According to image system OEM’s, “Image is everything”, or “Seeing is believing”. A list of great specifications is not as important as the end results. There are several recognized standards for measuring focal spot size, each of which deviate significantly. Some X-ray tube manufactures specify a small spot, yet the image can be blurry due to oblong or double (dog bone) focal spots. We produce X-ray tubes with small, round focal spots, minimizing un-sharpness, for clearer images.

The current standards for focal spot measurement (EN 12543 and ASTM E 1165, IEC 60336:) describe different measurement methods, which do not provide identical values. Sufficient image quality depends on the inherent detector unsharpness and the geometric unsharpness. The geometric unsharpness is determined by the focal spot intensity distribution and the magnification used.

Therefore, the shape of the focal spot cannot be neglected, even if the shape distribution is not required by any standard practice.

Why we are better:
Consequently, we don’t rely on focal spot standards to establish image quality – we let the image quality speak for it-self.

Related Products:

Micro Focus X-Ray Tube - Micro X-Ray

With focal spot as small as 5 microns, these tubes are perfectly suited for small feature imaging applications.

Mini focus glass X-ray tube line from Micro X-Ray in Santa Cruz, California

Mini Focus Glass X-Ray Tube
Available in a variety of target materials and performance configurations, including small focal spot, high stability and wide beam angles to suit all of your imaging needs.

Mini Focus Packaged X-Ray Tubes
These x-ray tubes have bronze packaging that provides both isolation and excellent thermal properties that enable continuous operation without compromise.


We are always happy to help or advise on your specific x-ray requirements—from general to technical questions we are happy to help.

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