Relatively soon after the discovery of the X-ray by Wilhelm Conrad Röntgen in 1896, the negative effect of secondary radiation became obvious. Even if the appearance of scattered radiation at that time could not be explained, several trials were made in order to neutralize the effect.
In Berlin in 1913, Gustav Bucky demonstrated the first scatter radiation grid , consisting of lead strips.
Our tradition in grid manufacturing started in 1922, when grids were made in a small workshop in Stockholm, Sweden. In 1926 Dr. Erik Lysholm at the Karolinska Hospital in Stockholm developed a grid with a higher number of lead strips than was commonly used at the time.
In the 1930’s, Lysholm grids were further improved by the Swedish scientist Dr. Sven Ledin, at the Royal Institute of Technology in Stockholm, using a method of bonding aluminum to lead and subsequently milling the surface.
This method led to a completely symmetrical, rigid and uniform grid, all properties that have become well known characteristics of the Lysholm grids.
Although the basic principles are still in use today, production techniques have been continuously improved with Lysholm grids being at the forefront of grid technology.
With more than 60 years of experience of manufacturing and of supplying the worlds health services and x-ray manufacturers with grids, the Lysholm grid has established a well-known reputation for quality and reliability.
Lysholm grids are manufactured in a wide range of specifications such as line density, focal distance, ratio and size.
Grids can be made to order in almost any type and size and designed to meet the requirements of any kind of x-ray equipment. Recently a grid, with 85 line pairs / mm (215lines / inch) and ratios from 2:1 up to 16:1, was introduced that is especially suitable for counteracting image moiré pattern.
A problem common to digital radiography imaging when gratings, screens or regularly spaced patterns are superimposed on one another.