Scott Bagwell, current PhD student, creating bespoke computational tool

Scott BagwellScott Bagwell is a current PhD student supervised by Dr Paul Ledger and Dr Antonio J. Gil.

Abstract:

MRI scanners have become increasingly popular for use in medical diagnosis. Their high resolution and non-intrusive imaging capability make them ideal for this purpose. They essentially consist of a set of main magnetic coils, which gives rise to a static magnetic field, contained within a cryostat.

A set of metallic radiation shields surround the cryostat. The scanners generate pulsed field gradients, utilised to produce images, through resistive coils contained within the imaging bore.

Despite active shielding the time varying gradient field generates Lorentz forces in the metallic components of the bore tube, which can cause deformations and vibrations in the mechanical parts of the scanner. These phenomena can cause unwanted effects such as image distortion and patient discomfort.

Through an EPSRC funded PhD case award, in partnership with Siemens Magnet Technology, a bespoke computational tool, based on hp-finite elements, is being developed to simulate these effects.

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Pulsed magnetic field gradients generated by the resistive coils in an MRI scanner.

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Electric field arising in the resistive coils of an MRI scanner and the surrounding air.

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Interaction between the bore tube of the scanner and the time varying magnetic field through the generation of mechanical stresses.

Tanmoy Mukhopadhyay, from India, PhD Aerospace Engineering

Tanmoy Mukhopadhyay

“Two major reasons motivated me to join Swansea University for a PhD in Aerospace Engineering after completing my Masters from one of the India's most prestigious institutes.

Firstly, I got the opportunity to work in a research centre that is famous world-wide in the field of Computational Mechanics and moreover, I was offered to work with advisors who are top-notch researchers in this field of research.

The everyday culture here makes me love this University even more. As a research student, I enjoy complete freedom and flexibility in terms of research direction and working hours. I am always encouraged to take up researchers that are not directly related to my PhD works in the sideline. This has helped me to broaden the horizon of knowledge in different research areas of my interest except the PhD topic.

I would love to remain firmly involved with research and development after completing PhD. I believe an academic position will serve well to pursue my passion for invention.”