![]() The reason was often the use of X-ray optic, which focus X-ray radiation in a way similar to optical lenses focusing light-but they also have several limitations. Approaches suitable for the typical laboratory still had to struggle with low resolutions, and were limited to certain materials and could not exceed a certain size. High-resolution images of this magnitude require radiation from particle accelerators, yet there are only a few dozen such facilities in Europe. However, the technology reached its limits when it came to objects as small as the tiny, 0.4 millimeter long legs of the velvet worm (Onychophora). Three-dimensional images of the inside of the object are constructed based on several such measurements. During a CT analysis, the object under investigation is X-rayed and a detector measures the respective amount of radiation absorbed from various angles.
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