Analysis of multiple T2 proton relaxation processes in human head and imaging on the basis of selective and assigned T2 values

✍ Scribed by K. Gersonde; L. Felsberg; T. Tolxdorff; D. Ratzel; B. Ströbel

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 988 KB
• Volume: 1
• Category: Article
• ISSN: 0740-3194
• DOI: 10.1002/mrm.1910010406

✦ Synopsis

Two-dimensional T2-selective proton imaging of human head has been performed at 10 MHz employing Cam-Purcell-Gill-Meiboom pulse lrains 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 T2 relaxation curve of each pixel of the image has been deconvoluted into up to three monoexponential functions which are defined by l/T2., and a, The T2., values are represented in a T2 histogram of the slice and then selected for generating images which relate to protons with specific T2. The a, values indicate the relative amounts of the Tz-selected protons. Imaging on the basis of a, values increases the contrast of the image. The multiple T2-selective imaging technique leads to head images which show selectively cerebrospinal fluid, gray matter, different types of white: matter, and nonassigned fastrelaxing proton classes.