System and SAR characterization in parallel RF transmission
نویسندگان
چکیده
منابع مشابه
Minimal-SAR RF Pulse Optimization in Parallel Transmission
INTRODUCTION Parallel transmission is an emerging technique that has great potential in many applications such as reducing selective RF pulse duration and improving B1 and B0 field inhomogeneity in high fields [1-3]. A potential issue in parallel transmission is elevated RF power deposition which is characterized by the specific absorption ratio (SAR). In parallel excitation, the effect of elec...
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Parallel transmission has gained considerable interest during the last few years [1,2]. The use of multiple individual RF transmit coils have been introduced to overcome B1 homogeneity limitations and to improve multi-dimensional RF pulses by shortening their duration. Of special concern in all these transmit applications is the specific absorption rate (SAR), which has to be kept below certain...
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From the beginning of 3.0T developments within Philips, the clinical value of high-field imaging has always been a driver in choosing the right technologies. With clear benefits of imaging at 3.0T (higher SNR and sensitivity for higher speed and resolution), the challenge has always been to optimize clinical utility whilst mastering fundamental high-field challenges. Unlike 1.5T, the most impor...
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The management of local and global power deposition in human subjects (specific absorption rate, SAR) is a fundamental constraint to the application of parallel transmission (pTx) systems. Even though the pTx and single channel have to meet the same SAR requirements, the complex behavior of the spatial distribution of local SAR for transmission arrays poses problems that are not encountered in ...
متن کاملIn Vivo RF Power and SAR Calibration for Multi-Port RF Transmission
Introduction: While a substantially increased degree of freedom inherent of parallel RF transmit facilitates excitation profile control, it meanwhile raises concerns that poorly guided multi-port RF pulse or shimming calculations, or multi-channel hardware failure may inadvertently elevate SAR. One can address the concerns to some extent by monitoring RF power at the ports, where power sensors ...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2011
ISSN: 0740-3194
DOI: 10.1002/mrm.23126