Performance evaluation of whole-body NMR scanner antenna systems

✍ Scribed by George Sergiadis

• Book ID: 102526575
• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 340 KB
• Volume: 2
• Category: Article
• ISSN: 0740-3194
• DOI: 10.1002/mrm.1910020403

✦ Synopsis

Abstract

Whole‐body NMR imaging antennas (probes) are strongly affected by the inevitable magnetic and controllable dielectric losses. Using a convenient parallelepiped model, the magnetic losses are evaluated. By introducing the “ideal power gain,” the best possible antenna performance is delimited as a function of the frequency and the patient examined. By using a cylindrical model and introducing the “electrostatic quality factor” (EQF), the dielectric loss of any antenna can be estimated. With the help of the wideband field measurer described, a simple experimental arrangement, and the analysis developed, the performance of whole‐body NMR antennas can be compared and/or evaluated. An example is given for the application of this model at 6.4, 21, and 64 MHz for three typical patients.