖学和生理学数字混合学习模式。】 复制标题 收藏 收藏
    DOI:10.1097/CIN.0000000000000639 复制DOI
    作者列表:Barbagallo MS,Porter JE,Lamunu M
    BACKGROUND & AIMS: :Blended online and digital learning includes a variety of activities that combine engaging classroom-based education with online learning. The aim of this study is to evaluate undergraduate students' perceptions of a blended online and digital curriculum for anatomy and physiology in the nursing degree program. A quantitative methodology was used with a sample of 100 undergraduate nursing students from a single Australian University. Descriptive statistics are and presented in this article. Of the 100 participants, 90% were enrolled in the standard mode compared to 10% in a flexible mode of delivery. Results indicated that 29% of participants preferred laboratory classes as having the most impact. Participants (46%) also agreed that recorded lectures were useful, with 36% indicating that the online platform was easy to navigate going as far as wanting more online quizzes (49%). More than half of the participants (54%) acknowledged that anatomy and physiology was important for their future careers. The blended online and digital learner preferences in delivering anatomy and physiology-related courses should be adjusted in order for learning to be effective for undergraduate students in the future.
    背景与目标: :混合的在线和数字学习包括将课堂教学与在线学习相结合的各种活动。这项研究的目的是评估本科生对护理学位课程中有关解剖学和生理学的在线和数字混合课程的看法。定量方法用于来自单个澳大利亚大学的100名本科护理学生的样本。本文将介绍描述性统计信息。在100名参与者中,有90%以标准模式注册,而在灵活交付模式中则为10%。结果表明,有29%的参与者更喜欢实验室课程,因为其影响最大。参与者(46%)也同意录制的讲座非常有用,有36%的参与者表示,在线平台易于浏览,甚至需要更多在线测验(49%)。一半以上的参与者(54%)承认,解剖学和生理学对他们的未来职业很重要。应调整在线和数字学习者在提供解剖学和生理学相关课程方面的偏好,以使学习在将来对本科生有效。
  • 【用于数字组织反卷积的损失函数学习。】 复制标题 收藏 收藏
    DOI:10.1089/cmb.2019.0462 复制DOI
    作者列表:Görtler F,Schön M,Simeth J,Solbrig S,Wettig T,Oefner PJ,Spang R,Altenbuchinger M
    BACKGROUND & AIMS: : The gene expression profile of a tissue averages the expression profiles of all cells in this tissue. Digital tissue deconvolution addresses the following inverse problem: given the expression profile y of a tissue, what is the cellular composition c of that tissue? If X is a matrix whose columns are reference profiles of individual cell types, the composition c can be computed by minimizing ℒ ( y - X c ) for a given loss function ℒ . Current methods use predefined all-purpose loss functions. They successfully quantify the dominating cells of a tissue, while often falling short in detecting small cell populations. In this study we use training data to learn the loss function ℒ along with the composition c . This allows us to adapt to application-specific requirements such as focusing on small cell populations or distinguishing phenotypically similar cell populations. Our method quantifies large cell fractions as accurately as existing methods and significantly improves the detection of small cell populations and the distinction of similar cell types.
    背景与目标:
    组织的基因表达谱将组织中所有细胞的表达谱平均化。数字组织反卷积解决了以下反问题:给定表达谱
    ÿ
    组织的细胞组成是什么
    C
    那张纸巾?如果
    X
    是一个矩阵,其列是各个细胞类型,组成的参考资料
    C
    可以通过最小化来计算





    ÿ
    --
    X
    C




    对于给定的损失函数



    。当前的方法使用预定义的通用损失函数。他们成功地量化了组织中占主导地位的细胞,而在检测小细胞群体时常常不尽人意。在这项研究中,我们使用训练数据来学习损失函数



    连同组成
    C
    。这使我们能够适应特定于应用程序的要求,例如专注于小细胞群体或区分表型相似的细胞群体。我们的方法与现有方法一样准确地定量了大细胞部分,并显着改善了小细胞群体的检测和相似细胞类型的区分。
  • 【门诊卒中视频游戏康复(VIGoROUS):一项针对在家中游戏化约束诱发的运动疗法进行慢性上肢偏瘫康复的多中心比较有效性试验的协议。】 复制标题 收藏 收藏
    DOI:10.1186/s12883-017-0888-0 复制DOI
    作者列表:Gauthier LV,Kane C,Borstad A,Strahl N,Uswatte G,Taub E,Morris D,Hall A,Arakelian M,Mark V
    BACKGROUND & AIMS: BACKGROUND:Constraint-Induced Movement therapy (CI therapy) is shown to reduce disability, increase use of the more affected arm/hand, and promote brain plasticity for individuals with upper extremity hemiparesis post-stroke. Randomized controlled trials consistently demonstrate that CI therapy is superior to other rehabilitation paradigms, yet it is available to only a small minority of the estimated 1.2 million chronic stroke survivors with upper extremity disability. The current study aims to establish the comparative effectiveness of a novel, patient-centered approach to rehabilitation utilizing newly developed, inexpensive, and commercially available gaming technology to disseminate CI therapy to underserved individuals. Video game delivery of CI therapy will be compared against traditional clinic-based CI therapy and standard upper extremity rehabilitation. Additionally, individual factors that differentially influence response to one treatment versus another will be examined. METHODS:This protocol outlines a multi-site, randomized controlled trial with parallel group design. Two hundred twenty four adults with chronic hemiparesis post-stroke will be recruited at four sites. Participants are randomized to one of four study groups: (1) traditional clinic-based CI therapy, (2) therapist-as-consultant video game CI therapy, (3) therapist-as-consultant video game CI therapy with additional therapist contact via telerehabilitation/video consultation, and (4) standard upper extremity rehabilitation. After 6-month follow-up, individuals assigned to the standard upper extremity rehabilitation condition crossover to stand-alone video game CI therapy preceded by a therapist consultation. All interventions are delivered over a period of three weeks. Primary outcome measures include motor improvement as measured by the Wolf Motor Function Test (WMFT), quality of arm use for daily activities as measured by Motor Activity Log (MAL), and quality of life as measured by the Quality of Life in Neurological Disorders (NeuroQOL). DISCUSSION:This multi-site RCT is designed to determine comparative effectiveness of in-home technology-based delivery of CI therapy versus standard upper extremity rehabilitation and in-clinic CI therapy. The study design also enables evaluation of the effect of therapist contact time on treatment outcomes within a therapist-as-consultant model of gaming and technology-based rehabilitation. TRIAL REGISTRATION:Clinicaltrials.gov, NCT02631850 .
    背景与目标: 背景:约束诱导运动疗法(CI疗法)被证明可以减少残疾,增加受影响的手臂/手的使用,并促进卒中后上肢偏瘫的患者的大脑可塑性。随机对照试验始终证明,CI疗法优于其他康复范例,但只有大约120万患有上肢残疾的慢性卒中幸存者中的一小部分可以使用CI疗法。当前的研究旨在建立一种以患者为中心的新型康复方法的相对有效性,该方法利用新开发的,廉价的和可商购的游戏技术将CI疗法传播给服务欠缺的个人。 CI疗法的视频游戏交付将与传统的基于临床的CI疗法和标准的上肢康复进行比较。另外,将检查对一种治疗方法与另一种治疗方法有不同影响的个体因素。
    方法:本方案概述了采用平行分组设计的多站点随机对照试验。将在四个地点招募24名患有中风后慢性偏瘫的成年人。参与者被随机分为四个研究组之一:(1)传统的基于临床的CI治疗;(2)作为治疗师的顾问视频游戏CI疗法;(3)作为治疗师的顾问视频游戏CI疗法,并通过其他治疗师联系远程康复/视频咨询,以及(4)标准的上肢康复。经过6个月的随访,分配给标准上肢康复条件的患者转入独立的视频游戏CI治疗,然后进行治疗师咨询。所有干预措施均在三个星期内完成。主要结局指标包括通过沃尔夫运动功能测试(WMFT)进行的运动改善,通过运动活动日志(MAL)进行的日常活动的手臂使用质量以及通过神经系统疾病的生活质量进行的生活质量评估( NeuroQOL)。
    讨论:该多站点RCT旨在确定基于家庭技术的CI疗法与标准上肢康复和诊所CI疗法的比较效果。该研究设计还可以在以博弈和技术为基础的康复治疗师-顾问模型中评估治疗师接触时间对治疗结果的影响。
    试用注册:Clinicaltrials.gov,NCT02631850。
  • 【十二指肠类癌的带状结扎切除术(带视频)。】 复制标题 收藏 收藏
    DOI:10.1016/j.gie.2007.01.029 复制DOI
    作者列表:Gomez V,Groce JR,Xaio SY,Bhutani MS,Raju GS
    BACKGROUND & AIMS: -2
    背景与目标: -2

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