title: Relaxation time mapping of short T*2 nuclei with single-point imaging (SPI) methods.
abstract: New techniques for quantitative mapping of T1, T2, and T*2 are proposed, based on the single-point imaging (SPI) method, for materials with short nuclear magnetic resonance relaxation times which cannot be imaged with traditional methods. Relaxation times extracted from two-dimensional images of uniform doped agarose phantoms (T*2 approximately 60-210 microseconds) as well as hardened mortar (T*2 approximately 220 microseconds) and polymers (T*2 approximately 20-100 microseconds), using these techniques, agreed with bulk measurements. The method was then applied to a partially dried cylindrical concrete sample (T*2 approximately 115 microseconds).
authors.affiliation: Department of Physics, MRI Centre, University of New Brunswick, Fredericton, Canada.
authors.forename: S D
authors.initials: SD
authors.lastname: Beyea
authors.forename: B J
authors.initials: BJ
authors.lastname: Balcom
authors.forename: P J
authors.initials: PJ
authors.lastname: Prado
authors.forename: A R
authors.initials: AR
authors.lastname: Cross
authors.forename: C B
authors.initials: CB
authors.lastname: Kennedy
authors.forename: R L
authors.initials: RL
authors.lastname: Armstrong
authors.forename: T W
authors.initials: TW
authors.lastname: Bremner
mesh_terms: D007089:Image Enhancement; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D019047:Phantoms, Imaging; D012685:Sepharose / Q000737:chemistry
chemical_list: D012685:Sepharose