title: Rapid radiofrequency calibration in MRI.
abstract: A collection of modified procedures for setting rf transmitter levels using a three-pulse sequence is described. Based on a geometrically weighted ratio of four signals, an estimate of the flip angle is calculated and used for an updating prescription. These techniques are designed to perform rapidly yet eschew systematic errors due to relaxation during the pulse sequence.
authors.affiliation: Radiologic Imaging Laboratory, University of California, San Francisco 94080.
authors.forename: J W
authors.initials: JW
authors.lastname: Carlson
authors.forename: D M
authors.initials: DM
authors.lastname: Kramer
mesh_terms: D000465:Algorithms; D002138:Calibration; D006801:Humans; D008279:Magnetic Resonance Imaging; D011846:Radio Waves