2018/06/13 by Bernhard Gruber, Martijn Froeling, Tim Leiner +1 · 1 voice · 3 citations
Medicine · Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Advanced MRI Techniques and Applications #Electromagnetic Fields and Biological Effects #NMR spectroscopy and applications
paper · pdf · doi:10.1002/jmri.26187
openalex publication_date 2018/06/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
Radiofrequency (RF) coils are an essential MRI hardware component. They directly impact the spatial and temporal resolution, sensitivity, and uniformity in MRI. Advances in RF hardware have resulted in a variety of designs optimized for specific clinical applications. RF coils are the “antennas” of the MRI system and have two functions: first, to excite the magnetization by broadcasting the RF power (Tx‐Coil) and second to receive the signal from the excited spins (Rx‐Coil). Transmit RF Coils emit magnetic field pulses ( ) to rotate the net magnetization away from its alignment with the main magnetic field (B 0 ), resulting in a transverse precessing magnetization. Due to the precession around the static main magnetic field, the magnetic flux in the receive RF Coil ( ) changes, which generates a current I. This signal is “picked‐up” by an antenna and preamplified, usually mixed down to a lower frequency, digitized, and processed by a computer to finally reconstruct an image or a spectrum. Transmit and receive functionality can be combined in one RF Coil (Tx/Rx Coils). This review looks at the fundamental principles of an MRI RF coil from the perspective of clinicians and MR technicians and summarizes the current advances and developments in technology. Level of Evidence : 1 Technical Efficacy : Stage 6 J. Magn. Reson. Imaging 2018;48:590–604.