Computer aided diagnosis is a topic that has been progressing really fast, make sure the references are very recent please. The main area revolves around image analysis using artificial inteligence techniques such as machine learning and more specifically deep learning. (Aplied to CT, MR, x-ray, Mamography, and other)You should be familiar with sensitivity, specificity and Roc curve to understand the performace of theese systems. I atached a paper that seems usefull. Good luck! And please be carefull as I need this essay to enter a really good university.