Koch MA, Zurad EG. Esophagogastroduodenoscopy. In: Fowler GC, ed. Pfenninger & Fowler's Procedures for Primary Care. 4th ed. Philadelphia, PA: Elsevier; 2020:chap 91.

Positivemeniscuslens

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These F-theta lenses by Avantier are designed for consistent spot size and uniform field curvature correction, ideal for high-resolution imaging applications.

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Esophagogastroduodenoscopy (EGD) is a test to examine the lining of the esophagus, stomach, and first part of the small intestine (the duodenum).

You may feel gas and the movement of the scope in your abdomen. You will not be able to feel the biopsy. Because of sedation, you may not feel any discomfort and have no memory of the test.

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You will not be able to eat anything for 6 to 12 hours before the test. Follow instructions about stopping aspirin and other blood-thinning medicines before the test.

Meniscuslens uses

Positive lenses are used in applications that require small focal number, which is less than 2.5. For focal numbers ranging between 2.5 and 10, meniscus lens can minimize spot size and enhance image quality. The concave side of the positive lens has a smaller curvature, and the convex side has a greater curvature.

It is thicker at the center than at the edges. The lens provides a smaller beam diameter in order to reduce the beam waste and spherical aberration. When a meniscus lens is combined with another lens, the focal length is shortened and the numerical aperture of the system is increased. This reduces the image distortion and increases image resolution.

Sugumar A, Vargo JJ. Preparation for and complications of gastrointestinal endoscopy. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 11th ed. Philadelphia, PA: Elsevier; 2021:chap 42.

Negativemeniscuslens uses

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After the test is finished, you will not be able to have food and liquid until your gag reflex returns (so you do not choke).

EGD is done in a hospital or outpatient center by a specially trained doctor called a gastroenterologist. The procedure uses an endoscope. This is a flexible tube with a light and camera at the end.

Updated by: Michael M. Phillips, MD, Emeritus Professor of Medicine, The George Washington University School of Medicine, Washington, DC. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

There is a small chance of a hole (perforation) in the stomach, duodenum, or esophagus from the scope moving through these areas. There is also a small risk of bleeding at the biopsy site.

Negativemeniscuslens

What Is an Electron Microscope (EM) and How Does It Work? · TEM: magnifies 50 to ~50 million times; the specimen appears flat · SEM: magnifies 5 to ~ 500,000 ...

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Reuven Silverman of Ophir discusses the critical role of M2 measurements in laser technology for optimization and quality control in various industries.

LIS Technologies is on the road to transforming nuclear fuel enrichment through advanced laser techniques, ensuring a sustainable and cost-effective approach to energy production.

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Positivemeniscuslens uses

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The magnification is M = -xi/xo. If M is negative, the image is inverted. We can find the position and size of the image geometrically. Only two rays must be ...

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The VINCI series of ultrafast fiber lasers has a central emission wavelength of 1064 nm and features a unique combination of short pulse durations.

Negative meniscus lenses are used for applications using infrared materials with high refractive index. These lenses are used as an alternative to other negative lenses with a greater curvature on the concave side and a smaller curvature on the convex side. They are used in beam expanding applications that require minimal spherical aberration.

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The esophagus, stomach, and duodenum should be smooth and of normal color. There should be no bleeding, growths, ulcers, or inflammation.