Accelerated MRI at 9.4 T with electronically modulated time-varying receive sensitivities.
B1− modulation
SENSE
coil sensitivities
parallel imaging
reconfigurable RF coil
ultra-high field
Journal
Magnetic resonance in medicine
ISSN: 1522-2594
Titre abrégé: Magn Reson Med
Pays: United States
ID NLM: 8505245
Informations de publication
Date de publication:
08 2022
08 2022
Historique:
revised:
19
01
2022
received:
09
11
2021
accepted:
04
03
2022
pubmed:
23
4
2022
medline:
24
6
2022
entrez:
22
4
2022
Statut:
ppublish
Résumé
To investigate how electronically modulated time-varying receive sensitivities can improve parallel imaging reconstruction at ultra-high field. Receive sensitivity modulation was achieved by introducing PIN diodes in the receive loops, which allow rapid switching of capacitances in both arms of each loop coil and by that alter B The g-factor calculations showed that fast modulation of receive sensitivities in the order of the ADC dwell time during k-space acquisition can improve parallel imaging performance, as this effectively makes spatial information of both configurations simultaneously available for image encoding. This was confirmed by in vivo measurements, for which lower reconstruction errors (SSIM = 0.81 for acceleration R = 4) and g-factors (max g = 2.4; R = 4) were observed for the case of rapidly switched sensitivities compared to conventional reconstruction with static sensitivities (SSIM = 0.74 and max g = 3.2; R = 4). As the method relies on the short RF wavelength at ultra-high field, it does not yield significant benefits at 3T and below. Time-varying receive sensitivities can be achieved by inserting PIN diodes in the receive loop coils, which allow modulation of B
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
742-756Informations de copyright
© 2022 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine.
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