Although Sue's brain did not become fossilized, the braincase surrounding it is remarkably well preserved. According to the CT scans, Sue’s brain was about a foot long and was shaped like a knobby sweet potato or a head of broccoli. By studying CT scans of the inside of this structure, researchers at The Field Museum have been able to map out many areas of the brain. CT scanning uses powerful x-rays to create highly detailed images of an object - both inside and out.

In August of 1998 Sue's skull traveled to California, where it spent 500 hours inside one of the world's most powerful CT scanners. Owned by the Boeing Company, it's used as a tool for finding hidden flaws in jet engines and space shuttle parts.

Reference: Information from The Field Museum website.