I can second the opinion that the medical instrumentation field is a promising direction for brand new career seekers. Having spent over thirty years in the medical instrumentation field dealing with hundreds of different devices I still find it fascinating and challenging. Make no mistake, this is a huge and varied field where none of us can know everything. You may work on amplifiers where the input is only tens of micro Volts or X-ray machines where the 100KV is not uncommon. Of course everywhere are computers, software and microchips. You’d better also know IT networking, at least on a casual level. Medical physics and medical imaging are advanced fields that stand on their own.
Some knowledge of anatomy and biology is also a must. Presently in the US at least it is hard to recruit knowledgeable new job candidates.
Here is a link to the AAMI which is one of the professional associations dealing with medical instrumentation, new happenings, standards, jobs etc.
http://www.aami.org/