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Analysis of multiple T 2 proton relaxation processes in human head and imaging on the basis of selective and assigned T 2 values
Author(s) -
Gersonde K.,
Felsberg L.,
Tolxdorff T.,
Ratzel D.,
Ströbel B.
Publication year - 1984
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/mrm.1910010406
Subject(s) - nuclear magnetic resonance , proton , physics , relaxation (psychology) , pixel , exponential function , chemistry , optics , mathematics , mathematical analysis , nuclear physics , psychology , social psychology
Two‐dimensional T 2 ‐selective proton imaging of human head has been performed at 10 MHz employing Carr‐Purcell‐Gill‐Meiboom pulse trains with echo separation of 6 and 12 msec. Using the information of 36 spin echoes and applying a recovery time of 2 sec the magnetization decay has been traced. The multi‐exponential T 2 relaxation curve of each pixel of the image has been deconvoluted into up to three monoexponential functions which are defined by 1/T 2,i and α i . The T 2,i values are represented in a T 2 histogram of the slice and then selected for generating images which relate to protons with specific T 2 . The α i values indicate the relative amounts of the T 2 ‐selected protons. Imaging on the basis of α 2 values increases the contrast of the image. The multiple T 2 ‐selective imaging technique leads to head images which show selectively cerebrospinal fluid, gray matter, different types of white matter, and nonassigned fast‐relaxing proton classes.