It depends on whose definition you use with respect to the CIO/CTO role. In my experience, CIOs are typically more focused on the internal IT infrastructure, keeping it secure, running smoothly, etc., (i.e. an more inward facing almost operational role), whereas a CTO should be outward facing looking and building technological advantage for the firm (i.e. a more outward facing commercial role).

However, I've seen it argued both ways. I'd be interested to hear what others think on the differences in the CIO and CTO roles.

Why would the Chief Investment Officer at a bank be involved in which technologies to adopt? Or did you mean Chief Information Officer or Chief Innovation Officer (which Wikipedia says exists, but I had never heard of)?