GRASE imaging at 3 Tesla with template interactive phase–encoding

✍ Scribed by Jorge Jovicich; David G. Norris

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 1016 KB
• Volume: 39
• Category: Article
• ISSN: 0740-3194
• DOI: 10.1002/mrm.1910390615

✦ Synopsis

Abstract

A new method for ordering the phase‐encoding gradient is proposed, and an application for short effective TE gradient‐and spin‐echo (GRASE) imaging is demonstrated. The proposed method calculates the phase‐encoding order from the signal decay of a template scan (hence “template interactive phase‐encoding” or TIPE). Computer simulations are used to compare the point spread functions of different phase‐encoding orders giving short effective echo times (kb centric GRASE, centric GRASE, centric TIPE). The conventional centric phase‐encoding order is also considered for GRASE. The conventional centric method is sensitive to both amplitude and phase modulation of the signal in K‐space. The centric TIPE method gives the least amplitude modulation artifacts but is vulnerable to phase artifacts. The TIPE experiment was implemented on a 3 Tesla system. To the best of our knowledge, we present the first in vivo GRASE images at this field strength.