The physics of MRI safety
LP Panych, B Madore - Journal of Magnetic Resonance …, 2018 - Wiley Online Library
The main risks associated with magnetic resonance imaging (MRI) have been extensively
reported and studied; for example, everyday objects may turn into projectiles, energy …
reported and studied; for example, everyday objects may turn into projectiles, energy …
Parallel transmission for ultrahigh‐field imaging
The development of MRI systems operating at or above 7 T has provided researchers with a
new window into the human body, yielding improved imaging speed, resolution and signal …
new window into the human body, yielding improved imaging speed, resolution and signal …
Local specific absorption rate (SAR), global SAR, transmitter power, and excitation accuracy trade‐offs in low flip‐angle parallel transmit pulse design
Purpose We propose a constrained optimization approach for designing parallel transmit
(pTx) pulses satisfying all regulatory and hardware limits. We study the trade‐offs between …
(pTx) pulses satisfying all regulatory and hardware limits. We study the trade‐offs between …
On variant strategies to solve the magnitude least squares optimization problem in parallel transmission pulse design and under strict SAR and power constraints
A Hoyos-Idrobo, P Weiss, A Massire… - IEEE transactions on …, 2013 - ieeexplore.ieee.org
Parallel transmission is a very promising candidate technology to mitigate the inevitable
radio-frequency (RF) field inhomogeneity in magnetic resonance imaging at ultra-high field …
radio-frequency (RF) field inhomogeneity in magnetic resonance imaging at ultra-high field …
An 8-channel Tx/Rx dipole array combined with 16 Rx loops for high-resolution functional cardiac imaging at 7 T
Objective To demonstrate imaging performance for cardiac MR imaging at 7 T using a coil
array of 8 transmit/receive dipole antennas and 16 receive loops. Materials and methods An …
array of 8 transmit/receive dipole antennas and 16 receive loops. Materials and methods An …
Specific absorption rate intersubject variability in 7T parallel transmit MRI of the head
Patient‐specific radiofrequency shimming in high‐field MRI strengthens the need for online,
patient‐specific specific absorption rate (SAR) monitoring. Numerical simulation is currently …
patient‐specific specific absorption rate (SAR) monitoring. Numerical simulation is currently …
A deep learning method for image‐based subject‐specific local SAR assessment
EF Meliadò, AJE Raaijmakers, A Sbrizzi… - Magnetic resonance …, 2020 - Wiley Online Library
Purpose Local specific absorption rate (SAR) cannot be measured and is usually evaluated
by offline numerical simulations using generic body models that of course will differ from the …
by offline numerical simulations using generic body models that of course will differ from the …
Comparison of simulated parallel transmit body arrays at 3 T using excitation uniformity, global SAR, local SAR, and power efficiency metrics
Purpose We compare the performance of eight parallel transmit (pTx) body arrays with up to
32 channels and a standard birdcage design. Excitation uniformity, local specific absorption …
32 channels and a standard birdcage design. Excitation uniformity, local specific absorption …
Intersubject local SAR variation for 7T prostate MR imaging with an eight‐channel single‐side adapted dipole antenna array
Ö Ipek, AJ Raaijmakers, JJ Lagendijk… - Magnetic resonance …, 2014 - Wiley Online Library
Purpose Surface transmit arrays used in ultra‐high field body MRI require local specific
absorption rate (SAR) assessment. As local SAR cannot be measured directly, local SAR is …
absorption rate (SAR) assessment. As local SAR cannot be measured directly, local SAR is …
Direct control of the temperature rise in parallel transmission by means of temperature virtual observation points: simulations at 10.5 Tesla
Purpose A method using parallel transmission to mitigate B1+ inhomogeneity while explicitly
constraining the temperature rise is reported and compared with a more traditional SAR …
constraining the temperature rise is reported and compared with a more traditional SAR …