Finite Difference Time Domain (FDTD) Simulation of Receive-Only Array Inserts for 7T Transmit-Only Head Coil: Influence on Spin Excitation and Specific Absorption Rate (SAR)
نویسندگان
چکیده
During MR procedures majority of the radiofrequency (RF) power transmitted for imaging or spectroscopy is transformed into heat within the patient’s tissue as a result of resistive losses. In this work we evaluate the effect of a wide variety of receive-only insert geometry including cylinders and helmets with different trace widths on spin excitation field and SAR of a 7T TEM transmit coil.
منابع مشابه
Fast GPU FDTD Calculations: Towards Online SAR and B1+ Assessment and Control
Introduction: One of the main drawbacks of high field MRI is its inherent higher SAR deposition. To address this issue multiple channel RF transmit systems are under development which allow a higher level of control over the electromagnetic fields. Although the individual magnetic excitation fields (B1+) can be mapped, the accompanying electric fields per element cannot be measured. This inform...
متن کاملSpecific absorption rate studies of the parallel transmission of inner-volume excitations at 7T.
PURPOSE To investigate the behavior of whole-head and local specific absorption rate (SAR) as a function of trajectory acceleration factor and target excitation pattern due to the parallel transmission (pTX) of spatially tailored excitations at 7T. MATERIALS AND METHODS Finite-difference time domain (FDTD) simulations in a multitissue head model were used to obtain B(1) (+) and electric field...
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