Inter-scanner and inter-patient variability for large-scale MRI studies

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MRI is used across the NHS and other health services in the diagnosis and monitoring of every major disease including Cancer, Heart Disease, Dementia, and Stroke (the four largest killers in the UK). Clinical MRI data, however, is typically qualitative. This leads to considerable variability in images acquired on different scanners and between different points in time which is not due to the underlying pathology. This means that important biological variability or the effect of a new therapy is obscured by differences between scanners - a major confound for drug trials and AI-based inference. Inter-scanner variability greatly increases the amount of data required, increasing study costs and complexity and in some cases needlessly eliminating promising approaches and therapies altogether.This project aims to separate inter-scanner variability from inter-patient variability, characterising the effect of each using large databases of MRI images and QA data from UCL and Alliance Medical. We will perform process control analysis to establish time-dependent calibration for the images and use this to correct for the effects of scanner variability. We will then perform advanced clustering and variability analysis on the images to identify the remaining drivers of change in the patient population. This provides baselining of a large cohort of healthy individuals which can be used to underpin further work in standardising the pipeline of comparison between control and patient images.