For those who would like a dinosaur's-eye view of CT-scanning a dinosaur... The eight known skull bones of the holotype (name-bearing) specimen of Tyrannosaurus rex (CM 9380) are on loan to WitmerLab at Ohio University for CT scanning and analysis. This video shows Witmer and Heather Rockhold, Radiology Manager at O'Bleness, scanning the right dentary of the T. rex holotype. You can hear Heather and me talking about positioning. We're trying to adjust the position of the fossil within the scan field of view (FOV) so as to minimize the FOV and maximize the information content. You can see the red laser light running along the jaw, showing the center of the FOV. We leave the room, and then the x-rays turn on and the table moves in and out of the scanner's doughnut-shaped gantry to generate a "scout" image that allows us to set up the scan. After the first round (and I've edited out many minutes here and there while Heather and I were in the control room analyzing the scan protocol), we come back in at about 1:40 to adjust the positioning a bit more, so that we can get a small enough FOV that we can use the "bowtie" filter that improves image quality further. We routinely do this repeatedly, moving the specimen just millimeters to optimize the results. Success! T. rex has a biiiig jaw but we were just able to get it to fit! For more content like this, check out our Facebook page ( / witmerlab ) or our university page (www.ohio.edu/w....
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Tyrannosaurus rex holotype - CT scanning at OhioHealth O'Bleness Hospital
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