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Modern scanners parallelize this task by using a fan-shaped beam of x-rays and hundreds of simultaneous detectors to scan someone in about a minute, but the first generation of scanners could take several minutes per slice, meaning a scan with even tens of slices could take an hour or more.Designing an almost entirely laser-cuttable CT scanner with four axes of motion, one being a large rotary gantry, was a lot of fun and an interesting design challenge.
Mechanically, this prototype scanner is very similar to the first generation of CT scanners.
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To scan an object, the table moves the object to the slice of interest, the gantry rotates to a given angle, then scans the source and detector across the object to produce a 1D x-ray image.
The gantry then rotates to another angle, and the process repeats, generating another 1D image from a slightly different angle.