Abstract
Depending on the local IRB (Internal Regulation Board) regulations for safety reasons, homemade RF coil prototype assessment through an in vivo experiment can be painful and lengthy administrative process. It includes to document simulations and experimental validations on phantom before being able to proceed. The situation can be even worse, if for some reasons, once it has passed all the acceptance stages, the coil does not deliver as expected in vivo. The process to maybe then rebooted.
Highlights
Ultra-High-Field (UHF) Magnetic Resonance Imaging (MRI) scanners hold great promises for clinical and neuroscientific researches
The calculation of the relevant sequence parameters has been done based on the fact that the calibration of the reference pulse (REF), a 500us boxcar 90° pulse, would require the full power available at the port of the coil (e.g. 8x1kW for configuration we used) which is again very restrictive because the coil would be excessively inefficient in this situation
In Table, the sequences parameters are displayed with an estimation of the worst global and local Specific Absorption Ratio (SAR) possible while using the worst possible REF
Summary
Ultra-High-Field (UHF) Magnetic Resonance Imaging (MRI) scanners hold great promises for clinical and neuroscientific researches. RF coil technologies, at the state of the art, have had hard time to deliver all the expectations put in UHF. Parallel Transmission (pTx) is the dominant strategy to solve the issue, but such system holds some weaknesses including long calibration time and a relative inefficiency because of strong coupling between coils [1,2]. RF coil delivers energy inside human body to excite the nuclear spins that will be used to form an image.
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