tailieunhanh - Practical Pediatric Gastrointestinal Endoscopy - part 3

Có một lợi thế lý thuyết bởi vì mỗi điểm ảnh có duy nhất, trực tiếp đo, thông tin đầy đủ màu sắc. Rất lý tưởng cho nghiên cứu dựa trên các thuật toán phân tích quang phổ và màu sắc. Chiếu sáng hoạt nghiệm tạo ra các vấn đề với chuyển động nhanh chóng. | 36 CHAPTER 3 Feature RGB sequential video endoscopes Color-chip video endoscopes Image resolution Have a theoretical advantage because each pixel has unique image intensity information. The advantage is primarily seen only in the very smallest of endoscopes. Have a slight disadvantage because information from multiple pixels must be combined together. Color accuracy Have a theoretical advantage because each pixel has unique directly measured full-color information. Ideal for research based on spectroscopy and color-analysis algorithms. Have a slight disadvantage because color is calculated from values of surrounding pixels. Reproduction of motion Stroboscopic illumination creates problems with rapid motion. Motion produces color slip and brightly colored artifacts. Newer generation systems have advanced image capture algorithms to reduce the color-slip problem. Smooth natural reproduction of motion. No stroboscopic effect. No color artifacts. A fast shutter mode reduces blurring of quickly moving subjects. Abdominal transillumination Strobed illumination produces very weak transillumination. Transillumination Mode results in good transillumination but normal imaging is impossible. The system s bright continuous white light illumination is ideal for transillumination. Light source compatibility Requires a special strobing light source. Videoscopes are compatible with light sources for fiberoptic endoscopes. Compatibility with laser therapy The red He-Ne aiming beam appears white and may mask the tissue-blanching effect. Built-in filters enable the endoscope to be used with Nd YAG lasers. Built-in filters enable the endoscope to be used with Nd YAG lasers. Table The advantages and disadvantages of the two basic endoscope imaging systems. precautions ii Occupational Safety and Health Administration rules on exposure to blood-borne pathogens iii procedures for the safe handling of chemicals iv professional society guidelines . those promulgated by ASGE SGNA APIC