Geometric magnification is the ratio of the actual size of the sample to the size of the X-ray image projected on the X-ray camera. This value is the ratio of the distance from the X-ray focal point to the object (FOD) to the distance from the X-ray focal point to the camera (FID).
For example, if an object is placed 100 mm away from the X-ray focus and a camera is placed 400 mm away from it, geometric magnification = FID/FOD = (100+400)/ 100 = 5 [times].
Placing the camera farther away increases the geometric magnification, but reduces the amount of X-rays incident on the camera. To increase the geometric magnification, shorten the FOD (move the object as close to the X-ray tube as possible) to obtain a large geometric magnification.
Information on related articles in Technical Knowledge
- What are X-rays? (Basic Knowledge)
- The Right Way to Choose appropriate X-ray Inspection System
- Non-Destructive Testing: Types and Applications
- How to Take Beautiful X-ray CT Images? - X-ray Non-Destructive Inspection series (1) -
- How to View X-ray CT Images - X-ray Non-Destructive Inspection series (2) -
- X-ray Image Processing and Automated Inspection - X-ray Non-Destructive Inspection series (3) -
- Types of X-ray tubes and high-voltage power supplies
- Principles of Radiography
- How to use X-ray Inspection System safely
- What is Microfocus X-ray? (Basic Knowledge)
- Radiation Effects on the Human body and the safety of X-ray equipment
- What is the difference between Radioactivity, Radiation, and Radioactive Materials?