Katy Ordidge demystifies the physics of MRI

Behind the Scences at Cheltenham is a daily blog from the UCL CABI team at Cheltenham Science Festival. Every day a member of the team will be talking about their experiences of running a stand.

Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6 |

Two hours into my first shift at Cheltenham and I’d already made one child cry. Not quite the start I’d anticipated.

My colleagues and I from the Centre for Advanced Biomedical Imaging (CABI for short) are at the Cheltenham Science Festival to demonstrate how magnetic resonance imaging (MRI) scanners work and why they are important.

Our “MRI: Can You Scan It?” stand is pitched in the centre of the Discover Zone inside the grand Cheltenham Town Hall. The main draw is a tabletop – in the loosest sense of the word – 1 Tesla Bruker MRI scanner which people can feed with fruit and other small objects to produce live images. Accompanying this are a couple of presentations explaining how MRI works and how it can be applied to imaging your brain.

I was in charge of talking through the latter slideshow and explaining the basics of fMRI: functional magnetic resonance imaging. You’ve probably seen fMRI images in the papers: regions of the brain ‘light up’ in response to a stimulus such as touch, smell or sight. The waterworks incident occurred when I was demonstrating one region of the brain we can probe, using the video below of a dead snake.

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Dr Mark Lythgoe (UCL Centre for Advanced Biomedical Imaging) took the audience of his Lunch Hour Lecture on 13 March on a journey to explore the greatest brain of the 20th century. The lecture to mark Brain Awareness Week drew in a large crowd; potentially explained by the promise of seeing a real brain!

The journey began with a video clip of Dr Lythgoe and Dr Jim Al-Khalili from the programme The Riddle of Einstein’s Brain (Channel 4, National Geographic USA, 2005). The two presenters were getting into a red convertible in southern California and setting off in search of the brain of Albert Einstein.

The presenters could not agree, however, on where genius originates from and consequently where it can be found. Is genius determined by biology and therefore can Einstein’s brain show us how? Or is genius a culturally dependent term that lives in the ideas produced?

Dr Lythgoe threw the question to the audience: “Did Einstein need to have published his work to be considered a genius? Or if he had done exactly the same amount of work and drawn the same conclusions, but never published, would he still be a genius?”

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