Pixel Matrix with 18 x 160 pixel cells. For comparison a part of a match is shown.
The innermost layers of the ATLAS experiment will be composed of silicon pixel detectors. Close to 100 million individually amplified detector cells are able to determine and trace the exact position of the charged particles produced in a proton-proton collision. The same type of pixel detector can be used for biomedical imaging when a high spatial resolution is needed, for instance in mammography. The detector simply counts the absorbed X-ray quanta individually, via tiny counters implemented in every pixel. The method gives a truly digital image of the absorbed X-ray dose. The radiograph is visible in real time, eliminating the use of a film. Hence, a relatively small modification of the ATLAS pixel detector has led to digital radiography.
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