my aunt is a sonographer and thats how I became interested in this field.
That is not really the best thing to write. Think about what your goal is. When you write, the goal usually is to make the reader do a particular thing... buy your product, visit your web page, give you a good grade, allow you into a program, award you a scholarship... so what do you want this reader to do?
Write the content that will make the reader stop and say, "Oh, this kid really deserves every opportunity, because she planned so carefully and reads so diligently. Show that you are absolutely hell bent on transforming this field and making a big splash in the world of modern medicine.
Do not use lists like this... you have to write from a state of mind that is totally free, and when you really share something that reflects a free state of mind, the reader can really feel it.