Deutsch
 
Benutzerhandbuch Datenschutzhinweis Impressum Kontakt
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT

Freigegeben

Vortrag

Optimization of the Transmit and Receive Performance of the Transceiver Head Phased Array for Human Brain Imaging at Ultra-High Fields

MPG-Autoren
/persons/resource/persons133464

Avdievich,  N
Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

Externe Ressourcen

Link
(beliebiger Volltext)

Volltexte (frei zugänglich)
Es sind keine frei zugänglichen Volltexte verfügbar
Ergänzendes Material (frei zugänglich)
Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar
Zitation

Avdievich, N. (2017). Optimization of the Transmit and Receive Performance of the Transceiver Head Phased Array for Human Brain Imaging at Ultra-High Fields. Talk presented at Workshop SWS04: Radiofrequency Coils for Magnetic Resonance Imaging at: 11th European Conference on Antennas and Propagation (EuCAP 2017). Paris, France.


Zitierlink: http://hdl.handle.net/21.11116/0000-0000-C5E8-C
Zusammenfassung
Commonly, for optimal MRI performance at low (<3T) magnetic fields, a local receive-only (Rx) RF phased array is used in combination with an integrated transmit-only (Tx) body RF volume coil. This technique is difficult to apply at ultra-high (>7T) magnetic fields (UHF) because large body coils are very inefficient at UHF, and cannot satisfy requirements in RF magnetic field, B1, anymore. To improve Tx-efficiency, B1/√P, and achieve a good Rx-performance, a local Transmit-Only volume coil (or Tx-array) in combination with a smaller tight-fit Receive-Only array, a ToRo coil, is used instead. Since most of the commercial UHF scanners provide only 8 kW of RF power, half of which is lost on a way to the coil, ToRo design still does not deliver sufficient B1. Tight-fit transceiver (TxRx) phased arrays improve Tx-efficiency in comparison to Tx-only arrays, which are larger to fit Rx-only arrays inside. However, the number of elements in a TxRx-array is restricted by the number of available RF Tx-channels (commonly <16) and difficulties associated with decoupling during transmission. In this work, we optimized the decoupling and developed new methods to increase the number of Rx-elements without compromising the Tx-performance. Thus, both the Tx- and Rx-performance of the TxRx-array can be optimized at same time.