Assessment of tardive dyskinesia by means of digital image processing

A wireless device for the assessment of tardive dyskinesia by means of digital image processing is presented. Four skin-cream dots placed around the subjects' mouth are recorded by a video camera. The image is passed to a framegrabber with a signal processor, where it is converted from analogue to digital. A fast spot-detecting algorithm implemented on the signal processor tracks the dots and passes the information to a personal computer, where a Fourier transformation is performed to calculate the frequency spectrum of the movements. The device provided detailed information on the magnitude and on the frequencies of the movements. Data from a longitudinal investigation suggest a higher sensitivity and reliability than conventional rating scales to detect and evaluate abnormal perioral movements. The device might be useful for the early detection, for the longitudinal assessment (p.e. clinical trials) and in some cases for the differential diagnosis of tardive dyskinesia, thus providing a tool for both research and clinical purposes.     

数字化曲面全景X线系统造影在腮腺非肿瘤类疾病诊断中的应用

目的　本文报告普通X线机腮腺造影与数字化曲面X线机腮腺造影结果及其对比应用。方法　用3种不同的X线机对 3组腮腺非肿瘤类疾病患者进行腮腺造影 ,第 1组患者 10人应用普通 30 0mAX线机 ,第 2组患者 10人应用普通曲面全景X线机 ,第 3组患者 36人应用数字化曲面全景X线系统一套 ,分别行造影检查。结果腮腺造影侧位投照第 2组与第 1组末梢导管及腺泡有显著差异 (P <0 .0 5 ) ,第 3组与第 1组末梢导管及腺泡无显著差异 (P >0 .0 5 ) ,腮腺造影后前位投照第 2组与第 1、3组之间有显著差异 (P <0 .0 5 )。结论　本研究对比了 3种X线投照技术在腮腺非肿瘤性疾病造影诊断中的效果 ,用数字化曲面全景X线系统造影在诊断此类疾病中显示出较好的效果。     

动脉数字减影血管造影的临床应用

本文报告８０例动脉数字减影血管造影（ＩＡＤＳＡ）的初步经验，特别着重影像质量的评价。在本组病例，ＩＡＤＳＡ主要用于头颅、颈部、肺、腹部以及先天性心脏病的诊断。本组未发生重大并发症。ＩＡＤＳＡ的优点是：（１）影像质量好；（２）用于ＩＡＤＳＡ的剂量和浓度以及导管的直径均较用于常规血管造影的小得多，因此其副作用和并发症显著减少；（３）检查时间显著缩短，因此，ＩＡＤＳＡ对介入放射学治疗特别有用；（４）ＩＡＤＳＡ现已大部取代常规血管造影来诊断多种疾病。     

数字减影在经内镜胆管内取石术中的应用（附30例分析）

数字减影具有分辨率高、实时成像的特点，为经内镜胆管内结石顺利操作提供了方便。本文总结３０例用数字减影胆管内取石，认为术前病人应充分肠道准备，合理使用平滑肌松弛剂，术中多角度观察，ＥＲＣＰ复查，可望明显提高手术成功率。     

Digital subtraction arthrography in preoperative evaluation of painful total hip arthroplasty

 Objective. The objective of this clinical study was to define the diagnostic value of plain radiography, digital subtraction arthrography and two-phase bone scintigraphy in patients with clinically loose or infected hip prostheses. Design. Digital subtraction arthrograms, scintigrams and plain radiographs of 70 consecutive patients who underwent revision hip arthroplasty were scored individually and in masked fashion for the presence or absence of features indicating loosening of femoral and/or acetabular components. The operative findings acted as the gold standard. Results. Digital subtraction arthrography was best (P<0.001) for predicting a loose acetabular component, while no significant additional predictive value was found for plain radiographs (P=0.24) and scintigraphy (P=0.27). Digital subtraction arthrography was also the most important modality for predicting a loose femoral component (P=0.001), while the plain radiograph was of significant (P=0.04) additional value and scintigraphy was of no additional value (P=0.13) on multivariate analysis. Conclusion. Digital subtraction arthrography gives the best results in the prediction of loosening of acetabular and femoral components. Plain radiographs give additional information on loosening of the femoral component, but scintigraphy offers no additional advantage.     

Determination of left ventricular wall thickness and muscle mass by intravenous digital subtractionangiocardiography: validation of the method

Left ventricular (LV) wall thickness and muscle mass are importantmeasures of LV hypertrophy. In 24 patients LV end-diastolicwall thickness and muscle mass were determined (two observers)by digital subtraction angiocardiography (DSA) and conventionalLV angiocardiography (LVA). Wall thickness was determined overthe anterolateral wall of the left ventricle according to thetechnique of Rackley (method 1) or by planimetry (method 2).Seventeen patients were studied at rest and seven during dynamicexercise. Wall thickness correlated well between LVA and DSA;the best correlations were obtained by a combined subtractionmode using either method 1 or 2 (method 1, r0–80; method2,r0. 75). The standard error of estimate of the mean (SEE) wasslightly lower for method 2 ( 10%) than for method 1 ( 13%).DSA significantly overestimated wall thickness by 5–7%with method 1 and underestimated by 12–14% with method2. Muscle mass correlated well between LVA and DSA; the SEEwas 15% for method 1 and 12% for method 2. Overestimation ofmuscle mass by DSA was 7–11% with method 1 and underestimationwas 13–15% with method 2.It is concluded that LV wallthickness can be determined accurately by DSA with an SEE rangingbetween 10 and 13%. Determination of LV muscle mass is slightlyless accurate and the SEE is slightly larger ranging between13 to 17%. With method 1, wall thickness and muscle mass wereover estimated and with method 2 underestimated.     

基于移动终端的《口腔组织病理学》图谱小程序的开发与评价

目的 探究基于小程序的辅助式教学在口腔医学教学中的应用效果及相关改进与发展建议。方法 通过数字化技术构建包含图例、组织学切片、示意图、知识点手绘图片等在内的内容涵盖广、专业性强的《口腔组织病理学》图谱小程序。利用其依托于微信平台的优势,建设了中英双语标注、师生实时互动交流等功能。选取30名口腔医学生作为研究对象,在其使用图谱小程序前后进行测试,将两次学习成绩使用SPSS 22.0软件进行t检验分析。同时让45名学生使用为期1个月的图谱小程序后对其进行问卷调查,内容包括使用电子图谱的态度,学习过程中使用图谱小程序的满意度与意见,对未来师生共同使用图谱小程序的意见等。结果 在使用图谱小程序辅助学习后,学生的测试成绩各项显著提高。其中,试验组填空题[（17.00±2.61）分 vs. （15.03±1.85）分]、识图题[（27.93±5.08）分 vs. （25.13±3.31）分]与总分[（78.77±8.59）分 vs. （72.90±6.08）分]与对照组相比,差异有统计学意义（P<0.05）。问卷调查结果显示,学生对于《口腔组织病理学》图谱小程序辅助教学的满意度高、对师生互动功能的认可度高,使用小程序的整体效果好。结论 图谱作为《口腔组织病理学》重要的教学辅助工具之一,在呈现组织结构的直观性与真实性等方面对口腔医学生的理论学习有重要作用。将图谱与电子媒介结合,尤其是利用便携的移动设备,无疑更有益于学生对知识点的掌握。     

通过凝胶电泳数字化图像分析蛋白含量的改进方法

本文提出利用凝胶电泳数字化图像技术，通过光密度方法测量蛋白含量的改进方法和修正公式。分析了凝胶电泳图像数字化过程中，照射光源强度、凝胶背景、摄像机等参量对蛋白含量计算结果的影响；并证明了用不同强度的光源照射或使用大小不同的摄像机光圈所获得的凝胶数字化图像，不影响测量结果。采用图像分析技术确定蛋白区带电泳边界和修正公式，测量了不同浓度的牛血清白蛋白、β－乳球蛋白的相对含量，结果显示：修正公式的计算结果与蛋白实际浓度的相关系数高于不考虑凝胶背景的公式的计算结果，且修正公式的计算结果与实际含量更趋近于正比关系     

大脑前动脉的A1优势征及在前交通动脉瘤脑血管造影诊断中的意义

目的：探讨A1优势征的影像学表现及其出现率与大脑前交通动脉瘤的关系.方法：回顾性分析128例脑动脉瘤数字减影脑血管造影的影像学资料.以大脑前交通动脉瘤作为试验组,其他部位的动脉瘤作为对照组.结果：128例病人中,共139个动脉瘤.前交通动脉瘤49个,后交通动脉瘤41个,基底动脉瘤29个,大脑中动脉瘤14个,颈内动脉瘤6个.A1优势征58例,A1对称75例.结论：前交通动脉瘤Al优势征多见,其出现率与其他部位脑动脉瘤之间存在显著差异（P＜0.05）.     

Benefits of the DICOM Modality Performed Procedure Step

A few years ago, the Digital Imaging and Communications in Medicine standard introduced a network transaction that is initiated by modality equipment, mainly at the beginning and at the end of the acquisition. This transaction, the Modality Performed Procedure Step (MPPS), is sent to the Picture Archiving and Communication System and/or to the Radiology Information System. It carries information about what really has been performed by the modality equipment during acquisition. In this paper, we present MPPS and discuss its benefits. We show how MPPS enables efficient radiology workflow and how it ensures accuracy and completeness of imaging information. We think our paper helps bridge the gap between MPPS implementation and deployment. By understanding all the MPPS benefits, the end user becomes aware of the great enhancement in patient care that this transaction provides.