Many MR artifacts are not understandable in terms of previous imaging experience. A variety of artifacts is presented here; their origins and elimination are discussed.
Since ancient times, there has been a tug-of-war taking place between code makers and code breakers. Only within the last fifty years have the code makers emerged victorious (for now that is) with the advent of public key cryptography. This paper surveys the mathematical foundations, shortcomings, and novel variants of the " first " public key cryp-tosystem… (More)