基于虚拟仪器技术的高频电刀波峰因子检测与验证

提出了一种有效易行的高频电刀波峰因子检测系统的软、硬件设计方案。利用电磁感应原理接收电刀输出波形,由普通的数字示波器完成数据采集与数字化,基于虚拟仪器技术的PC端软件根据数据计算波峰因子。通过对高频电刀波峰因子的检测,最终验证波峰因子对电刀性能以及临床使用效果的重要性。     

视场角设置对虚拟环境中目标判断的影响

目的探讨不同视场角参数对虚拟环境中目标判断的影响规律 ,找出最佳视场角参数。方法利用自行研制基于PC平台的虚拟现实 (VR)实验系统 ,选定 45名年龄在 2 3～ 5 8岁被试者并完成大小与角度判断的实验设计。首先进行 30 0人次的预实验 ,确定引起虚拟环境中目标判断差错的视场角及相应观察任务的差别等级 ,然后开始单因素、4水平的完全随机正式实验。结果方差分析表明 ,不同的虚拟环境视场角对目标判断的真实性有显著性影响 ,当视场角为 60°时 ,目标判断的正确率最大。结论利用VR技术进行载人航天器工效设计、操作训练或其它任务的研究时 ,应考虑视场角的作用 ,适合目标大小判断的视场角参数值宜取 60°,以便获得最大的工效     

Three‐Dimensional Reconstruction of the Optic Canal‐Based on Multislice Helical CT: A Comparison Analysis with Skull Dissection of 40 Postmortem Cases

Decompression operation of the optic canal via the nasal path under endoscope is widely used, but it is both a challenging and controversial method. Unsatisfactory results were largely associated with otolaryngologists' limited understanding of the real anatomical situations of the optic canal before operation. To provide otolaryngologists with the real situations and data preoperation, multislice helical CT was used to reconstruct the images of the optic canal. Using multislice helical CT‐aided three‐dimensional reconstructive methods in combination with direct anatomic measurement, we dissected and analyzed the shape of the optic canal and its anatomic relationship with the adjoining structures in 40 intact postmortem skull samples. The In‐Space technique clearly showed the structure and the related region of the optic canal. The virtual endoscopy technique showed superbly the spatial appearance and topography of the inner optic canal and also gave the inner structure of the optic canal optically. There was no statistic difference in three‐dimensional reconstructive data with that obtained by anatomical measurements and thus can be used to directly instruct the clinic operation. These results demonstrate that a combined In‐Space technique with virtual endoscopy can accurately define the subtle structure and the related region of the optical canal. In conclusion, multislice helical CT‐based three‐dimensional reconstruction is of important value for clinical operations. Anat Rec, 2008. © 2008 Wiley‐Liss, Inc.     

"虚拟中国人"建模动脉灌注液浓度的选择

目的 :为“虚拟中国人”建模的动脉灌注液选择适宜浓度。方法 :以明胶、朱砂、淀粉为灌注液 ,分别配制为低浓度组 (按 2 0 %、10 %、10 %比例配制 )、中浓度组 (比例为 3 0 %、10 %、10 % )和高浓度组 (比例为 3 0 %、10 %、2 0 % ) ,通过对大白兔的动脉灌注 ,观察动脉显示的效果。结果 :低浓度组的动脉显示过密 ,腹腔脏器红染 ,影响清晰度 ;中浓度组动脉显示良好 ;高浓度组灌注不顺畅 ,动脉显示不全。结论 :按 3 0 %明胶、10 %朱砂和 10 %淀粉的比例 ,是“虚拟中国人”动脉灌注建模的适宜浓度。     

The Role of Telehealth in Sideline Management of Sports-Related Injuries

The COVID-19 pandemic has affected the ability of the sports medicine physician to be present to participate in in-person sideline evaluation of the injured athlete. The purpose of this review is to assess existing literature regarding the utilization of telehealth for sideline evaluation and management of the injured athlete, as well as to identify further areas of research. With the rapid incorporation of telehealth visits, the utilization and capabilities of telemedicine continue to expand. A number of evidence-based resources are available to support medical providers to develop and utilize video evaluation for the sideline evaluation of sports-related injuries. Future research, including the development of validated, modified examination techniques and technologies, will allow for improved interactive physical examinations, which may be better utilized for sideline evaluation.     

数字信号处理技术在医学物理实验中的应用

信息社会的发展,在很大程度上取决于信息与信号处理技术的先进性.数字信号处理技术的出现改变了信息与信号处理技术的整个面貌,测量仪器技术与计算机技术深层次的结合正引起测试仪器领域里一场新的革命,一种全新的仪器结构概念导致了新一代仪器--虚拟仪器的出现,它是现代计算机技术、通信技术里测量技术相结合的产物,是传统仪器观念的一次巨大变革.它的出现使得人类的测试技术进入了一个新的发展纪元.本文介绍了用"弱电与非电信号处理系统"这一虚拟仪器进行生物非电信号的采集和分析的应用过程.     

基于虚拟气体传感器阵列的新型肺癌检测电子鼻实验研究

本研究介绍了一种新型的基于虚拟气体传感器阵列及图象识别方法的新型无创肺癌检测与诊断电子鼻。该电子鼻包含一个由固相微萃取和毛细管柱组成的前处理装置实现病人呼吸气体中有机气体成分的浓缩吸附、脱附和分离,通过一个表面涂覆聚异丁稀薄膜差动结构的声表面波传感器对分离后的有机气体成分进行定量检测。此外,采用由毛细管柱方法实现的虚拟气体传感器阵列及改进的人工神经网络算法实现对肺癌呼吸气味图像的有效识别。通过临床实验验证,表明该电子鼻仪器可以有效地识别出肺癌患者、肺癌疑似病人和健康人,因此将有望在包括肺癌等疾病的早期诊断仪器中发挥重要的作用。     

Comparison of CT virtual endoscopy with electronic colonoscopy in 30 colonic c arcinoma patients

目的　探讨CT仿真内镜在结肠癌诊治中的临床应用。方法　收集 30例结肠癌的CT仿真内镜、电子结肠镜及手术病理的材料 ,并从肿块分型、病变环周侵犯范围及病变长度等三方面进行比较。结果　结肠癌的CT仿真内镜征象分析 :(1)肿块分型 :肿块型 11例、溃疡型 11例、浸润型 8例。 (2 )环周侵犯范围 :侵犯肠腔≤ 1/2共 4例、侵犯肠腔 1/4- 3/4共 6例、侵犯肠腔≥ 3/4共 2 0例。 (3)病变长度 :1.0 - 3.0cm共 7例 ,3.1- 5 .0cm共 10例 ,5 .1- 1.0cm共 13例。CT仿真内镜、电子结肠镜与手术病理结果对照 :(1)CT仿真内镜与手术病理结果比较 :肿块分型相同 2 6例 ,不同 4例 ;环周侵犯范围相同 2 5例 ,不同 5例 ;病变长度相同 2 3例 ,不同 7例。 (2 )电子结肠镜与手术病理结果比较 :肿块分型相同 2 2例 ,不同 8例 ;环周侵犯范围相同 2 8例 ,不同 2例 ;病变长度相同 14例 ,不同 3例 ,电子结肠镜不能确定病变长度 13例。结论　CT仿真内镜能获得类似电子结肠镜所见的图像 ,可以作为不能进行电子结肠镜检查 ,或电子结肠镜检查观察不全面的结肠癌患者的一种良好补充检查手段。     

Can virtual simulation of breast tangential portals accurately predict lung and heart volumes?

A treatment portal or simulator image has traditionally been used to demonstrate the lung and heart coverage of the breast tangential portal. In many cases, these images were acquired as a planning session on the linear accelerator. The patients were also CT scanned to assess the lung/heart volume and to determine the surgical site depth for the electron‐boost energy. A study using 50 consecutive patients was performed comparing the digitally reconstructed radiograph (DRR) from the virtual simulation with treatment portal images. Modification to the patient's arm position is required when performing the planning CT scans due to the aperture size of the CT scanner. Virtual simulation was used to assess the potential variation of lung and heart measurements. The average difference in lung volume between the DRR and portal image was less than 2 mm, with a range of 0?5 mm. Arm position did not have a sig­nificant impact on field deviation; however, great care was taken to minimize any changes in arm position. The modification of the arm position for CT scanning did not lead to significant variations between the DRRs and portal images. The Advantage Sim software has proven capable of producing good quality DRR images, providing a realistic representation of the lung and heart volume included in the treatment portal.     

基于虚拟仪器技术的脑电生物反馈治疗仪研制

脑电生物反馈治疗在治疗神经疾病中具有一定的应用价值,本文利用虚拟仪器技术设计了一种功能齐全、性能优良的脑电生物反馈系统,提出了系统硬件和软件的实现方案,并研制了该系统的样机,在精神障碍临床治疗过程中取得一定的临床治疗效果。