What is the usual range of the diagnostic x-ray tube anode angles?

• A. 12-20 degrees
• B. 30-45 degrees
• C. 2-10 degrees
• D. 15-30 degrees

Answer: (A)

Anode angle determines how the target surface is tilted relative to the electron beam and directly influences image sharpness and heat handling. In diagnostic X-ray tubes, a moderate tilt is used: about twelve to twenty degrees. This range provides a small effective focal spot, which helps produce sharper images, while still offering enough actual anode surface area to diffuse the heat generated during exposure. Angles that are too small increase geometric blur and heel effect, compromising sharpness and heat distribution; angles that are too large reduce some practical benefits and can introduce other design and cooling constraints. The twelve-to-twenty degree range is the typical compromise used in most diagnostic tubes, which is why it’s considered the usual range.