X-ray camera provides more detailed images for dentists

The camera is claimed to take X-ray pictures that are more detailed and with a higher contrast than the conventional X-ray machines widely used by dentists today.

The camera itself was designed by the Scint-X company, while the key element of it - a scintillator device that converts X-rays to visible light that can then easily be detected by an inexpensive CCD imager - was built by another Swedish outfit, Nanospace.

The new scintillator design overcomes a major issue encountered with conventional unstructured scintillator plates. While the visible light created through X-ray absorption spreads on its way through the crystal in such plates, the new scintillator concept channels the light on its way to the CCD camera instead.

To build the new scintillator, narrow channels were etched into silicon to make a matrix that is then filled with a Thallium-doped Cesium Iodide scintillator material. When X-rays enter those channels, they are converted into green light, which is then reflected by the channel sidewalls so that it does not leave the channel. Thus, the spreading of light that would lead to crosstalk between neighbouring pixels on the CCD imaging chip is avoided.