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.