Doctors there performed a CT scan on the right arm of Sue the T-Rex Wednesday.
It's part of a study by the Field Museum to learn how T. Rex's use their famously short arms.
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It's not the first time the UChicago Medicine's radiology team has worked with the Field Museum on CT scans of dinosaur fossils, but Sue is certainly their most famous "patient."
The scans will be used to create digital models showing range of motion and force.