医用硬管内窥镜光学性能检测系统设计

发布时间：2018-11-13 16:47

【摘要】：医用硬管内窥镜,是一种医用光学观察仪器,它可以插入人体体腔和脏器内进行直接观察、诊断和治疗。医用硬管内窥镜具有图像清晰度高、色彩逼真等优点,作为辅助医疗器材,目前被广泛应用于无创或微创诊疗或手术中。现行的内窥镜光学性能检测标准有两个国际标准、和国家标准,但是这两种均有一些不足之处,不适合内窥镜生产厂家和医疗机构使用。本文的主要目的是通过设计新的内窥镜检测系统及检测方法,推进内窥镜检测的标准化和推广使用。本文设计完成了一套内窥镜光学性能检测系统,采用机器视觉原理检测硬管内窥镜的光学性能,代替人眼判断,智能化程度高,精度高,重复性好。本文重点就硬管内窥镜光学系统的调制传递函数MTF、光效均匀性和屈光度光学参数的检测进行了以下的研究:1、合理设计使用新的检测方法和检测装置,搭建检测平台;2、选择软件平台,对不同参数,进行软件方面的编写,调试;3、对不同的光学参数,进行了多人,多次的重复性检测,验证了检测系统参数检测结果的重复性。同时进行了对比试验,与现有国家标准的测量结果进行对比,检验了其准确性。本文所提出的检测系统有以下几个方面的优势:1、检测装置方面,本文利用LCD显示代替传统靶标,解决了传统靶标加工和更换困难的问题;利用电控平台作为检测系统位移调节装置,提高了检测结果的重复性和精确性;2、软件方面,本文利用机器视觉定量的计算、测量和评估硬管内窥镜的光学参数,代替人眼判断,智能化程度高,精度高,重复性好;3、内窥镜性能评价方面,利用MTF代替极限角分辨率评价医用硬管内窥镜成像质量,利用内窥镜整个视场边缘与中心的亮度比曲线代替国标中的90%最大入瞳视场角的边缘光效值,所包含信息更全面,丰富,评价更为准确。
[Abstract]:Medical hard tube endoscope is a kind of medical optical observation instrument. It can be inserted into human body cavity and viscera for direct observation, diagnosis and treatment. Medical hard tube endoscope has many advantages such as high definition of image, realistic color and so on. As an auxiliary medical device, it is widely used in noninvasive or minimally invasive diagnosis and treatment or surgery. There are two international standards and national standards for the optical performance testing of endoscope, but these two standards have some shortcomings and are not suitable for the use of endoscope manufacturers and medical institutions. The main purpose of this paper is to promote the standardization and application of endoscope detection by designing new endoscope detection system and testing method. In this paper, a set of optical performance testing system for endoscope is designed and completed. The principle of machine vision is used to test the optical performance of hard tube endoscope, which replaces human eye judgment, and has high intelligence, high precision and good repeatability. In this paper, the modulation transfer function (MTF,) of hard tube endoscope optical system is studied as follows: 1. Reasonable design and use of new detection method and detection device; 2. The software platform is chosen to compile and debug the software for different parameters. 3. For the different optical parameters, repeated and repeated tests are carried out to verify the repeatability of the testing results. At the same time, a comparative test was carried out, and the accuracy was verified by comparing the measurement results with the existing national standards. The detection system put forward in this paper has the following advantages: 1. In the aspect of detecting device, this paper uses LCD display instead of traditional target to solve the problem of difficult processing and replacement of traditional target; Using the electronic control platform as the displacement adjusting device of the detection system, the repeatability and accuracy of the test results are improved. 2. In software, this paper uses machine vision to calculate, measure and evaluate the optical parameters of hard tube endoscope instead of human eyes, which has the advantages of high intelligence, high precision and good repeatability. 3. In the aspect of endoscope performance evaluation, MTF is used instead of limit angle resolution to evaluate the imaging quality of medical rigid tube endoscope. By using the luminance ratio curve of the whole field of view to the center of the endoscope to replace the 90% of the maximum entrance field of view angle in the national standard, the information is more comprehensive, abundant and the evaluation is more accurate.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH776.1

【相似文献】