Imaging of the active B1 field in vivo

✍ Scribed by Rudolf Stollberger; Paul Wach

• Book ID: 102953651
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 635 KB
• Volume: 35
• Category: Article
• ISSN: 0740-3194
• DOI: 10.1002/mrm.1910350217

✦ Synopsis

Abstract

The authors describe a method for accurate In vivo muttislice imaging of the active component of the B~1~ field which is based on a previously proposed method, which uses the signal intensity ratio of two images measured with different excitation angles, and a repetition time TR≥ 5 T~1~ The new method essentially reduces repetition and scan time by means of an additional compensating pulse. The suppression of T~1~ effects by this pulse are verified with simulations and measurements. Further investigations concerned the influence of slice selective excitation and magnetization transfer in multislice imaging to the B~1~ field determination. The stability and accuracy of the presented method is shown by several phantom and in vivo measurements. With the described method the active B~1~ field can be determined in vivo in 23 cross‐sections in less than 6 min.