title: [Technical aspects of fast, ultra-fast MR imaging].
abstract: Technical aspects of fast, ultra-fast MR imaging are described. Firstly, mechanism of steady state MR signals, generated by rf pulses with short repetition times, are focused, and described that the steady state signal contains echo signals that have different history. Imaging pulse sequence utilizing the steady state signals is referred to as Gradient Recalled Echo (GRE) sequence. Secondly, in order to give general description for echo train imaging sequences, concept of k-space and k-space trajectory is introduced. The concept is useful to realize how echo train imaging sequences such as echo planar imaging and fast spin echo imaging collect raw data efficiently.
authors.affiliation: Advanced Technology Center, GE Yokogawa Medical Systems.
authors.forename: T
authors.initials: T
authors.lastname: Tsukamoto
mesh_terms: D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*