Thanks to my colleague Jerry Battista from the University of Western Ontario, understanding the basic MR pulse sequence (a not so obvious topic especially if you have to design such a sequence) is now easier than ever. For those who do not know Prof. Battista also developed a mini-CT scanner (using non-ionizing radiation!) to teaching the basic of medical imaging from high-school all the way to university. We are using this scanner in our undergraduate laboratory.
So, check out this wonderful and accessible teaching YouTube Video: Understanding an MRI Pulse Sequence using a Guitar.