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PURR‐TURBO: A novel pulse sequence for longitudinal relaxographic imaging
Author(s) -
Lee JingHuei
Publication year - 2000
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/(sici)1522-2594(200005)43:5<773::aid-mrm23>3.0.co;2-7
Subject(s) - computer science , snapshot (computer storage) , single shot , algorithm , pulse sequence , nuclear magnetic resonance , artificial intelligence , physics , optics , operating system
A novel pulse sequence based on a segmented phase‐encoding scheme for measuring the longitudinal relaxation time ( T 1 ) value of an NMR signal in an imaging context is introduced. This pulse sequence is a hybrid version of the “single‐shot” and “one‐shot” inversion recovery (IR) snapshot‐FLASH methods. These are also known as “multipoint” IR techniques. The new sequence presented here collects multiple k ‐space rows at each time point during magnetization recovery, rather than the entire dataset (as in a “single‐shot” method) or just one row (as in a “one‐shot” method). Thus, it reduces the scanning time without significant sacrifice of the small sampling time advantage of the one‐shot IR snapshot‐FLASH methods. Furthermore, this approach does not require a high‐performance gradient system. Here, we demonstrate that a single slice human brain 1 H 2 O T 1 map with a nominal in‐plane resolution of less than (1 mm)2can be obtained at 4 T in about 4 min. Magn Reson Med 43:773–777, 2000. Published 2000 Wiley‐Liss, Inc.